From £16,852
Need to find an Extension Builder near you for all your extension buildering work?
Firenstack Solutions provides a local, trusted extension...
From £16,708
Need an Extension Builder in BT5? MIRKOW has been helping local clients (20 mile radius) with their extension buildering jobs for many years. Get a...
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 BT5. SM Plumbing & Heating is a friendly and reliable company based in BT5 who consider no ...
From £16,820
C.H Property Services is a trusted extension builder serving customers in BT5 and the surrounding area. Contact us to today to get a competitive qu...
From £16,676
Trusted and professional extension builder in BT5. Experienced in all extension buildering work and keeping within budget and on quote. Extended li...
From £16,884
Designco Ltd is an established extension buildering business in BT5. We come highly recommended and provide competitive quotes for your work.
From £16,836
Need an Extension Builder in BT5? H.M.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many years....
From £16,796
Ballantine building solutions is an established extension buildering business in BT5. We come highly recommended and provide competitive quotes for...

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 BT5 by posting a job with HaMuch and we will send it to extension builders in BT5.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Belfast | £20 | £137 |
| Underpin A Building near Carryduff | £20 | £136 |
| Underpin A Building near Holywood | £20 | £138 |
| Underpin A Building near Comber | £20 | £142 |
| Underpin A Building near Ballygowan | £20 | £150 |
| Underpin A Building near Greenisland | £20 | £134 |
| Underpin A Building near Saintfield | £20 | £141 |
| Underpin A Building near Lisburn | £20 | £139 |
| Underpin A Building near Bangor | £20 | £150 |
| Underpin A Building near Bangor | £20 | £150 |
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 - £16,821

Two storey extension - £86,981

Build a timber frame extension - £25,321

Build a swimming pool - £80,321

Single storey extension - £41,416

Side return extension - £33,859

Install an RSJ - £1,521

Outbuilding - £9,321

Build a Mansard loft conversion - £51,321

Loft conversion - £27,383

Build a kitchen extension - £41,321

Hip to gable loft conversion - £41,321

Granny annexe - £86,321

Garden office - £9,321

Convert a Garage - £15,321

Garage - £17,821

Build a flat roof extension - £21,321

Build a dormer loft conversion - £41,321

Concrete foundations - £5,571

Convert a bungalow loft - £28,321

Convert a basement - £29,859