House
extensions
in Pimlico, SW1V
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 Pimlico house extensions across Warwick Square, Eccleston Square, St George’s Square - side-return, rear, wraparound and double-storey additions for Stucco Cubitt terraces, Garden-Square houses and Large Mansion Blocks where planning strategy, conservation detailing, Party Wall sequencing and structural engineering need handling properly.
House Extensions in Pimlico: What You Need to Know
Every house extension project in Pimlico is designed to respect the Pimlico Conservation Area and the character of stucco Cubitt terraces, garden-square houses, large mansion blocks. Our in-house RIBA Chartered Architects handle Westminster 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.
In Pimlico's conservation area, extensions must be designed with exceptional sensitivity. Westminster officers assess impact on the host building, neighbouring properties, and the wider streetscape. We secure planning approval through design excellence and thorough pre-application engagement.
Grid of elegant Regency terraces south of Victoria with Pimlico Road antique shops and Tachbrook Street market. Westminster conservation area with unified architectural character. Our extensions in Pimlico use materials and detailing that complement the existing architecture — whether matching traditional brickwork and stonework or introducing high-quality contemporary glazing and zinc cladding.
Pimlico is Cubitt's other great stucco estate, and its uniformity is exactly what an extension must respect. The area lies in the City of Westminster, inside the Pimlico Conservation Area, on Thomas Cubitt's grid of white-stucco terraces and garden squares south of Victoria. Cambridge Street and Tachbrook Street carry uniform white-fronted runs, and the conservation area guards that consistency, so external change stays subordinate to the rhythm of the terrace.
The squares add grander candidates for work. Warwick Square and Eccleston Square are period houses on leafy garden squares, suited to whole-house refurbishment and reconfiguration, while much of the surrounding stock — around St George's Square, Lupus Street and Tachbrook Street — is now mansion flats, Edwardian facades and mews-like streets. Where a house is divided into flats, leasehold consents run alongside Westminster's decisions.
Cost reflects detailing and tenure rather than plan area. A Pimlico rear extension sits in a £71,250 to £112,500 band before VAT, a side return to £90,000 to £120,000, with a wraparound shown as an indicative £100,000 to £200,000 market band.
House Extensions in Pimlico: Applied to the Local Stock
Pimlico sits in the City of Westminster, within the Pimlico Conservation Area, on Thomas Cubitt’s grid of white-stucco terraces and garden squares south of Victoria. London-wide cost band for rear extension — single storey: £71,250–£112,500 excluding VAT (Resi rear extension cost guide, Oct 2025).
Sources: Westminster City Council — Pimlico Conservation Area mini guide (May 2004) (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 Pimlico: Questions
How does Pimlico's Cubitt stucco grid shape an extension?
Pimlico lies in the City of Westminster, inside the Pimlico Conservation Area, on Thomas Cubitt's grid of white-stucco terraces and garden squares south of Victoria. That uniformity is precisely what the conservation area protects, so on the Cubitt terraces an addition is measured against a highly consistent streetscape and external change is kept subordinate to the run.
Which Pimlico streets have the classic stucco terraces and garden squares?
Cambridge Street and Tachbrook Street carry uniform white-fronted Cubitt runs, while Warwick Square and Eccleston Square are period houses on leafy garden squares suited to whole-house refurbishment and reconfiguration. Those addresses are the natural candidates for ambitious work within Pimlico's coherent grid.
What does an extension cost in Pimlico?
London-wide guidance sets a Pimlico rear extension in a £71,250 to £112,500 band before VAT. A side return runs higher, to £90,000 to £120,000, with a wraparound at an indicative £100,000 to £200,000. On the uniform Cubitt terraces, conservation detailing and, where relevant, leasehold coordination decide where a scheme lands.
Are many Pimlico houses divided into flats?
A good number. SW1 here takes in Victorian terraces, mansion flats, Edwardian facades, mews-like streets and garden-square homes around St George's Square, Lupus Street and Tachbrook Street. Where a house is in flats, the leasehold consents run alongside Westminster's decisions, so an addition is planned for both.
What is the property stock like in Pimlico?
Pimlico is Cubitt's other great stucco estate: stucco Cubitt terraces, garden-square houses and large mansion flats. Its characteristic streets include Warwick Square, Eccleston Square, Cambridge Street and Tachbrook Street, and getting Westminster's stucco and conservation rules right early keeps a Pimlico scheme on track.
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