Loft conversions and dormers in Slough
923 applications since 2020. 679 approved and 132 refused. Refused: about 1 in 6 here, about 1 in 6 across the councils we cover.
Last updated 9 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 | 97 | 52 | 10 |
| 2025 | 105 | 70 | 27 |
| 2024 | 140 | 110 | 18 |
| 2023 | 150 | 117 | 19 |
| 2022 | 119 | 89 | 17 |
| 2021 | 170 | 138 | 19 |
| 2020 | 142 | 103 | 22 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| Kvl designs Ltd | 16 | 25 |
| AW Architecture Ltd | 7 | 9 |
| M C S Design Architectural Services | 7 | 7 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Hillingdon | 10,293 | 3,891 | about 1 in 4 |
| Spelthorne | 920 | 214 | about 1 in 5 |