From £87,296
Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...
From £86,728
East building projects is an established extension buildering business in Bn3 5f. We come highly recommended and provide competitive quotes for you...
From £86,856
CAMBRIDGE BUILDING SERVICES is a trusted extension builder serving customers in Bn3 5f and the surrounding area. Contact us to today to get a compe...
From £86,904
Fenice Design + Build is an established and experienced local extension builder in Bn3 5f. Please contact us for a free, no obligation quote and co...
From £86,880
KEN BUILDING is an established extension buildering business in Bn3 5f. We come highly recommended and provide competitive quotes for your work.
From £87,320
We are truly a 1 stop shop for any internal and external trade works. Using all
of our own guys we offer anything from small repairs to ...
From £87,024
Need to find an Extension Builder near you for all your extension buildering work?
Openshaw Living provides a local, trusted extension buil...
From £86,768
Experienced extension builder ready to quote for your work. Graeme Davies Plumbing and Heating is the best extension builder in Bn3 5f. No obligati...
From £86,704
Experienced extension builder ready to quote for your work. Moon Tree is the best extension builder in Bn3 5f. No obligation free quotes and many h...
From £86,760
Woodhart Group is an established extension buildering business in Bn3 5f. We come highly recommended and provide competitive quotes for your work.<...

Building a granny annexe ranges from £86,704 (Moon Tree based in BN3) to £87,320 (Reactive Property Services Ltd based in BN3), 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 Bn3 5f by posting a job with HaMuch. We will send it to extension builders in Bn3 5f who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Brighton | £30 | £219 |
| Granny Annexe near Brighton and Hove | £30 | £219 |
| Granny Annexe near Shoreham-by-Sea | £31 | £217 |
| Granny Annexe near Lancing | £32 | £219 |
| Granny Annexe near Worthing | £31 | £222 |
| Granny Annexe near Burgess Hill | £31 | £208 |
| Granny Annexe near Haywards Heath | £30 | £222 |
| Granny Annexe near Seaford | £30 | £214 |
| Granny Annexe near Rustington | £32 | £220 |
| Granny Annexe near Mid Sussex | £30 | £224 |
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 - £17,424

Two storey extension - £87,886

Build a timber frame extension - £25,924

Build a swimming pool - £80,924

Single storey extension - £53,480

Side return extension - £40,645

Install an RSJ - £2,124

Outbuilding - £9,924

Build a Mansard loft conversion - £51,924

Loft conversion - £33,038

Build a kitchen extension - £41,924

Hip to gable loft conversion - £41,924

Granny annexe - £86,924

Garden office - £9,924

Convert a Garage - £15,924

Garage - £18,424

Build a flat roof extension - £21,924

Build a dormer loft conversion - £41,924

Concrete foundations - £6,174

Convert a bungalow loft - £28,924

Convert a basement - £36,645