From £17,508
Need to find an Extension Builder near you for all your extension buildering work?
Tj's Fencing provides a local, trusted extension builder...
From £17,308
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,436
Extensions, Refurbishments & Loft ConversionsAt Keystone our mission is to help our clients imagine, design & build environments that enhance their...
From £17,612
Experienced extension builder ready to quote for your work. MRA CONSTRUCTION is the best extension builder in Mid Sussex. No obligation free quotes...
From £18,100
Rjscarpentryconstruction is a well established company with over 30 years of experience in the carpentry and construction industries
From £17,348
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,788
I have been in the building trade for over 20 years and run my own business for the last 10 years. I am very reliable and have plenty of experience...
From £17,356
HEVIN BUILDERS is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quotes for your wo...
From £17,860
TOLLEY CARPENTRY is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quotes for your ...
From £17,564
JG Brickwork Services Limited is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quo...

Underpinning ranges from £16,788 (JUST ONE BUILDING SERVICES based in RH11) to £18,100 (RJ's Carpentry Construction based in RH15), 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 Mid Sussex by posting a job with HaMuch and we will send it to extension builders in Mid Sussex.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Mid Sussex | £35 | £261 |
| Underpin A Building near Haywards Heath | £35 | £256 |
| Underpin A Building near Burgess Hill | £36 | £240 |
| Underpin A Building near Crawley | £38 | £255 |
| Underpin A Building near East Grinstead | £37 | £259 |
| Underpin A Building near Horsham | £38 | £265 |
| Underpin A Building near Horley | £38 | £258 |
| Underpin A Building near Crowborough | £36 | £258 |
| Underpin A Building near Brighton and Hove | £35 | £251 |
| Underpin A Building near Redhill | £41 | £269 |
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 - £17,488

Two storey extension - £87,982

Build a timber frame extension - £25,988

Build a swimming pool - £80,988

Single storey extension - £54,760

Side return extension - £41,365

Install an RSJ - £2,188

Outbuilding - £9,988

Build a Mansard loft conversion - £51,988

Loft conversion - £33,638

Build a kitchen extension - £41,988

Hip to gable loft conversion - £41,988

Granny annexe - £86,988

Garden office - £9,988

Convert a Garage - £15,988

Garage - £18,488

Build a flat roof extension - £21,988

Build a dormer loft conversion - £41,988

Concrete foundations - £6,238

Convert a bungalow loft - £28,988

Convert a basement - £37,365