From £16,476
Have worked in building industry for over 30 years contracts from government to private sector.
From £16,900
T.I Building is a trusted extension builder serving customers in BT38 and the surrounding area. Contact us to today to get a competitive quote for ...
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 £16,868
Relax... you have found a reliable extension builder in BT38. SM Plumbing & Heating is a friendly and reliable company based in BT38 who consider n...
From £16,836
Trusted and professional extension builder in BT38. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £16,796
Ballantine building solutions is an established extension buildering business in BT38. We come highly recommended and provide competitive quotes fo...
From £16,764
Trusted and professional extension builder in BT38. Experienced in all extension buildering work and keeping within budget and on quote. DGA have m...
From £16,884
Designco Ltd is an established extension buildering business in BT38. We come highly recommended and provide competitive quotes for your work.
...From £16,876
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 £16,988 (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 BT38 by posting a job with HaMuch and we will send it to extension builders in BT38.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Carrickfergus | £23 | £158 |
| 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 Larne | £15 | £122 |
| Underpin A Building near Ballyclare | £20 | £124 |
| 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 - £16,802

Two storey extension - £86,954

Build a timber frame extension - £25,302

Build a swimming pool - £80,302

Single storey extension - £41,048

Side return extension - £33,652

Install an RSJ - £1,502

Outbuilding - £9,302

Build a Mansard loft conversion - £51,302

Loft conversion - £27,210

Build a kitchen extension - £41,302

Hip to gable loft conversion - £41,302

Granny annexe - £86,302

Garden office - £9,302

Convert a Garage - £15,302

Garage - £17,802

Build a flat roof extension - £21,302

Build a dormer loft conversion - £41,302

Concrete foundations - £5,552

Convert a bungalow loft - £28,302

Convert a basement - £29,652