From £17,316
Coastal wall ties ltd are specialists in wall tie replacement, re-pointing and cavity Wall insulation removal serving the Sussex and Hampshire area...
From £17,164
Welcome to Kudos Building ltd, specialists in extensions, renovations, loft conversions, & all aspects of property maintanance in Worthing...
From £17,244
Relax... you have found a reliable extension builder in BN17. ONE BUILD is a friendly and reliable company based in BN17 who consider no job as too...
From £17,276
Trusted and professional extension builder in BN17. Experienced in all extension buildering work and keeping within budget and on quote. S J Peace ...
From £17,612
Relax... you have found a reliable extension builder in BN17. Haynes & Scott Developments is a friendly and reliable company based in BN17 who cons...
From £17,404
R J H CONSTRUCTION (SUSSEX)LTD are here to help customers who need an Extension Builder in BN17. We offer a competitive rate to complete all your e...
From £17,484
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,620
Experienced extension builder ready to quote for your work. C C OLEARY CONSTRUCTION is the best extension builder in BN17. No obligation free quote...
From £17,844
At Hive Interior Projects we are truly passionate about interiors, there is nothing we love more than bringing awe inspiring designs to life for ou...
From £17,276
M Wesley General Builder & Property Maintenance is a trusted extension builder serving customers in BN17 and the surrounding area. Contact us to to...

Underpinning ranges from £17,164 (KUDOS BUILDING LTD based in BN17) to £17,844 (Hive Interior Projects based in BN16), 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 BN17 by posting a job with HaMuch and we will send it to extension builders in BN17.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Littlehampton | £35 | £244 |
| Underpin A Building near Rustington | £36 | £246 |
| Underpin A Building near Arun | £35 | £241 |
| Underpin A Building near Bognor Regis | £35 | £247 |
| Underpin A Building near Worthing | £35 | £251 |
| Underpin A Building near Lancing | £37 | £251 |
| Underpin A Building near Chichester | £34 | £242 |
| Underpin A Building near Shoreham-by-Sea | £36 | £250 |
| Underpin A Building near Brighton | £35 | £251 |
| Underpin A Building near Brighton and Hove | £35 | £251 |
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 - £17,424

Two storey extension - £87,886

Build a timber frame extension - £25,924

Build a swimming pool - £80,924

Single storey extension - £53,480

Side return extension - £40,645

Install an RSJ - £2,124

Outbuilding - £9,924

Build a Mansard loft conversion - £51,924

Loft conversion - £33,038

Build a kitchen extension - £41,924

Hip to gable loft conversion - £41,924

Granny annexe - £86,924

Garden office - £9,924

Convert a Garage - £15,924

Garage - £18,424

Build a flat roof extension - £21,924

Build a dormer loft conversion - £41,924

Concrete foundations - £6,174

Convert a bungalow loft - £28,924

Convert a basement - £36,645