From £17,100
Taylor Building & Maintenance Services is an established extension buildering business in RH18. We come highly recommended and provide competitive ...
From £17,540
Relax... you have found a reliable extension builder in RH18. HOWCROFTS BUILDING SERVICES is a friendly and reliable company based in RH18 who cons...
From £17,028
AJH Construction and Fencing is an established extension buildering business in RH18. We come highly recommended and provide competitive quotes fo...
From £17,556
Whitehouse Build & Design Ltd is an established and experienced local extension builder in RH18. Please contact us for a free, no obligation quote ...
From £17,724
GB Brickwork is a trusted extension builder serving customers in RH18 and the surrounding area. Contact us to today to get a competitive quote for ...
From £17,836
Trusted and professional extension builder in RH18. Experienced in all extension buildering work and keeping within budget and on quote. Dance & Co...
From £17,324
James Knott & Son Ltd are here to help customers who need an Extension Builder in RH18. We offer a competitive rate to complete all your extension ...
From £17,652
Duaris Ltd is an established extension buildering business in RH18. We come highly recommended and provide competitive quotes for your work.
From £17,788
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £17,228
Apsley Wall Ltd is an established extension buildering business in RH18. We come highly recommended and provide competitive quotes for your work.

Underpinning ranges from £17,028 (AJH Construction and Fencing based in RH19) to £17,836 (Dance & Co Developments based in RH19), 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 RH18 by posting a job with HaMuch and we will send it to extension builders in RH18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near East Grinstead | £37 | £259 |
| Underpin A Building near Crowborough | £36 | £258 |
| Underpin A Building near Mid Sussex | £35 | £261 |
| Underpin A Building near Crawley | £38 | £255 |
| Underpin A Building near Haywards Heath | £35 | £256 |
| Underpin A Building near Horley | £38 | £258 |
| Underpin A Building near Tunbridge Wells | £37 | £258 |
| Underpin A Building near Burgess Hill | £36 | £240 |
| Underpin A Building near Wealden | £35 | £256 |
| Underpin A Building near Tonbridge | £38 | £254 |
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 - £17,478

Two storey extension - £87,966

Build a timber frame extension - £25,978

Build a swimming pool - £80,978

Single storey extension - £54,552

Side return extension - £41,248

Install an RSJ - £2,178

Outbuilding - £9,978

Build a Mansard loft conversion - £51,978

Loft conversion - £33,540

Build a kitchen extension - £41,978

Hip to gable loft conversion - £41,978

Granny annexe - £86,978

Garden office - £9,978

Convert a Garage - £15,978

Garage - £18,478

Build a flat roof extension - £21,978

Build a dormer loft conversion - £41,978

Concrete foundations - £6,228

Convert a bungalow loft - £28,978

Convert a basement - £37,248