From £17,940
Need to find an Extension Builder near you for all your extension buildering work?
Main Construction provides a local, trusted extension bu...
From £17,508
Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in Arundel and the surrounding areas...
From £18,596
We are a Small Family run business with over 30 years experience in the building trade, Carpentry is my main trade, with NVQ Level 2.
From £17,372
Need an Extension Builder in Arundel? MPS Home Improvements Ltd has been helping local clients (20 mile radius) with their extension buildering job...
From £17,492
Member since August 2026
H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...
From £17,668
R S Construction (Surrey) is an established extension buildering business in Arundel. We come highly recommended and provide competitive quotes for...
From £17,612
Futureways Design and Build are here to help customers who need an Extension Builder in Arundel. We offer a competitive rate to complete all your e...
From £17,252
Park Building Services Ltd is a trusted extension builder serving customers in Arundel and the surrounding area. Contact us to today to get a compe...
From £17,700
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,876
Giles Dixon is an experienced Project Manager with over 30 years experience, having worked from the ground up starting in 1984 as an apprentice ele...

Underpinning ranges from £17,252 (Park Building Services Ltd based in PO9) to £18,596 (R&B Property Improvements based in PO9), 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 Arundel by posting a job with HaMuch and we will send it to extension builders in Arundel.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| 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 Bognor Regis | £35 | £247 |
| Underpin A Building near Chichester | £34 | £242 |
| Underpin A Building near Worthing | £35 | £251 |
| Underpin A Building near Lancing | £37 | £251 |
| Underpin A Building near Shoreham-by-Sea | £36 | £250 |
| Underpin A Building near Havant & Waterloo | £35 | £248 |
| Underpin A Building near Havant | £35 | £249 |
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 - £17,702

Two storey extension - £88,302

Build a timber frame extension - £26,202

Build a swimming pool - £81,202

Single storey extension - £59,032

Side return extension - £43,768

Install an RSJ - £2,402

Outbuilding - £10,202

Build a Mansard loft conversion - £52,202

Loft conversion - £35,640

Build a kitchen extension - £42,202

Hip to gable loft conversion - £42,202

Granny annexe - £87,202

Garden office - £10,202

Convert a Garage - £16,202

Garage - £18,702

Build a flat roof extension - £22,202

Build a dormer loft conversion - £42,202

Concrete foundations - £6,452

Convert a bungalow loft - £29,202

Convert a basement - £39,768