From £16,900
T.I Building is a trusted extension builder serving customers in Hillsborough and the surrounding area. Contact us to today to get a competitive qu...
From £16,884
Relax... you have found a reliable extension builder in Hillsborough. Finch Construction NI is a friendly and reliable company based in Hillsboroug...
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 £16,836
Trusted and professional extension builder in Hillsborough. Experienced in all extension buildering work and keeping within budget and on quote. Be...
From £16,676
Trusted and professional extension builder in Hillsborough. Experienced in all extension buildering work and keeping within budget and on quote. Ex...
From £17,012
N W Doyle & Son is a trusted extension builder serving customers in Hillsborough and the surrounding area. Contact us to today to get a competitive...
From £16,948
Trusted and professional extension builder in Hillsborough. Experienced in all extension buildering work and keeping within budget and on quote. Th...
From £16,868
Relax... you have found a reliable extension builder in Hillsborough. SM Plumbing & Heating is a friendly and reliable company based in Hillsboroug...

Underpinning ranges from £16,636 (Mount Oriel Conversions & Extensions based in BT8) to £18,060 (Build a Boiler based in BT67), 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 Hillsborough by posting a job with HaMuch and we will send it to extension builders in Hillsborough.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Hillsborough and Culcavy | £25 | £170 |
| Underpin A Building near Lisburn | £24 | £164 |
| Underpin A Building near Maghaberry | £31 | £205 |
| Underpin A Building near Ballynahinch | £19 | £189 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Saintfield | £23 | £162 |
| Underpin A Building near Waringstown | £23 | £167 |
| Underpin A Building near Banbridge | £29 | £205 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Crumlin | £26 | £194 |
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 - £16,981

Two storey extension - £87,221

Build a timber frame extension - £25,481

Build a swimming pool - £80,481

Single storey extension - £44,616

Side return extension - £35,659

Install an RSJ - £1,681

Outbuilding - £9,481

Build a Mansard loft conversion - £51,481

Loft conversion - £28,883

Build a kitchen extension - £41,481

Hip to gable loft conversion - £41,481

Granny annexe - £86,481

Garden office - £9,481

Convert a Garage - £15,481

Garage - £17,981

Build a flat roof extension - £21,481

Build a dormer loft conversion - £41,481

Concrete foundations - £5,731

Convert a bungalow loft - £28,481

Convert a basement - £31,659