From £17,812
Shape Project Management is an established and experienced local extension builder in Downton. Please contact us for a free, no obligation quote an...
From £17,652
Need an Extension Builder in Downton? Moores Build has been helping local clients (20 mile radius) with their extension buildering jobs for many ye...
From £17,636
Arkson builders ltd is an established and experienced local extension builder in Downton. Please contact us for a free, no obligation quote and com...
From £17,372
Downton, SP5
Need to find an Extension Builder near you for all your extension buildering work?
R F S BUILDERS provides a local, trusted extension build...
From £17,580
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,708
Downton, SP5
STEWART BUILDERS is an established and experienced local extension builder in Downton. Please contact us for a free, no obligation quote and compet...
From £17,644
Need to find an Extension Builder near you for all your extension buildering work?
MILESTONE BUILDING CONTRACTORS provides a local, trusted...
From £16,348
We specialise in Epoxy Resin and Polyurethane floor coatings and screeds (very durable and seamless flooring), designed for retail, factories, manu...
From £17,604
JJ Acquisitions ltd is a trusted extension builder serving customers in Downton and the surrounding area. Contact us to today to get a competitive ...

Underpinning ranges from £16,348 (Floortrak Limited based in SO51) to £17,812 (Shape Project Management based in SP5), 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 Downton by posting a job with HaMuch and we will send it to extension builders in Downton.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Salisbury | £35 | £247 |
| Underpin A Building near New Forest | £32 | £245 |
| Underpin A Building near Romsey | £32 | £230 |
| Underpin A Building near Test Valley | £37 | £261 |
| Underpin A Building near Totton | £34 | £243 |
| Underpin A Building near Chandler's Ford | £34 | £245 |
| Underpin A Building near Eastleigh | £34 | £244 |
| Underpin A Building near Southampton | £34 | £243 |
| Underpin A Building near Andover | £40 | £248 |
| Underpin A Building near Christchurch | £36 | £251 |
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 - £17,417

Two storey extension - £87,875

Build a timber frame extension - £25,917

Build a swimming pool - £80,917

Single storey extension - £53,336

Side return extension - £40,564

Install an RSJ - £2,117

Outbuilding - £9,917

Build a Mansard loft conversion - £51,917

Loft conversion - £32,970

Build a kitchen extension - £41,917

Hip to gable loft conversion - £41,917

Granny annexe - £86,917

Garden office - £9,917

Convert a Garage - £15,917

Garage - £18,417

Build a flat roof extension - £21,917

Build a dormer loft conversion - £41,917

Concrete foundations - £6,167

Convert a bungalow loft - £28,917

Convert a basement - £36,564