From £17,892
Need an Extension Builder in Amersham? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for man...
From £17,780
Member since August 2026
Relax... you have found a reliable extension builder in Amersham. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in Amersha...
From £17,692
Need an Extension Builder in Amersham? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many ...
From £17,780
Trusted and professional extension builder in Amersham. Experienced in all extension buildering work and keeping within budget and on quote. DC Bui...
From £17,812
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,804
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £17,924
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,420
NISUP BUILDING SERVICES Company specializes in the domestic and commercial building industry :1. Refurbishm...
From £17,932
Krystian Wojasiewicz is a trusted extension builder serving customers in Amersham and the surrounding area. Contact us to today to get a competitiv...
From £17,932
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...

Underpinning ranges from £17,420 (Nisup Building Services based in HA8) to £17,932 (Krystian Wojasiewicz based in HA9), 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 Amersham by posting a job with HaMuch and we will send it to extension builders in Amersham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near Rickmansworth | £42 | £278 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near Berkhamsted | £41 | £263 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Hemel Hempstead | £42 | £270 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Watford | £43 | £278 |
| Underpin A Building near Wycombe | £39 | £271 |
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 - £17,797

Two storey extension - £88,445

Build a timber frame extension - £26,297

Build a swimming pool - £81,297

Single storey extension - £60,936

Side return extension - £44,839

Install an RSJ - £2,497

Outbuilding - £10,297

Build a Mansard loft conversion - £52,297

Loft conversion - £36,533

Build a kitchen extension - £42,297

Hip to gable loft conversion - £42,297

Granny annexe - £87,297

Garden office - £10,297

Convert a Garage - £16,297

Garage - £18,797

Build a flat roof extension - £22,297

Build a dormer loft conversion - £42,297

Concrete foundations - £6,547

Convert a bungalow loft - £29,297

Convert a basement - £40,839