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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.
| Rainham West | Havering | England and Wales | |
|---|---|---|---|
| Postcodes in a conservation area | 9% | 2% | 10% |
| Postcodes under an Article 4 direction | 0% | 0% | 16% |
| Listed buildings | 12 | 3 | 12 |
| Postcodes in a tree preservation order zone | 0% | 0% | 3% |
| Flats | 24% | 23% | 22% |
| Building | Grade | Distance |
|---|---|---|
| Wall and Gate Piers to Rainham Hall Between Number 15 and 37 | II | 390 m |
| 2-8, Upminster Road South | II | 430 m |
| Stable Block at Rainham Hall | II* | 440 m |
| Rainham Hall | II* | 460 m |
| the Lodge at Rainham Hall | II* | 460 m |
| Forecourt Railings, Gates and Piers Walls and Vases at Rainham Hall | II* | 480 m |
| Church of St Helen and St Giles | I | 490 m |
| Rainham War Memorial | II | 520 m |
| the Vicarage | II | 530 m |
| Redbury | II | 550 m |
| K6 Telephone Kiosk, Outside the Bell Public House | II | 560 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 |
|---|---|---|---|---|
| 17, Cowper Road | Extension | 2026 | +35 m² | – |
| 17, Cowper Road | Loft conversion | 2026 | +35 m² | 4 → 6 |
| 20, Melville Road | Extension | 2026 | +17 m² | 4 → 4 |
| 20, Melville Road | Loft conversion | 2026 | +17 m² | 4 → 4 |
| 48, Cowper Road | Extension | 2026 | +8 m² | 4 → 3 |
| 65, Ingrebourne Road | Extension | 2026 | +25 m² | 4 → 4 |
| 18, Regna Close | Extension | 2026 | +16 m² | – |
| 76, Brights Avenue | Extension | 2026 | +33 m² | – |
| 98, Penerley Road | Extension | 2026 | +108 m² | 4 → 9 |
| 138, Rothbury Avenue | Extension | 2026 | +25 m² | – |
| Work | Rainham West | Havering | London |
|---|---|---|---|
| All householder applications | 48% (23) | 54% (895) | 80% |
| Rear extension | 50% (14) | 57% (350) | 79% |
| Porch or front extension | – | 73% (15) | 81% |
| Garage conversion or garage | – | 64% (44) | 88% |
| Loft or dormer | – | 34% (147) | 81% |
| Other householder work | – | 51% (158) | 70% |
| Outbuilding or garden room | – | 45% (56) | 79% |
| Side extension | – | 71% (24) | 86% |
| Side return or wrap-around | – | 83% (12) | 88% |
| Two-storey extension | – | 66% (77) | 72% |
| Windows, doors or cladding | – | 92% (12) | 90% |
| Basement | – | – | 83% |
Householder applications decided since 2023 (number decided in brackets); withdrawn ones aren't counted. GLA Planning London Datahub.
| Rainham West | Havering | England and Wales | |
|---|---|---|---|
| Rated A or B | 8% | 9% | 12% |
| Rated E, F or G | 14% | 18% | 16% |
| Homes on mains gas | 91% | 92% | 86% |
| Gas use per home (kWh a year) | 10,762 | 11,589 | 11,043 |
| Households in fuel poverty | 8% | 8% | 10% |
| Homes built before 1919 | 9% | 5% | 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 Rainham West.
| Stamp duty on the new home | £17,450 |
|---|---|
| Estate agent on yours 1.2% + VAT | £6,408 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £28,958 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£62,400 |
| Money gone | −£4,900 |
On these figures, extending loses about £33,858 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.
| Emerson Park | 45.7 | 0% | 0% | 3 | 9% |
|---|---|---|---|---|---|
| Upminster North & Cranham West | 42.2 | 2% | 0% | 7 | 5% |
| Upminster South & Corbets Tey | 42.0 | 6% | 0% | 24 | 2% |
| Romford East | 39.5 | 1% | 0% | 1 | 4% |
| Upminster Bridge | 36.0 | 0% | 0% | 9 | 5% |
| Gidea Park | 35.3 | 25% | 0% | 11 | 8% |
| Hornchurch | 34.0 | 7% | 0% | 13 | 4% |
| Rise Park | 33.3 | 4% | 0% | 1 | 1% |
| Cranham East | 33.0 | 3% | 0% | 7 | 2% |
| Rainham East & Wennington | 31.2 | 0% | 0% | 4 | 9% |
| Ardleigh Green | 31.1 | 0% | 0% | 1 | 9% |
| Romford North West | 30.8 | 0% | 0% | 1 | 6% |
| Havering-atte-Bower & Chase Cross | 29.8 | 6% | 0% | 12 | 3% |
| Romford North | 29.4 | 0% | 0% | 0 | 1% |
| Hylands | 29.3 | 5% | 0% | 2 | 4% |
| Collier Row & Park Farm | 25.2 | 0% | 0% | 3 | 2% |
| Romford South | 23.2 | 0% | 0% | 0 | 9% |
| Elm Park East | 23.1 | 0% | 0% | 0 | 2% |
| Petersfield Avenue & Duck Wood | 22.8 | 0% | 0% | 1 | 15% |
| Harold Park & Harold Wood | 22.7 | 0% | 0% | 8 | 24% |
| Hacton | 22.7 | 0% | 0% | 0 | 16% |
| Rainham West (this one) | 22.3 | 9% | 0% | 12 | 8% |
| Rush Green | 22.2 | 0% | 0% | 3 | 19% |
| Central Romford | 20.6 | 2% | 0% | 10 | 17% |
| Hornchurch Marshes | 20.1 | 0% | 0% | 1 | 31% |
| Dagnam Park & Noak Hill | 19.0 | 0% | 0% | 8 | 20% |
| South Hornchurch | 18.7 | 0% | 0% | 2 | 2% |
| Harold Hill East | 17.8 | 0% | 0% | 0 | 5% |
| Elm Park West | 16.5 | 0% | 0% | 3 | 8% |
| Harold Hill West | 14.3 | 0% | 0% | 0 | 4% |
| Extension |
| 2026 |
| +17 m² |
| – |
| 28, The Glen | Extension | 2026 | +29 m² | 5 → 5 |
|---|
| 321, Upminster Road North | Extension | 2026 | +31 m² | – |
|---|
| 23, Cowper Road | Extension | 2025 | +18 m² | – |
|---|
| 70, Ingrebourne Road | Extension | 2025 | +12 m² | 6 → 5 |
|---|
| 268, Wennington Road | Extension | 2025 | +11 m² | 5 → 5 |
|---|
| 6, Penerley Road | Extension | 2025 | +32 m² | 2 → 4 |
|---|
| 1, Wentworth Way | Extension | 2025 | +62 m² | 5 → 6 |
|---|
| 3, Woodside Close | Extension | 2025 | +30 m² | – |
|---|
| 111, Lambs Lane South | Extension | 2025 | +113 m² | – |
|---|
| 23, Melville Road | Extension | 2024 | +38 m² | 5 → 7 |
|---|
| 23, Melville Road | Loft conversion | 2024 | +38 m² | 5 → 7 |
|---|
| 84, Melville Road | Extension | 2024 | +19 m² | – |
|---|
| 41, Findon Gardens | Extension | 2024 | +43 m² | 4 → 6 |
|---|
| 29, Ingrebourne Road | Extension | 2024 | +30 m² | – |
|---|
| 122, Upminster Road South | Extension | 2024 | +33 m² | 4 → 6 |
|---|
| 15, Brights Avenue | Extension | 2024 | +39 m² | 5 → 7 |
|---|
| 47, Lambs Lane South | Loft conversion | 2024 | – | 4 → 4 |
|---|
| 35c, South Hall Drive | Extension | 2024 | +11 m² | 2 → 2 |
|---|
| 34, Arterial Avenue | Loft conversion | 2024 | +7 m² | 5 → 4 |
|---|
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 | 1.1% | 1.0% | 1.2% |
| Heated by a heat pump | 0.1% | 0.3% | 1.0% |
| Mains gas | 91.0% | 91.0% | 84.0% |
| Oil or LPG | 0.1% | 0.1% | 4.1% |
| Electric heating | 8.8% | 6.5% | 8.3% |
| Community heating | 0.0% | 1.9% | 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.