House extension cost
in Parsons Green.
Parsons Green sits at the heart of SW6, ten minutes from our Dawes Road studio. The District Line and the green itself anchor a tight grid of Victorian terraces — the prototypical London loft-conversion candidate.
What makes extension work in Parsons Green distinct.
Housing: Late Victorian two- and three-storey terraces with original rear outriggers and pitched slate roofs, ideal for L-shape dormers.
Planning: Parsons Green & Walham Green Conservation Area covers most of the streets around the green — full planning is usually required and PD rights are restricted.
Applications go to LB Hammersmith & Fulham. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — SW6 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Parsons Green multiplier (1.05×) reflects local labour, scaffolding logistics, conservation requirements and finish expectations.
The 2026 London Extension Cost Guide.
Borough-by-borough pricing, a full £200k cost breakdown, PD vs full planning explained, and the seven hidden costs to watch for in Parsons Green and beyond.
Send me the guide.
What Parsons Green homeowners ask us.
How much does a house extension cost in Parsons Green in 2026?
Typical 2026 Parsons Green ranges (inc. design, planning, build, contingency & VAT): side-return extensions £95k–£168k; single-storey rear £116k–£221k; wraparound £179k–£336k; double-storey rear £189k–£399k; basement £263k–£788k. The Parsons Green multiplier (1.05×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Parsons Green?
Parsons Green & Walham Green Conservation Area covers most of the streets around the green — full planning is usually required and PD rights are restricted. Outside conservation areas, single-storey rear extensions up to 3m (terrace/semi) or 4m (detached) usually qualify for permitted development. Side-returns, wraparounds, double-storey extensions and anything in a conservation area need full planning. Applications go to LB Hammersmith & Fulham.
What extension type works best for Parsons Green houses?
Late Victorian two- and three-storey terraces with original rear outriggers and pitched slate roofs, ideal for L-shape dormers. On this housing stock, the most common 2VP extension is a single-storey rear or wraparound — adding 20–35 m² of open-plan kitchen-diner. Double-storey extensions become viable on properties with rear gardens deep enough to absorb the additional volume without overshadowing.
How long does an extension take in Parsons Green?
Allow 8–12 weeks for design and planning (longer in conservation areas), then 16–22 weeks on site for a single-storey, 22–30 weeks for a wraparound or double-storey, and 28–40 weeks for a basement. LB Hammersmith & Fulham processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Parsons Green homeowners out on extensions?
In SW6 the top items are: party wall awards (£1,000–£3,000 per neighbour — common on terraced streets), build-over agreements with Thames Water (£300–£1,500 where drains run beneath the proposed extension), conservation officer consultations, structural engineer fees, drainage and asbestos surveys, and VAT at 20% on top of the base build cost. All of these are itemised in our fixed-price quote.
Does 2VP work on Parsons Green extensions?
Yes — Parsons Green is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 0.7km from Parsons Green. We've delivered extensions across the SW6 postcode and our subcontractor network covers Hammersmith & Fulham. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Parsons Green’s neighbours.
Twenty minutes on site in Parsons Green.
On us.
Nick Elias RIBA and Vladimir will visit your Parsons Green home, walk the site, check planning constraints, advise on PD vs full planning, and give you a realistic budget and programme — even if an extension isn’t the right move.
One number. Sixty seconds. No callback.
Price your Parsons Green extension using the same 2026 rate card we quote real clients with.
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