Side extensions in Caerphilly
1,326 applications since 2016. 983 approved and 241 refused. Refused: about 1 in 5 here, about 1 in 7 across the councils we cover.
Last updated 9 November 2026.
Without planning permission
- Single storey, no higher than 4 m
- No wider than half the width of the original house
- Not facing a road
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 | 76 | 48 | 15 |
| 2025 | 90 | 60 | 27 |
| 2024 | 95 | 65 | 22 |
| 2023 | 101 | 77 | 19 |
| 2022 | 146 | 100 | 41 |
| 2021 | 189 | 123 | 54 |
| 2020 | 154 | 117 | 29 |
| 2019 | 115 | 99 | 6 |
| 2018 | 122 | 108 | 8 |
| 2017 | 123 | 100 | 10 |
| 2016 | 115 | 86 | 10 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| Penrose Architectural Services | 13 | 15 |
| Williams Architectural Design | 11 | 19 |
| K J Lloyd Architect | 5 | 9 |
| Milsom Architectural Services | 4 | 6 |
| Skerryvore Designs | 4 | 5 |
| Andrews Architecture | 3 | 6 |
| Dean Lock Design | 3 | 6 |
| CLC Construction Consultants Ltd | 3 | 5 |