From £17,548
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in RH6. No obligation free quotes ...
From £17,644
Watch our short video highlighting all our expertise and services here:
more than 10 y...
From £17,956
Albdeco Builders & Decorators Ltd is a trusted extension builder serving customers in RH6 and the surrounding area. Contact us to today to get a co...
From £18,524
Buci builders ltd is a trusted extension builder serving customers in RH6 and the surrounding area. Contact us to today to get a competitive quote ...
From £17,692
Gb construction are here to help customers who need an Extension Builder in RH6. We offer a competitive rate to complete all your extension builde...
From £18,700
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
From £17,372
Need an Extension Builder in RH6? MPS Home Improvements Ltd has been helping local clients (20 mile radius) with their extension buildering jobs fo...
From £17,660
Homeowners look no further if you want a qualified extension builder to work in your home. LCD Pixel Construction Ltd are tidy and neat, providing ...
From £17,828
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,420
Masonic Plumbing and Heating Ltd are here to help customers who need an Extension Builder in RH6. We offer a competitive rate to complete all your ...

Underpinning ranges from £17,372 (MPS Home Improvements Ltd based in RH14) to £18,700 (Banga Decoration based in CR7), 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 RH6 by posting a job with HaMuch and we will send it to extension builders in RH6.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Horley | £38 | £258 |
| Underpin A Building near Crawley | £38 | £255 |
| Underpin A Building near Redhill | £41 | £269 |
| Underpin A Building near Reigate | £40 | £270 |
| Underpin A Building near East Grinstead | £37 | £259 |
| Underpin A Building near Reigate & Banstead | £41 | £271 |
| Underpin A Building near Caterham | £43 | £272 |
| Underpin A Building near Tadworth | £41 | £271 |
| Underpin A Building near Mid Sussex | £35 | £261 |
| Underpin A Building near Horsham | £38 | £265 |
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 - £17,834

Two storey extension - £88,502

Build a timber frame extension - £26,334

Build a swimming pool - £81,334

Single storey extension - £61,688

Side return extension - £45,262

Install an RSJ - £2,534

Outbuilding - £10,334

Build a Mansard loft conversion - £52,334

Loft conversion - £36,885

Build a kitchen extension - £42,334

Hip to gable loft conversion - £42,334

Granny annexe - £87,334

Garden office - £10,334

Convert a Garage - £16,334

Garage - £18,834

Build a flat roof extension - £22,334

Build a dormer loft conversion - £42,334

Concrete foundations - £6,584

Convert a bungalow loft - £29,334

Convert a basement - £41,262