From £9,288
We offer a wide range of services completed to a high standard with fully trained personnel
From £9,408
NG Builders is an established extension buildering business in Dumlea. We come highly recommended and provide competitive quotes for your work.
...From £9,696
Relax... you have found a reliable extension builder in Dumlea. JAMSE CONSTRUCTION LTD is a friendly and reliable company based in Dumlea who consi...
From £9,784
JP&S Construction Ltd is an established extension buildering business in Dumlea. We come highly recommended and provide competitive quotes for your...
From £9,784
Relax... you have found a reliable extension builder in Dumlea. Tyrone Turbos is a friendly and reliable company based in Dumlea who consider no jo...
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...

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 Dumlea by posting a job with HaMuch. We'll send it to extension builders in Dumlea.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Dungannon | £23 | £186 |
| Garden Office near Strabane | £21 | £173 |
| Garden Office near Coalisland | £21 | £173 |
| Garden Office near Dungiven | £21 | £179 |
| Garden Office near Newbuildings | £20 | £166 |
| Garden Office near Londonderry | £20 | £166 |
| Garden Office near Magherafelt | £25 | £200 |
| Garden Office near Strathfoyle | £20 | £166 |
| Garden Office near Craigavon | £22 | £170 |
| Garden Office near Coleraine | £21 | £181 |
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 - £17,163

Two storey extension - £87,494

Build a timber frame extension - £25,663

Build a swimming pool - £80,663

Single storey extension - £48,253

Side return extension - £37,705

Install an RSJ - £1,863

Outbuilding - £9,663

Build a Mansard loft conversion - £51,663

Loft conversion - £30,588

Build a kitchen extension - £41,663

Hip to gable loft conversion - £41,663

Granny annexe - £86,663

Garden office - £9,663

Convert a Garage - £15,663

Garage - £18,163

Build a flat roof extension - £21,663

Build a dormer loft conversion - £41,663

Concrete foundations - £5,913

Convert a bungalow loft - £28,663

Convert a basement - £33,705