From £16,764
Trusted and professional extension builder in Donaghadee. Experienced in all extension buildering work and keeping within budget and on quote. DGA ...
From £16,796
Ballantine building solutions is an established extension buildering business in Donaghadee. We come highly recommended and provide competitive quo...
From £16,772
apex pharaoh ltd is a trusted extension builder serving customers in Donaghadee and the surrounding area. Contact us to today to get a competitive ...
From £16,884
Designco Ltd is an established extension buildering business in Donaghadee. We come highly recommended and provide competitive quotes for your work...
From £16,868
Relax... you have found a reliable extension builder in Donaghadee. SM Plumbing & Heating is a friendly and reliable company based in Donaghadee wh...
From £16,812
Colin Gilmore Building Contractor is an established extension buildering business in Donaghadee. We come highly recommended and provide competitive...
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 £16,676
Trusted and professional extension builder in Donaghadee. Experienced in all extension buildering work and keeping within budget and on quote. Exte...
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 £16,636 (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 Donaghadee by posting a job with HaMuch and we will send it to extension builders in Donaghadee.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| 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 Holywood | £23 | £159 |
| Underpin A Building near Carrickfergus | £23 | £158 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Saintfield | £23 | £162 |
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 - £16,807

Two storey extension - £86,961

Build a timber frame extension - £25,307

Build a swimming pool - £80,307

Single storey extension - £41,144

Side return extension - £33,706

Install an RSJ - £1,507

Outbuilding - £9,307

Build a Mansard loft conversion - £51,307

Loft conversion - £27,255

Build a kitchen extension - £41,307

Hip to gable loft conversion - £41,307

Granny annexe - £86,307

Garden office - £9,307

Convert a Garage - £15,307

Garage - £17,807

Build a flat roof extension - £21,307

Build a dormer loft conversion - £41,307

Concrete foundations - £5,557

Convert a bungalow loft - £28,307

Convert a basement - £29,706