From £18,116
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in SS14 and the surrounding area. Contact us to today to get a com...
From £17,380
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in SS14. No obligation free quot...
From £17,564
Hyde Building Ltd are here to help customers who need an Extension Builder in SS14. We offer a competitive rate to complete all your extension buil...
From £17,860
Need an Extension Builder in SS14? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buildering j...
From £17,508
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
From £17,812
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in SS14. Please contact us for a free, no obliga...
From £17,684
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in SS14. No obligation free quotes and ...
From £17,380
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,924
Nouvell Decor is a trusted extension builder serving customers in SS14 and the surrounding area. Contact us to today to get a competitive quote for...
From £17,812
skilled worker who specializes in completing a wide range of building and renovation projects

Underpinning ranges from £17,380 (CIA Construction Limited based in RM18) to £18,116 (HOUSE BUILDING SERVICES LIMITED based in DA16), 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 SS14 by posting a job with HaMuch and we will send it to extension builders in SS14.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Basildon | £39 | £251 |
| Underpin A Building near Billericay | £38 | £248 |
| Underpin A Building near Wickford | £39 | £255 |
| Underpin A Building near Stanford-le-Hope | £40 | £254 |
| Underpin A Building near Thundersley | £38 | £251 |
| Underpin A Building near Rayleigh | £39 | £252 |
| Underpin A Building near Canvey Island | £39 | £256 |
| Underpin A Building near Brentwood | £39 | £255 |
| Underpin A Building near Thurrock | £41 | £260 |
| Underpin A Building near Chafford Hundred | £41 | £261 |
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 - £17,704

Two storey extension - £88,306

Build a timber frame extension - £26,204

Build a swimming pool - £81,204

Single storey extension - £59,080

Side return extension - £43,795

Install an RSJ - £2,404

Outbuilding - £10,204

Build a Mansard loft conversion - £52,204

Loft conversion - £35,663

Build a kitchen extension - £42,204

Hip to gable loft conversion - £42,204

Granny annexe - £87,204

Garden office - £10,204

Convert a Garage - £16,204

Garage - £18,704

Build a flat roof extension - £22,204

Build a dormer loft conversion - £42,204

Concrete foundations - £6,454

Convert a bungalow loft - £29,204

Convert a basement - £39,795