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Experienced extension builder ready to quote for your work. NA Brickwork is the best extension builder in Dartford. No obligation free quotes and m...
Need to find an Extension Builder near you for all your extension buildering work?
Master Builders provides a local, trusted extension buil...
Relax... you have found a reliable extension builder in Dartford. UNIVERSAL CONSTRUCTION is a friendly and reliable company based in Dartford who c...
Curtis Archer
Relax... you have found a reliable extension builder in Dartford. POVERSET BUILDING COMPANY is a friendly and reliable company based in Dartford wh...
Need an Extension Builder in Dartford? Tony Rutter has been helping local clients (10 mile radius) with their extension buildering jobs for many ye...
Relax... you have found a reliable extension builder in Dartford. Sevcan Construction is a friendly and reliable company based in Dartford who cons...
Kunshi Services UK Ltd is a trusted extension builder serving customers in Dartford and the surrounding area. Contact us to today to get a competit...
R Tredget & Son are here to help customers who need an Extension Builder in Dartford. We offer a competitive rate to complete all your extension bu...
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...
Need an Extension Builder in Dartford? MONOLITH CONSTRUCTION LTD has been helping local clients (10 mile radius) with their extension buildering jo...

Outbuilding costs in Dartford range from the cheapest of £9,968 (UNIVERSAL CONSTRUCTION based in BR8) to the dearest of £10,616 (HOUSE BUILDING SERVICES LIMITED based in DA16), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in Dartford by posting a job with HaMuch and we will send it to extension builders.
"Outbuilding" - SIDCUP, job posted 11/12/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Dartford | £41 | £265 |
| Outbuilding near Bexley | £42 | £265 |
| Outbuilding near South Ockendon | £42 | £264 |
| Outbuilding near Grays | £41 | £261 |
| Outbuilding near Northfleet | £41 | £261 |
| Outbuilding near Chafford Hundred | £41 | £261 |
| Outbuilding near Thurrock | £41 | £260 |
| Outbuilding near Gravesend | £40 | £260 |
| Outbuilding near Barking | £43 | £261 |
| Outbuilding near Bromley | £43 | £268 |
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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200