Garden rooms and outbuildings in Lisburn and Castlereagh
All of Lisburn and Castlereagh
2,663 applications since 2016. 2,165 approved and 183 refused. Refused: about 1 in 13 here, about 1 in 7 across the councils we cover.
Last updated 8 November 2026.
Without planning permission
- Single storey, not in front of the house
- No higher than 2.5 m within 2 m of a boundary; otherwise 4 m with a dual-pitched roof or 3 m any other
- Together with other buildings, no more than half the garden and grounds
- For use incidental to the house, not a separate home
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 | 137 | 57 | 2 |
| 2025 | 153 | 114 | 3 |
| 2024 | 153 | 114 | 5 |
| 2023 | 210 | 149 | 23 |
| 2022 | 238 | 195 | 18 |
| 2021 | 346 | 286 | 33 |
| 2020 | 235 | 204 | 23 |
| 2019 | 319 | 272 | 29 |
| 2018 | 284 | 253 | 17 |
| 2017 | 303 | 267 | 12 |
| 2016 | 285 | 254 | 18 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| Planning Services | 21 | 30 |
| McCready Architects | 18 | 22 |
| Colin McAuley Planning | 14 | 14 |
| PJ Design | 12 | 12 |
| APD Architects Ltd. | 11 | 12 |
| P S Design | 10 | 11 |
| Ballymullan Architect (BMA) Ltd | 10 | 10 |
| G.T. Design | 7 | 8 |
| David Haire Architectural Design | 7 | 7 |
| Gary Harpur Architect | 7 | 7 |