From £17,348
Our building services company Hinton & Moon Building Limited was only established in August 2022, but have been providing professional, trustworthy...
From £17,652
Need to find an Extension Builder near you for all your extension buildering work?
Avant-Garde Construction Group Limited provides a local,...
From £17,580
Relax... you have found a reliable extension builder in BN20. Hammonds Toon Design is a friendly and reliable company based in BN20 who consider no...
From £17,580
Livit Design&Build is a company serves people to renovate their bathrooms partially or from scratch. Livit Design&Build combines design and build t...
From £17,748
GREEN ROOM CONSTRUCTION is an established and experienced local extension builder in BN20. Please contact us for a free, no obligation quote and co...
From £16,980
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,356
Need to find an Extension Builder near you for all your extension buildering work?
BUILDERS OF SUSSEX LTD provides a local, trusted extensi...
From £17,188
Family run builders with high standards of workmanship and customer service, trading standards approved.
From £17,316
Experienced extension builder ready to quote for your work. Razvan Building Services Ltd is the best extension builder in BN20. No obligation free ...
From £17,260
Experienced extension builder ready to quote for your work. M Hone Brickwork is the best extension builder in BN20. No obligation free quotes and m...

Underpinning ranges from £16,980 (Pro For You based in BN22) to £17,748 (GREEN ROOM CONSTRUCTION based in BN22), 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 BN20 by posting a job with HaMuch and we will send it to extension builders in BN20.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Eastbourne | £32 | £245 |
| Underpin A Building near Seaford | £34 | £243 |
| Underpin A Building near Hailsham | £31 | £243 |
| Underpin A Building near Bexhill-on-Sea | £31 | £243 |
| Underpin A Building near Wealden | £35 | £256 |
| Underpin A Building near Hastings | £31 | £246 |
| Underpin A Building near Brighton and Hove | £35 | £251 |
| Underpin A Building near Brighton | £35 | £251 |
| Underpin A Building near Crowborough | £36 | £258 |
| Underpin A Building near Burgess Hill | £36 | £240 |
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 - £17,401

Two storey extension - £87,851

Build a timber frame extension - £25,901

Build a swimming pool - £80,901

Single storey extension - £53,016

Side return extension - £40,384

Install an RSJ - £2,101

Outbuilding - £9,901

Build a Mansard loft conversion - £51,901

Loft conversion - £32,820

Build a kitchen extension - £41,901

Hip to gable loft conversion - £41,901

Granny annexe - £86,901

Garden office - £9,901

Convert a Garage - £15,901

Garage - £18,401

Build a flat roof extension - £21,901

Build a dormer loft conversion - £41,901

Concrete foundations - £6,151

Convert a bungalow loft - £28,901

Convert a basement - £36,384