Loft conversions and dormers in Welwyn Hatfield
1,104 applications since 2020. 761 approved and 263 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 | 73 | 48 | 11 |
| 2025 | 132 | 105 | 14 |
| 2024 | 131 | 89 | 32 |
| 2023 | 154 | 104 | 40 |
| 2022 | 192 | 124 | 56 |
| 2021 | 233 | 167 | 56 |
| 2020 | 189 | 124 | 54 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Broxbourne | 2,204 | 378 | about 1 in 7 |
| East Hertfordshire | 1,168 | 400 | about 1 in 4 |
| Enfield | 4,763 | 1,323 | about 1 in 5 |
| Hertsmere | 2,302 | 380 | about 1 in 7 |
| North Hertfordshire | 1,080 | 120 | about 1 in 10 |