Luke Rees
General Building Services (Southampton) Ltd is a trusted extension builder serving customers in SP1 and the surrounding area. Contact us to today t...
Experienced extension builder ready to quote for your work. CSY Construction Ltd is the best extension builder in SP1. No obligation free quotes an...
Bailey Construction Services are here to help customers who need an Extension Builder in SP1. We offer a competitive rate to complete all your exte...
Experienced extension builder ready to quote for your work. Grant Construction is the best extension builder in SP1. No obligation free quotes and ...
Need an Extension Builder in SP1? T & S Construction has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
Trowel On is an established extension buildering business in SP1. We come highly recommended and provide competitive quotes for your work.
Relax... you have found a reliable extension builder in SP1. Bob Shearer Property Maintenance, Building & Roofing is a friendly and reliable compan...
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...
Benjamin Belsey
Arkson builders ltd is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and competi...
Kevin Sainsbury
K E Sainsbury Builders is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and comp...

Building a granny annexe ranges from £86,856 (Trowel On based in SO40) to £87,184 (Novare Plumbing Ltd 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 SP1 by posting a job with HaMuch. We will send it to extension builders in SP1 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Salisbury | £35 | £247 |
| Granny Annexe near Test Valley | £37 | £261 |
| Granny Annexe near Romsey | £32 | £230 |
| Granny Annexe near New Forest | £32 | £245 |
| Granny Annexe near Andover | £40 | £248 |
| Granny Annexe near Totton | £34 | £243 |
| Granny Annexe near Chandler's Ford | £34 | £245 |
| Granny Annexe near Eastleigh | £34 | £244 |
| Granny Annexe near Devizes | £32 | £242 |
| Granny Annexe near Southampton | £34 | £243 |
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 - £17,540

Two storey extension - £88,060

Build a timber frame extension - £26,040

Build a swimming pool - £81,040

Single storey extension - £55,800

Side return extension - £41,950

Install an RSJ - £2,240

Outbuilding - £10,040

Build a Mansard loft conversion - £52,040

Loft conversion - £34,125

Build a kitchen extension - £42,040

Hip to gable loft conversion - £42,040

Granny annexe - £87,040

Garden office - £10,040

Convert a Garage - £16,040

Garage - £18,540

Build a flat roof extension - £22,040

Build a dormer loft conversion - £42,040

Concrete foundations - £6,290

Convert a bungalow loft - £29,040

Convert a basement - £37,950