From £17,780
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 £17,812
Relax... you have found a reliable extension builder in Watford. Frame Brickwork is a friendly and reliable company based in Watford who consider n...
From £20,260
Trusted and professional extension builder in Watford. Experienced in all extension buildering work and keeping within budget and on quote. Design ...
From £17,924
Experienced extension builder ready to quote for your work. 1st Choice Builders UK is the best extension builder in Watford. No obligation free quo...
From £17,524
A&T Building is an established extension buildering business in Watford. We come highly recommended and provide competitive quotes for your work.
From £17,724
T N Roofing is an established extension buildering business in Watford. We come highly recommended and provide competitive quotes for your work.
From £17,644
Primrose Projects is an established and experienced local extension builder in Watford. Please contact us for a free, no obligation quote and compe...
From £17,964
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 £17,524
Cannon Build Solutions is an established extension buildering business in Watford. We come highly recommended and provide competitive quotes for yo...
From £17,724
Relax... you have found a reliable extension builder in Watford. C S C BUILDINGS LTD is a friendly and reliable company based in Watford who consid...

Underpinning ranges from £17,524 (A&T Building based in WD18) to £20,260 (Design & Build Builders Ltd based in WD18), 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 Watford by posting a job with HaMuch and we will send it to extension builders in Watford.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Watford | £43 | £278 |
| Underpin A Building near Bushey | £42 | £276 |
| Underpin A Building near Rickmansworth | £42 | £278 |
| Underpin A Building near Borehamwood | £42 | £270 |
| Underpin A Building near Harrow | £43 | £271 |
| Underpin A Building near Hillingdon | £63 | £276 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near St Albans | £63 | £288 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Hemel Hempstead | £42 | £270 |
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 - £17,988

Two storey extension - £88,732

Build a timber frame extension - £26,488

Build a swimming pool - £81,488

Single storey extension - £64,760

Side return extension - £46,990

Install an RSJ - £2,688

Outbuilding - £10,488

Build a Mansard loft conversion - £52,488

Loft conversion - £38,325

Build a kitchen extension - £42,488

Hip to gable loft conversion - £42,488

Granny annexe - £87,488

Garden office - £10,488

Convert a Garage - £16,488

Garage - £18,988

Build a flat roof extension - £22,488

Build a dormer loft conversion - £42,488

Concrete foundations - £6,738

Convert a bungalow loft - £29,488

Convert a basement - £42,990