From £17,012
N W Doyle & Son is a trusted extension builder serving customers in BT23 and the surrounding area. Contact us to today to get a competitive quote f...
From £16,900
T.I Building is a trusted extension builder serving customers in BT23 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 BT23. SM Plumbing & Heating is a friendly and reliable company based in BT23 who consider n...
From £16,836
Trusted and professional extension builder in BT23. 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 BT23. We come highly recommended and provide competitive quotes fo...
From £16,772
apex pharaoh ltd is a trusted extension builder serving customers in BT23 and the surrounding area. Contact us to today to get a competitive quote ...
From £16,676
Trusted and professional extension builder in BT23. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £16,884
Designco Ltd is an established extension buildering business in BT23. We come highly recommended and provide competitive quotes for your work.
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Underpinning ranges from £16,636 (Mount Oriel Conversions & Extensions based in BT8) to £17,012 (N W Doyle & Son based in BT24), 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 BT23 by posting a job with HaMuch and we will send it to extension builders in BT23.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Ballygowan | £24 | £183 |
| Underpin A Building near Comber | £22 | £160 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Saintfield | £23 | £162 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Ballynahinch | £19 | £189 |
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 - £16,837

Two storey extension - £87,005

Build a timber frame extension - £25,337

Build a swimming pool - £80,337

Single storey extension - £41,736

Side return extension - £34,039

Install an RSJ - £1,537

Outbuilding - £9,337

Build a Mansard loft conversion - £51,337

Loft conversion - £27,533

Build a kitchen extension - £41,337

Hip to gable loft conversion - £41,337

Granny annexe - £86,337

Garden office - £9,337

Convert a Garage - £15,337

Garage - £17,837

Build a flat roof extension - £21,337

Build a dormer loft conversion - £41,337

Concrete foundations - £5,587

Convert a bungalow loft - £28,337

Convert a basement - £30,039