Side extensions in Merton
2,551 applications since 2019. 2,083 approved and 366 refused. Refused: about 1 in 7 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 | 189 | 118 | 12 |
| 2025 | 311 | 262 | 31 |
| 2024 | 301 | 240 | 57 |
| 2023 | 354 | 275 | 73 |
| 2022 | 342 | 281 | 57 |
| 2021 | 410 | 344 | 61 |
| 2020 | 330 | 290 | 37 |
| 2019 | 314 | 273 | 38 |
Neighbouring councils
| Council | Approved | Refused | How often |
|---|---|---|---|
| Croydon | 7,496 | 1,834 | about 1 in 5 |
| Kingston | 3,936 | 1,146 | about 1 in 4 |
| Lambeth | 3,946 | 807 | about 1 in 6 |
| Sutton | 3,215 | 865 | about 1 in 5 |
| Wandsworth | 4,650 | 349 | about 1 in 14 |