From £87,160
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,104
Need an Extension Builder in BN42? Warrior Brickwork has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
From £86,960
Trusted and professional extension builder in BN42. Experienced in all extension buildering work and keeping within budget and on quote. BRICKTEC B...
From £86,984
Need to find an Extension Builder near you for all your extension buildering work?
FIRST FORMAT BUILDING provides a local, trusted extensio...
From £86,760
Woodhart Group is an established extension buildering business in BN42. We come highly recommended and provide competitive quotes for your work.
From £86,912
K. BRAND BUILDING LIMITED are here to help customers who need an Extension Builder in BN42. We offer a competitive rate to complete all your extens...
From £86,728
East building projects is an established extension buildering business in BN42. We come highly recommended and provide competitive quotes for your ...
From £87,296
Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...
From £86,880
KEN BUILDING is an established extension buildering business in BN42. We come highly recommended and provide competitive quotes for your work.
...From £86,904
Fenice Design + Build is an established and experienced local extension builder in BN42. Please contact us for a free, no obligation quote and comp...

Building a granny annexe ranges from £86,728 (East building projects based in bn3) to £87,296 (Proper Copper Design 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 BN42 by posting a job with HaMuch. We will send it to extension builders in BN42 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Shoreham-by-Sea | £36 | £250 |
| Granny Annexe near Lancing | £37 | £251 |
| Granny Annexe near Brighton | £35 | £251 |
| Granny Annexe near Brighton and Hove | £35 | £251 |
| Granny Annexe near Worthing | £35 | £251 |
| Granny Annexe near Burgess Hill | £36 | £240 |
| Granny Annexe near Rustington | £36 | £246 |
| Granny Annexe near Haywards Heath | £35 | £256 |
| Granny Annexe near Littlehampton | £35 | £244 |
| Granny Annexe near Mid Sussex | £35 | £261 |
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 - £17,469

Two storey extension - £87,953

Build a timber frame extension - £25,969

Build a swimming pool - £80,969

Single storey extension - £54,376

Side return extension - £41,149

Install an RSJ - £2,169

Outbuilding - £9,969

Build a Mansard loft conversion - £51,969

Loft conversion - £33,458

Build a kitchen extension - £41,969

Hip to gable loft conversion - £41,969

Granny annexe - £86,969

Garden office - £9,969

Convert a Garage - £15,969

Garage - £18,469

Build a flat roof extension - £21,969

Build a dormer loft conversion - £41,969

Concrete foundations - £6,219

Convert a bungalow loft - £28,969

Convert a basement - £37,149