From £16,860
Power Construction is an established and experienced local extension builder in Knockmenagh. Please contact us for a free, no obligation quote and ...
From £17,516
Need to find an Extension Builder near you for all your extension buildering work?
GMC Construction provides a local, trusted extension bui...
From £16,900
T.I Building is a trusted extension builder serving customers in Knockmenagh and the surrounding area. Contact us to today to get a competitive quo...
From £17,140
With extensive extension buildering experience, we provide reliable, high-quality workmanship at competitive prices. G K Contracts Building & Joine...
From £16,636
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £16,796
Been in business as 18 years alway put clients first and never had any combacks
From £16,836
Trusted and professional extension builder in Knockmenagh. Experienced in all extension buildering work and keeping within budget and on quote. Bel...
From £16,948
Trusted and professional extension builder in Knockmenagh. Experienced in all extension buildering work and keeping within budget and on quote. The...
From £17,036
Experienced extension builder ready to quote for your work. Terry Design is the best extension builder in Knockmenagh. No obligation free quotes an...

Underpinning ranges from £16,636 (Mount Oriel Conversions & Extensions based in BT8) to £18,060 (Build a Boiler based in BT67), 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 Knockmenagh by posting a job with HaMuch and we will send it to extension builders in Knockmenagh.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Waringstown | £23 | £167 |
| Underpin A Building near Craigavon | £23 | £181 |
| Underpin A Building near Maghaberry | £31 | £205 |
| Underpin A Building near Banbridge | £29 | £205 |
| Underpin A Building near Hillsborough and Culcavy | £25 | £170 |
| Underpin A Building near Coalisland | £27 | £223 |
| Underpin A Building near Lisburn | £24 | £164 |
| Underpin A Building near Crumlin | £26 | £194 |
| Underpin A Building near Dungannon | £30 | £238 |
| Underpin A Building near Carryduff | £23 | £158 |
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 - £17,073

Two storey extension - £87,359

Build a timber frame extension - £25,573

Build a swimming pool - £80,573

Single storey extension - £46,456

Side return extension - £36,694

Install an RSJ - £1,773

Outbuilding - £9,573

Build a Mansard loft conversion - £51,573

Loft conversion - £29,745

Build a kitchen extension - £41,573

Hip to gable loft conversion - £41,573

Granny annexe - £86,573

Garden office - £9,573

Convert a Garage - £15,573

Garage - £18,073

Build a flat roof extension - £21,573

Build a dormer loft conversion - £41,573

Concrete foundations - £5,823

Convert a bungalow loft - £28,573

Convert a basement - £32,694