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Select your affordable Surrey extension builder
Relax... you have found a reliable extension builder in Surrey. GDW Construction is a friendly and reliable company based in Surrey who consider no...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in Surrey. We offer a competitive rate to complete all your extension bui...
From £18,700
Sebastian Banga
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
Relax... you have found a reliable extension builder in Surrey. D & R Roofing & Loft Conversions, Building & Design is a friendly and reliable comp...
Hilton building contractors ltd is a trusted extension builder serving customers in Surrey and the surrounding area. Contact us to today to get a c...
Relax... you have found a reliable extension builder in Surrey. Amazing Space Design and Build Ltd. is a friendly and reliable company based in Sur...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in Surrey. L M G Building Services (London) Ltd is a friendly and reliable company based in Su...
Experienced extension builder ready to quote for your work. Aviemore Building Contractors Ltd is the best extension builder in Surrey. No obligatio...

Underpinning ranges from £17,436 (Masters Property Services based in SM5) to £18,700 (Banga Decoration based in CR7), 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 Surrey by posting a job with HaMuch and we will send it to extension builders in Surrey.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Caterham | £43 | £271 |
| Underpin A Building near Redhill | £41 | £269 |
| Underpin A Building near Reigate & Banstead | £41 | £271 |
| Underpin A Building near Croydon | £42 | £267 |
| Underpin A Building near Reigate | £40 | £270 |
| Underpin A Building near Tadworth | £41 | £271 |
| Underpin A Building near Sutton | £43 | £274 |
| Underpin A Building near Epsom | £44 | £275 |
| Underpin A Building near Ewell | £44 | £275 |
| Underpin A Building near Horley | £38 | £258 |
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 - £17,839

Two storey extension - £88,509

Build a timber frame extension - £26,339

Build a swimming pool - £81,339

Single storey extension - £61,784

Side return extension - £45,316

Install an RSJ - £2,539

Outbuilding - £10,339

Build a Mansard loft conversion - £52,339

Loft conversion - £36,930

Build a kitchen extension - £42,339

Hip to gable loft conversion - £42,339

Granny annexe - £87,339

Garden office - £10,339

Convert a Garage - £16,339

Garage - £18,839

Build a flat roof extension - £22,339

Build a dormer loft conversion - £42,339

Concrete foundations - £6,589

Convert a bungalow loft - £29,339

Convert a basement - £41,316