Rear extensions in Spelthorne
1,626 applications since 2023. 1,133 approved and 202 refused. Refused: about 1 in 7 here, about 1 in 7 across the councils we cover.
Last updated 9 November 2026.
Without planning permission
- Up to 3 m deep on a terrace or semi, 4 m on a detached house
- Up to 6 m or 8 m through the neighbour-consultation route, not on protected land
- No higher than 4 m, and eaves no higher than 3 m within 2 m of a boundary
- Together with other buildings, no more than half the garden and grounds
- Materials similar in appearance to the house
England, houses only. Flats, listed buildings, conservation areas and Article 4 directions change this. The full rules.
Year by year
| Year | Applications | Approved | Refused |
|---|---|---|---|
| 2026 | 302 | 203 | 35 |
| 2025 | 468 | 308 | 82 |
| 2024 | 435 | 312 | 46 |
| 2023 | 421 | 310 | 39 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| AJT Design Services Ltd | 98 | 99 |
| Dimensions- Planning&Architecture | 25 | 49 |
| Art Consultants (UK) Ltd | 18 | 19 |
| AsB Architecture Ltd | 12 | 12 |
| P H Design | 11 | 11 |
| Christopher David Design | 10 | 13 |
| The Market Design and Build | 9 | 9 |
| R S Designs | 8 | 12 |
| Hitchcock Architects Ltd | 8 | 9 |
| AH Architecture | 8 | 8 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Elmbridge | 8,859 | 2,260 | about 1 in 5 |
| Hillingdon | 33,066 | 10,210 | about 1 in 4 |
| Hounslow | 22,712 | 9,765 | about 1 in 3 |
| Richmond | 7,397 | 1,752 | about 1 in 5 |
| Runnymede | 2,034 | 335 | about 1 in 7 |
| Slough | 1,530 | 461 | about 1 in 4 |