What you could build at UB2 5AS: 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 Southall Green East, Ealing.
85extensions seen within 600 m in the last 10 years
5loft conversions within 600 m in the last 10 years
104.4extensions 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
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.
Not in a conservation area (from council registers).
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 Southall Green East.
Move to a home 20 m² bigger (about £443,000)
Stamp duty on the new home
£12,150
Estate agent on yours 1.2% + VAT
£5,112
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£22,362
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
−£52,800
Money gone
£4,700
On these figures, extending loses about £17,662 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.
Approved
Feb 2026
254785HH
4, Scotts Road, Ub2 5db
Rear extension
Not needed / lawful
Jan 2026
254690PALHE
32, Lonsdale Road, Ub2 5ls
Outbuilding or garden room
Approved
Jan 2026
254371HH
32, Dudley Road, Ub2 5ar
Rear extension
Not needed / lawful
Dec 2025
254247PALHE
92, Scotts Road, Ub2 5de
Two-storey extension
Approved
Jan 2026
253635HH
32, Lonsdale Road, Ub2 5ls
Side return or wrap-around
Approved
Nov 2025
253404HH
32, Lonsdale Road, Ub2 5ls
Rear extension
Approved
Aug 2025
252877PALHE
1, Caxton Road, Ub2 5lr
Outbuilding or garden room
Approved
Jul 2025
252210HH
32, Lonsdale Road, Ub2 5ls
Two-storey extension
Refused
Jul 2025
251794HH
2, Belmont Avenue, Ub2 5ht
Rear extension
Not needed / lawful
Apr 2025
250944PALHE
101, Scotts Road, Ub2 5df
Rear extension
Approved
Jan 2025
244760HH
13, St Johns Road, Ub2 5an
Two-storey extension
Refused
Dec 2024
243794HH
65, Derley Road, Ub2 5en
Outbuilding or garden room
Approved
Nov 2024
243642HH
26, Marlborough Road, Ub2 5lw
Rear extension
Not needed / lawful
Oct 2024
243517PALHE
151, Queens Road, Ub2 5ba
Rear extension
Not needed / lawful
Aug 2024
242717PALHE
50, Grange Road, Ub1 1by
Rear extension
Not needed / lawful
Jul 2024
242306PALHE
28, Clarence Street, Ub2 5bn
Rear extension
Not needed / lawful
Aug 2024
241901PALHE
48, Grange Road, Ub1 1by
Rear extension
Refused
May 2024
241497PALHE
8, Lewis Road, Ub1 1bt
Rear extension
Not needed / lawful
Apr 2024
241201PALHE
9, Grange Road, Ub1 1by
Rear extension
Approved
Apr 2024
240858HH
117a, Greenland Crescent, Ub2 5es
Loft or dormer
Approved
Mar 2024
240521HH
22, Hammond Road, Ub2 4eg
Side return or wrap-around
Approved
Mar 2024
240266HH
3, Scotts Road, Ub2 5dd
Two-storey extension
Approved
Mar 2024
235030HH
117a, Greenland Crescent, Ub2 5es
Rear extension
Not needed / lawful
Jan 2024
235136PALHE
44, Johnson Street, Ub2 5by
Rear extension
Not needed / lawful
Oct 2023
232907PALHE
3, Scotts Road, Ub2 5dd
Rear extension
Not needed / lawful
Aug 2023
232882PALHE
19, Dagmar Road, Ub2 5nx
Rear extension
Not needed / lawful
Jul 2023
232749PALHE
3, Scotts Road, Ub2 5dd
Two-storey extension
Withdrawn
Oct 2023
232708HH
8, Lewis Road, Ub1 1bt
Rear extension
Refused
Jul 2023
232146PALHE
Western Court, Western Road, Ub2 5hd
Other householder work
Refused
Jul 2023
232024PANDF
3, Scotts Road, Ub2 5dd
Rear extension
Withdrawn
Jun 2023
231853PALHE
3, Scotts Road, Ub2 5dd
Two-storey extension
Refused
Jun 2023
231854HH
10, Montague Road, Ub2 5pb
Two-storey extension
Approved
May 2023
231357HH
10, Montague Road, Ub2 5pb
Rear extension
Not needed / lawful
May 2023
231328PALHE
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.