Rear extensions in Milton Keynes
15,234 applications since 1999. 12,428 approved and 1,395 refused. Refused: about 1 in 10 here, about 1 in 7 across the councils we cover.
Last updated 8 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 | 375 | 216 | 31 |
| 2025 | 531 | 431 | 64 |
| 2024 | 486 | 391 | 61 |
| 2023 | 541 | 430 | 72 |
| 2022 | 684 | 580 | 42 |
| 2021 | 822 | 699 | 49 |
| 2020 | 653 | 513 | 62 |
| 2019 | 576 | 462 | 55 |
| 2018 | 606 | 511 | 29 |
| 2017 | 686 | 586 | 28 |
| 2016 | 774 | 583 | 68 |
| 2015 | 586 | 433 | 82 |