Relax... you have found a reliable extension builder in Dartford. Sevcan Construction is a friendly and reliable company based in Dartford who cons...
Need an Extension Builder in Dartford? MONOLITH CONSTRUCTION LTD has been helping local clients (10 mile radius) with their extension buildering jo...
Need an Extension Builder in Dartford? Tony Rutter has been helping local clients (10 mile radius) with their extension buildering jobs for many ye...
Buildem Ltd is a trusted extension builder serving customers in Dartford and the surrounding area. Contact us to today to get a competitive quote f...
Tommy House
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in Dartford and the surrounding area. Contact us to today to get a...
Moss Roofing & Sons is an established and experienced local extension builder in Dartford. Please contact us for a free, no obligation quote and co...
Chris Rogers
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Masonic Plumbing and Heating Ltd are here to help customers who need an Extension Builder in Dartford. We offer a competitive rate to complete all ...
Joe
FLEX CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in Dartford. We offer a competitive rate to complete all your ex...
The England Team is an established extension buildering business in Dartford. We come highly recommended and provide competitive quotes for your wo...

Underpinning ranges from £17,420 (Masonic Plumbing and Heating Ltd based in BR2) to £18,116 (HOUSE BUILDING SERVICES LIMITED based in DA16), 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 Dartford by posting a job with HaMuch and we will send it to extension builders in Dartford.
"Underpinning" - BEXLEY, job posted 03/10/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Dartford | £51 | £273 |
| Underpin A Building near Bexley | £42 | £265 |
| Underpin A Building near South Ockendon | £58 | £276 |
| Underpin A Building near Grays | £41 | £261 |
| Underpin A Building near Northfleet | £41 | £261 |
| Underpin A Building near Chafford Hundred | £41 | £261 |
| Underpin A Building near Thurrock | £41 | £260 |
| Underpin A Building near Gravesend | £40 | £260 |
| Underpin A Building near Barking | £43 | £261 |
| Underpin A Building near Bromley | £42 | £265 |
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 - £17,736

Two storey extension - £88,354

Build a timber frame extension - £26,236

Build a swimming pool - £81,236

Single storey extension - £59,720

Side return extension - £44,155

Install an RSJ - £2,436

Outbuilding - £10,236

Build a Mansard loft conversion - £52,236

Loft conversion - £35,963

Build a kitchen extension - £42,236

Hip to gable loft conversion - £42,236

Granny annexe - £87,236

Garden office - £10,236

Convert a Garage - £16,236

Garage - £18,736

Build a flat roof extension - £22,236

Build a dormer loft conversion - £42,236

Concrete foundations - £6,486

Convert a bungalow loft - £29,236

Convert a basement - £40,155