From £17,404
FJS CONTRACTS LTD are here to help customers who need an Extension Builder in BT45. We offer a competitive rate to complete all your extension buil...
From £16,796
Been in business as 18 years alway put clients first and never had any combacks
From £17,516
Seamus Mcmullan building and joinery is an established extension buildering business in BT45. We come highly recommended and provide competitive qu...
From £16,932
We have over 25 years experience in all building work and renowned for good workmanship All jobs small and large taken on
From £17,020
Luxury Garden Studios is an established and experienced local extension builder in BT45. Please contact us for a free, no obligation quote and comp...
From £17,284
JP&S Construction Ltd is an established extension buildering business in BT45. We come highly recommended and provide competitive quotes for your w...
From £17,108
Need an Extension Builder in BT45? SF Carpentry has been helping local clients (20 mile radius) with their extension buildering jobs for many years...
From £17,196
Relax... you have found a reliable extension builder in BT45. JAMSE CONSTRUCTION LTD is a friendly and reliable company based in BT45 who consider ...

Underpinning ranges from £16,796 (Oakmore Contracts based in BT45) to £17,516 (Seamus Mcmullan building and joinery based in BT45), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in BT45 by posting a job with HaMuch and we will send it to extension builders in BT45.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Magherafelt | £30 | £238 |
| Underpin A Building near Coalisland | £27 | £223 |
| Underpin A Building near Dungiven | £22 | £190 |
| Underpin A Building near Dungannon | £30 | £238 |
| Underpin A Building near Crumlin | £26 | £194 |
| Underpin A Building near Coleraine | £23 | £201 |
| Underpin A Building near Ballymoney | £21 | £187 |
| Underpin A Building near Ballyclare | £20 | £124 |
| Underpin A Building near Craigavon | £23 | £181 |
| Underpin A Building near Maghaberry | £31 | £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 - £17,157

Two storey extension - £87,486

Build a timber frame extension - £25,657

Build a swimming pool - £80,657

Single storey extension - £48,140

Side return extension - £37,641

Install an RSJ - £1,857

Outbuilding - £9,657

Build a Mansard loft conversion - £51,657

Loft conversion - £30,534

Build a kitchen extension - £41,657

Hip to gable loft conversion - £41,657

Granny annexe - £86,657

Garden office - £9,657

Convert a Garage - £15,657

Garage - £18,157

Build a flat roof extension - £21,657

Build a dormer loft conversion - £41,657

Concrete foundations - £5,907

Convert a bungalow loft - £28,657

Convert a basement - £33,641