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Improving at BR7 6AB

What you could build at BR7 6AB: 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 Chislehurst West & Elmstead, Bromley.

74extensions seen within 600 m in the last 10 years

2loft conversions within 600 m in the last 10 years

70%of 64 householder applications nearby approved (since 2023)

129.1extensions 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.
In the Chislehurst 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.

What neighbours have built

Home	Work	Seen	Space added	Floor area	Rooms	Distance
7, The Meadow	Extension	2026	+281 m²	149 m² → 430 m²	6 → 7	105 m
19, Roehampton Drive	Extension	2026	+16 m²	107 m² → 123 m²	5 → 6	245 m
80, Woodside Avenue	Extension	2026	+29 m²	112 m² → 141 m²	–	297 m
23, Camden Grove	Extension	2026	+61 m²	104 m² → 165 m²	–	409 m
70, Holmdale Road	Extension	2026	+22 m²	76 m² → 98 m²	–	455 m
80, Holmdale Road	Extension	2026	+9 m²	82 m² → 91 m²	4 → 6	455 m

Planning applications nearby

Address	Work	Outcome	Decided	Drawings and agent
57, Holmdale Road, Br7 6by	Loft or dormer	Under consideration	–	25/02026/FULL6
10, Nursery Gardens, Br7 5bw	Rear extension	Approved	Jul 2025	25/01607/FULL6
Dorrington, Mead Road, Br7 6ad	Two-storey extension	Refused	Jun 2025	25/01221/FULL6
13, Green Lane, Br7 6ag	Garage conversion or garage	Under consideration	–	25/01442/FULL6
96, Woodside Avenue, Br7 6bs	Rear extension	Approved	Jun 2025	25/01022/FULL6
2, Woodside Avenue, Br7 6bu	Two-storey extension	Approved	May 2025	25/00940/FULL6
39, Woodside Avenue, Br7 6bx	Loft or dormer	Approved	May 2025	25/00818/FULL6

How often householder applications are approved

Work	Chislehurst West & Elmstead	Bromley	London	Typical decision time
All householder applications	77% (251)	79% (3770)	80%	8 weeks
Loft or dormer	78% (91)	73% (1144)	81%	8 weeks
Rear extension	89% (45)	89% (1056)	79%	8 weeks
Two-storey extension	63% (38)	70% (543)	72%	8 weeks
Other householder work	62% (26)	54% (294)	70%	8 weeks
Side return or wrap-around	–	94% (154)	88%	8 weeks
Windows, doors or cladding	67% (6)	85% (85)	90%	8 weeks
Outbuilding or garden room	100% (10)	83% (107)	79%	8 weeks
Side extension	100% (12)	93% (144)	86%	8 weeks

Cost and the value it adds

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 Chislehurst West & Elmstead.

Your home is worthExtra space you need (m²)Homes here sell for, per m²Building cost per m²Share of that an extension adds (%)

Move to a home 20 m² bigger (about £910,000)

Stamp duty on the new home	£35,500
Estate agent on yours 1.2% + VAT	£11,304
Solicitors, buying and selling	£3,000
Survey	£600
Removals	£1,500
Money gone	£51,904

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	−£75,000
Money gone	−£17,500

On these figures, extending loses about £69,404 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.

Find help: RIBA Find an Architect ↗ · CIAT architectural technologists ↗ · TrustMark tradespeople ↗ · Federation of Master Builders ↗ · Planning Portal guides ↗

General guidance, not planning or legal advice. Fees and rules as checked in October 2026; confirm with the council.

Energy certificates: MHCLG (OGL). Planning applications: GLA Planning London Datahub. Conservation areas and Article 4: planning.data.gov.uk (OGL).

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Improving at BR7 6AB

The rules at this address

What neighbours have built

Planning applications nearby

How often householder applications are approved

Cost and the value it adds

Move or improve?

Getting started

Go deeper

Improving at BR7 6AB

BR7 6AB is on Heathley End

The rules at this address

What neighbours have built

Planning applications nearby

How often householder applications are approved

Cost and the value it adds

Move or improve?

Getting started

Go deeper

BR7 6AB is on Heathley End