What you could build at BR2 8BB: 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 Bickley East, Bromley.
60extensions seen within 600 m in the last 10 years
2loft conversions within 600 m in the last 10 years
107.4extensions 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 Bickley East.
Move to a home 20 m² bigger (about £857,000)
Stamp duty on the new home
£32,850
Estate agent on yours 1.2% + VAT
£10,512
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£48,462
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
−£76,200
Money gone
−£18,700
On these figures, extending loses about £67,162 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.
27, The Vines, Highfield Road, Br1 2jn
Rear extension
Not needed / lawful
Jun 2025
25/01611/HHPA
44, Holmcroft Way, Br2 8ad
Rear extension
Approved
Jun 2025
25/01289/FULL6
5, Claremont Road, Br1 2jl
Loft or dormer
Under consideration
–
25/01291/FULL6
264, Southborough Lane, Br2 8as
Rear extension
Not needed / lawful
Jun 2025
25/01500/HHPA
38, Homemead Road, Br2 8ba
Side return or wrap-around
Approved
May 2025
25/00889/FULL6
45, Springfield Gardens, Br1 2ly
Side extension
Approved
May 2025
25/00711/FULL6
5, Oldfield Close, Br1 2ll
Loft or dormer
Approved
Apr 2025
25/00505/FULL6
86, Southborough Road, Br1 2en
Loft or dormer
Approved
Apr 2025
25/00418/FULL6
9, Highfield Road, Br1 2jn
Loft or dormer
Approved
Mar 2025
25/00138/FULL6
4, Cranford Mews, Br2 8ga
Outbuilding or garden room
Approved
Feb 2025
24/04782/FULL6
5, Springfield Gardens, Br1 2ly
Rear extension
Approved
Apr 2025
24/04583/FULL6
5, Oldfield Close, Br1 2ll
Loft or dormer
Refused
Jan 2025
24/04421/FULL6
5, Claremont Road, Br1 2jl
Loft or dormer
Refused
Feb 2025
24/04066/FULL6
277, Southborough Lane, Br2 8bg
Loft or dormer
Approved
May 2025
24/04267/FULL6
23, Holmcroft Way, Br2 8ad
Outbuilding or garden room
Approved
Nov 2024
24/02382/FULL6
5, Springfield Gardens, Br1 2ly
Loft or dormer
Refused
Nov 2024
24/03375/FULL6
25, Holmcroft Way, Br2 8ad
Two-storey extension
Refused
Jan 2025
24/03162/FULL6
44, Southwood Close, Br1 2lu
Rear extension
Not needed / lawful
Sept 2024
24/02963/HHPA
137, Southborough Lane, Br2 8ap
Rear extension
Approved
Oct 2024
24/03061/FULL6
137, Southborough Lane, Br2 8ap
Rear extension
Not needed / lawful
Sept 2024
24/03063/HHPA
283, Southborough Lane, Br2 8bg
Loft or dormer
Refused
Sept 2024
24/03007/FULL6
276, Southborough Lane, Br2 8as
Rear extension
Not needed / lawful
Jul 2024
24/02099/HHPA
13, Highfield Road, Br1 2jn
Rear extension
Approved
Jul 2024
24/02040/FULL6
24, Fairmead, Br1 2ju
Rear extension
Approved
Jul 2024
24/01972/FULL6
21, Holbrook Way, Br2 8ef
Rear extension
Approved
Jul 2024
24/01868/FULL6
14, The Fairway, Br1 2jy
Loft or dormer
Approved
Jun 2024
24/01648/FULL6
287, Southborough Lane, Br2 8bg
Loft or dormer
Approved
Jul 2024
24/01640/FULL6
46, Sunray Avenue, Br2 8ew
Rear extension
Approved
Jun 2024
24/01444/FULL6
23, Cloisters Avenue, Br2 8an
Two-storey extension
Approved
May 2024
24/00879/FULL6
39, Homemead Road, Br2 8bb
Rear extension
Approved
Apr 2024
24/00756/FULL6
15, Cloisters Avenue, Br2 8an
Loft or dormer
Approved
Apr 2024
24/00621/FULL6
7, Woodside Road, Br1 2es
Loft or dormer
Refused
Apr 2024
24/00536/FULL6
25, Holmcroft Way, Br2 8ad
Rear extension
Not needed / lawful
Mar 2024
24/00416/HHPA
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.
–
85% (123)
88%
8 weeks
Basement
–
77% (26)
83%
9 weeks
Porch or front extension
–
92% (94)
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.