Side extensions in Lisburn and Castlereagh
All of Lisburn and Castlereagh
1,005 applications since 2016. 954 approved and 10 refused. Refused: about 1 in 96 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 | 83 | 55 | 1 |
| 2025 | 83 | 78 | 0 |
| 2024 | 65 | 65 | 0 |
| 2023 | 68 | 63 | 3 |
| 2022 | 92 | 89 | 1 |
| 2021 | 128 | 127 | 1 |
| 2020 | 103 | 100 | 1 |
| 2019 | 110 | 109 | 0 |
| 2018 | 93 | 89 | 3 |
| 2017 | 97 | 96 | 0 |
| 2016 | 83 | 83 | 0 |
Architects and agents, last 5 years
| Firm | Approved | Decided |
|---|---|---|
| JEM Architectural Services Ltd | 7 | 8 |
| Robert Gilmour Architects | 7 | 7 |
| Mullan Architects | 5 | 6 |
| PJ Design | 5 | 5 |
| david mills architect | 5 | 5 |