From £86,912
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 £86,160
We provide expert advice on building defects and cost effective environmental friendly solutions throughout the North East of England. Our bu...
From £87,104
A Kendal Builders (N/E) Limited is an established and experienced local extension builder in Seaham. Please contact us for a free, no obligation qu...
From £86,832
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...
From £86,808
Trusted and professional extension builder in Seaham. Experienced in all extension buildering work and keeping within budget and on quote. DHB Buil...
From £86,912
Our building services company Home Grown NE has been providing professional, trustworthy building services to customers throughout the North-East f...
From £86,936
Building Craft Ltd is an established extension buildering business in Seaham. We come highly recommended and provide competitive quotes for your wo...
From £86,984
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £89,992
Trusted and professional extension builder in Seaham. Experienced in all extension buildering work and keeping within budget and on quote. David R...
From £87,104
RAINTON CONSTRUCTION LTD is an established and experienced local extension builder in Seaham. Please contact us for a free, no obligation quote and...

Building a granny annexe ranges from £86,160 (Dry Tec based in DH6) to £89,992 (David Robertson builders based in Sr4), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in Seaham by posting a job with HaMuch. We will send it to extension builders in Seaham who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Seaham | £34 | £229 |
| Granny Annexe near Peterlee | £35 | £222 |
| Granny Annexe near Sunderland | £33 | £251 |
| Granny Annexe near Washington | £33 | £251 |
| Granny Annexe near Durham | £47 | £267 |
| Granny Annexe near Chester-le-Street | £35 | £242 |
| Granny Annexe near South Tyneside | £34 | £261 |
| Granny Annexe near Jarrow | £34 | £261 |
| Granny Annexe near Hartlepool | £40 | £236 |
| Granny Annexe 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 - £17,674

Two storey extension - £88,262

Build a timber frame extension - £26,174

Build a swimming pool - £81,174

Single storey extension - £58,488

Side return extension - £43,462

Install an RSJ - £2,374

Outbuilding - £10,174

Build a Mansard loft conversion - £52,174

Loft conversion - £35,385

Build a kitchen extension - £42,174

Hip to gable loft conversion - £42,174

Granny annexe - £87,174

Garden office - £10,174

Convert a Garage - £16,174

Garage - £18,674

Build a flat roof extension - £22,174

Build a dormer loft conversion - £42,174

Concrete foundations - £6,424

Convert a bungalow loft - £29,174

Convert a basement - £39,462