From £17,660
Mr R Peterson is a trusted extension builder serving customers in PO21 and the surrounding area. Contact us to today to get a competitive quote for...
From £17,628
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,436
MBuilding are here to help customers who need an Extension Builder in PO21. We offer a competitive rate to complete all your extension buildering j...
From £17,212
E C Builders Ltd is an established extension buildering business in PO21. We come highly recommended and provide competitive quotes for your work.<...
From £17,604
we are a craftsmen led carpenty and construction business delivering domestic renovations, extensions, kitchens, bathrooms and finely crafted bespo...
From £17,724
Paul Stevens is a trusted extension builder serving customers in PO21 and the surrounding area. Contact us to today to get a competitive quote for ...
From £17,268
Trusted and professional extension builder in PO21. Experienced in all extension buildering work and keeping within budget and on quote. Paul Ramse...
From £17,556
K A Griffin General Builder is an established extension buildering business in PO21. We come highly recommended and provide competitive quotes for ...
From £17,572
A&K Invest is an established and experienced local extension builder in PO21. Please contact us for a free, no obligation quote and competitive rat...

Underpinning ranges from £17,212 (E C Builders Ltd based in PO21) to £17,724 (Paul Stevens based in PO22), 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 PO21 by posting a job with HaMuch and we will send it to extension builders in PO21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Bognor Regis | £35 | £247 |
| Underpin A Building near Chichester | £34 | £242 |
| Underpin A Building near Arun | £35 | £241 |
| Underpin A Building near Littlehampton | £35 | £244 |
| Underpin A Building near Rustington | £36 | £246 |
| Underpin A Building near Havant & Waterloo | £35 | £248 |
| Underpin A Building near Havant | £35 | £249 |
| Underpin A Building near Worthing | £35 | £251 |
| Underpin A Building near Waterlooville | £36 | £250 |
| Underpin A Building near Horndean | £35 | £253 |
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 - £17,489

Two storey extension - £87,983

Build a timber frame extension - £25,989

Build a swimming pool - £80,989

Single storey extension - £54,776

Side return extension - £41,374

Install an RSJ - £2,189

Outbuilding - £9,989

Build a Mansard loft conversion - £51,989

Loft conversion - £33,645

Build a kitchen extension - £41,989

Hip to gable loft conversion - £41,989

Granny annexe - £86,989

Garden office - £9,989

Convert a Garage - £15,989

Garage - £18,489

Build a flat roof extension - £21,989

Build a dormer loft conversion - £41,989

Concrete foundations - £6,239

Convert a bungalow loft - £28,989

Convert a basement - £37,374