From £17,404
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 £17,412
Brentwood, CM13
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £18,044
Brentwood, CM13
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,772
Our building services company Harris Murray Carpentry & Building Ltd has been helping customers in Brentwood, Billericay, and Essex by providing pr...
From £17,820
Brentwood, CM14
Essex Elite Services is a trusted extension builder serving customers in Brentwood and the surrounding area. Contact us to today to get a competiti...
From £17,596
Renov8 Create are here to help customers who need an Extension Builder in Brentwood. We offer a competitive rate to complete all your extension bui...
From £17,572
Brentwood, CM13
PRESTON BUILDERS LTD is a trusted extension builder serving customers in Brentwood and the surrounding area. Contact us to today to get a competiti...
From £17,476
Complete house renovations, extensions build, loft conversions, kitchen and bathrooms renovations, plumbing, electrical, plastering, painting & dec...
From £17,700
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 £17,676
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £17,404 (Line Up Brickwork Ltd based in CM13) to £18,044 (Clive Williams based in CM13), 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 Brentwood by posting a job with HaMuch and we will send it to extension builders in Brentwood.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Brentwood | £39 | £255 |
| Underpin A Building near Billericay | £38 | £248 |
| Underpin A Building near Basildon | £39 | £251 |
| Underpin A Building near Romford | £45 | £275 |
| Underpin A Building near Stanford-le-Hope | £40 | £254 |
| Underpin A Building near South Ockendon | £58 | £276 |
| Underpin A Building near Thurrock | £41 | £260 |
| Underpin A Building near Wickford | £39 | £255 |
| Underpin A Building near Chafford Hundred | £41 | £261 |
| Underpin A Building near Grays | £41 | £261 |
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 - £17,647

Two storey extension - £88,221

Build a timber frame extension - £26,147

Build a swimming pool - £81,147

Single storey extension - £57,944

Side return extension - £43,156

Install an RSJ - £2,347

Outbuilding - £10,147

Build a Mansard loft conversion - £52,147

Loft conversion - £35,130

Build a kitchen extension - £42,147

Hip to gable loft conversion - £42,147

Granny annexe - £87,147

Garden office - £10,147

Convert a Garage - £16,147

Garage - £18,647

Build a flat roof extension - £22,147

Build a dormer loft conversion - £42,147

Concrete foundations - £6,397

Convert a bungalow loft - £29,147

Convert a basement - £39,156