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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.
| Harold Hill West | Havering | England and Wales | |
|---|---|---|---|
| Postcodes in a conservation area | 0% | 2% | 10% |
| Postcodes under an Article 4 direction | 0% | 0% | 16% |
| Listed buildings | 0 | 3 | 12 |
| Postcodes in a tree preservation order zone | 0% | 0% | 3% |
| Flats | 25% | 23% | 22% |
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 |
|---|---|---|---|---|
| 18, Heaton Close | Extension | 2026 | +32 m² | – |
| 80, Harrow Crescent | Extension | 2026 | +8 m² | 3 → 4 |
| 58, Coleridge Road | Extension | 2026 | +19 m² | 5 → 5 |
| 48, Briar Road | Extension | 2026 | +8 m² | 4 → 6 |
| 14, Ruskin Gardens | Extension | 2026 | +30 m² | – |
| 139, Briar Road | Extension | 2026 | +22 m² | – |
| 232, Straight Road | Extension | 2026 | +9 m² | 5 → 4 |
| 1, Gascoyne Close | Extension | 2026 | +23 m² | 4 → 5 |
| 1a, Grange Road | Extension | 2026 | +24 m² | – |
| 217, Main Road | Extension | 2026 | +131 m² | 5 → 5 |
| Work | Harold Hill West | Havering | London |
|---|---|---|---|
| All householder applications | 47% (17) | 54% (895) | 80% |
| Rear extension | 50% (10) | 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Householder applications decided since 2023 (number decided in brackets); withdrawn ones aren't counted.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.
| Harold Hill West | Havering | England and Wales | |
|---|---|---|---|
| Rated A or B | 4% | 9% | 12% |
| Rated E, F or G | 13% | 18% | 16% |
| Homes on mains gas | 96% | 92% | 86% |
| Gas use per home (kWh a year) | 10,135 | 11,589 | 11,043 |
| Households in fuel poverty | 8% | 8% | 10% |
| Homes built before 1919 | 0% | 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 Harold Hill West.
| Stamp duty on the new home | £14,950 |
|---|---|
| Estate agent on yours 1.2% + VAT | £5,760 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £25,810 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£59,400 |
| Money gone | −£1,900 |
On these figures, extending loses about £27,710 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 | 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 (this one) | 14.3 | 0% | 0% | 0 | 4% |
| Extension |
| 2025 |
| +79 m² |
| 5 → 7 |
| 22, Byron Way | Loft conversion | 2025 | – | 5 → 4 |
|---|
| 69a, Harrow Crescent | Extension | 2025 | +37 m² | 5 → 5 |
|---|
| 16, Mimosa Close | Extension | 2025 | +18 m² | – |
|---|
| 4, Briar Road | Extension | 2025 | +29 m² | 4 → 5 |
|---|
| 14, Barberry Close | Extension | 2025 | +18 m² | 4 → 5 |
|---|
| 87, Coltsfoot Path | Extension | 2025 | +75 m² | – |
|---|
| 7, Widecombe Close | Extension | 2025 | +40 m² | – |
|---|
| 92, Links Avenue | Extension | 2025 | +47 m² | 5 → 7 |
|---|
| 55, Gillian Crescent | Loft conversion | 2025 | +74 m² | 8 → 9 |
|---|
| 36, Gillian Crescent | Extension | 2025 | +58 m² | 4 → 5 |
|---|
| 29, Heaton Avenue | Extension | 2024 | +38 m² | 4 → 4 |
|---|
| 75, Straight Road | Extension | 2024 | +111 m² | 3 → 7 |
|---|
| 3, Charlbury Crescent | Extension | 2024 | +8 m² | 4 → 5 |
|---|
| 69, Charlbury Crescent | Extension | 2024 | +30 m² | – |
|---|
| 2, Farnes Drive | Extension | 2024 | +119 m² | 6 → 9 |
|---|
| 2, Farnes Drive | Loft conversion | 2024 | +119 m² | 6 → 9 |
|---|
| 17, Heaton Avenue | Extension | 2023 | +18 m² | 6 → 9 |
|---|
| 6, Heaton Avenue | Extension | 2023 | +23 m² | – |
|---|
| 57, Straight Road | Extension | 2023 | +12 m² | 5 → 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 | 1.1% | 1.0% | 1.2% |
| Heated by a heat pump | 0.0% | 0.3% | 1.0% |
| Mains gas | 95.6% | 91.0% | 84.0% |
| Oil or LPG | 0.1% | 0.1% | 4.1% |
| Electric heating | 3.7% | 6.5% | 8.3% |
| Community heating | 0.6% | 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.