From £16,796
Ballantine building solutions is an established extension buildering business in Holywood. We come highly recommended and provide competitive quote...
From £16,884
Designco Ltd is an established extension buildering business in Holywood. We come highly recommended and provide competitive quotes for your work.<...
From £16,764
Trusted and professional extension builder in Holywood. Experienced in all extension buildering work and keeping within budget and on quote. DGA ha...
From £16,868
Relax... you have found a reliable extension builder in Holywood. SM Plumbing & Heating is a friendly and reliable company based in Holywood who co...
From £16,708
Need an Extension Builder in Holywood? MIRKOW has been helping local clients (20 mile radius) with their extension buildering jobs for many years. ...
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 £16,780
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
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 £16,676
Trusted and professional extension builder in Holywood. Experienced in all extension buildering work and keeping within budget and on quote. Extend...
From £16,836
Need an Extension Builder in Holywood? H.M.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many y...

Underpinning ranges from £16,676 (Extended living by Gilbert-Ash based in BT12) 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 Holywood by posting a job with HaMuch and we will send it to extension builders in Holywood.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Carrickfergus | £23 | £158 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Ballygowan | £24 | £183 |
| Underpin A Building near Comber | £22 | £160 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Ballyclare | £20 | £124 |
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 - £16,804

Two storey extension - £86,956

Build a timber frame extension - £25,304

Build a swimming pool - £80,304

Single storey extension - £41,080

Side return extension - £33,670

Install an RSJ - £1,504

Outbuilding - £9,304

Build a Mansard loft conversion - £51,304

Loft conversion - £27,225

Build a kitchen extension - £41,304

Hip to gable loft conversion - £41,304

Granny annexe - £86,304

Garden office - £9,304

Convert a Garage - £15,304

Garage - £17,804

Build a flat roof extension - £21,304

Build a dormer loft conversion - £41,304

Concrete foundations - £5,554

Convert a bungalow loft - £28,304

Convert a basement - £29,670