From £21,360
Power Construction is an established and experienced local extension builder in Knockmenagh. Please contact us for a free, no obligation quote and ...
From £21,448
Trusted and professional extension builder in Knockmenagh. Experienced in all work and keeping within budget and on quote. The Method Group have m...
From £21,536
Experienced extension builder ready to quote for your work. Terry Design is the best extension builder in Knockmenagh. No obligation free quotes an...
From £21,304
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 £21,640
With extensive experience, we provide reliable, high-quality workmanship at competitive prices. G K Contracts Building & Joinery understands the i...
From £21,400
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 £21,384
Relax... you have found a reliable extension builder in Knockmenagh. Finch Construction NI is a friendly and reliable company based in Knockmenagh ...
From £21,784
JP&S Construction Ltd is an established business in Knockmenagh. We come highly recommended and provide competitive quotes for your work.
From £21,336
Trusted and professional extension builder in Knockmenagh. Experienced in all work and keeping within budget and on quote. Belfast Loft Company ha...
From £22,016
Need to find an Extension Builder near you for all your work?
GMC Construction provides a local, trusted service in and around Knockmenag...

A flat roof extension ranges from the cheapest of £21,304 (R.J Builders based in BT67) to the dearest of £22,016 (GMC Construction based in BT70), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Knockmenagh by posting a job with HaMuch. We'll send it to extension builders in Knockmenagh.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Waringstown | £21 | £146 |
| Build A Flat Roof Extension near Craigavon | £22 | £170 |
| Build A Flat Roof Extension near Maghaberry | £27 | £175 |
| Build A Flat Roof Extension near Banbridge | £25 | £177 |
| Build A Flat Roof Extension near Hillsborough and Culcavy | £21 | £141 |
| Build A Flat Roof Extension near Coalisland | £21 | £173 |
| Build A Flat Roof Extension near Lisburn | £20 | £139 |
| Build A Flat Roof Extension near Crumlin | £22 | £168 |
| Build A Flat Roof Extension near Dungannon | £23 | £186 |
| Build A Flat Roof Extension 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