Extension Party Wall Notice in Greenwich

Greenwich homeowners who engage with the local planning framework early — understanding conservation area boundaries, permitted development limits, and local design guides — consistently achieve better outcomes than those who treat planning as an afterthought.

Determining the correct planning route is the first practical step for any Greenwich project. The options are full planning permission, a householder planning application, permitted development (confirmed by a Lawful Development Certificate), or prior approval — and the right choice depends on the scope of work, the property, and any local constraints.

Permitted development rights allow many householder works in Greenwich to proceed without a planning application, but the scope of these rights depends on the property type, any existing extensions, and whether the site is in a conservation area or affected by an Article 4 direction. Confirming the position before work starts — ideally with a Lawful Development Certificate — avoids an expensive assumption.

The National Planning Policy Framework (NPPF) sets the overarching context for planning decisions in Greenwich, but the borough's own Local Plan and Supplementary Planning Documents add layers of local policy that London Borough of Greenwich officers apply when assessing each application. Understanding how national and local policy interact — and where London Borough of Greenwich has adopted stricter standards than the national default — is essential for preparing an application that is validated quickly and assessed favourably.

Pre-application engagement with London Borough of Greenwich is available for most householder proposals and is a service we recommend for any project where the planning route is not immediately clear. The feedback received at pre-application stage — typically a written response from a planning officer — allows the design to be refined before the formal application is submitted, reducing the likelihood of conditions, amendments, or outright refusal. For conservation area projects in Greenwich, pre-application advice is particularly valuable because it establishes the officer's expectations for materials, design character, and supporting documentation before significant design investment is committed.

While publicly available datasets for Greenwich conservation areas are still being compiled, the general principle applies: any proposal in or adjacent to a designated area must demonstrate how it relates to its setting. Contacting London Borough of Greenwich directly or requesting a pre-application meeting is the most reliable way to confirm constraints before design begins.

Conservation area designation does not prevent development — it requires that proposals demonstrate how they preserve or enhance the character and appearance of the area. Extensions, loft conversions, and other household works are regularly approved in conservation areas across Greenwich, provided the design, materials, and overall approach respond to the specific character that the designation seeks to protect. Our experience with conservation area applications in Greenwich means we know how to present proposals that satisfy the additional scrutiny without unnecessary cost or delay.

Article 4 directions are a tool available to London Borough of Greenwich to remove or restrict permitted development rights in areas where the unrestricted exercise of those rights would harm local character. Even where no Article 4 direction is currently in force, the general position for any Greenwich property should be verified before works proceed — directions can be introduced at any time, and the planning status of a site can change between the initial project consultation and the date construction begins.

Where permitted development rights are relied upon for a Greenwich project, a Lawful Development Certificate provides the most robust confirmation of the legal position. The LDC is assessed against the permitted development limits and any applicable restrictions as they stand at the date of the application. Once issued, the LDC provides permanent certainty — even if future policy changes would otherwise affect the position. We recommend LDCs for all projects where the permitted development status is not immediately clear.

Once the party wall notices are served, we manage the response process — handling consents, appointing surveyors where neighbours dissent, and preparing party wall awards where needed — so the construction programme stays on track.

In Greenwich, rear and side extensions frequently trigger adjacent excavation notices where new foundations are dug within three or six metres of neighbouring foundations. Our notices clearly describe the proposed excavation depths and foundation design.

Our extension party wall notice service for Greenwich homeowners covers all extension types: single-storey rear extensions, two-storey rear extensions, side returns, wraparound extensions, and basement excavations. Each type carries different party wall obligations depending on proximity to the boundary.

Extension party wall notices for Greenwich properties address the works that affect shared boundaries and neighbouring foundations — new foundations near the party wall, excavation within prescribed distances, and any works to the party wall structure itself.

For homeowners in Greenwich who are at the early stage of considering a project — before a brief has been fully defined or a builder appointed — our initial consultation provides a practical framework for understanding the options, the likely planning route, the approximate cost envelope, and the programme from instruction to construction start. This conversation is free, carries no obligation, and can be conducted by telephone or video call at a time convenient to the client.

The process for a Greenwich planning application follows a standard sequence: pre-application research and constraint check; design and drawing preparation; submission to London Borough of Greenwich; validation and registration; officer assessment; decision. Most householder applications are determined within eight weeks of registration.

All projects in Greenwich begin with a free consultation call where we discuss the brief, the property, and the likely planning route. We then issue a detailed fixed-fee proposal before any survey or design work begins, so there are no surprises on costs.

The measured survey is carried out by our survey team and typically takes two to four hours for a standard terraced or semi-detached property in Greenwich. We measure all relevant internal and external dimensions, ceiling heights, window and door positions, roof structure access points, drainage positions, and boundary features. The survey is translated into accurate AutoCAD drawings that form the base for all design work — a solid survey prevents costly errors later in the project.

Once design options have been agreed and the planning party wall process is prepared, we submit the application to London Borough of Greenwich via the Planning Portal, ensuring all validation requirements are met first time. During the eight-week assessment period, we monitor the application, respond to any requests for information from the case officer, and liaise with neighbours or other consultees as needed. After permission is granted, we can move directly into the building regulation and construction-issue drawing stages without delay.

• Free initial consultation and brief assessment
• Fixed-fee proposal covering all agreed services
• Measured survey of the existing property
• Design options and client review
• Planning drawing preparation and internal QA check
• Submission to London Borough of Greenwich via Planning Portal
• Validation monitoring and officer liaison
• Application management through assessment period
• Post-consent building regulation package preparation
• Structural engineering coordination and calculations
• Construction-issue drawings for the building contractor
• Party wall surveyor introduction where required

Crown Party Wall Surveyors has worked across all 32 London boroughs including Greenwich. Our experience with London Borough of Greenwich's planning requirements, validation standards, and officer expectations means we can prepare applications that progress efficiently and with a high first-time approval rate.

We are a full-service practice — architecture, party wall dispute resolution, and planning consultancy under one roof. For Greenwich projects, this means the party wall notices, party wall awards, and building regulation package are all coordinated by the same team rather than produced by separate consultants whose information does not align.

The practical benefit of a single-practice approach is coordination. When the architect, the structural engineer, and the planning consultant are working from the same base drawing and communicating within the same office, the risk of conflicting information reaching the planning authority, building control, or the building contractor is eliminated. For Greenwich projects where conservation area constraints or complex structural interventions are involved, this coordination is not merely convenient — it is the difference between a smooth project and one that stalls at each handover point.

Our fee model is fixed-price, not hourly. We agree the scope and the fee in writing before any work begins, and the fee does not change unless the client changes the brief. This gives Greenwich homeowners certainty on professional costs from the outset, which is especially important when budgeting for a project where build costs, council fees, and professional fees all need to be understood as a total before committing.

Our registered office is at 71–75 Shelton Street, London WC2H 9JQ (company number 16297850). We are contactable at +44 7950 114633 and cover all projects across London and the home counties, including all areas of Greenwich.

Greenwich is a south-east London borough with strong maritime heritage, significant World Heritage Site designations around Greenwich Park, and a mix of historic and contemporary housing. This character shapes what planning applications are likely to succeed and how they need to be presented to London Borough of Greenwich. A design approach that works well in one part of Greenwich may be entirely wrong for another — which is why a borough-level understanding of the planning landscape, not a generic London template, is the starting point for every project we undertake here.

The residential stock in Greenwich consists principally of Georgian and Victorian terraces in the historic core, inter-war and post-war estates on the peninsula, and contemporary new-build developments in Woolwich and Charlton. Understanding how the existing building type responds to extension or alteration is the starting point for any design brief — it defines the structural approach, the planning sensitivities, and the opportunities for the project. Victorian terraces, for example, respond differently to rear extensions than inter-war semis; roof structures vary, party wall implications differ, and the planning precedent for each property type in each part of the borough is distinct.

Key areas within Greenwich where we regularly work include Greenwich, Woolwich, Eltham, Charlton, Plumstead, Blackheath. Each of these areas has its own micro-character, planning history, and in some cases specific conservation area or Article 4 designations that affect what is achievable on any given street. Our approach is to read the specific site rather than apply a borough-wide assumption — two streets in the same part of Greenwich can have entirely different planning constraints depending on whether one falls within a conservation area boundary and the other does not.

The materials and construction methods common to Greenwich's housing stock also influence the design. Where yellow London stock brick predominates, extensions are expected to match or complement that palette; where rendered or pebble-dashed finishes are common, the approach is different. We specify materials in the party wall notices that respond to the immediate context, and we justify those choices in any supporting design statement or heritage document that accompanies the application.

Extension party wall notices for Greenwich homes cover the specific boundary and foundation works that trigger obligations under the Party Wall etc. Act 1996. Our service coordinates the notice process with the construction programme so that party wall clearance does not delay the build.

For Greenwich homeowners planning extensions that involve excavation near neighbouring foundations, we prepare adjacent excavation notices with clear foundation drawings and method statements that demonstrate the proposed approach is safe and compliant.

For Greenwich clients who have received quotes from multiple practices and are comparing services, we encourage direct conversation rather than price-only comparison. Our fee proposals detail exactly what is included — drawing types, submission management, officer liaison, revision rounds — so the scope can be compared like-for-like. A lower headline fee that excludes building regulations, structural coordination, or officer liaison may not represent the best value once the full project cost is accounted for.

We also support Greenwich homeowners who have already started a project with another practice and need to change provider. Whether the original drawings need to be completed, a planning refusal needs to be addressed, or a fresh approach is needed for a re-submission, we can pick up from the existing position and move the project forward without requiring the client to start again from scratch.

London Borough of Greenwich assesses the impact of proposed extensions and conversions on neighbouring properties as a central part of every householder planning application in Greenwich. The main amenity considerations are: loss of daylight (measured by the 45-degree rule or BRE daylight/sunlight assessment), loss of outlook (whether the extension creates a sense of enclosure for adjacent habitable rooms), and loss of privacy (whether new windows or elevated areas create overlooking of neighbouring gardens or rooms).

Our design approach for Greenwich projects anticipates these amenity concerns at the sketch stage, before the drawings are finalised. By considering the position and height of the extension relative to neighbouring windows, fences, and garden areas from the outset, we can design a scheme that achieves the client's objectives while minimising the grounds on which neighbours or planning officers might object. Where a neighbour concern is likely, we address it explicitly in the party wall notices — for example, by specifying obscure glazing for side-facing windows or by stepping the extension away from the boundary at upper levels.

Neighbour notification is a standard part of the planning application process in Greenwich. London Borough of Greenwich sends notification letters to adjacent property owners and occupiers, giving them 21 days to submit comments. Objections do not automatically prevent approval, but they require the case officer to assess the specific issues raised and to weigh them against the planning merits of the proposal. A well-designed scheme with a clear planning justification typically survives neighbour objection; a poorly prepared application is more vulnerable. Our approach is to design for approval from the start, not to submit and hope for the best.

Building regulations apply to most construction works in Greenwich regardless of planning permission status. Extensions, loft conversions, structural alterations, and changes to drainage or electrics all require compliance with the relevant Parts of the Building Regulations, verified by London Borough of Greenwich building control or a registered building control approver.

Building regulations apply to most construction works in Greenwich regardless of planning permission status. Extensions, loft conversions, structural alterations, and changes to drainage or electrics all require compliance with the relevant Parts of the Building Regulations, verified by London Borough of Greenwich building control or a registered building control approver.

Building regulation approval in Greenwich runs in parallel to planning consent — they are two separate legal processes. We manage both for clients who wish to use Crown Party Wall Surveyors for the full project, or we can work alongside a client's own building contractor or structural engineer where preferred.

The schedule of condition package for Greenwich projects addresses all relevant Approved Documents: Part A (structure), Part B (fire safety), Part C (site preparation and resistance to moisture), Part F (ventilation), Part L (conservation of fuel and power), and Part M (access). For loft conversions, fire safety requirements under Part B are particularly significant — the conversion of a two-storey house to three storeys triggers specific escape route and alarm requirements that must be designed into the scheme from the outset. We integrate these requirements into the building regulation package so they are resolved before work begins on site.

• Full-plans applications for comprehensive pre-start approval
• Structural specification coordinated with engineering calculations
• Thermal performance and U-value calculations for Part L compliance
• Fire safety strategy for loft conversions and multi-storey works
• Drainage and below-ground works specification
• Ventilation strategy for new and altered habitable rooms

Extensions in Greenwich frequently involve removing internal walls to create larger kitchen-living spaces. Where a wall is load-bearing — supporting the floor above, the roof, or both — a structural engineer sizes the replacement beam and specifies the padstones, connections, and any additional support required. We coordinate this structural input with the building regulation package to ensure the specification is complete before the contractor starts on site.

Structural engineering for residential projects in Greenwich covers a range of interventions: removing load-bearing walls to create open-plan layouts, sizing steel beams to support loft conversions, designing foundations for extensions on London's variable clay subsoils, and specifying the temporary works required to carry out demolition safely. We integrate all structural work with the party wall surveyor services so contractors receive a single coordinated package.

For Greenwich projects that involve party wall works — including loft conversions where new beams bear on shared walls and rear extensions built up to or on a boundary — we coordinate the structural design so that party wall notices can be served with accurate specification. This reduces the scope for party wall disputes and keeps the construction programme on track.

Structural appraisal reports are also available for Greenwich homeowners who are purchasing a property and want an independent assessment of the building's structural condition before exchange, or who have noticed cracking, movement, or other symptoms that may indicate a structural issue. These reports are prepared by our structural engineers and provide a clear diagnosis and recommended course of action.

All party wall awards for Greenwich projects are prepared by qualified structural engineers and submitted as part of the building regulation package. The calculations cover the specific loading conditions of the property — dead loads from existing construction, imposed loads from the proposed use, wind loads, and any asymmetric or point loads from new structural elements. Where steelwork is specified, we include connection details, bearing pad specification, and fire protection requirements as applicable.

• Steel beam and column sizing for load-bearing wall removals
• Roof structure assessment and modification for loft conversions
• Foundation design for extensions on variable or clay subsoils
• Structural appraisal reports for existing buildings
• Temporary works specification for demolition and alteration sequences
• Connection and bearing details for steelwork in party wall settings
• Reinforced concrete design for basements and underpinning
• Timber engineering for roof trusses and floor joists

Every party wall process we prepare for Greenwich projects is a complete, coordinated set of documents — not a loose collection of individual drawings. The package is structured so that London Borough of Greenwich, building control, contractors, and mortgage lenders can each find the information they need without ambiguity or cross-referencing errors.

Each drawing is titled, numbered, and revision-controlled so that London Borough of Greenwich validation officers, building control inspectors, and on-site contractors are all working from the same version. When amendments are required — whether in response to officer feedback, client design changes, or structural modifications — we issue a formal revision with a clear cloud marking showing what has changed, not a loose replacement sheet.

Our party wall processs for Greenwich projects are prepared in AutoCAD and issued as high-resolution PDFs, each sheet scaled and dimensioned for A1 or A3 printing. Where required by a contractor or a building control inspector, we can also issue native DWG files. All drawings carry a consistent title block with the project name, drawing number, revision history, scale, and our company details.

For Greenwich projects in conservation areas, the party wall process is supplemented by a Design and Access Statement that explains the design rationale, the material choices, and how the proposal preserves or enhances the character and appearance of the designated area. Where listed buildings are affected, a Heritage Impact Assessment replaces or supplements the DAS. These documents are prepared by our team as part of the party wall process, not outsourced or left to the client to commission separately.

All drawings carry a consistent title block with the project name, address, drawing number, revision history, scale, and Crown Party Wall Surveyors' company details. When amendments are issued — whether at the client's request, in response to officer comments, or to incorporate structural revisions — the revision is clearly marked with a cloud and a revision note, so all parties can identify exactly what has changed without comparing entire drawing sets. This version control discipline prevents the confusion that arises when multiple unmarked versions of a drawing are in circulation.

• OS-based site location plan at 1:1250 with property boundary marked in red
• Block plan at 1:500 showing the site in relation to adjacent properties
• Existing floor plans and elevations at 1:50 or 1:100
• Proposed floor plans and elevations at 1:50 or 1:100
• Sections through the building showing existing and proposed construction
• Roof plan where the roof form is altered (loft conversions, dormers, rooflights)
• Structural specification sheets where structural works are proposed
• Design and access statement (where required for conservation areas)
• Heritage impact assessment (where listed buildings are affected)
• Window and door schedules with material and ironmongery specification

For Greenwich projects on a tight construction programme — for example, where a builder has been booked for a specific start date — we can accelerate the drawing preparation and submission stages. We flag any conservation area or pre-application requirement that might extend the programme, so realistic expectations are set from the start.

For Greenwich homeowners working to a construction programme, we can compress the design and submission stages where the brief is straightforward and the site visit can be scheduled promptly. Conversely, projects in sensitive locations — conservation areas, adjacent to listed buildings, or on sites with complex planning histories — benefit from a more deliberate pace with pre-application discussion before formal submission.

The eight-week determination period set by London Borough of Greenwich for householder applications is a statutory target, not a guarantee. In practice, most straightforward applications are determined within this window, but applications that generate significant neighbour comment, require additional information, or are referred to a planning committee can take longer. We monitor all applications through the assessment period and flag any delays or requests for additional information as soon as they arise, so the client is never surprised by a timeline change.

After planning permission is granted, the building regulation package is typically prepared within two to four weeks — faster if the structural design has been developed concurrently with the party wall notices. Building control approval from London Borough of Greenwich or an approved inspector usually follows within five weeks of submission. The total programme from first contact to approved schedules of condition is therefore typically twenty to twenty-four weeks for a standard Greenwich extension or loft conversion project.

• Week 1: Free initial consultation and project scoping
• Week 2: Measured survey of the existing property
• Weeks 3–4: Design options and client review meetings
• Weeks 4–5: Planning drawing preparation and internal QA
• Week 6: Submission to London Borough of Greenwich
• Weeks 6–14: Application assessment period (eight-week target)
• Weeks 14–16: Post-consent building regulation package preparation
• Week 16+: Construction-issue drawings and contractor briefing

We provide fixed-fee proposals for all Greenwich projects, covering each stage of the work from initial consultation through to construction-issue drawings. Our fees depend on the scope of the project — the number of drawings required, whether conservation area or listed building constraints apply, the structural complexity, and whether a pre-application discussion with London Borough of Greenwich is advisable. We provide the fee proposal in writing before any chargeable work begins.

Our fees for Greenwich projects are structured to reflect the actual scope of the work rather than a percentage of construction cost. This means the fee is the same whether the builder quotes £40,000 or £80,000 — our scope is defined by the drawings, submissions, and coordination we provide, not by the build cost. All fees are agreed in writing before any work begins.

Council application fees are separate from our professional fees and are paid directly to London Borough of Greenwich at the time of submission. We include these costs in our initial project cost breakdown so that the total investment is clear from the outset. We do not charge uplift or administration fees on council application costs.

For Greenwich homeowners who want a rough indication of costs before the initial consultation, the table below provides typical fee ranges for common project types. These are indicative only — the actual fee depends on the specific property, constraints, and scope of services required, and is confirmed in the written fee proposal issued after our initial conversation.

• Single-storey rear extension — planning and building regulations: £2,500–£4,500
• Two-storey rear extension — planning and building regulations: £3,500–£6,000
• Loft conversion (dormer) — planning and building regulations: £3,000–£5,500
• Loft conversion (mansard) — planning and building regulations: £4,000–£7,000
• Side return extension — planning and building regulations: £2,500–£4,000
• Full house refurbishment — design and regulatory package: £5,000–£9,000
• Lawful Development Certificate application: £800–£1,500
• Pre-application submission and response management: £600–£1,200

Before the first consultation call, Greenwich homeowners can prepare a few key pieces of information that accelerate the design process and help us provide an accurate fee proposal. None of these are essential before the first conversation — we can work through them together — but having them ready saves time and avoids back-and-forth.

If you have existing drawings of the property — from a previous extension, a loft conversion, or the original plans held by London Borough of Greenwich's building control archive — these are useful even if they are out of date. They give our surveyors a head start on the measured survey and reduce the risk of missed dimensions. Historic planning applications are also worth mentioning, as they form part of the property's planning history that London Borough of Greenwich will reference.

Photographs of the property are the single most useful piece of preparation. Clear photos of the front elevation, the rear elevation, both side elevations (if accessible), the rear garden including boundary fences and any existing outbuildings, and the interior spaces that would be affected by the proposed works allow us to form an initial view of the project before the consultation call. Smartphone photos are perfectly adequate — professional photography is not required.

If you have already spoken to a builder, received a quote for construction works, or have a preferred contractor in mind, it is helpful to mention this during the consultation. Understanding the build budget helps us calibrate the design to what is practical and avoids a situation where the drawings describe a scheme that is substantially above or below the client's price range for construction.

For Greenwich projects where the property is leasehold — common in flats, maisonettes, and some houses on managed estates — check whether your lease contains any restrictions on external alterations, structural changes, or change of use. Many leases require freeholder consent before works can begin, and some have specific requirements about materials, colours, or building method. We can advise on the planning and building regulation position, but lease consent is a separate matter that the homeowner should address with their freeholder or managing agent in parallel.

• Photos of the property: front, rear, side elevations, and garden/boundary
• A sketch or description of what you want to achieve
• Any existing drawings of the property (even older or approximate ones)
• Details of any previous planning applications or building control approvals
• Your approximate budget and preferred programme for the works
• Details of any known constraints: conservation area, listed building, shared access
• Title plan or Land Registry plan if available
• Contact details for any other professionals already engaged (builder, surveyor)
• Lease or freeholder details if the property is leasehold
• Any relevant correspondence with neighbours about the proposed works

While this page focuses on extension party wall notice in Greenwich, Crown Party Wall Surveyors works across all 32 London boroughs and the surrounding home counties. We regularly handle projects in neighbouring boroughs including Barking and Dagenham, Barnet, Bexley, Brent, and further afield in Bromley and Camden.

Each borough has its own planning authority, local plan, conservation area designations, and officer expectations. Our practice is structured so that borough-specific knowledge — validation requirements, officer preferences, appeal track record, and emerging policy positions — is maintained and applied consistently. A proposal in Greenwich is prepared for London Borough of Greenwich; a proposal in a neighbouring borough is prepared for that borough's authority, using the same quality framework but adapted to local conditions.

For clients with properties in multiple boroughs or projects that span a borough boundary, we coordinate the planning submissions so that both authorities receive consistent information and neither application contradicts the other. We have experience of projects that straddle boundaries in Greenwich and surrounding areas.

Beyond the M25, we provide the same standard of service for projects in the home counties — Surrey, Kent, Essex, Hertfordshire, Buckinghamshire, Berkshire, and Sussex. The planning framework in these areas is similar in principle but different in detail — each district council has its own local plan, and many rural areas have landscape, Green Belt, or AONB constraints that do not apply in London. We adapt our approach to the specific authority and its local policies, drawing on the same quality framework and professional rigour that we apply to London borough projects.

For clients relocating within London or considering investment properties across multiple boroughs, our multi-borough experience is a practical advantage. Rather than briefing a new practice for each property, clients can work with a single team that already understands the planning landscape in every London borough and can switch between Greenwich policy and any other borough's policy without a learning curve. This saves time, reduces duplication, and ensures consistency across a portfolio of projects.

Permitted development rights under the Town and Country Planning (General Permitted Development) Order 2015 (as amended) allow many household alterations and extensions in Greenwich to proceed without a planning application. The scope of these rights depends on the property type (detached, semi-detached, terraced, flat), the existing building's history of previous extensions, and whether any constraints — conservation area designation, Article 4 directions, listed building status — restrict or remove those rights.

For single-storey rear extensions in Greenwich, the permitted development limits allow up to four metres projection from the rear wall for attached houses and up to eight metres for detached houses under the prior approval notification scheme. These limits apply to the overall extension depth, including any existing rear extension. The extension must not exceed four metres in height, must not extend beyond the rear wall of the original house by more than half the width of the original house, and must be constructed in materials that match or are similar in appearance to the existing building.

Loft conversions in Greenwich may also fall within permitted development, provided the additional roof space created does not exceed 40 cubic metres for terraced houses or 50 cubic metres for detached and semi-detached houses. The conversion must not raise the existing ridge height, must not extend beyond the plane of the existing roof slope facing a highway, and must use materials that match the existing roof. In conservation areas, permitted development rights for roof alterations are significantly restricted — rear dormers may require planning permission, and any side-facing dormer windows are not permitted development.

A Lawful Development Certificate (LDC) from London Borough of Greenwich provides formal confirmation that a proposed development falls within permitted development and does not require planning permission. We recommend an LDC for any Greenwich project where the permitted development status is not completely clear — particularly for properties that have been previously extended, properties in or near conservation areas, and properties where the original building has been altered in ways that affect the permitted development calculation. The LDC is also a valuable document for future property sales, as it provides certainty to buyers and mortgage lenders that the works were carried out lawfully.

The most common residential project types in Greenwich reflect the borough's housing stock and the aspirations of its homeowners. Rear extensions — both single-storey and two-storey — are the most frequently requested service, driven by the desire for larger kitchen-living-dining spaces that connect to the garden. Side return extensions are particularly common in areas with Victorian and Edwardian terraced housing, where the narrow side passage offers an opportunity to widen the ground floor without affecting the rear garden.

Loft conversions are the second most common project type in Greenwich. For terraced and semi-detached houses, a loft conversion is often the most cost-effective way to add a bedroom and bathroom without losing garden space. The conversion type — rooflight-only, rear dormer, hip-to-gable, or mansard — depends on the existing roof form, the conservation area status, and the headroom available. Each type has different planning implications, structural requirements, and cost profiles, and we advise on the best approach for each specific property.

Garage conversions, internal reconfigurations, and whole-house refurbishments are also common in Greenwich. Garage conversions are popular in areas where off-street parking is less of a concern and the existing garage space can be better used as a habitable room. Internal reconfigurations — removing walls, repositioning kitchens or bathrooms, adding en-suites — often do not require planning permission but always require building regulation approval where structural or drainage changes are involved.

For more ambitious projects in Greenwich — basement extensions, new-build houses in rear gardens, subdivision of larger houses into flats — the planning and regulatory requirements are more complex and the pre-application engagement with London Borough of Greenwich is correspondingly more important. We handle these larger projects regularly and can advise on feasibility, programme, and likely costs before the client commits to detailed design work.

Garden rooms, outbuildings, and ancillary structures are an increasingly popular project type in Greenwich. Under permitted development, a detached outbuilding can be constructed in the curtilage of a dwellinghouse provided it meets the dimensional limits (single storey, maximum 2.5 metres eaves height near a boundary, no more than 50% of the garden covered) and is used for purposes incidental to the enjoyment of the dwelling. Where the intended use is as a habitable room — a home office, gym, or guest bedroom — building regulation requirements for insulation, fire safety, and electrical compliance apply. We advise on both the planning and building regulation route for all outbuilding projects.

Planning permission from London Borough of Greenwich is the first of several approvals needed before construction can start on a Greenwich project. After the planning decision notice is issued, the following steps are typically required: discharge of any pre-commencement planning conditions; building regulation submission and approval; party wall notices (if applicable); and preparation of construction-issue drawings for the building contractor.

Pre-commencement conditions are requirements attached to the planning permission that must be formally approved by London Borough of Greenwich before any work begins on site. Common pre-commencement conditions include submission of material samples, details of boundary treatment, landscaping plans, and construction management plans. We prepare the condition discharge applications and submit them to London Borough of Greenwich on the client's behalf — this is included in our standard service.

Building regulation drawings are typically prepared concurrently with the planning application or immediately after planning permission is granted. The building regulation package is more detailed than the party wall notices — it includes structural specification, thermal calculations, fire safety strategy, drainage details, and ventilation design. We submit the package to London Borough of Greenwich building control or an approved inspector and manage the approval process through to the Initial Notice or Plans Approval.

Construction-issue drawings are the final stage of the drawing process. These drawings carry the level of detail needed by the building contractor: specification notes, fixing details, schedules of windows, doors, and ironmongery, drainage fall calculations, and material finishes. We issue these drawings as a coordinated set, checked against the planning permission and building regulation approval, so the contractor has a single source of approved information for the build.

Extensions in Greenwich frequently affect existing drainage — particularly rear extensions that build over or near existing drain runs, manholes, or inspection chambers. Where an extension is built over or within three metres of a public sewer, a build-over agreement with Thames Water is required before construction can begin. Our schedules of condition address drainage routing, inspection chamber repositioning, and connection details so that the build-over agreement can be obtained efficiently.

For properties in Greenwich where the existing drainage discharges to a combined sewer (carrying both foul and surface water), any new surface water drainage from an extension roof may need to be attenuated or discharged separately under Sustainable Drainage Systems (SuDS) requirements. London Borough of Greenwich may also impose planning conditions relating to surface water drainage — particularly for larger extensions or where the site has a history of localised flooding. We incorporate drainage strategy into the building regulation package from the outset, so these requirements are addressed before the contractor begins excavation.

Planning application fees in Greenwich are set nationally by the Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) Regulations 2012 (as amended). The fee for a householder planning application — covering extensions, loft conversions, outbuildings, and alterations — is currently £258. This fee is paid to London Borough of Greenwich at the time of submission and is non-refundable regardless of the outcome.

Listed building consent applications are free of charge, although the associated planning application (if required separately) attracts the standard fee. Lawful Development Certificate applications are charged at half the full application fee (currently £129 for householder proposals). Pre-application advice fees are set by London Borough of Greenwich individually and vary depending on the scale of the proposal — householder pre-application fees in Greenwich typically range from £150 to £400 depending on the complexity of the enquiry.

Building regulation fees in Greenwich are separate from planning fees and are charged by London Borough of Greenwich building control or the appointed approved inspector. Fees are based on the estimated cost of works and are typically split into a Plan Charge (payable on submission) and an Inspection Charge (payable on the first inspection). For a typical £50,000–£80,000 extension, the combined building regulation fee is usually between £900 and £1,500. We include all council fees in our initial project cost breakdown so the total outlay is transparent from the start.

Discharge of planning conditions — where London Borough of Greenwich has attached conditions to a planning permission that require formal approval before or during construction — attracts a fee of £43 per request for householder applications. We handle condition discharge submissions as part of our standard service and include the fee in the project cost summary. Party wall surveyor fees, structural engineer fees, and construction costs are all additional to the professional and council fees described above — we can provide approximate ranges for all of these during the initial consultation.

All extensions and major alterations in Greenwich must comply with Part L of the Building Regulations, which sets minimum standards for thermal performance, energy efficiency, and carbon emissions. The requirements have been significantly strengthened in recent years, with the 2021 and 2023 updates to Part L raising the minimum U-value standards for walls, roofs, floors, and glazing. Our schedules of condition incorporate thermal calculations that demonstrate compliance with these requirements.

For extensions in Greenwich, the Part L requirements mean that new walls must achieve U-values of 0.28 W/m²K or better, new roofs must achieve 0.16 W/m²K or better, and new floors must achieve 0.22 W/m²K or better. Windows and doors must achieve overall U-values of 1.6 W/m²K or better. These standards are achievable with standard construction methods — full-fill cavity insulation, rigid insulation boards, and double or triple-glazed windows — but the specification must be included in the schedules of condition and verified by the building control inspector.

Where an extension or conversion exceeds 25% of the total floor area of the existing dwelling, a whole-building assessment may be required under Part L, taking into account the energy performance of the existing building as well as the new work. This can trigger consequential improvements — such as upgrading the existing boiler, adding loft insulation to the original roof, or replacing single-glazed windows in the existing building — as part of the overall building regulation compliance. We advise Greenwich homeowners on these implications early in the design process, so the cost and scope of any consequential improvements are understood before the project proceeds.

Ventilation requirements under Part F also affect extensions and conversions in Greenwich. New habitable rooms require background ventilation (trickle vents in windows), rapid ventilation (opening windows), and, in some cases, mechanical extract ventilation. Kitchens, bathrooms, and utility rooms require mechanical extract — either through intermittent fans or a whole-house mechanical ventilation system. Our schedules of condition specify the ventilation strategy for each new and altered room, ensuring compliance without over-engineering the solution.

Crown Party Wall Surveyors is a London-based practice registered at Companies House under company number 16297850. Our registered address is 71–75 Shelton Street, London WC2H 9JQ. We specialise in residential architecture, party wall dispute resolution, planning consultancy, and building regulation compliance for homeowner projects across London and the home counties.

Our service model combines architectural design, party wall dispute resolution, and planning consultancy under one roof. For Greenwich homeowners, this means a single point of contact who coordinates the design, the planning application, the building regulation submission, and the structural specification — rather than three separate consultants working from different information at different speeds.

We carry professional indemnity insurance and public liability insurance appropriate to the scale of projects we undertake. Our fee proposals are fixed-price and issued in writing before any work begins. We do not charge for the initial consultation call, and we do not charge upfront deposits — our first invoice is raised only when the measured survey has been completed and the design work is underway.

Our team includes qualified architects, architectural technologists, structural engineers, and planning consultants. For Greenwich projects, we assign a lead consultant who manages the project from initial brief through to construction-issue drawings, with specialist input from the party wall dispute resolution and planning teams as required. This continuity means the lead consultant understands the full history and context of the project at every stage — reducing the risk of miscommunication, lost information, or inconsistent design decisions that arise when a project passes between multiple contacts.

We maintain an archive of all project drawings, correspondence, and submissions for every Greenwich project we undertake. If a client needs copies of historic drawings — for a future alteration, a property sale, or a dispute with a neighbour or contractor — we can retrieve and reissue the relevant documents. This record-keeping service is included as standard and reflects our commitment to long-term client relationships rather than one-off transactional work.

To discuss a project in Greenwich or request a free initial consultation, contact Crown Party Wall Surveyors at +44 7950 114633 or through the enquiry form on this page. We aim to respond to all new enquiries within one working day.