House
extensions
in Parsons Green, SW6
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 Parsons Green house extensions across Parsons Green's principal residential streets - side-return, rear, wraparound and double-storey additions for Victorian terraces, “Lions/“Alphabets Streets and Edwardian villas where planning strategy, conservation detailing, Party Wall sequencing and structural engineering need handling properly.
House Extensions in Parsons Green: What You Need to Know
Every house extension project in Parsons Green is designed to respect the Parsons Green Conservation Area and the character of Victorian terraces, “Lions/“Alphabets streets, Edwardian villas. Our in-house RIBA Chartered Architects handle Hammersmith & Fulham 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.
Parsons Green falls within a conservation area, which means visible external alterations require careful design and often full planning permission. Our architects have extensive experience securing approvals in Hammersmith & Fulham's conservation areas.
Our house extension projects in Parsons Green 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.
In Parsons Green the consent question arrives before the construction one. Planning Data records the neighbourhood as a Hammersmith and Fulham conservation area centred on its green, and the council both examines external change and enforces Article 4 controls here, so many of the permitted-development rights an owner would lean on elsewhere are simply unavailable. An addition that looks routine on paper generally needs a full application judged on conservation grounds.
The houses themselves are distinctive. The Peterborough Estate's celebrated 'Lion' houses, with stone lions on their gables, line Studdridge Street and Quarrendon Street; handsome Victorian terraces fill Novello Street and the roads around the green; and there is a healthy supply of period flat conversions. That family-house stock lends itself to lofts, to rear and side-return additions that open kitchens onto gardens, and to full refurbishment.
Construction then answers to the plot: party-wall awards, tight rear access and freeholder sign-off on divided houses shape the outcome. For a Parsons Green rear extension the guide spans £71,250 to £112,500 before VAT, with a side return nearer £90,000 to £120,000.
House Extensions in Parsons Green: Applied to the Local Stock
Parsons Green sits in the London Borough of Hammersmith and Fulham, within the Parsons Green conservation area, around its namesake green. London-wide indicative market band for wraparound extension: £100,000–£200,000 (source VAT treatment unstated, shown as an indicative market band, not a normalised ex-VAT figure) (Resi wraparound extension guide, 2025).
Sources: LBHF — Parsons Green Conservation Area (character profile page) (2026); Wraparound extension (Resi wraparound extension guide, 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 Parsons Green: Questions
Can I rely on permitted development to extend in Parsons Green?
Rarely. The neighbourhood forms its own conservation area around the green, and Hammersmith and Fulham both examines external change here and enforces Article 4 controls. That pairing strips out much of the permitted-development freedom owners assume, so a Parsons Green extension is usually taken through a full planning application from the start.
What sort of houses get extended in Parsons Green?
Mostly family houses. The Peterborough Estate is famous for its 'Lion' houses on Studdridge Street and Quarrendon Street, and long Victorian terraces run along Novello Street and the roads circling the green. On that stock the typical brief is a loft, a rear or side-return extension, or a whole-house refurbishment.
What will a rear or side extension cost in Parsons Green?
In Parsons Green a single-storey rear addition is guided, London-wide, at £71,250 to £112,500 before VAT. A side return usually costs more, about £90,000 to £120,000, while a fuller wraparound carries an indicative market band of £100,000 to £200,000. We convert those into a scheme figure once the design is fixed.
Beyond floor area, what pushes up the cost of a Parsons Green extension?
On these narrow terrace plots the real drivers are party-wall awards, restricted rear access, steelwork that has to be carried through an occupied family house, keeping any new roof subordinate to the street, and, where a house has been split into flats, obtaining lease or freeholder consent. Those factors move the budget more than the extra square metres.
Does the exact Parsons Green street change what I can build?
It does. The opening move here is to check the precise road and sub-area, because visible dormers, mansards, front-roof changes and anything affecting the uniform terraces need conservation-led drawings and a settled permission route. Getting Hammersmith and Fulham's rules for your address right early keeps a Parsons Green project moving.
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We survey your property, discuss your vision and provide a clear budget framework.