What you could build at BR4 9EA: 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 Hayes South & Coney Hall, Bromley.
38extensions seen within 600 m in the last 10 years
2loft conversions within 600 m in the last 10 years
91.4extensions 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 Hayes South & Coney Hall.
Move to a home 20 m² bigger (about £826,000)
Stamp duty on the new home
£31,300
Estate agent on yours 1.2% + VAT
£10,080
Solicitors, buying and selling
£3,000
Survey
£600
Removals
£1,500
Money gone
£46,480
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
−£75,600
Money gone
−£18,100
On these figures, extending loses about £64,580 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.
Refused
Mar 2025
25/00122/FULL6
7, Lime Tree Walk, Br4 9eb
Two-storey extension
Approved
Mar 2025
25/00103/FULL6
37, Harvest Bank Road, Br4 9dl
Two-storey extension
Approved
Mar 2025
25/00032/FULL6
158, Queensway, Br4 9dz
Two-storey extension
Approved
Nov 2024
24/03616/FULL6
96, Kingsway, Br4 9jq
Loft or dormer
Refused
Dec 2024
24/03163/FULL6
143, Queensway, Br4 9du
Two-storey extension
Approved
Oct 2024
24/03142/FULL6
32, Cherry Tree Walk, Br4 9ef
Outbuilding or garden room
Approved
Aug 2024
24/02348/FULL6
47, Cherry Tree Walk, Br4 9ee
Loft or dormer
Approved
Aug 2024
24/02271/FULL6
226, Queensway, Br4 9ea
Two-storey extension
Approved
Jul 2024
24/01268/FULL6
24, Cherry Tree Walk, Br4 9ef
Rear extension
Approved
May 2024
24/00572/FULL6
37, Hartfield Crescent, Br4 9dw
Loft or dormer
Approved
Apr 2024
24/00498/FULL6
98, Gates Green Road, Br4 9dg
Two-storey extension
Approved
Apr 2024
24/00484/FULL6
24, Cherry Tree Walk, Br4 9ef
Rear extension
Not needed / lawful
Dec 2023
23/04200/HHPA
47, Cherry Tree Walk, Br4 9ee
Loft or dormer
Refused
Oct 2023
23/03225/FULL6
79, Gates Green Road, Br4 9de
Rear extension
Approved
Sept 2023
23/02899/FULL6
105, Queensway, Br4 9dt
Loft or dormer
Approved
Sept 2023
23/02823/FULL6
82, Queensway, Br4 9dy
Loft or dormer
Refused
Sept 2023
23/02754/FULL6
12, Cherry Tree Walk, Br4 9ef
Rear extension
Approved
Sept 2023
23/02654/FULL6
202, Queensway, Br4 9ea
Loft or dormer
Approved
Aug 2023
23/02403/FULL6
91, Queensway, Br4 9dt
Two-storey extension
Approved
Aug 2023
23/02034/FULL6
66, Cherry Tree Walk, Br4 9eh
Other householder work
Approved
Jul 2023
23/01802/FULL6
121, Birch Tree Avenue, Br4 9eq
Two-storey extension
Approved
Jun 2023
23/01724/FULL6
86, Birch Tree Avenue, Br4 9el
Rear extension
Approved
May 2023
23/01237/FULL6
48, Lime Tree Walk, Br4 9ed
Loft or dormer
Approved
Jun 2023
23/00671/FULL6
21, Lime Tree Walk, Br4 9eb
Rear extension
Approved
Apr 2023
23/00615/FULL6
17, Cherry Tree Walk, Br4 9ee
Loft or dormer
Refused
Apr 2023
23/00543/FULL6
80, Queensway, Br4 9er
Rear extension
Approved
Mar 2023
23/00224/FULL6
48, Lime Tree Walk, Br4 9ed
Two-storey extension
Approved
Feb 2023
23/00031/FULL6
211, Queensway, Br4 9dx
Rear extension
Approved
Mar 2023
23/00013/FULL6
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.
100% (8)
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.