House
extensions
in Putney, SW15
Architects, Engineers, Surveyors & Builders Under One Roof.
One Studio. One Contract. One Team.
RICS surveying support for party walls, licence to alter, conservation-area works & neighbour mattersWe design and build Putney house extensions across Putney's principal residential streets - side-return, rear, wraparound and double-storey additions for Victorian villas, Edwardian terraces and Riverside Mansion Blocks where planning strategy, conservation detailing, Party Wall sequencing and structural engineering need handling properly.
House Extensions in Putney: What You Need to Know
Every house extension project in Putney is designed to respect the Putney Conservation Area and the character of Victorian villas, Edwardian terraces, riverside mansion blocks. Our in-house RIBA Chartered Architects handle Wandsworth planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Putney has conservation area coverage in parts, so some properties will need planning permission for external changes while others may proceed under permitted development. We assess each property individually.
Our house extension projects in Putney are delivered by our in-house team of RIBA architects, structural engineers and specialist tradespeople. Every project is managed under a single fixed-price contract with no hidden costs.
Two Putneys meet in the extension drawings. On Putney Hill, grand Victorian villas and mansion blocks reward ambitious whole-house schemes; on Disraeli Road and the grid off the Lower Richmond Road, long Edwardian and Victorian family terraces call for the classic pairing of side return below and loft above. The riverside adds a third strand — flats and conversions around Putney High Street where any extension thinking runs through the freeholder first.
What unites them is selectivity. SW15 extension work concentrates on the houses where a rear garden, a workable side return and sound structure genuinely allow more family space, rather than forcing area onto plots that cannot take it. The terraces off the Lower Richmond Road are the reliable hosts — family houses that take lofts and rear extensions in their stride.
Putney sits in the London Borough of Wandsworth, and conservation areas protect its best streets between the river and the heath, so external design is judged against that setting. Cost, meanwhile, turns on the fabric: villa or terrace structure, party walls, drainage and rear levels, tree and boundary constraints, glazing specification and the access between established SW15 streets and their gardens.
House Extensions in Putney: Applied to the Local Stock
Putney sits in the London Borough of Wandsworth, with conservation areas protecting its best streets between the river and the heath. London-wide cost band for rear extension — single storey: £71,250–£112,500 excluding VAT (Resi rear extension cost guide, Oct 2025).
Sources: Wandsworth Council - Conservation area appraisals register (2026); Rear extension — single storey (Resi rear extension cost guide, Oct 2025) (2026)
What a House Extension Involves
An extension reshapes how the whole ground floor works, not just how big it is — the new structure, the opening into the existing house, the kitchen and the garden connection all have to be designed as one move. We take each project from feasibility drawings through consents, structure and fit-out under a single fixed-price contract. Most extensions we build include the scope below.
- Rear extensions — single-storey additions that open the back of the house to the garden
- Side-return & wraparound — infilling the side alley of a terrace, alone or combined with a rear addition
- Double-storey — new bedrooms or bathrooms above the ground-floor addition, designed to sit comfortably with the original roofline
- Foundations & steel — groundworks, beams and the opening into the existing house, engineered by our own structural team
- Glazing — rooflights, glazed roofs and slim-framed sliding or bi-fold doors specified for light and thermal performance
- Kitchen integration — the kitchen layout planned with the architecture from the first drawing, not squeezed in afterwards
- Services & heating — electrics, plumbing, drainage and underfloor heating built into the new floor
- External works — patio, drainage connections and garden reinstatement completed within the contract
How We Run Your Project
Six stages, with the consents and engineering settled before the first spade goes in.
- Feasibility visit — we assess the site, the boundaries and your brief, and identify the right consent route for your property.
- Design & approvals — our architects draw the scheme while planning or permitted development paperwork, structural calculations and party wall notices progress together.
- Fixed-price contract — every element specified and priced before construction, from foundations to door hardware.
- Groundworks & shell — excavation, foundations, walls, steel and roof, taken to weathertight while you carry on living in the house.
- Fit-out — insulation, services, glazing, kitchen, flooring and decoration, with the opening into the existing house formed once the shell is sealed.
- Completion — building control inspection, snagging, external works and handover with the full certification pack.
Read the full house extension guide for extension types, permitted development limits and the build programme stage by stage.
Many rear extensions can proceed under permitted development — broadly up to 3m deep on attached houses and 4m on detached, extendable to 6m and 8m through the prior approval scheme — but conservation areas, Article 4 directions and listed status change the picture, and every extension needs Building Regulations approval regardless of the planning route. Where foundations come within 3m of a neighbouring building, the Party Wall etc. Act 1996 obliges you to give adjoining owners a minimum of two months’ written notice before construction can begin. Our planning guide library sets out the rules for each borough.
Why Hampstead Renovations
We hold £10 million public liability insurance with Aviva; the certificate is available on request.
House Extensions in Putney: Questions
Do Putney's conservation areas affect extensions?
They do. Putney sits in the London Borough of Wandsworth, with conservation areas protecting its best streets between the river and the heath, and an extension within one is judged against that protected setting. We confirm whether your street is covered before fixing the design approach.
Which Putney houses take extensions well?
The Edwardian and Victorian family terraces of Disraeli Road and the streets off the Lower Richmond Road — houses made for lofts, rear extensions and refurbishment. Putney Hill, by contrast, carries grand Victorian villas and mansion blocks, and Putney High Street anchors riverside flats and conversions, so the right approach shifts as you move up from the river.
Do trees and garden boundaries matter for a Putney extension?
More than most owners expect. Costs in SW15 depend on tree and boundary constraints alongside terrace or villa structure, party walls, drainage and rear levels, facade and roof interfaces, glazing specification and access between established streets and gardens — and our local Putney material covers trees, boundaries and private front gardens in planning for precisely that reason. We assess them at survey stage rather than discovering them on site.
How much does a side-return extension cost in Putney?
The London-wide band is £90,000–£120,000 excluding VAT, and the Edwardian and Victorian terraces of Disraeli Road and the Lower Richmond Road grid are exactly the houses it was made for — the side return opens the kitchen across the full width of the plot without touching the street elevation.
Can flats near Putney High Street be extended or reconfigured?
The riverside flats and conversions around Putney High Street are leasehold projects, so structure, acoustics and freeholder consents have to be handled together — and often the realistic route is internal reconfiguration rather than added floor area. Where a scheme is possible, we sequence the freeholder’s consent alongside the design so the programme holds.
Local character & heritage: extending in Putney
Putney sits in the London Borough of Wandsworth, and extending here means working with Victorian and Edwardian terraces and villas near the river. Where houses and gardens allow, side-return and rear extensions open up the living space; in the many flats, the equivalent is internal reconfiguration and, where possible, lower-ground additions.
Permitted-development rights are usually restricted in Putney's conservation areas, so most extensions need a full householder application, and conservation areas protect many of the period streets. We design every extension to respect the period frontage and to win consent.
Putney heritage & architecture: Conservation areas · Roof developments & conservation · Listed buildings · Renovating a period terrace · Period facades · Facade planning rules
House Extensions in Putney: Planning & Local Context
London Borough of Wandsworth · SW15
Planning for house extensions in Putney
Rear and side-return extensions are popular in Putney, but permitted-development rights are frequently restricted within Putney's conservation areas, so most extensions need a full planning application to London Borough of Wandsworth with design that respects the prevailing building line and materials.
London Borough of Wandsworth context
Putney SW15 sits within Putney's conservation areas, and Wandsworth's Local Plan and conservation-area controls shape rear, side-return and roof alterations across its Victorian terraces. Our in-house RIBA Chartered Architects prepare and submit every application to London Borough of Wandsworth and handle pre-application discussions where early planning advice is useful.
Building Regulations
House Extensions in Putney must satisfy Building Regulations — covering structural design to Part A, thermal performance to Part L, and drainage and foundations agreed with Building Control. Our in-house engineers manage Building Control from initial notice to completion certificate.
Recent work & local links
Explore our other Putney services — Kitchen Renovation Loft Conversions — or the Putney renovation hub.
Our in-house planning team prepares and submits every London Borough of Wandsworth application and manages building control end to end. View our planning track record →
House Extensions in Nearby Areas
More Services in Putney
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We survey your property, discuss your vision and provide a clear budget framework.