Why NW6 is perfect for house extensions
NW6 is packed with Victorian terraces and Edwardian properties with narrow side returns and compact rear additions — exactly the kind of houses that benefit most from a well-designed extension. Streets like Sumatra Road, Crediton Hill, Loveridge Road and Iverson Road are lined with properties where a side-return or rear extension transforms the entire ground floor.
A house extension in NW6 typically adds £80,000–£200,000 to the property value. With West Hampstead and Kilburn property values rising steadily, extending is almost always a better investment than moving.
NW6 is split between Camden Council and Brent Council — each with different planning policies. We work with both regularly and know which properties fall under which authority.
NW6 areas we build in
NW6 spans two boroughs with different planning rules. We know both inside out.
West Hampstead
Victorian and Edwardian terraces with side-return potential. Extensions here create transformative open-plan kitchen-diners. Camden Council planning.
Kilburn
Generous Victorian terraces with good garden depth. Rear and wrap-around extensions popular. Split between Camden and Brent — we check your exact address.
Brondesbury
Larger Edwardian properties on wider plots. Two-storey extensions feasible on many. Conservation area in parts — Brent Council planning.
Queens Park
Conservation area with Edwardian terraces. Extensions must complement the period character. We design heritage-sensitive extensions that Brent approves.
Kilburn Park
Victorian terraces with good extension potential. Side-returns and rear extensions under PD on most properties. Westminster or Brent Council depending on location.
Two-Borough Expertise
NW6 is split between Camden and Brent councils. PD allowances, planning policies and conservation area rules differ. We know both authorities and handle all applications.
"Hampstead Renovations transformed our cramped Victorian kitchen into a stunning open-plan kitchen-diner with bi-fold doors to the garden. The team managed all the planning and party wall issues, and the quality of the build was outstanding."Sarah & David MitchellHomeowners, Hampstead NW3
House extension costs in NW6
NW6 extension costs are slightly lower than central Hampstead due to easier access and less conservation area complexity.
| Extension Type | Typical Range (Hampstead) |
|---|---|
| Single-storey rear extension | £48,000 – £80,000 |
| Side-return extension | £38,000 – £60,000 |
| Wrap-around (rear + side) | £70,000 – £110,000 |
| Two-storey rear extension | £90,000 – £150,000 |
| Kitchen extension (open-plan) | £52,000 – £90,000 |
| Glass box / frameless glazing | £60,000 – £110,000 |
| Bi-fold / sliding doors | £3,500 – £8,000 |
| Underfloor heating | £2,500 – £5,000 |
All prices exclude VAT. Includes foundations, structural steelwork, brickwork, roofing, windows, electrics, plumbing, plastering, decoration and Building Control sign-off. Prices reflect Hampstead-area build costs as of 2026.
House extension FAQ — NW6
The entire NW6 postcode: West Hampstead, Kilburn, Brondesbury, Queens Park, Kilburn Park. Our office on Finchley Road is just minutes away from any NW6 address.
NW6 is split between the two. West Hampstead and parts of Kilburn are Camden. Brondesbury, Queens Park and parts of Kilburn are Brent. Planning rules differ. We check your exact address and handle whichever authority applies.
Side-return extensions transforming narrow kitchens into open-plan kitchen-diners are by far the most popular in NW6. Rear extensions with bi-fold doors are a close second.
Single-storey rear extensions up to 3m (terraced) often fall under PD. But Queens Park and parts of Brondesbury are conservation areas with restricted PD. We check your specific property and handle all applications.
Side-return extensions in NW6 start from £38,000. Single-storey rear £48,000–£80,000. Wrap-around £70,000–£110,000. Two-storey £90,000–£150,000. All inclusive.
Single-storey rear or side-return: 10–14 weeks on site. Wrap-around: 14–18 weeks. Two-storey: 16–22 weeks. Add 4–12 weeks for design, planning and party wall.
Book a free extension consultation in NW6
We'll visit your NW6 property, assess extension options, confirm which council you're under, check PD eligibility, and provide a fixed price — completely free.
Unit 3, Palace Court, 250 Finchley Road, Hampstead, London NW3 6DN
Mon–Fri 9am–8pm · Saturday 9am–6pm · Sunday by appointment
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