From £17,500
Our building services company Added Space Ltd have over fifty years combined experience. We have been helping customers in Harlow and the surroundi...
From £20,652
We are small building company working for the residential and domestic properties? We work on all types of buildings creating Loft conversion and H...
From £17,340
Urban lofts and extensions ltd is an established extension buildering business in CM20. We come highly recommended and provide competitive quotes f...
From £17,668
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,668
Welstrong Construction is a team of friends and brothers who enjoy working in the building industry and aim to make sure every customer is fully sa...
From £17,556
With over 20 years of experience we specialise in fit-outs and maximising your living space. Lofts, extensions, basements, new builds and domestic ...
From £17,412
J G BUILDING SERVICES is a trusted extension builder serving customers in CM20 and the surrounding area. Contact us to today to get a competitive q...
From £17,580
VIBE CONSTRUCTION LIMITED is an established extension buildering business in CM20. We come highly recommended and provide competitive quotes for yo...
From £17,852
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,524
Need an Extension Builder in CM20? Loft in Space London has been helping local clients (20 mile radius) with their extension buildering jobs for ma...

Underpinning ranges from £17,340 (Urban lofts and extensions ltd based in cm20) to £20,652 (Essex loft extensions Ltd based in CM20), 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 CM20 by posting a job with HaMuch and we will send it to extension builders in CM20.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Harlow | £43 | £288 |
| Underpin A Building near Hoddesdon | £46 | £296 |
| Underpin A Building near Ware | £47 | £296 |
| Underpin A Building near Bishop's Stortford | £42 | £264 |
| Underpin A Building near Cheshunt | £48 | £285 |
| Underpin A Building near Epping Forest | £44 | £273 |
| Underpin A Building near Hertford | £46 | £289 |
| Underpin A Building near Loughton | £44 | £273 |
| Underpin A Building near East Hertfordshire | £44 | £289 |
| Underpin A Building near Welwyn Garden City | £42 | £268 |
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 - £17,875

Two storey extension - £88,563

Build a timber frame extension - £26,375

Build a swimming pool - £81,375

Single storey extension - £62,504

Side return extension - £45,721

Install an RSJ - £2,575

Outbuilding - £10,375

Build a Mansard loft conversion - £52,375

Loft conversion - £37,268

Build a kitchen extension - £42,375

Hip to gable loft conversion - £42,375

Granny annexe - £87,375

Garden office - £10,375

Convert a Garage - £16,375

Garage - £18,875

Build a flat roof extension - £22,375

Build a dormer loft conversion - £42,375

Concrete foundations - £6,625

Convert a bungalow loft - £29,375

Convert a basement - £41,721