From £17,788
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,420
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,364
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,180
Trusted and professional extension builder in SN6. Experienced in all extension buildering work and keeping within budget and on quote. G R & Son h...
From £17,260
Dacol Services is Swindons number 1 property maintenance service.
Trusted by many letting agents, landlords, homeowners, and hoteliers.
From £17,644
BROWNS TOTAL DESIGN & BUILD LTD is an established and experienced local extension builder in SN6. Please contact us for a free, no obligation quote...
From £16,956
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,596
MJ solutions is an established and experienced local extension builder in SN6. Please contact us for a free, no obligation quote and competitive r...
From £17,572
We have a skilled and dedicated team of professional tradesmen to carry out all your requirements. Whether you are looking to build, extend or upgr...
From £17,244
Relax... you have found a reliable extension builder in SN6. Highworth Felt Roofing Limited is a friendly and reliable company based in SN6 who con...

Underpinning ranges from £16,956 (Watts Builders based in SN25) to £17,788 (Austen Dawson (UK) Ltd based in SN6), 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 SN6 by posting a job with HaMuch and we will send it to extension builders in SN6.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Stratton St Margaret | £37 | £238 |
| Underpin A Building near Thamesdown | £38 | £239 |
| Underpin A Building near Swindon | £38 | £238 |
| Underpin A Building near Vale of White Horse | £36 | £271 |
| Underpin A Building near Witney | £32 | £244 |
| Underpin A Building near Calne | £29 | £225 |
| Underpin A Building near Abingdon-on-Thames | £35 | £258 |
| Underpin A Building near Didcot | £36 | £266 |
| Underpin A Building near West Wiltshire | £32 | £242 |
| Underpin A Building near North Wiltshire | £32 | £242 |
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 - £17,402

Two storey extension - £87,854

Build a timber frame extension - £25,902

Build a swimming pool - £80,902

Single storey extension - £53,048

Side return extension - £40,402

Install an RSJ - £2,102

Outbuilding - £9,902

Build a Mansard loft conversion - £51,902

Loft conversion - £32,835

Build a kitchen extension - £41,902

Hip to gable loft conversion - £41,902

Granny annexe - £86,902

Garden office - £9,902

Convert a Garage - £15,902

Garage - £18,402

Build a flat roof extension - £21,902

Build a dormer loft conversion - £41,902

Concrete foundations - £6,152

Convert a bungalow loft - £28,902

Convert a basement - £36,402