What you could build at W8 4RP: 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 South, Kensington and Chelsea.
168extensions seen within 600 m in the last 10 years
15loft conversions within 600 m in the last 10 years
100.4extensions 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
Mostly flats at this postcode. Flats have no permitted development rights, so almost any extension or loft conversion needs planning permission, and the freeholder's consent under the lease.
In the Kensington Palace 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 57): 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 South.
Move to a home 20 m² bigger (about £1,961,000)
Stamp duty on the new home
£149,070
Estate agent on yours 1.2% + VAT
£23,832
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£178,002
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
−£183,600
Money gone
−£126,100
On these figures, extending loses about £304,102 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.
38 Argyll Road, London, W8 7bs
Outbuilding or garden room
Withdrawn
Apr 2026
PP/25/06268
9 Palace Green, London, W8 4qa
Other householder work
Approved
Jul 2026
PP/25/06352
29 Campden Street, London, W8 7ep
Loft or dormer
Approved
Mar 2026
PP/25/06090
29 Campden Street, London, W8 7ep
Loft or dormer
Approved
Mar 2026
PP/25/06094
72 Campden Street, London, W8 7en
Other householder work
Approved
Mar 2026
PP/25/05978
31 Jameson Street, London, W8 7sh
Windows, doors or cladding
Approved
Nov 2025
PP/25/05805
89, 89 Bedford Gardens, London, W8 7eq
Other householder work
Withdrawn
Nov 2025
PP/25/05136
39, 39 Clanricarde Gardens, London, W2 4jn
Other householder work
Approved
Apr 2026
CL/25/05276
1, 1 Thornwood Gardens, London, W8 7ea
Rear extension
Approved
Oct 2025
PP/25/04838
19, 19 Palace Gardens Terrace, London, W8 4sa
Windows, doors or cladding
Approved
Sept 2025
PP/25/04908
32 Sheffield Terrace, London, W8 7na
Other householder work
Approved
Oct 2025
PP/25/04631
21, 21 Jameson Street, London, W8 7sh
Other householder work
Approved
Sept 2025
PP/25/04742
89 Bedford Gardens, London, W8 7eq
Rear extension
Approved
Oct 2025
PP/25/04029
72, 72 Campden Street, London, W8 7en
Other householder work
Withdrawn
Sept 2025
PP/25/04484
75, 75 Peel Street, London, W8 7pb
Other householder work
Approved
Sept 2025
PP/25/04664
18, 18 Farm Place, London, W8 7sx
Two-storey extension
Refused
Oct 2025
PP/25/04640
8, 8 Rabbit Row, London, W8 4dx
Loft or dormer
Approved
Nov 2025
PP/25/04590
55, 55 Hillgate Place, London, W8 7ss
Other householder work
Refused
Nov 2025
PP/25/04518
18, 18 Hillgate Place, London, W8 7sj
Other householder work
Approved
Oct 2025
PP/25/04451
5, 5 Farm Place, London, W8 7sx
Loft or dormer
Approved
Oct 2025
PP/25/04430
3, 5, 7 And 9 Drayson Mews, London, W8 4ly
Other householder work
Refused
Aug 2025
CL/25/04028
21 Jameson Street, London, W8 7sh
Windows, doors or cladding
Approved
Sept 2025
PP/25/03781
14 Gloucester Walk, London, W8 4hz
Windows, doors or cladding
Approved
Sept 2025
PP/25/03956
32 Kensington Place, London, W8 7pr
Side return or wrap-around
Approved
Sept 2025
PP/25/03965
4-8 Drayson Mews, London, W8 4ly
Loft or dormer
Refused
Aug 2025
CL/25/04064
10-12 And 20 Drayson Mews, London, W8 4ly
Other householder work
Refused
Aug 2025
CL/25/04065
Flat 11, Kensington Heights, 91-95 Campden Hill Road, London, W8 7bd
Windows, doors or cladding
Approved
Jul 2025
CL/25/03545
21 Jameson Street, London, W8 7sh
Other householder work
Approved
Aug 2025
PP/25/03789
31 Jameson Street, London, W8 7sh
Windows, doors or cladding
Refused
Aug 2025
PP/25/03663
1 Palace Gardens Terrace, London, W8 4sa
Basement
Approved
Oct 2025
PP/25/03234
6 Bedford Gardens, London, W8 7eh
Other householder work
Approved
Aug 2025
PP/25/03374
18 Pitt Street, London, W8 4ny
Other householder work
Approved
Aug 2025
PP/25/03162
70 Hornton Street, London, W8 4nu
Windows, doors or cladding
Approved
Jun 2025
CL/25/02946
152 Campden Hill Road, London, W8 7as
Windows, doors or cladding
Approved
Jun 2025
PP/25/02812
89 Bedford Gardens, London, W8 7eq
Other householder work
Withdrawn
Jun 2025
PP/25/02300
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
91% (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.