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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.
| Erith West | Bexley | England and Wales | |
|---|---|---|---|
| Postcodes in a conservation area | 3% | 2% | 10% |
| Postcodes under an Article 4 direction | 0% | 0% | 16% |
| Listed buildings | 2 | 2 | 12 |
| Postcodes in a tree preservation order zone | 0% | 0% | 3% |
| Flats | 35% | 24% | 22% |
| Building | Grade | Distance |
|---|---|---|
| Bexley College (Former Erith Technical Institute) Including Attached Walls Railings and Gatepiers | II | 350 m |
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 |
|---|---|---|---|---|
| 70, Erith Road | Extension | 2026 | +24 m² | – |
| 15, Tower Road | Extension | 2026 | +32 m² | – |
| 24, Oakdene Avenue | Extension | 2026 | +21 m² | – |
| 202, Brook Street | Extension | 2026 | +21 m² | – |
| 24, Sandcliff Road | Extension | 2026 | +12 m² | 4 → 5 |
| 106, Hengist Road | Extension | 2026 | +16 m² | 5 → 4 |
| 48, Ashburnham Road | Extension | 2026 | +15 m² | 4 → 7 |
| 14, Parsonage Manorway | Extension | 2026 | +38 m² | – |
| 24, Mayfield Road | Extension | 2026 | +23 m² | 4 → 5 |
| 15, Bullbanks Road | Extension | 2026 | +24 m² | – |
| 3, Egerton Close |
| Work | Erith West | Bexley | London |
|---|---|---|---|
| All householder applications | 72% (18) | 78% (1176) | 80% |
| Porch or front extension | – | 81% (16) | 81% |
| Garage conversion or garage | – | 81% (67) | 88% |
| Loft or dormer | 88% (8) | 92% (524) | 81% |
| Other householder work | – | 68% (63) | 70% |
| Outbuilding or garden room | – | 89% (72) | 79% |
| Rear extension | 40% (5) | 52% (347) | 79% |
| Side extension | – | 85% (26) | 86% |
| Side return or wrap-around | – | 87% (15) | 88% |
| Two-storey extension | – | 91% (42) | 72% |
| Basement | – | – | 83% |
| Windows, doors or cladding | – | – | 90% |
Householder applications decided since 2023 (number decided in brackets); withdrawn ones aren't counted. GLA Planning London Datahub.
| Erith West | Bexley | England and Wales | |
|---|---|---|---|
| Rated A or B | 21% | 8% | 12% |
| Rated E, F or G | 15% | 19% | 16% |
| Homes on mains gas | 77% | 90% | 86% |
| Gas use per home (kWh a year) | 11,509 | 12,160 | 11,043 |
| Households in fuel poverty | 8% | 8% | 10% |
| Homes built before 1919 | 19% | 11% | 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 Erith West.
| Stamp duty on the new home | £12,700 |
|---|---|
| Estate agent on yours 1.2% + VAT | £5,328 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £23,128 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£50,400 |
| Money gone | £7,100 |
On these figures, extending loses about £16,028 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.
| Longlands & Halfway | 43.0 | 0% | 0% | 1 | 5% |
|---|---|---|---|---|---|
| Bostall | 37.5 | 0% | 0% | 0 | 1% |
| Danson Park | 33.9 | 0% | 0% | 10 | 1% |
| Bexley Village | 30.5 | 22% | 0% | 22 | 9% |
| Bursted Wood | 29.9 | 0% | 0% | 0 | 1% |
| Lamorbey | 28.9 | 12% | 0% | 3 | 2% |
| St Michael's | 28.8 | 0% | 0% | 2 | 2% |
| Blackfen | 27.8 | 2% | 0% | 2 | 2% |
| Albany Park | 25.9 | 0% | 0% | 2 | 1% |
| Welling | 25.1 | 0% | 0% | 1 | 5% |
| Barnehurst South | 24.9 | 0% | 0% | 4 | 8% |
| Falconwood | 24.6 | 0% | 0% | 0 | 3% |
| Foots Cray Meadows | 23.4 | 12% | 0% | 18 | 4% |
| Sidcup East | 22.5 | 2% | 0% | 7 | 8% |
| Barnehurst North | 21.8 | 0% | 0% | 0 | 1% |
| Lesnes Abbey | 19.8 | 1% | 0% | 0 | 1% |
| Sidcup West | 19.7 | 10% | 0% | 6 | 9% |
| Bexleyheath Broadway | 17.1 | 0% | 0% | 5 | 24% |
| South Thamesmead | 16.6 | 0% | 0% | 1 | 21% |
| Belvedere & Lessness Heath | 15.5 | 2% | 0% | 1 | 8% |
| Northumberland Heath | 14.1 | 1% | 0% | 0 | 1% |
| Crayford | 13.9 | 3% | 0% | 13 | 11% |
| Lesney Farm & Colyers East | 13.2 | 0% | 0% | 0 | 14% |
| Slade Green & Crayford Marshes | 12.4 | 1% | 0% | 2 | 28% |
| Erith East | 11.4 | 3% | 0% | 6 | 16% |
| Wickham Street & East Wickham | 10.9 | 0% | 0% | 1 | 4% |
| Crossway Park | 10.8 | 0% | 0% | 3 | 1% |
| Erith West (this one) | 9.7 | 3% | 0% | 2 | 21% |
| Extension |
| 2025 |
| +13 m² |
| – |
| 72, Pembroke Road | Extension | 2025 | +70 m² | 5 → 6 |
|---|
| 26, Oakdene Avenue | Extension | 2025 | +26 m² | 3 → 3 |
|---|
| 36, Bramble Croft | Extension | 2025 | +31 m² | 4 → 6 |
|---|
| 11, Cavendish Avenue | Extension | 2025 | +35 m² | 4 → 4 |
|---|
| 24, Fremantle Road | Extension | 2025 | +76 m² | – |
|---|
| 5, Bramble Croft | Extension | 2024 | +17 m² | 4 → 5 |
|---|
| 23, Meyer Road | Loft conversion | 2024 | +2 m² | 5 → 4 |
|---|
| 14, Heathdene Drive | Extension | 2024 | +11 m² | 4 → 5 |
|---|
| 4, Ward Close | Extension | 2024 | +11 m² | 5 → 5 |
|---|
| Flat 14, Newnham Lodge, 19, Erith Road | Extension | 2024 | +20 m² | – |
|---|
| 220, Park Crescent | Extension | 2024 | +12 m² | 5 → 6 |
|---|
| 56, Mayfield Road | Extension | 2024 | +20 m² | – |
|---|
| 3, Bullbanks Road | Extension | 2024 | +10 m² | 4 → 4 |
|---|
| Windy Ridge, Fremantle Road | Extension | 2024 | +219 m² | 4 → 7 |
|---|
| 20, Battle Road | Extension | 2024 | +15 m² | – |
|---|
| 22, Battle Road | Extension | 2024 | +25 m² | – |
|---|
| 62, Holly Hill Road | Extension | 2023 | +34 m² | – |
|---|
| 199, Riverdale Road | Extension | 2023 | +15 m² | 4 → 5 |
|---|
| 58, Pembroke Road | Extension | 2023 | +17 m² | 2 → 5 |
|---|
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 | 0.5% | 0.5% | 1.2% |
| Heated by a heat pump | 13.2% | 0.7% | 1.0% |
| Mains gas | 74.6% | 88.3% | 84.0% |
| Oil or LPG | 0.1% | 0.1% | 4.1% |
| Electric heating | 11.8% | 8.5% | 8.3% |
| Community heating | 0.3% | 2.4% | 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.