From £16,476
Have worked in building industry for over 30 years contracts from government to private sector.
From £16,932
We have over 25 years experience in all building work and renowned for good workmanship All jobs small and large taken on
From £17,404
FJS CONTRACTS LTD are here to help customers who need an Extension Builder in Ballymena. We offer a competitive rate to complete all your extension...
From £16,796
Been in business as 18 years alway put clients first and never had any combacks
From £16,996
Trusted and professional extension builder in Ballymena. Experienced in all extension buildering work and keeping within budget and on quote. purdy...
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 £16,764
Trusted and professional extension builder in Ballymena. Experienced in all extension buildering work and keeping within budget and on quote. DGA h...

Underpinning ranges from £16,476 (Anak based in BT40) to £17,404 (FJS CONTRACTS LTD based in BT45), 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 Ballymena by posting a job with HaMuch and we will send it to extension builders in Ballymena.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Ballyclare | £20 | £124 |
| Underpin A Building near Magherafelt | £30 | £238 |
| Underpin A Building near Ballymoney | £21 | £187 |
| Underpin A Building near Crumlin | £26 | £194 |
| Underpin A Building near Larne | £15 | £122 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Coleraine | £23 | £201 |
| Underpin A Building near Carrickfergus | £23 | £158 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Holywood | £23 | £159 |
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 - £16,892

Two storey extension - £87,088

Build a timber frame extension - £25,392

Build a swimming pool - £80,392

Single storey extension - £42,840

Side return extension - £34,660

Install an RSJ - £1,592

Outbuilding - £9,392

Build a Mansard loft conversion - £51,392

Loft conversion - £28,050

Build a kitchen extension - £41,392

Hip to gable loft conversion - £41,392

Granny annexe - £86,392

Garden office - £9,392

Convert a Garage - £15,392

Garage - £17,892

Build a flat roof extension - £21,392

Build a dormer loft conversion - £41,392

Concrete foundations - £5,642

Convert a bungalow loft - £28,392

Convert a basement - £30,660