From £16,836
Trusted and professional extension builder in BT17. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £16,836
Need an Extension Builder in BT17? H.M.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many years...
From £16,884
Relax... you have found a reliable extension builder in BT17. Finch Construction NI is a friendly and reliable company based in BT17 who consider n...
From £16,676
Trusted and professional extension builder in BT17. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £16,900
T.I Building is a trusted extension builder serving customers in BT17 and the surrounding area. Contact us to today to get a competitive quote for ...
From £16,780
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,868
Relax... you have found a reliable extension builder in BT17. SM Plumbing & Heating is a friendly and reliable company based in BT17 who consider n...
From £16,708
Need an Extension Builder in BT17? MIRKOW has been helping local clients (20 mile radius) with their extension buildering jobs for many years. Get ...
From £16,852
Need to find an Extension Builder near you for all your extension buildering work?
Firenstack Solutions provides a local, trusted extension...

Underpinning ranges from £16,676 (Extended living by Gilbert-Ash based in BT12) to £16,988 (AK Building Services based in BT8), 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 BT17 by posting a job with HaMuch and we will send it to extension builders in BT17.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Lisburn | £24 | £164 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Hillsborough and Culcavy | £25 | £170 |
| Underpin A Building near Maghaberry | £31 | £205 |
| Underpin A Building near Crumlin | £26 | £194 |
| Underpin A Building near Saintfield | £23 | £162 |
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Comber | £22 | £160 |
| Underpin A Building near Ballynahinch | £19 | £189 |
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 - £16,833

Two storey extension - £86,999

Build a timber frame extension - £25,333

Build a swimming pool - £80,333

Single storey extension - £41,656

Side return extension - £33,994

Install an RSJ - £1,533

Outbuilding - £9,333

Build a Mansard loft conversion - £51,333

Loft conversion - £27,495

Build a kitchen extension - £41,333

Hip to gable loft conversion - £41,333

Granny annexe - £86,333

Garden office - £9,333

Convert a Garage - £15,333

Garage - £17,833

Build a flat roof extension - £21,333

Build a dormer loft conversion - £41,333

Concrete foundations - £5,583

Convert a bungalow loft - £28,333

Convert a basement - £29,994