From £16,860
Power Construction is an established and experienced local extension builder in Knockmenagh. Please contact us for a free, no obligation quote and ...
From £16,948
Trusted and professional extension builder in Knockmenagh. Experienced in all work and keeping within budget and on quote. The Method Group have m...
From £17,036
Experienced extension builder ready to quote for your work. Terry Design is the best extension builder in Knockmenagh. No obligation free quotes an...
From £16,804
R.J Builders are here to help customers who need an Extension Builder in Knockmenagh. We offer a competitive rate to complete all your jobs to pro...
From £17,140
With extensive experience, we provide reliable, high-quality workmanship at competitive prices. G K Contracts Building & Joinery understands the i...
From £16,900
T.I Building is a trusted extension builder serving customers in Knockmenagh and the surrounding area. Contact us to today to get a competitive quo...
From £16,884
Relax... you have found a reliable extension builder in Knockmenagh. Finch Construction NI is a friendly and reliable company based in Knockmenagh ...
From £17,284
JP&S Construction Ltd is an established business in Knockmenagh. We come highly recommended and provide competitive quotes for your work.
From £16,836
Trusted and professional extension builder in Knockmenagh. Experienced in all work and keeping within budget and on quote. Belfast Loft Company ha...
From £17,516
Need to find an Extension Builder near you for all your work?
GMC Construction provides a local, trusted service in and around Knockmenag...

Underpinning ranges from £16,804 (R.J Builders based in BT67) to £17,516 (GMC Construction based in BT70), 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 Knockmenagh by posting a job with HaMuch and we will send it to extension builders in Knockmenagh.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Waringstown | £21 | £146 |
| Underpin A Building near Craigavon | £22 | £170 |
| Underpin A Building near Maghaberry | £27 | £175 |
| Underpin A Building near Banbridge | £25 | £177 |
| Underpin A Building near Hillsborough and Culcavy | £21 | £141 |
| Underpin A Building near Coalisland | £21 | £173 |
| Underpin A Building near Lisburn | £20 | £139 |
| Underpin A Building near Crumlin | £22 | £168 |
| Underpin A Building near Dungannon | £23 | £186 |
| 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 - £17,021

Two storey extension - £87,281

Build a timber frame extension - £25,521

Build a swimming pool - £80,521

Single storey extension - £45,416

Side return extension - £36,109

Install an RSJ - £1,721

Outbuilding - £9,521

Build a Mansard loft conversion - £51,521

Loft conversion - £29,258

Build a kitchen extension - £41,521

Hip to gable loft conversion - £41,521

Granny annexe - £86,521

Garden office - £9,521

Convert a Garage - £15,521

Garage - £18,021

Build a flat roof extension - £21,521

Build a dormer loft conversion - £41,521

Concrete foundations - £5,771

Convert a bungalow loft - £28,521

Convert a basement - £32,109