What you could build at W5 3RJ: 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 Ealing Common & Twyford Ave, Ealing.
83extensions seen within 600 m in the last 10 years
8loft conversions within 600 m in the last 10 years
94.7extensions 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 Creffield conservation area: permitted development is narrower (for example no side extensions or roof cladding), and demolition and works to trees need consent.
No Article 4 direction recorded for this postcode.
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 Ealing Common & Twyford Ave.
Move to a home 20 m² bigger (about £953,000)
Stamp duty on the new home
£39,050
Estate agent on yours 1.2% + VAT
£11,736
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£55,886
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
−£82,800
Money gone
−£25,300
On these figures, extending loses about £81,186 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.
156, Noel Road, W3 0jr
Rear extension
Under consideration
–
261842HH
64, Fordhook Avenue, W5 3lr
Rear extension
Approved
Jul 2026
261824HH
30, Inglis Road, W5 3rl
Loft or dormer
Under consideration
–
261542HH
8, Layer Gardens, W3 9pr
Loft or dormer
Approved
Jul 2026
261457HH
23, Boileau Road, W5 3al
Two-storey extension
Approved
Apr 2026
260553HH
154, Noel Road, W3 0jr
Rear extension
Not needed / lawful
Apr 2026
260456PALHE
59, Fordhook Avenue, W5 3ls
Loft or dormer
Refused
Feb 2026
254675HH
7, Montague Gardens, W3 9pt
Outbuilding or garden room
Approved
Jan 2026
254529HH
82, Boileau Road, W5 3aj
Loft or dormer
Approved
Jan 2026
254437HH
2, Boileau Road, W5 3ah
Rear extension
Approved
Feb 2026
254153HH
96, Twyford Avenue, W3 9qf
Side return or wrap-around
Approved
Dec 2025
254023HH
267, Noel Road, W3 0jp
Porch or front extension
Approved
Nov 2025
253724HH
61, Creffield Road, W3 9ps
Loft or dormer
Approved
Mar 2026
253603HH
162, Noel Road, W3 0jr
Windows, doors or cladding
Approved
Nov 2025
253467HH
79, Twyford Avenue, W3 9qd
Other householder work
Approved
Sept 2025
252804HH
162, Noel Road, W3 0jr
Rear extension
Not needed / lawful
Aug 2025
252652PALHE
162, Noel Road, W3 0jr
Rear extension
Not needed / lawful
Aug 2025
252725PALHE
42, Fordhook Avenue, W5 3lp
Rear extension
Approved
Jul 2025
251945HH
2, Boileau Road, W5 3ah
Rear extension
Approved
Jul 2025
251672HH
1, Leopold Road, W5 3pb
Two-storey extension
Approved
Jul 2025
251129HH
31, Boileau Road, W5 3ap
Outbuilding or garden room
Approved
May 2025
250596HH
10, Creffield Road, W5 3hp
Rear extension
Approved
May 2025
250727HH
78, Creffield Road, W3 9ps
Loft or dormer
Approved
Sept 2025
250617HH
3, Montague Gardens, W3 9pt
Loft or dormer
Approved
Apr 2025
250521HH
66, Boileau Road, W5 3aj
Rear extension
Approved
Mar 2025
250254HH
9, Montague Gardens, W3 9pt
Loft or dormer
Approved
Apr 2025
250217HH
82a, Twyford Avenue, W3 9qf
Basement
Approved
Mar 2025
250123HH
54, Birch Grove, W3 9sr
Rear extension
Approved
Jan 2025
244500HH
2a, Hamilton Road, W5 2eq
Loft or dormer
Approved
Nov 2024
243330HH
261, Noel Road, W3 0jp
Rear extension
Not needed / lawful
Aug 2024
242672PALHE
13, Inglis Road, W5 3rh
Loft or dormer
Approved
Sept 2024
242346HH
34, Boileau Road, W5 3ah
Rear extension
Approved
Aug 2024
242105HH
48, Creffield Road, W5 3rp
Windows, doors or cladding
Approved
Jul 2024
242197HH
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% (76)
88%
8 weeks
Basement
–
81% (52)
83%
10 weeks
Porch or front extension
–
80% (64)
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.