From £16,476
Have worked in building industry for over 30 years contracts from government to private sector.
From £16,764
Trusted and professional extension builder in BT40. Experienced in all extension buildering work and keeping within budget and on quote. DGA have m...
From £16,796
Ballantine building solutions is an established extension buildering business in BT40. We come highly recommended and provide competitive quotes fo...
From £16,876
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,884
Designco Ltd is an established extension buildering business in BT40. We come highly recommended and provide competitive quotes for your work.
...From £16,868
Relax... you have found a reliable extension builder in BT40. SM Plumbing & Heating is a friendly and reliable company based in BT40 who consider n...
From £16,708
Need an Extension Builder in BT40? 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...
From £16,676
Trusted and professional extension builder in BT40. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £16,780
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,476 (Anak based in BT40) to £16,884 (Designco Ltd based in BT36), 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 BT40 by posting a job with HaMuch and we will send it to extension builders in BT40.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Larne | £15 | £122 |
| Underpin A Building near Carrickfergus | £23 | £158 |
| Underpin A Building near Ballyclare | £20 | £124 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Ballygowan | £24 | £183 |
| Underpin A Building near Comber | £22 | £160 |
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 - £16,768

Two storey extension - £86,902

Build a timber frame extension - £25,268

Build a swimming pool - £80,268

Single storey extension - £40,360

Side return extension - £33,265

Install an RSJ - £1,468

Outbuilding - £9,268

Build a Mansard loft conversion - £51,268

Loft conversion - £26,888

Build a kitchen extension - £41,268

Hip to gable loft conversion - £41,268

Granny annexe - £86,268

Garden office - £9,268

Convert a Garage - £15,268

Garage - £17,768

Build a flat roof extension - £21,268

Build a dormer loft conversion - £41,268

Concrete foundations - £5,518

Convert a bungalow loft - £28,268

Convert a basement - £29,265