Mariusz Mika
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...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
K A Griffin General Builder is an established extension buildering business in PO21. We come highly recommended and provide competitive quotes for ...
Trusted and professional extension builder in PO21. Experienced in all extension buildering work and keeping within budget and on quote. Paul Ramse...
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 £17,212
E C Builders Ltd is an established extension buildering business in PO21. We come highly recommended and provide competitive quotes for your work.<...
From £17,660
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 £17,276
Trusted and professional extension builder in PO21. Experienced in all extension buildering work and keeping within budget and on quote. Tim Open h...
From £17,604
we are a craftsmen led carpenty and construction business delivering domestic renovations, extensions, kitchens, bathrooms and finely crafted bespo...

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 | £241 |
| Underpin A Building near Rustington | £35 | £242 |
| Underpin A Building near Havant & Waterloo | £35 | £248 |
| Underpin A Building near Havant | £35 | £249 |
| Underpin A Building near Worthing | £35 | £249 |
| Underpin A Building near Waterlooville | £36 | £250 |
| Underpin A Building near Horndean | £36 | £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 - £17,459

Two storey extension - £87,939

Build a timber frame extension - £25,959

Build a swimming pool - £80,959

Single storey extension - £54,184

Side return extension - £41,041

Install an RSJ - £2,159

Outbuilding - £9,959

Build a Mansard loft conversion - £51,959

Loft conversion - £33,368

Build a kitchen extension - £41,959

Hip to gable loft conversion - £41,959

Granny annexe - £86,959

Garden office - £9,959

Convert a Garage - £15,959

Garage - £18,459

Build a flat roof extension - £21,959

Build a dormer loft conversion - £41,959

Concrete foundations - £6,209

Convert a bungalow loft - £28,959

Convert a basement - £37,041