Rear extensions in Slough
3,134 applications since 2020. 1,530 approved and 461 refused. Refused: about 1 in 4 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 | 348 | 104 | 48 |
| 2025 | 391 | 194 | 75 |
| 2024 | 457 | 213 | 99 |
| 2023 | 420 | 217 | 62 |
| 2022 | 409 | 214 | 59 |
| 2021 | 595 | 324 | 71 |
| 2020 | 514 | 264 | 47 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| M C S Design Architectural Services | 45 | 52 |
| Kvl designs Ltd | 43 | 63 |
| AW Architecture Ltd | 43 | 55 |
| Sa Associates | 43 | 47 |
| Arcadia Architects | 18 | 23 |
| Arcadia Designs Group Ltd | 18 | 19 |
| SK design Consultant | 11 | 13 |
| Zyntax Chartered Architects | 10 | 12 |
| AB Structural Designs Ltd | 9 | 12 |
| Art Consultants (UK) Ltd | 8 | 9 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Hillingdon | 33,066 | 10,210 | about 1 in 4 |
| Spelthorne | 2,046 | 347 | about 1 in 7 |