County Antrim
Rear extensions in Antrim
Rear extensions in Antrim: single-storey and two-storey extensions, side returns, wraparounds and glass-led designs, planned around terraces, semis and detached bungalows and the Northern Irish rules.
Antrim is in County Antrim, with postcode districts including BT41. The nearest places we also cover are Ballymena (10.4 miles) and Newtownabbey (12.7 miles).
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
Rear extensions we build in Antrim
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for bungalows
- Rear extension plans and planning applications
Also available across County Antrim:
- Rear extensions for detached houses
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Building Regulations for rear extensions
Rear extension prices in Antrim
Northern Ireland prices are the lowest in our range.
| Example | Guide inc VAT |
|---|---|
| Single-storey, 3 m × 4 m (12 m²) | £20,000–£32,500 |
| Single-storey, 4 m × 6 m (24 m²) | £39,500–£64,500 |
| Two-storey, 3 m × 5 m footprint (30 m²) | £47,000–£70,500 |
| Side return, about 14 m² | £28,000–£46,500 |
| Wraparound, about 25 m² | £48,000–£78,500 |
What are homes in Antrim like to extend?
Antrim has terraces near the centre, semis on the edges and many detached houses and bungalows in the surrounding countryside, where plots are often generous.
Planning rules for Antrim
Northern Ireland's permitted development rules allow a single-storey rear extension of 3 metres on terraced and semi-detached houses and 4 metres on detached houses, with a 4 metre height limit. Listed buildings, conservation areas and houses with removed rights need planning permission from the council.
Northern Ireland has no larger-extension prior approval route; anything beyond permitted development needs a planning application.
In Northern Ireland building control is run by the councils. A rear extension needs approval (full plans or building notice) and is built to the Northern Ireland Technical Booklets.
Nearby towns
FAQ
Questions people ask
How much is a rear extension in Antrim?
A 3 m × 4 m single-storey rear extension is about £20,000–£32,500 including VAT at our Northern Ireland guide rates; the written price follows a survey.
Do I need planning permission in Antrim?
Often not for a single-storey rear extension of up to 3 metres (4 metres detached) under Northern Ireland's permitted development rules, outside conservation areas.
Is the site visit in Antrim free?
Yes, with no obligation.
Do I need a party wall agreement?
Northern Ireland has no Party Wall Act; we agree any shared-wall work with your neighbour in writing.