Loft conversions and dormers in Windsor
2,423 applications since 2020. 1,469 approved and 459 refused. Refused: about 1 in 4 here, about 1 in 6 across the councils we cover.
Last updated 8 November 2026.
Without planning permission
- Up to 40 cubic metres of extra roof space on a terrace, 50 on a semi or detached house
- Not on the roof slope facing a road, and no higher than the existing roof
- Materials similar in appearance, set back about 0.2 m from the eaves, and side windows obscure-glazed
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 | 272 | 55 | 19 |
| 2025 | 357 | 188 | 110 |
| 2024 | 334 | 212 | 96 |
| 2023 | 330 | 233 | 64 |
| 2022 | 398 | 305 | 72 |
| 2021 | 382 | 206 | 42 |
| 2020 | 350 | 270 | 56 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Runnymede | 805 | 152 | about 1 in 6 |
| Slough | 679 | 132 | about 1 in 6 |
| Spelthorne | 920 | 214 | about 1 in 5 |
| Surrey Heath | 589 | 108 | about 1 in 6 |