From £87,008
Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in PO12 and the surrounding areas. ...
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 £86,752
Park Building Services Ltd is a trusted extension builder serving customers in PO12 and the surrounding area. Contact us to today to get a competit...
From £87,128
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,056
K A Griffin General Builder is an established extension buildering business in PO12. We come highly recommended and provide competitive quotes for ...
From £87,224
Paul Stevens is a trusted extension builder serving customers in PO12 and the surrounding area. Contact us to today to get a competitive quote for ...
From £86,776
Been in the building trade for over 30years .have in that time worked all over the country on many different projects.
Have city &...
From £86,768
TP Developments are here to help customers who need an Extension Builder in PO12. We offer a competitive rate to complete all your extension builde...
From £87,144
Bailey Construction Services are here to help customers who need an Extension Builder in PO12. We offer a competitive rate to complete all your ext...

Building a granny annexe ranges from £86,752 (Park Building Services Ltd based in PO9) 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 PO12 by posting a job with HaMuch. We will send it to extension builders in PO12 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Gosport | £35 | £246 |
| Granny Annexe near Lee-on-the-Solent | £35 | £249 |
| Granny Annexe near Portsmouth | £36 | £250 |
| Granny Annexe near Fareham | £35 | £250 |
| Granny Annexe near Ryde | £34 | £255 |
| Granny Annexe near Havant & Waterloo | £35 | £248 |
| Granny Annexe near Waterlooville | £36 | £250 |
| Granny Annexe near Havant | £35 | £249 |
| Granny Annexe near Locks Heath | £33 | £240 |
| Granny Annexe near Horndean | £35 | £253 |
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 - £17,610

Two storey extension - £88,164

Build a timber frame extension - £26,110

Build a swimming pool - £81,110

Single storey extension - £57,192

Side return extension - £42,733

Install an RSJ - £2,310

Outbuilding - £10,110

Build a Mansard loft conversion - £52,110

Loft conversion - £34,778

Build a kitchen extension - £42,110

Hip to gable loft conversion - £42,110

Granny annexe - £87,110

Garden office - £10,110

Convert a Garage - £16,110

Garage - £18,610

Build a flat roof extension - £22,110

Build a dormer loft conversion - £42,110

Concrete foundations - £6,360

Convert a bungalow loft - £29,110

Convert a basement - £38,733