From £17,452
Dub Solutions is a trusted extension builder serving customers in SL4 and the surrounding area. Contact us to today to get a competitive quote for ...
From £17,884
CONSTRUCTION CONNECTIONS LTD are here to help customers who need an Extension Builder in SL4. We offer a competitive rate to complete all your exte...
From £17,412
Abodde Housing is an established and experienced local extension builder in SL4. Please contact us for a free, no obligation quote and competitive ...
From £17,892
Rockfort Construction Ltd is a Buckinghamshire based construction company who offer a professional service; specialising in the construction of bes...
From £18,012
Design is our form of communication with the environment. Empathy and understanding is our attitude towards the customer. Responsibility and knowle...
From £17,860
Ani Mokashi is an established and experienced local extension builder in SL4. Please contact us for a free, no obligation quote and competitive rat...
From £17,820
Need to find an Extension Builder near you for all your extension buildering work?
Morpheus Gym Design provides a local, trusted extension ...
From £17,436
Trusted and professional extension builder in SL4. Experienced in all extension buildering work and keeping within budget and on quote. WARD & CO C...
From £17,876
Avenue92 is an established extension buildering business in SL4. We come highly recommended and provide competitive quotes for your work.
From £17,812
Need to find an Extension Builder near you for all your extension buildering work?
Dina Kashap provides a local, trusted extension builderi...

Underpinning ranges from £17,412 (Abodde Housing based in SL4) to £18,012 (ELINA YUKUMA DESIGN based in SL4), 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 SL4 by posting a job with HaMuch and we will send it to extension builders in SL4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Windsor | £41 | £271 |
| Underpin A Building near Windsor & Maidenhead | £42 | £272 |
| Underpin A Building near Slough | £42 | £272 |
| Underpin A Building near Egham | £42 | £266 |
| Underpin A Building near Ascot | £41 | £276 |
| Underpin A Building near Maidenhead | £41 | £273 |
| Underpin A Building near Staines-upon-Thames | £42 | £269 |
| Underpin A Building near Bracknell Forest | £41 | £287 |
| Underpin A Building near Bracknell | £41 | £286 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
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 - £17,746

Two storey extension - £88,368

Build a timber frame extension - £26,246

Build a swimming pool - £81,246

Single storey extension - £59,912

Side return extension - £44,263

Install an RSJ - £2,446

Outbuilding - £10,246

Build a Mansard loft conversion - £52,246

Loft conversion - £36,053

Build a kitchen extension - £42,246

Hip to gable loft conversion - £42,246

Granny annexe - £87,246

Garden office - £10,246

Convert a Garage - £16,246

Garage - £18,746

Build a flat roof extension - £22,246

Build a dormer loft conversion - £42,246

Concrete foundations - £6,496

Convert a bungalow loft - £29,246

Convert a basement - £40,263