From £16,908
Trusted and professional extension builder in BT34. Experienced in all extension buildering work and keeping within budget and on quote. JDL Contra...
From £16,996
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,140
With extensive extension buildering experience, we provide reliable, high-quality workmanship at competitive prices. G K Contracts Building & Joine...
From £17,012
N W Doyle & Son is a trusted extension builder serving customers in BT34 and the surrounding area. Contact us to today to get a competitive quote f...

Underpinning ranges from £16,908 (JDL Contracts based in BT34) to £17,140 (G K Contracts Building & Joinery based in BT32), 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 BT34 by posting a job with HaMuch and we will send it to extension builders in BT34.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Kilkeel | £24 | £155 |
| Underpin A Building near Banbridge | £25 | £177 |
| Underpin A Building near Waringstown | £21 | £146 |
| Underpin A Building near Craigavon | £22 | £170 |
| Underpin A Building near Ballynahinch | £15 | £150 |
| Underpin A Building near Hillsborough and Culcavy | £21 | £141 |
| Underpin A Building near Maghaberry | £27 | £175 |
| Underpin A Building near Saintfield | £20 | £141 |
| Underpin A Building near Lisburn | £20 | £139 |
| Underpin A Building near Carryduff | £20 | £136 |
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 - £17,014

Two storey extension - £87,271

Build a timber frame extension - £25,514

Build a swimming pool - £80,514

Single storey extension - £45,280

Side return extension - £36,033

Install an RSJ - £1,714

Outbuilding - £9,514

Build a Mansard loft conversion - £51,514

Loft conversion - £29,194

Build a kitchen extension - £41,514

Hip to gable loft conversion - £41,514

Granny annexe - £86,514

Garden office - £9,514

Convert a Garage - £15,514

Garage - £18,014

Build a flat roof extension - £21,514

Build a dormer loft conversion - £41,514

Concrete foundations - £5,764

Convert a bungalow loft - £28,514

Convert a basement - £32,033