From £17,924
Trusted and professional extension builder in OX18. Experienced in all extension buildering work and keeping within budget and on quote. Millrick C...
From £17,532
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £17,532
Experienced extension builder ready to quote for your work. MILLHOUSE CONSTRUCTION LIMITED is the best extension builder in OX18. No obligation fre...
From £17,212
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,420
Relax... you have found a reliable extension builder in OX18. TG Projects Ltd is a friendly and reliable company based in OX18 who consider no job ...
From £17,492
DH Building Services (Oxford) Ltd are a family-owned building firm based in Witney with over 30 years of experience providing professional, trustwo...
From £17,540
Trusted and professional extension builder in OX18. Experienced in all extension buildering work and keeping within budget and on quote. A & L BUIL...
From £17,412
M S CUSS BUILDING CONTRACTOR is a trusted extension builder serving customers in OX18 and the surrounding area. Contact us to today to get a compet...
From £17,460
APPLEWOOD CONSTRUCTION is a trusted extension builder serving customers in OX18 and the surrounding area. Contact us to today to get a competitive ...
From £17,420
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £17,212 (Reece Berry Building Contractor based in OX28) to £17,924 (Millrick Construction based in OX18), 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 OX18 by posting a job with HaMuch and we will send it to extension builders in OX18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Witney | £32 | £244 |
| Underpin A Building near Vale of White Horse | £36 | £271 |
| Underpin A Building near Stratton St Margaret | £37 | £238 |
| Underpin A Building near Oxford | £37 | £265 |
| Underpin A Building near Abingdon-on-Thames | £35 | £258 |
| Underpin A Building near Thamesdown | £38 | £239 |
| Underpin A Building near Swindon | £38 | £238 |
| Underpin A Building near Didcot | £36 | £266 |
| Underpin A Building near Cherwell | £35 | £249 |
| Underpin A Building near Bicester | £35 | £249 |
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 - £17,494

Two storey extension - £87,992

Build a timber frame extension - £25,994

Build a swimming pool - £80,994

Single storey extension - £54,888

Side return extension - £41,437

Install an RSJ - £2,194

Outbuilding - £9,994

Build a Mansard loft conversion - £51,994

Loft conversion - £33,698

Build a kitchen extension - £41,994

Hip to gable loft conversion - £41,994

Granny annexe - £86,994

Garden office - £9,994

Convert a Garage - £15,994

Garage - £18,494

Build a flat roof extension - £21,994

Build a dormer loft conversion - £41,994

Concrete foundations - £6,244

Convert a bungalow loft - £28,994

Convert a basement - £37,437