What you could build at W11 4QP: the planning rules at this address, what neighbours have built and how big, planning decisions nearby, rough costs and the value an extension adds, and how to get started. In Notting Hill West, Kensington and Chelsea.
152extensions seen within 600 m in the last 10 years
19loft conversions within 600 m in the last 10 years
134.1extensions per 1,000 homes in the neighbourhood (10 years)
● work seen on energy certificates · ● application approved · ● refused · ● pending or other · ● this postcode
The rules at this address
Houses usually have permitted development rights: some rear extensions (typically up to 3 m deep for a semi or terrace, 4 m detached), loft conversions within volume limits, and porches can go ahead without planning permission. Larger single-storey rear extensions (up to 6 m / 8 m) can use the “prior approval” neighbour scheme.
In the Norland conservation area: permitted development is narrower (for example no side extensions or roof cladding), and demolition and works to trees need consent.
Article 4 direction (Article 4 - No 100; Article 4 - No 96): some rights normally allowed have been removed here. Check what it covers with the council before relying on permitted development.
Listed buildings need listed building consent for most changes, inside and out: check the National Heritage List.
To be certain work is permitted development, apply for a lawful development certificate (about £129 for householders in England). Building regulations apply either way.
Across England and Wales, homes extended by a typical 30 m² and then resold rose about 11.1% more than similar homes nearby over the same years (124,884 resales). How extensions pay off by size, type and region.
Single-storey rear or side extension: about £2,000–£3,000 per m² (London £2,500–£4,000), plus fees and VAT
Loft conversion: about £45,000–£75,000 for a dormer; more for a mansard or hip-to-gable
Two-storey extension: about £1,800–£2,800 per m² of new floor
Garage conversion: about £15,000–£30,000
Basement: about £3,500–£5,000 per m², London mostly
Build costs are rough 2026 ranges from industry guides, not quotes. Get three quotes for your plans.
Move or improve?
The money you don't get back either way, for the same extra space in Notting Hill West.
Move to a home 20 m² bigger (about £2,170,000)
Stamp duty on the new home
£174,150
Estate agent on yours 1.2% + VAT
£26,496
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£205,746
Extend by 20 m²
Building, plus 15% for design, planning and contingency
£57,500
Less what it adds to your home's value 60% of the local price
−£198,000
Money gone
−£140,500
On these figures, extending loses about £346,246 less. Moving also changes the area, the schools and the commute; extending means months of building work and depends on planning.
Building costs vary a lot (a single-storey rear extension is often £2,000–£3,000 per m², more in London). How much space adds depends on the home and street: what extensions added to resale prices. A guide, not advice; nothing you type leaves this page.
Getting started
Look at what neighbours did. Open applications above to see drawings that were approved on similar houses, and who designed them.
Check the route: permitted development (with a lawful development certificate), prior approval for larger rear extensions, or full householder planning permission.
Get a measured survey and a designer: an architect, an architectural technologist or a designer who handles planning drawings.
Apply (householder permission is about £258 in England; councils aim to decide within 8 weeks).
Building regulations through the council's building control or an approved inspector, and party wall notices to neighbours if you build on or near the boundary.
Choose a builder: written quotes, a contract, staged payments, and check their insurance and references.
From energy certificates: an extension where a later certificate shows more floor space, a loft conversion where roof rooms appear. Certificates come with sales, lettings and some building work, so the year is when it was first seen.
Not every extension shows here. We only see building work when a new energy certificate is lodged, which happens when a home is sold, let or newly built. A loft or extension added since then won't appear, even with planning permission and building control sign-off, because those records aren't published as open data outside London. Missing work doesn't mean missing paperwork.
Other householder work
Approved
Apr 2026
CL/25/06581
1 St Ann'S Villas, London, W11 4ru
Rear extension
Approved
Apr 2026
PP/25/06683
11 Royal Crescent Mews, London, W11 4sy
Other householder work
Approved
Jun 2026
PA/25/06641
97 Portland Road, London, W11 4ln
Loft or dormer
Approved
Apr 2026
PP/25/06184
66 Princedale Road, London, W11 4nl
Other householder work
Under consideration
–
PA/25/06738
22 St James'S Gardens, London, W11 4re
Windows, doors or cladding
Approved
Apr 2026
PP/25/06600
3 Holland Park, London, W11 3tg
Basement
Approved
Apr 2026
PP/25/06235
13 Royal Crescent Mews, London, W11 4sy
Loft or dormer
Approved
May 2026
PA/25/06392
49 Holland Park Mews, London, W11 3sp
Loft or dormer
Approved
Apr 2026
PP/25/06397
24 St James'S Gardens, London, W11 4re
Two-storey extension
Approved
Apr 2026
PP/25/06202
18, 18 Woodsford Square, London, W14 8dp
Basement
Approved
Jun 2026
PP/25/05001
17 Flat 4, Holland Park, W11 3td
Other householder work
Under consideration
–
LB/25/05120
41 Clarendon Road, London, W11 4jb
Other householder work
Approved
Mar 2026
PP/25/05474
22 Addison Avenue, London, W11 4qr
Loft or dormer
Approved
Nov 2025
PP/25/05501
91-93 Princedale Road, London, W11 4ns
Other householder work
Approved
Oct 2025
CL/25/05438
118 Elgin Crescent, London, W11 2jl
Loft or dormer
Approved
Nov 2025
PP/25/05421
88, 88 Ladbroke Road, London, W11 3nu
Other householder work
Refused
Nov 2025
PP/25/05415
139, 139 Elgin Crescent, London, W11 2jh
Loft or dormer
Approved
Sept 2025
PP/25/04957
151 Portland Road, London, W11 4lr
Loft or dormer
Approved
Oct 2025
PP/25/02992
17 Queensdale Place, London, W11 4sq
Windows, doors or cladding
Approved
Oct 2025
PP/25/04942
22, 22 Addison Avenue, London, W11 4qr
Other householder work
Approved
Oct 2025
PP/25/04677
2, 2 Holland Park Mews, London, W11 3su
Other householder work
Approved
Sept 2025
PP/25/04485
2 Carson Terrace, Princes Place, London, W11 4qt
Garage conversion or garage
Approved
Sept 2025
PP/25/04400
61, 61 Clarendon Road, London, W11 4je
Windows, doors or cladding
Approved
Aug 2025
PP/25/03993
12 Holland Park, London, W11 3th
Loft or dormer
Refused
Oct 2025
PP/25/04103
49, 49 Holland Park Mews, London, W11 3sp
Windows, doors or cladding
Refused
Sept 2025
PP/25/03997
17, 17 Holland Villas Road, London, W14 8bt
Two-storey extension
Withdrawn
Sept 2025
PP/25/04235
24, 24 Woodsford Square, London, W14 8dp
Loft or dormer
Approved
Aug 2025
PP/25/04236
85, 85 Addison Road, London, W14 8ed
Garage conversion or garage
Withdrawn
Aug 2025
PP/25/04083
8 Lansdowne Road, London, W11 3lw
Rear extension
Approved
Aug 2025
PP/25/03706
14 Holland Park Mews, London, W11 3su
Windows, doors or cladding
Approved
Aug 2025
PP/25/03764
30 Queensdale Road, London, W11 4sa
Windows, doors or cladding
Approved
Sept 2025
PP/25/03377
41, Studio Flat 2, 41 Mary Place, London, W11 4pl
Other householder work
Approved
Jun 2025
CL/25/03246
10 Holland Park, London, W11 3th
Basement
Approved
Oct 2025
PP/25/03578
42 Pottery Lane, London, W11 4lz
Other householder work
Approved
Aug 2025
PP/25/03622
Householder applications validated since 2023 within 600 m. The council's page has the drawings, the decision notice and who the agent or architect was. Hover a row for the description. Source: GLA Planning London Datahub.
–
88%
8 weeks
Basement
96% (23)
–
83%
9 weeks
Porch or front extension
–
–
81%
8 weeks
Share of decided applications approved since 2023 (number decided in brackets). Withdrawn applications aren't counted; many are withdrawn when refusal looks likely.