From £9,784
JP&S Construction Ltd is an established extension buildering business in Northern Ireland. We come highly recommended and provide competitive quote...
From £10,016
Need to find an Extension Builder near you for all your extension buildering work?
GMC Construction provides a local, trusted extension bui...
From £9,288
We offer a wide range of services completed to a high standard with fully trained personnel
From £10,016
Seamus Mcmullan building and joinery is an established extension buildering business in Northern Ireland. We come highly recommended and provide co...
From £9,904
FJS CONTRACTS LTD are here to help customers who need an Extension Builder in Northern Ireland. We offer a competitive rate to complete all your ex...
From £9,296
Been in business as 18 years alway put clients first and never had any combacks

Outbuilding costs in Northern Ireland range from the cheapest of £9,288 (M & R McElhatton Joinery based in BT76) to the dearest of £10,016 (GMC Construction based in BT70), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in Northern Ireland by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Dungannon | £30 | £238 |
| Outbuilding near Coalisland | £27 | £223 |
| Outbuilding near Magherafelt | £30 | £238 |
| Outbuilding near Craigavon | £23 | £181 |
| Outbuilding near Dungiven | £22 | £190 |
| Outbuilding near Strabane | £27 | £223 |
| Outbuilding near Waringstown | £23 | £167 |
| Outbuilding near Londonderry | £24 | £190 |
| Outbuilding near Newbuildings | £24 | £190 |
| Outbuilding near Banbridge | £29 | £205 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,217

Two storey extension - £87,576

Build a timber frame extension - £25,717

Build a swimming pool - £80,717

Single storey extension - £49,347

Side return extension - £38,320

Install an RSJ - £1,917

Outbuilding - £9,717

Build a Mansard loft conversion - £51,717

Loft conversion - £31,100

Build a kitchen extension - £41,717

Hip to gable loft conversion - £41,717

Granny annexe - £86,717

Garden office - £9,717

Convert a Garage - £15,717

Garage - £18,217

Build a flat roof extension - £21,717

Build a dormer loft conversion - £41,717

Concrete foundations - £5,967

Convert a bungalow loft - £28,717

Convert a basement - £34,320