Mariusz Mika
MBuilding are here to help customers who need an Extension Builder in PO21. We offer a competitive rate to complete all your extension buildering j...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
K A Griffin General Builder is an established extension buildering business in PO21. We come highly recommended and provide competitive quotes for ...
Trusted and professional extension builder in PO21. Experienced in all extension buildering work and keeping within budget and on quote. Paul Ramse...
Paul Stevens is a trusted extension builder serving customers in PO21 and the surrounding area. Contact us to today to get a competitive quote for ...
From £86,712
E C Builders Ltd is an established extension buildering business in PO21. We come highly recommended and provide competitive quotes for your work.<...
From £87,160
Mr R Peterson is a trusted extension builder serving customers in PO21 and the surrounding area. Contact us to today to get a competitive quote for...
From £86,776
Trusted and professional extension builder in PO21. Experienced in all extension buildering work and keeping within budget and on quote. Tim Open h...
From £87,104
we are a craftsmen led carpenty and construction business delivering domestic renovations, extensions, kitchens, bathrooms and finely crafted bespo...

Building a granny annexe ranges from £86,712 (E C Builders Ltd based in PO21) to £87,224 (Paul Stevens based in PO22), 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 PO21 by posting a job with HaMuch. We will send it to extension builders in PO21 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Bognor Regis | £35 | £247 |
| Granny Annexe near Chichester | £34 | £242 |
| Granny Annexe near Arun | £35 | £241 |
| Granny Annexe near Littlehampton | £35 | £241 |
| Granny Annexe near Rustington | £35 | £242 |
| Granny Annexe near Havant & Waterloo | £35 | £248 |
| Granny Annexe near Havant | £35 | £249 |
| Granny Annexe near Worthing | £35 | £249 |
| Granny Annexe near Waterlooville | £36 | £250 |
| Granny Annexe near Horndean | £36 | £254 |
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 - £17,459

Two storey extension - £87,939

Build a timber frame extension - £25,959

Build a swimming pool - £80,959

Single storey extension - £54,184

Side return extension - £41,041

Install an RSJ - £2,159

Outbuilding - £9,959

Build a Mansard loft conversion - £51,959

Loft conversion - £33,368

Build a kitchen extension - £41,959

Hip to gable loft conversion - £41,959

Granny annexe - £86,959

Garden office - £9,959

Convert a Garage - £15,959

Garage - £18,459

Build a flat roof extension - £21,959

Build a dormer loft conversion - £41,959

Concrete foundations - £6,209

Convert a bungalow loft - £28,959

Convert a basement - £37,041