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Select an affordable extension builder
Experienced extension builder ready to quote for your work. Grant Construction is the best extension builder in SO51. No obligation free quotes and...
The business offers a full design service for both kitchens and bathrooms.We work with you to make the best use of your space and find prod...
From £86,288
James Golby
All our work carries a life time guarantee , If we did it and you have a problem we want to know about it. Not the bloke in the pub or your next do...
From £87,272
Ibcon Construction is an established and experienced local extension builder in SO51. Please contact us for a free, no obligation quote and competi...
From £86,912
BUY BUILDER LTD is an established extension buildering business in SO51. We come highly recommended and provide competitive quotes for your work.
From £86,960
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,904
Our building services company KT Carpentry & Building Services has been helping customers in Southampton, Winchester, Brockenhurst and Portsmouth b...
From £87,064
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 £86,288 (James Golby Construction based in SO51) to £87,272 (Ibcon Construction based in SO51), 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 SO51 by posting a job with HaMuch. We will send it to extension builders in SO51 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Romsey | £32 | £230 |
| Granny Annexe near Chandler's Ford | £34 | £245 |
| Granny Annexe near Totton | £34 | £243 |
| Granny Annexe near Eastleigh | £34 | £244 |
| Granny Annexe near Southampton | £34 | £243 |
| Granny Annexe near Test Valley | £37 | £261 |
| Granny Annexe near New Forest | £32 | £245 |
| Granny Annexe near Winchester | £39 | £283 |
| Granny Annexe near Hedge End | £34 | £244 |
| Granny Annexe near Locks Heath | £33 | £240 |
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 - £17,453

Two storey extension - £87,930

Build a timber frame extension - £25,953

Build a swimming pool - £80,953

Single storey extension - £54,060

Side return extension - £40,971

Install an RSJ - £2,153

Outbuilding - £9,953

Build a Mansard loft conversion - £51,953

Loft conversion - £33,309

Build a kitchen extension - £41,953

Hip to gable loft conversion - £41,953

Granny annexe - £86,953

Garden office - £9,953

Convert a Garage - £15,953

Garage - £18,453

Build a flat roof extension - £21,953

Build a dormer loft conversion - £41,953

Concrete foundations - £6,203

Convert a bungalow loft - £28,953

Convert a basement - £36,971