From £87,008
We are a small business priding oueselves on high quality works carried out with care and attention. We use a select few subcontractors to help com...
From £87,536
Our building services company Roofix and Build Ltd have twenty years experience of helping customers in Weymouth and the surrounding area by provid...
From £87,016
Dorset Showhomes Ltd is an established extension buildering business in DT3. We come highly recommended and provide competitive quotes for your wor...
From £87,192
Need to find an Extension Builder near you for all your extension buildering work?
J FLANN BUILDING & MAINTENANCE provides a local, trusted...
From £87,536
Chris Larner building services is a trusted extension builder serving customers in DT3 and the surrounding area. Contact us to today to get a compe...
From £87,048
DM Building & Property Maintenance is a trusted extension builder serving customers in DT3 and the surrounding area. Contact us to today to get a c...
From £87,360
BUILDCRAFT CONSTRUCTION LTD is an established and experienced local extension builder in DT3. Please contact us for a free, no obligation quote and...
From £86,472
WEYMOUTH ROOFING CO. is an established and experienced local extension builder in DT3. Please contact us for a free, no obligation quote and compet...
From £87,032
Design Properties & Renovations is an established and experienced local extension builder in DT3. Please contact us for a free, no obligation quote...
From £87,144
Weymouth based property Investment and Re-development: Upcycling discarded materials to provide bespoke interior refurbishments, full property reno...

Building a granny annexe ranges from £86,472 (WEYMOUTH ROOFING CO. based in DT4) to £87,536 (Roofix and Build Ltd based in DT4), 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 DT3 by posting a job with HaMuch. We will send it to extension builders in DT3 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Weymouth | £28 | £221 |
| Granny Annexe near Dorchester | £26 | £201 |
| Granny Annexe near Poole | £33 | £215 |
| Granny Annexe near Yeovil | £28 | £242 |
| Granny Annexe near Bournemouth | £33 | £221 |
| Granny Annexe near South Somerset | £48 | £208 |
| Granny Annexe near Taunton | £27 | £208 |
| Granny Annexe near Salisbury | £30 | £211 |
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 - £17,634

Two storey extension - £88,202

Build a timber frame extension - £26,134

Build a swimming pool - £81,134

Single storey extension - £57,688

Side return extension - £43,012

Install an RSJ - £2,334

Outbuilding - £10,134

Build a Mansard loft conversion - £52,134

Loft conversion - £35,010

Build a kitchen extension - £42,134

Hip to gable loft conversion - £42,134

Granny annexe - £87,134

Garden office - £10,134

Convert a Garage - £16,134

Garage - £18,634

Build a flat roof extension - £22,134

Build a dormer loft conversion - £42,134

Concrete foundations - £6,384

Convert a bungalow loft - £29,134

Convert a basement - £39,012