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

Garden offices 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 only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in Northern Ireland by posting a job with HaMuch. We'll send it to extension builders in Northern Ireland.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Dungannon | £30 | £238 |
| Garden Office near Coalisland | £27 | £223 |
| Garden Office near Magherafelt | £30 | £238 |
| Garden Office near Craigavon | £23 | £181 |
| Garden Office near Dungiven | £22 | £190 |
| Garden Office near Strabane | £27 | £223 |
| Garden Office near Waringstown | £23 | £167 |
| Garden Office near Londonderry | £24 | £190 |
| Garden Office near Newbuildings | £24 | £190 |
| Garden Office 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