Dimitar Vakavliev
We are reliable tradesmen delivering quality works with attention to detail
Need the extension buildering job done quickly without breaking the bank? WT Construction Service Ltd offer fast, reliable, and affordable extensio...
Need the extension buildering job done quickly without breaking the bank? Swiftdale Developments Ltd offer fast, reliable, and affordable extension...
New Finishes is a trusted extension builder serving customers in North Finchley and the surrounding area. Contact us to today to get a competitive ...
Relax... you have found a reliable extension builder in North Finchley. Pavillion Building Services is a friendly and reliable company based in Nor...
Rafal Szczepanski
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
Homeland Building Ltd is a trusted extension builder serving customers in North Finchley and the surrounding area. Contact us to today to get a com...
Wittick Building Ltd is a trusted extension builder serving customers in North Finchley and the surrounding area. Contact us to today to get a comp...
Need an Extension Builder in North Finchley? Roni Lofts Conversions Ltd has been helping local clients (10 mile radius) with their extension builde...
SJ Expert Building Services are here to help customers who need an Extension Builder in North Finchley. We offer a competitive rate to complete all...

Underpinning ranges from £17,028 (Bellator Construction Ltd based in N11) to £18,060 (Rafix Building based in EN4), 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 North Finchley by posting a job with HaMuch and we will send it to extension builders in North Finchley.
"Underpinning" - N20, job posted 03/01/26
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 - £17,659

Two storey extension - £88,239

Build a timber frame extension - £26,159

Build a swimming pool - £81,159

Single storey extension - £58,184

Side return extension - £43,291

Install an RSJ - £2,359

Outbuilding - £10,159

Build a Mansard loft conversion - £52,159

Loft conversion - £35,243

Build a kitchen extension - £42,159

Hip to gable loft conversion - £42,159

Granny annexe - £87,159

Garden office - £10,159

Convert a Garage - £16,159

Garage - £18,659

Build a flat roof extension - £22,159

Build a dormer loft conversion - £42,159

Concrete foundations - £6,409

Convert a bungalow loft - £29,159

Convert a basement - £39,291