House extension cost
in Primrose Hill.
Primrose Hill — NW1 — between Camden and St John's Wood, north of Regent's Park. Pastel-painted Victorian terraces and one of London's most photographed residential streetscapes.
What makes extension work in Primrose Hill distinct.
Housing: Victorian and early Edwardian terraces, three to four storeys, with strong original detailing.
Planning: Primrose Hill Conservation Area covers the entire neighbourhood. Article 4 applies on key streets.
Applications go to LB Camden. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — NW1 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Primrose Hill multiplier (1.15×) 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 Primrose Hill and beyond.
Send me the guide.
What Primrose Hill homeowners ask us.
How much does a house extension cost in Primrose Hill in 2026?
Typical 2026 Primrose Hill ranges (inc. design, planning, build, contingency & VAT): side-return extensions £104k–£184k; single-storey rear £127k–£242k; wraparound £196k–£368k; double-storey rear £207k–£437k; basement £288k–£863k. The Primrose Hill multiplier (1.15×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Primrose Hill?
Primrose Hill Conservation Area covers the entire neighbourhood. Article 4 applies on key streets. 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 Camden.
What extension type works best for Primrose Hill houses?
Victorian and early Edwardian terraces, three to four storeys, with strong original detailing. 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 Primrose Hill?
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 Camden processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Primrose Hill homeowners out on extensions?
In NW1 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 Primrose Hill extensions?
Yes — Primrose Hill is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 8.0km from Primrose Hill. We've delivered extensions across the NW1 postcode and our subcontractor network covers Camden. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Primrose Hill’s neighbours.
Twenty minutes on site in Primrose Hill.
On us.
Nick Elias RIBA and Vladimir will visit your Primrose Hill 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 Primrose Hill extension using the same 2026 rate card we quote real clients with.
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