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...
New Finishes is a trusted extension builder serving customers in Whetstone and the surrounding area. Contact us to today to get a competitive quote...
Relax... you have found a reliable extension builder in Whetstone. Pavillion Building Services is a friendly and reliable company based in Whetston...
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 Whetstone and the surrounding area. Contact us to today to get a competit...
Wittick Building Ltd is a trusted extension builder serving customers in Whetstone and the surrounding area. Contact us to today to get a competiti...
Need an Extension Builder in Whetstone? Roni Lofts Conversions Ltd has been helping local clients (10 mile radius) with their extension buildering ...
Ivaylo Shkodrov
Extremely reliable service . Flexibility, correct, listening customer. Wide experience.
Relax... you have found a reliable extension builder in Whetstone. Taylor Construction Services Ltd is a friendly and reliable company based in Whe...

Underpinning ranges from £16,820 (Onyx Iv 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 Whetstone by posting a job with HaMuch and we will send it to extension builders in Whetstone.
"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 - £17,567

Two storey extension - £88,101

Build a timber frame extension - £26,067

Build a swimming pool - £81,067

Single storey extension - £56,344

Side return extension - £42,256

Install an RSJ - £2,267

Outbuilding - £10,067

Build a Mansard loft conversion - £52,067

Loft conversion - £34,380

Build a kitchen extension - £42,067

Hip to gable loft conversion - £42,067

Granny annexe - £87,067

Garden office - £10,067

Convert a Garage - £16,067

Garage - £18,567

Build a flat roof extension - £22,067

Build a dormer loft conversion - £42,067

Concrete foundations - £6,317

Convert a bungalow loft - £29,067

Convert a basement - £38,256