Rear extensions in Flintshire
4,699 applications since 1974. 4,267 approved and 258 refused. Refused: about 1 in 18 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 | 79 | 45 | 1 |
| 2025 | 119 | 104 | 10 |
| 2024 | 104 | 97 | 5 |
| 2023 | 120 | 104 | 12 |
| 2022 | 145 | 133 | 8 |
| 2021 | 207 | 180 | 12 |
| 2020 | 165 | 154 | 9 |
| 2019 | 128 | 119 | 7 |
| 2018 | 152 | 137 | 12 |
| 2017 | 126 | 114 | 7 |
| 2016 | 136 | 128 | 4 |
| 2015 | 104 | 92 | 7 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| JNL Design | 28 | 36 |
| JIG Architects Ltd. | 19 | 20 |
| A.F Architectural Designs | 18 | 19 |
| d2 architects | 13 | 16 |
| Deeside Architectural Design Ltd | 9 | 11 |
| Sustain Architecture | 9 | 9 |
| Deva Architectural Services | 8 | 8 |
| CH Design | 7 | 9 |
| AGD Architectural Ltd | 6 | 6 |
| BH Architects Ltd | 5 | 5 |