Rear extensions in Windsor
6,389 applications since 2020. 3,769 approved and 1,018 refused. Refused: about 1 in 5 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 | 636 | 112 | 25 |
| 2025 | 879 | 502 | 212 |
| 2024 | 856 | 507 | 219 |
| 2023 | 838 | 571 | 146 |
| 2022 | 981 | 706 | 147 |
| 2021 | 1,174 | 636 | 116 |
| 2020 | 1,025 | 735 | 153 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Runnymede | 2,034 | 335 | about 1 in 7 |
| Slough | 1,530 | 461 | about 1 in 4 |
| Spelthorne | 2,046 | 347 | about 1 in 7 |
| Surrey Heath | 2,095 | 301 | about 1 in 8 |