From £17,724
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,588
Need to find an Extension Builder near you for all your extension buildering work?
Go-Large Design & Build Ltd provides a local, trusted ex...
From £17,916
BURCROFT BUILDERS is an established and experienced local extension builder in MK1. Please contact us for a free, no obligation quote and competiti...
From £17,564
At Building Better Spaces we have been fitting bespoke bathrooms for ten years.We pride ourselves on being the go-to bathroom fitters for d...
From £17,348
Need an Extension Builder in MK1? Highland Homes & Gardens has been helping local clients (20 mile radius) with their extension buildering jobs for...
From £17,652
Our building services company Dallcompanies Limited was established in May 2023, but have been helping customers in Milton Keynes and the surroundi...
From £17,564
Relax... you have found a reliable extension builder in MK1. GD RAWLINGS BUILDING is a friendly and reliable company based in MK1 who consider no j...
From £17,740
I am a British Gas trained engineer with a vast knowledge of all gas, central heating, and plumbing systems. Now working independently, I provide i...
From £17,540
Trusted and professional extension builder in MK1. Experienced in all extension buildering work and keeping within budget and on quote. Langton Bui...
From £17,772
Need to find an Extension Builder near you for all your extension buildering work?
Asanta Builder provides a local, trusted extension build...

Underpinning ranges from £17,348 (Highland Homes & Gardens based in MK4) to £17,916 (BURCROFT BUILDERS based in MK3), 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 MK1 by posting a job with HaMuch and we will send it to extension builders in MK1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Bletchley | £34 | £227 |
| Underpin A Building near Milton Keynes | £33 | £226 |
| Underpin A Building near Leighton Buzzard | £33 | £235 |
| Underpin A Building near Ampthill | £31 | £214 |
| Underpin A Building near Mid Bedfordshire | £34 | £225 |
| Underpin A Building near Aylesbury Vale | £34 | £230 |
| Underpin A Building near Dunstable | £36 | £235 |
| Underpin A Building near Aylesbury | £36 | £236 |
| Underpin A Building near Kempston | £37 | £230 |
| Underpin A Building near Bedford | £38 | £233 |
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 - £17,641

Two storey extension - £88,211

Build a timber frame extension - £26,141

Build a swimming pool - £81,141

Single storey extension - £57,816

Side return extension - £43,084

Install an RSJ - £2,341

Outbuilding - £10,141

Build a Mansard loft conversion - £52,141

Loft conversion - £35,070

Build a kitchen extension - £42,141

Hip to gable loft conversion - £42,141

Granny annexe - £87,141

Garden office - £10,141

Convert a Garage - £16,141

Garage - £18,641

Build a flat roof extension - £22,141

Build a dormer loft conversion - £42,141

Concrete foundations - £6,391

Convert a bungalow loft - £29,141

Convert a basement - £39,084