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What can I build, and will it pay? The planning rules, what neighbours have built, planning decisions, energy upgrades, and whether extending pays.
| Chislehurst West & Elmstead | Bromley | England and Wales | |
|---|---|---|---|
| Postcodes in a conservation area | 50% | 9% | 10% |
| Postcodes under an Article 4 direction | 0% | 0% | 16% |
| Listed buildings | 36 | 5 | 12 |
| Postcodes in a tree preservation order zone | 0% | 0% | 3% |
| Flats | 22% | 30% | 22% |
| Building | Grade | Distance |
|---|---|---|
| Bonchester | II | 250 m |
| Elm Bank | II | 250 m |
| Derwent House | II | 280 m |
| Fairacre | II | 290 m |
| Folly to North of Morland House | II | 350 m |
| Folly to West of Morland House | II | 360 m |
| C18 Folly in the Grounds of Camden Place | II | 530 m |
| the Cedars | II | 540 m |
| Water trough at junction of Old Hill and Bromley Road | II | 560 m |
| Camden Place | II* | 620 m |
| Parkmore | II | 660 m |
| Copley Dene | II | 670 m |
Nearest 12 shown. Grade I and II* are the most important few per cent. Listing means consent is needed for most changes, inside and out. Contains Historic England data © Historic England 2026 (via planning.data.gov.uk), OGL.
planning.data.gov.uk (OGL), Historic England. The rules at one address are on its postcode's Improving page. General guidance, not planning advice.
| Home | Work | Seen | Space added | Rooms |
|---|---|---|---|---|
| 27, Lubbock Road | Extension | 2026 | +29 m² | 4 → 6 |
| 13, Greatwood | Extension | 2026 | +23 m² | – |
| 38, Yester Road | Extension | 2026 | +70 m² | 7 → 8 |
| 50, Yester Road | Extension | 2026 | +22 m² | 4 → 5 |
| 3, Denbridge Road | Extension | 2026 | +34 m² | 12 → 10 |
| 19b, Denbridge Road | Extension | 2026 | +44 m² | – |
| 4, Alpine Copse | Extension | 2026 | +59 m² | 5 → 8 |
| Willow Cottage, Yester Road | Extension | 2026 | +36 m² | – |
| Inghays, Yester Road | Extension | 2026 | +128 m² | – |
| Newlands, South Hill | Extension | 2026 | +189 m² | 5 → 10 |
| Work | Chislehurst West & Elmstead | Bromley | London |
|---|---|---|---|
| All householder applications | 77% (251) | 79% (3770) | 80% |
| Basement | – | 77% (26) | 83% |
| Porch or front extension | – | 92% (94) | 81% |
| Garage conversion or garage | 67% (12) | 85% (123) | 88% |
| Loft or dormer | 78% (91) | 73% (1144) | 81% |
| Other householder work | 62% (26) | 54% (294) | 70% |
| Outbuilding or garden room | 100% (10) | 83% (107) | 79% |
| Rear extension | 89% (45) | 89% (1056) | 79% |
| Side extension | 100% (12) | 93% (144) | 86% |
| Side return or wrap-around | – | 94% (154) | 88% |
| Two-storey extension | 63% (38) | 70% (543) | 72% |
| Windows, doors or cladding | 67% (6) | 85% (85) | 90% |
Householder applications decided since 2023 (number decided in brackets); withdrawn ones aren't counted. GLA Planning London Datahub.
| Chislehurst West & Elmstead | Bromley | England and Wales | |
|---|---|---|---|
| Rated A or B | 13% | 8% | 12% |
| Rated E, F or G | 21% | 20% | 16% |
| Homes on mains gas | 95% | 93% | 86% |
| Gas use per home (kWh a year) | 19,585 | 13,468 | 11,043 |
| Households in fuel poverty | 5% | 8% | 10% |
| Homes built before 1919 | 13% | 16% | 20% |
A home's own recommended upgrades and their costs are on its energy certificate, shown on its page.
MHCLG energy certificates; DESNZ fuel poverty.
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); in London, 15.1% (15,951 resales).
Rough build costs and resale evidence, not quotes or a valuation. How extensions pay off by size, type and region.
The money you don't get back either way, for the same extra space in Chislehurst West & Elmstead.
| 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 |
| 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.
Where people extend most, and where the planning rules are tighter.
| 5, Rosedale Corner |
|---|
| Extension |
| 2025 |
| +11 m² |
| 5 → 4 |
| Flat 1, 29, Old Hill | Extension | 2025 | +15 m² | – |
|---|
| 153, Lower Camden | Extension | 2025 | +31 m² | – |
|---|
| High Timber, Chislehurst Road | Extension | 2025 | +80 m² | 9 → 9 |
|---|
| 7, Cromlix Close | Extension | 2025 | +17 m² | 6 → 6 |
|---|
| Shelburne, Yester Park | Extension | 2025 | +11 m² | 7 → 8 |
|---|
| Carpenters Lodge, St Nicolas Lane | Extension | 2025 | +83 m² | 10 → 10 |
|---|
| 109, Lubbock Road | Extension | 2024 | +11 m² | 9 → 9 |
|---|
| 113, Lubbock Road | Extension | 2024 | +23 m² | 8 → 8 |
|---|
| Shanzu, Raggleswood | Extension | 2024 | +77 m² | 7 → 9 |
|---|
| 6, Lower Camden | Extension | 2024 | +62 m² | 5 → 7 |
|---|
| 6, Davema Close | Extension | 2024 | +59 m² | 8 → 10 |
|---|
| Walsingham Lodge, Woodlands Road | Extension | 2024 | +36 m² | 5 → 7 |
|---|
| Huntington Place, Chislehurst Road | Extension | 2024 | +279 m² | – |
|---|
| 45, Chislehurst Road | Extension | 2024 | +103 m² | 6 → 6 |
|---|
| 45, Chislehurst Road | Loft conversion | 2024 | +103 m² | 6 → 6 |
|---|
| 12, Norlands Crescent | Extension | 2024 | +64 m² | 8 → 11 |
|---|
| Orchard End, Yester Park | Extension | 2024 | +122 m² | – |
|---|
| Coopers Cob, Willow Grove | Extension | 2024 | +42 m² | 9 → 9 |
|---|
| 2, Davema Close | Extension | 2023 | +30 m² | – |
|---|
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.
From energy certificates: an extension where a later certificate shows more floor space, a loft conversion where roof rooms appear.
Sort by any column; open a neighbourhood for the same view.
| Neighbourhood | Council | England and Wales | |
|---|---|---|---|
| Homes with solar panels | 0.6% | 0.7% | 1.2% |
| Heated by a heat pump | 1.0% | 0.4% | 1.0% |
| Mains gas | 93.7% | 90.9% | 84.0% |
| Oil or LPG | 0.1% | 0.2% | 4.1% |
| Electric heating | 4.8% | 6.3% | 8.3% |
| Community heating | 0.0% | 2.1% | 2.1% |
From each home's latest energy certificate, so panels or heat pumps fitted since aren't counted and the shares are lower than today's real figures. Compare areas in the data explorer.