From £86,800
Need to find an Extension Builder near you for all your extension buildering work?
DC Roofing & Sons Ltd provides a local, trusted extensio...
From £86,824
Relax... you have found a reliable extension builder in PO3. Bribern Property Services is a friendly and reliable company based in PO3 who consider...
From £86,968
Experienced extension builder ready to quote for your work. Shepperd Developments is the best extension builder in PO3. No obligation free quotes a...
From £86,784
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,088
Experienced extension builder ready to quote for your work. JM Roofing & Building Services is the best extension builder in PO3. No obligation free...
From £87,000
Build Light Group is an established and experienced local extension builder in PO3. Please contact us for a free, no obligation quote and competiti...
From £86,712
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,984
Sigma Probuild Ltd is an established extension buildering business in PO3. We come highly recommended and provide competitive quotes for your work....
From £86,944
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,000
Experienced extension builder ready to quote for your work. Pompey Homes Ltd is the best extension builder in PO3. No obligation free quotes and ma...

Building a granny annexe ranges from £86,712 (Westcott Construction Ltd based in PO3) to £87,088 (JM Roofing & Building Services based in PO2), 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 PO3 by posting a job with HaMuch. We will send it to extension builders in PO3 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Portsmouth | £36 | £250 |
| Granny Annexe near Gosport | £35 | £246 |
| Granny Annexe near Havant & Waterloo | £35 | £248 |
| Granny Annexe near Havant | £35 | £249 |
| Granny Annexe near Waterlooville | £36 | £250 |
| Granny Annexe near Fareham | £35 | £250 |
| Granny Annexe near Lee-on-the-Solent | £35 | £249 |
| Granny Annexe near Horndean | £35 | £253 |
| Granny Annexe near Locks Heath | £33 | £240 |
| Granny Annexe near Chichester | £34 | £242 |
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 - £17,410

Two storey extension - £87,866

Build a timber frame extension - £25,910

Build a swimming pool - £80,910

Single storey extension - £53,208

Side return extension - £40,492

Install an RSJ - £2,110

Outbuilding - £9,910

Build a Mansard loft conversion - £51,910

Loft conversion - £32,910

Build a kitchen extension - £41,910

Hip to gable loft conversion - £41,910

Granny annexe - £86,910

Garden office - £9,910

Convert a Garage - £15,910

Garage - £18,410

Build a flat roof extension - £21,910

Build a dormer loft conversion - £41,910

Concrete foundations - £6,160

Convert a bungalow loft - £28,910

Convert a basement - £36,492