From £86,928
Loki Projects & Development specialises in design, construction & project management.
From £87,080
Experienced extension builder ready to quote for your work. Shay building LTD is the best extension builder in Southampton. No obligation free quot...
From £86,968
Trusted and professional extension builder in Southampton. Experienced in all extension buildering work and keeping within budget and on quote. LG ...
From £86,728
Hestia Trustins LTD are here to help customers who need an Extension Builder in Southampton. We offer a competitive rate to complete all your exten...
From £87,192
We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...
From £86,920
Southampton, SO14
Need to find an Extension Builder near you for all your extension buildering work?
DSH Roofing provides a local, trusted extension builderi...
From £86,904
Need to find an Extension Builder near you for all your extension buildering work?
Dell Developments Ltd provides a local, trusted extensio...
From £86,768
Need to find an Extension Builder near you for all your extension buildering work?
Mark Mckie provides a local, trusted extension builderin...
From £87,144
Southampton, SO15
Bailey Construction Services are here to help customers who need an Extension Builder in Southampton. We offer a competitive rate to complete all y...
From £86,968
Trusted and professional extension builder in Southampton. Experienced in all extension buildering work and keeping within budget and on quote. And...

Building a granny annexe ranges from £86,728 (Hestia Trustins LTD based in SO14) to £87,192 (AAConcepts based in SO14), 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 Southampton by posting a job with HaMuch. We will send it to extension builders in Southampton who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Southampton | £34 | £243 |
| Granny Annexe near Eastleigh | £34 | £244 |
| Granny Annexe near Totton | £34 | £243 |
| Granny Annexe near Hedge End | £34 | £244 |
| Granny Annexe near Chandler's Ford | £34 | £245 |
| Granny Annexe near Locks Heath | £33 | £240 |
| Granny Annexe near Romsey | £32 | £230 |
| Granny Annexe near New Forest | £32 | £245 |
| Granny Annexe near Fareham | £35 | £250 |
| Granny Annexe near Lee-on-the-Solent | £35 | £249 |
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 - £17,460

Two storey extension - £87,940

Build a timber frame extension - £25,960

Build a swimming pool - £80,960

Single storey extension - £54,200

Side return extension - £41,050

Install an RSJ - £2,160

Outbuilding - £9,960

Build a Mansard loft conversion - £51,960

Loft conversion - £33,375

Build a kitchen extension - £41,960

Hip to gable loft conversion - £41,960

Granny annexe - £86,960

Garden office - £9,960

Convert a Garage - £15,960

Garage - £18,460

Build a flat roof extension - £21,960

Build a dormer loft conversion - £41,960

Concrete foundations - £6,210

Convert a bungalow loft - £28,960

Convert a basement - £37,050