Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
Relax... you have found a reliable extension builder in Dundonald. SM Plumbing & Heating is a friendly and reliable company based in Dundonald who ...
From £16,796
Ballantine building solutions is an established extension buildering business in Dundonald. We come highly recommended and provide competitive quot...
From £16,884
Designco Ltd is an established extension buildering business in Dundonald. We come highly recommended and provide competitive quotes for your work....
From £16,676
Trusted and professional extension builder in Dundonald. Experienced in all extension buildering work and keeping within budget and on quote. Exten...
From £16,764
Trusted and professional extension builder in Dundonald. Experienced in all extension buildering work and keeping within budget and on quote. DGA h...

Underpinning ranges from £16,636 (Mount Oriel Conversions & Extensions based in BT8) 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 Dundonald by posting a job with HaMuch and we will send it to extension builders in Dundonald.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Comber | £22 | £160 |
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Ballygowan | £24 | £183 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Saintfield | £23 | £162 |
| Underpin A Building near Carrickfergus | £23 | £158 |
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 - £86,953

Build a timber frame extension - £25,302

Build a swimming pool - £80,302

Single storey extension - £41,034

Side return extension - £33,644

Install an RSJ - £1,502

Outbuilding - £9,302

Build a Mansard loft conversion - £51,302

Loft conversion - £27,204

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 - £29,644