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Trusted and professional extension builder in Seaham. Experienced in all extension buildering work and keeping within budget and on quote. DHB Buil...
LJP Roofing are here to help customers who need an Extension Builder in Seaham. We offer a competitive rate to complete all your extension builderi...
RAINTON CONSTRUCTION LTD is an established and experienced local extension builder in Seaham. Please contact us for a free, no obligation quote and...
Building Craft Ltd is an established extension buildering business in Seaham. We come highly recommended and provide competitive quotes for your wo...
Ian
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
David Robertson
Trusted and professional extension builder in Seaham. Experienced in all extension buildering work and keeping within budget and on quote. David R...
STEVE MULVANEY BUILDING are here to help customers who need an Extension Builder in Seaham. We offer a competitive rate to complete all your extens...
From £21,912
Our building services company Home Grown NE has been providing professional, trustworthy building services to customers throughout the North-East f...

A flat roof extension ranges from the cheapest of £21,808 (DHB Builders based in DH6) to the dearest of £24,992 (David Robertson builders based in Sr4), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Seaham by posting a job with HaMuch. We'll send it to extension builders in Seaham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Seaham | £35 | £235 |
| Build A Flat Roof Extension near Peterlee | £36 | £230 |
| Build A Flat Roof Extension near Sunderland | £33 | £251 |
| Build A Flat Roof Extension near Washington | £33 | £254 |
| Build A Flat Roof Extension near Durham | £47 | £267 |
| Build A Flat Roof Extension near Chester-le-Street | £35 | £242 |
| Build A Flat Roof Extension near South Tyneside | £34 | £261 |
| Build A Flat Roof Extension near Jarrow | £34 | £262 |
| Build A Flat Roof Extension near Hartlepool | £40 | £236 |
| Build A Flat Roof Extension near South Shields | £36 | £257 |
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 - £17,810

Two storey extension - £88,465

Build a timber frame extension - £26,310

Build a swimming pool - £81,310

Single storey extension - £61,200

Side return extension - £44,988

Install an RSJ - £2,510

Outbuilding - £10,310

Build a Mansard loft conversion - £52,310

Loft conversion - £36,656

Build a kitchen extension - £42,310

Hip to gable loft conversion - £42,310

Granny annexe - £87,310

Garden office - £10,310

Convert a Garage - £16,310

Garage - £18,810

Build a flat roof extension - £22,310

Build a dormer loft conversion - £42,310

Concrete foundations - £6,560

Convert a bungalow loft - £29,310

Convert a basement - £40,988