Building services in Antrim
House extensions
- Single-storey extensions
- Double-storey extensions
- Side extensions
- Side return extensions
- Wraparound extensions
- Kitchen extensions
- Orangeries
- Glazed and contemporary extensions
- Porches
Loft conversions
- Dormer loft conversions
- Hip-to-gable loft conversions
- Mansard loft conversions
- Rooflight loft conversions
- Bungalow loft conversions
Garage, basement and barn conversions
New build homes
Renovations and structural work
Design and approvals
Guide prices in Antrim
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £1,700–£2,500 per m² of floor area |
| Kitchen extensions | £1,950–£2,900 per m² including a mid-range kitchen |
| Dormer loft conversions | £41,500–£58,500 for a typical rear dormer with en-suite |
| Hip-to-gable loft conversions | £47,500–£67,000 for a hip-to-gable with rear dormer |
| Garage conversions | £15,500–£26,000 for a single integral garage |
| Orangeries | £2,050–£2,900 per m² of floor area |
That range is adjusted for Northern Ireland, where domestic building work typically costs around 14% below the national average.
Planning permission in Antrim
In Northern Ireland the Planning (General Permitted Development) Order (Northern Ireland) 2015 allows single-storey rear extensions of up to 3 metres on attached houses and 4 metres on detached houses, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary. Houses with removed rights need planning permission, listed buildings need consent, and in conservation areas extensions must stay single-storey and must not come forward of the front or side walls.
In Northern Ireland building control approval comes from the council, usually through a full plans application or a building notice, with inspections during the work and a completion certificate at the end.
About building in Antrim
Northern Ireland has many detached and semi-detached homes on generous plots, which suits single-storey rear extensions and garage conversions.
Our Antrim coverage includes postcode districts BT41, and we also work in nearby places such as Ballymena, Newtownabbey and Belfast. Antrim has a population of around 20,000.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions from homeowners in Antrim
How much does a loft conversion cost in Antrim?
A rear dormer loft conversion in Antrim typically costs £41,500–£58,500 for a typical rear dormer with en-suite, including VAT.
Do I need planning permission for an extension in Antrim?
In Northern Ireland the Planning (General Permitted Development) Order (Northern Ireland) 2015 allows single-storey rear extensions of up to 3 metres on attached houses and 4 metres on detached houses, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary. Houses with removed rights need planning permission, listed buildings need consent, and in conservation areas extensions must stay single-storey and must not come forward of the front or side walls.
Do you work in Antrim?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Antrim, including postcodes BT41.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
How much does an extension cost in Antrim?
A single-storey extension in Antrim typically costs £1,700–£2,500 per m² of floor area, and a double-storey extension £1,400–£2,150 per m² of floor area (both floors), including VAT.