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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.
| Walnut Tree & Tilbrook | Milton Keynes | England and Wales | |
|---|---|---|---|
| Postcodes in a conservation area | 0% | 5% | 10% |
| Postcodes under an Article 4 direction | 100% | 100% | 16% |
| Listed buildings | 0 | 10 | 12 |
| Postcodes in a tree preservation order zone | 0% | 11% | 3% |
| Flats | 14% | 18% | 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 |
|---|---|---|---|---|
| 11, Rosebay Close | Extension | 2026 | +22 m² | 5 → 6 |
| 8, Harebell Close | Extension | 2026 | +21 m² | 7 → 5 |
| 2, Sandbrier Close | Extension | 2026 | +42 m² | 7 → 6 |
| 66, Pimpernel Grove | Extension | 2026 | +12 m² | 4 → 5 |
| 10, Meadowsweet | Extension | 2025 | +18 m² | 8 → 8 |
| 23, Meadowsweet | Extension | 2025 | +14 m² | 6 → 6 |
| 15, Tallis Lane | Loft conversion | 2025 | – | 2 → 2 |
| 52, Bantock Close | Extension | 2025 | +28 m² | 4 → 6 |
| 7, Caraway Close | Extension | 2025 | +28 m² | – |
| 3, Cranberry Close | Extension | 2025 | +13 m² | 8 → 7 |
Planning applications outside London aren't published as open data yet, so search the council's own register: the drawings, the decision and the agent are there. Find the council's planning register on GOV.UK ↗
| Walnut Tree & Tilbrook | Milton Keynes | England and Wales | |
|---|---|---|---|
| Rated A or B | 10% | 20% | 12% |
| Rated E, F or G | 3% | 6% | 16% |
| Homes on mains gas | 87% | 91% | 86% |
| Gas use per home (kWh a year) | 10,594 | 11,089 | 11,043 |
| Households in fuel poverty | 5% | 6% | 10% |
| Homes built before 1919 | 0% | 6% | 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 South East, 13.4% (24,181 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 Walnut Tree & Tilbrook.
| Stamp duty on the new home | £12,600 |
|---|---|
| Estate agent on yours 1.2% + VAT | £5,184 |
| Solicitors, buying and selling | £3,000 |
| Survey | £600 |
| Removals | £1,500 |
| Money gone | £22,884 |
| Building, plus 15% for design, planning and contingency | £57,500 |
|---|---|
| Less what it adds to your home's value 60% of the local price | −£55,200 |
| Money gone | £2,300 |
On these figures, extending loses about £20,584 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.
| Extension |
| 2025 |
| +37 m² |
| – |
| 1, Bruckner Gardens | Extension | 2025 | +10 m² | 4 → 4 |
|---|
| 111, Pettingrew Close | Extension | 2025 | +9 m² | 4 → 4 |
|---|
| 91, Studley Knapp | Extension | 2025 | +40 m² | 10 → 10 |
|---|
| 5, Mahler Close | Loft conversion | 2024 | +2 m² | 3 → 3 |
|---|
| 8, Mendelssohn Grove | Extension | 2024 | +50 m² | 4 → 7 |
|---|
| 38, Parsley Close | Extension | 2024 | +167 m² | 5 → 5 |
|---|
| 30, Dunchurch Dale | Extension | 2024 | +24 m² | – |
|---|
| 5, Arne Lane | Extension | 2024 | +33 m² | – |
|---|
| 31, Chase Avenue | Extension | 2024 | +10 m² | 5 → 5 |
|---|
| 9, Gaddesden Crescent | Extension | 2024 | +16 m² | 6 → 7 |
|---|
| 6, Gaddesden Crescent | Loft conversion | 2024 | +1 m² | 4 → 4 |
|---|
| 28, Gabriel Close | Extension | 2023 | +29 m² | 4 → 5 |
|---|
| 39, Sullivan Crescent | Extension | 2023 | +16 m² | 5 → 5 |
|---|
| 7, Rubbra Close | Extension | 2023 | +17 m² | 5 → 5 |
|---|
| 12, Sandbrier Close | Extension | 2023 | +90 m² | – |
|---|
| 2, Balsam Close | Extension | 2023 | +24 m² | – |
|---|
| 9, Bellini Close | Extension | 2023 | +11 m² | 4 → 4 |
|---|
| 34, Harebell Close | Extension | 2022 | +13 m² | 4 → 5 |
|---|
| 11, Britten Grove | Extension | 2022 | +10 m² | 7 → 7 |
|---|
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 | 0.9% | 1.2% | 1.2% |
| Heated by a heat pump | 0.2% | 0.5% | 1.0% |
| Mains gas | 86.5% | 90.4% | 84.0% |
| Oil or LPG | 0.1% | 0.9% | 4.1% |
| Electric heating | 11.7% | 6.0% | 8.3% |
| Community heating | 1.6% | 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.