From £16,884
Relax... you have found a reliable extension builder in BT28. Finch Construction NI is a friendly and reliable company based in BT28 who consider n...
From £16,900
T.I Building is a trusted extension builder serving customers in BT28 and the surrounding area. Contact us to today to get a competitive quote for ...
From £16,836
Trusted and professional extension builder in BT28. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £16,676
Trusted and professional extension builder in BT28. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
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 BT28. SM Plumbing & Heating is a friendly and reliable company based in BT28 who consider n...
From £16,884
Designco Ltd is an established extension buildering business in BT28. We come highly recommended and provide competitive quotes for your work.
...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 £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 BT28 by posting a job with HaMuch and we will send it to extension builders in BT28.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Lisburn | £24 | £164 |
| Underpin A Building near Hillsborough and Culcavy | £25 | £170 |
| Underpin A Building near Maghaberry | £31 | £205 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Crumlin | £26 | £194 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Waringstown | £23 | £167 |
| Underpin A Building near Saintfield | £23 | £162 |
| Underpin A Building near Ballynahinch | £19 | £189 |
| Underpin A Building near Holywood | £23 | £159 |
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 - £16,961

Two storey extension - £87,191

Build a timber frame extension - £25,461

Build a swimming pool - £80,461

Single storey extension - £44,216

Side return extension - £35,434

Install an RSJ - £1,661

Outbuilding - £9,461

Build a Mansard loft conversion - £51,461

Loft conversion - £28,695

Build a kitchen extension - £41,461

Hip to gable loft conversion - £41,461

Granny annexe - £86,461

Garden office - £9,461

Convert a Garage - £15,461

Garage - £17,961

Build a flat roof extension - £21,461

Build a dormer loft conversion - £41,461

Concrete foundations - £5,711

Convert a bungalow loft - £28,461

Convert a basement - £31,434