From £17,900
Seven Sisters, N15
Need to find an Extension Builder near you for all your extension buildering work?
Greg's Builders provides a local, trusted extension buil...
From £17,756
Need an Extension Builder in N15? Building Noer General Art Ltd has been helping local clients (5 mile radius) with their extension buildering jobs...
From £17,892
Greater London, N15
25 Years after achieving and completing many construction projects in my professional career ( , I decided t...
From £17,812
Londonderry, N15
Need an Extension Builder in N15? F has been helping local clients (5 mile radius) with their extension buildering jobs for many years. Get a quote...
From £17,660
Build 4 London is an established extension buildering business in N15. We come highly recommended and provide competitive quotes for your work.
...From £17,596
Seven Sisters, N15
Azzep Building Services are here to help customers who need an Extension Builder in N15. We offer a competitive rate to complete all your extension...
From £17,756
Michael Collins Builders are experts in domestic conversions and extensions - drawing on over 25 years experience in the trade. We have built up a ...
From £17,628
GG CONSTRUCTION LTD is a trusted extension builder serving customers in N15 and the surrounding area. Contact us to today to get a competitive quot...
From £17,756
KJV CONSTRUCTION LTD is an established and experienced local extension builder in N15. Please contact us for a free, no obligation quote and compet...

Underpinning ranges from £17,100 (ADD CONSTRUCTION (LONDON) LTD based in N15) to £17,900 (Greg's Builders based in N15), 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 N15 by posting a job with HaMuch and we will send it to extension builders in N15.
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 - £17,686

Two storey extension - £88,278

Build a timber frame extension - £26,186

Build a swimming pool - £81,186

Single storey extension - £58,712

Side return extension - £43,588

Install an RSJ - £2,386

Outbuilding - £10,186

Build a Mansard loft conversion - £52,186

Loft conversion - £35,490

Build a kitchen extension - £42,186

Hip to gable loft conversion - £42,186

Granny annexe - £87,186

Garden office - £10,186

Convert a Garage - £16,186

Garage - £18,686

Build a flat roof extension - £22,186

Build a dormer loft conversion - £42,186

Concrete foundations - £6,436

Convert a bungalow loft - £29,186

Convert a basement - £39,588