From £17,548
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in CR3. No obligation free quotes ...
1 review
From £17,692
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £17,524
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £17,892
Need an Extension Builder in CR3? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £17,692
Need an Extension Builder in CR3? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many years...
From £17,652
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £17,804
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £18,524
Buci builders ltd is a trusted extension builder serving customers in CR3 and the surrounding area. Contact us to today to get a competitive quote ...
From £17,924
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,812
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in CR3. Please contact us for a free, no obligat...

Underpinning ranges from £17,524 (SH Enterprise based in EC1V) to £18,524 (Buci builders ltd based in SE27), 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 CR3 by posting a job with HaMuch and we will send it to extension builders in CR3.
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 - £17,806

Two storey extension - £88,460

Build a timber frame extension - £26,306

Build a swimming pool - £81,306

Single storey extension - £61,128

Side return extension - £44,947

Install an RSJ - £2,506

Outbuilding - £10,306

Build a Mansard loft conversion - £52,306

Loft conversion - £36,623

Build a kitchen extension - £42,306

Hip to gable loft conversion - £42,306

Granny annexe - £87,306

Garden office - £10,306

Convert a Garage - £16,306

Garage - £18,806

Build a flat roof extension - £22,306

Build a dormer loft conversion - £42,306

Concrete foundations - £6,556

Convert a bungalow loft - £29,306

Convert a basement - £40,947