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From £87,240
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Building a granny annexe ranges from £87,240 (DAVID WEBB BUILDING CONT LTD based in DT11) to £87,240 (DAVID WEBB BUILDING CONT LTD based in DT11), 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 DT11 by posting a job with HaMuch. We will send it to extension builders in DT11 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Poole | £38 | £250 |
| Granny Annexe near Dorchester | £30 | £230 |
| Granny Annexe near Bournemouth | £38 | £257 |
| Granny Annexe near Weymouth | £33 | £260 |
| Granny Annexe near Christchurch | £36 | £251 |
| Granny Annexe near Yeovil | £34 | £294 |
| Granny Annexe near Salisbury | £35 | £247 |
| Granny Annexe near New Forest | £32 | £245 |
| Granny Annexe near South Somerset | £62 | £270 |
| Granny Annexe near Frome | £33 | £263 |
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