From £17,420
Trusted and professional extension builder in Bourne. Experienced in all extension buildering work and keeping within budget and on quote. RBAM Con...
From £17,564
Trinity Green Building Contractors are here to help customers who need an Extension Builder in Bourne. We offer a competitive rate to complete all ...
From £17,580
Trusted and professional extension builder in Bourne. Experienced in all extension buildering work and keeping within budget and on quote. Moores R...
From £17,388
Your Local builders in Peterborough
GMF Builders is owned and managed by Graham Fuller who has approximately 23 years experience in the ...
From £17,148
Addison are here to help customers who need an Extension Builder in Bourne. We offer a competitive rate to complete all your extension buildering j...
From £17,900
Member since January 2026
Welcome to Price & Sons! We are a building company based in Peterborough. If you are interested in a quote please get in touch with us!
From £17,660
DAR CONSTRUCTION are here to help customers who need an Extension Builder in Bourne. We offer a competitive rate to complete all your extension bui...
From £17,068
BRIARWOOD BUILDING CONTRS LTD is an established extension buildering business in Bourne. We come highly recommended and provide competitive quotes ...
From £17,980
Need an Extension Builder in Bourne? D H S Dima Home Improvement Services has been helping local clients (20 mile radius) with their extension buil...
From £17,604
Lauren Builders are a domestic and commercial building company based in Peterborough, and is owned and run by Father & Son, Mick & Lee Gapper, who ...

Underpinning ranges from £17,068 (BRIARWOOD BUILDING CONTRS LTD based in NG32) to £17,980 (D H S Dima Home Improvement Services based in PE21), 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 Bourne by posting a job with HaMuch and we will send it to extension builders in Bourne.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Spalding | £32 | £238 |
| Underpin A Building near Stamford | £35 | £248 |
| Underpin A Building near Grantham | £38 | £228 |
| Underpin A Building near Peterborough | £40 | £281 |
| Underpin A Building near Boston | £28 | £262 |
| Underpin A Building near Melton Mowbray | £31 | £222 |
| Underpin A Building near Wisbech | £34 | £255 |
| Underpin A Building near Corby | £30 | £214 |
| Underpin A Building near Huntingdonshire | £36 | £290 |
| Underpin A Building near Newark-on-Trent | £33 | £241 |
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 - £17,531

Two storey extension - £88,047

Build a timber frame extension - £26,031

Build a swimming pool - £81,031

Single storey extension - £55,624

Side return extension - £41,851

Install an RSJ - £2,231

Outbuilding - £10,031

Build a Mansard loft conversion - £52,031

Loft conversion - £34,043

Build a kitchen extension - £42,031

Hip to gable loft conversion - £42,031

Granny annexe - £87,031

Garden office - £10,031

Convert a Garage - £16,031

Garage - £18,531

Build a flat roof extension - £22,031

Build a dormer loft conversion - £42,031

Concrete foundations - £6,281

Convert a bungalow loft - £29,031

Convert a basement - £37,851