From £88,096
We are a Small Family run business with over 30 years experience in the building trade, Carpentry is my main trade, with NVQ Level 2.
From £87,144
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £86,768
TP Developments are here to help customers who need an Extension Builder in SO15. We offer a competitive rate to complete all your extension builde...
From £87,224
Elmer Building Services ltd is an established extension buildering business in SO15. We come highly recommended and provide competitive quotes for ...
From £87,144
Bailey Construction Services are here to help customers who need an Extension Builder in SO15. We offer a competitive rate to complete all your ext...
From £86,752
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,120
Need to find an Extension Builder near you for all your extension buildering work?
Mobile Services provides a local, trusted extension buil...
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 £87,136
Claytons Building and Roofing are here to help customers who need an Extension Builder in SO15. We offer a competitive rate to complete all your ex...
From £86,960
ROB DINE CONSTRUCTION is an established and experienced local extension builder in SO15. Please contact us for a free, no obligation quote and comp...

Building a granny annexe ranges from £86,752 (Steve Lovett Builders based in SO18) to £88,096 (R&B Property Improvements based in PO9), 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 SO15 by posting a job with HaMuch. We will send it to extension builders in SO15 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Southampton | £34 | £243 |
| Granny Annexe near Totton | £34 | £243 |
| Granny Annexe near Eastleigh | £34 | £244 |
| Granny Annexe near Chandler's Ford | £34 | £245 |
| Granny Annexe near Hedge End | £34 | £244 |
| Granny Annexe near Romsey | £32 | £230 |
| Granny Annexe near Locks Heath | £33 | £240 |
| Granny Annexe near New Forest | £32 | £245 |
| Granny Annexe near Fareham | £35 | £250 |
| Granny Annexe near Winchester | £37 | £266 |
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 - £17,654

Two storey extension - £88,230

Build a timber frame extension - £26,154

Build a swimming pool - £81,154

Single storey extension - £58,072

Side return extension - £43,228

Install an RSJ - £2,354

Outbuilding - £10,154

Build a Mansard loft conversion - £52,154

Loft conversion - £35,190

Build a kitchen extension - £42,154

Hip to gable loft conversion - £42,154

Granny annexe - £87,154

Garden office - £10,154

Convert a Garage - £16,154

Garage - £18,654

Build a flat roof extension - £22,154

Build a dormer loft conversion - £42,154

Concrete foundations - £6,404

Convert a bungalow loft - £29,154

Convert a basement - £39,228