From £87,064
JG Brickwork Services Limited is an established extension buildering business in RH15. We come highly recommended and provide competitive quotes fo...
From £86,736
Relax... you have found a reliable extension builder in RH15. Atlas Installations is a friendly and reliable company based in RH15 who consider no ...
From £86,848
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,784
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £87,600
Rjscarpentryconstruction is a well established company with over 30 years of experience in the carpentry and construction industries
From £87,160
Trusted and professional extension builder in RH15. Experienced in all extension buildering work and keeping within budget and on quote. W&S BUILDI...
From £87,360
TOLLEY CARPENTRY is an established extension buildering business in RH15. We come highly recommended and provide competitive quotes for your work.<...
From £87,112
Experienced extension builder ready to quote for your work. MRA CONSTRUCTION is the best extension builder in RH15. No obligation free quotes and m...
From £85,016
Ferguson Building Services Limited is an established and experienced local extension builder in RH15. Please contact us for a free, no obligation q...
From £86,936
Extensions, Refurbishments & Loft ConversionsAt Keystone our mission is to help our clients imagine, design & build environments that enhance their...

Building a granny annexe ranges from £85,016 (Ferguson Building Services Limited based in BN6) to £87,600 (RJ's Carpentry Construction based in RH15), 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 RH15 by posting a job with HaMuch. We will send it to extension builders in RH15 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Burgess Hill | £36 | £240 |
| Granny Annexe near Haywards Heath | £35 | £256 |
| Granny Annexe near Mid Sussex | £35 | £261 |
| Granny Annexe near Brighton and Hove | £35 | £251 |
| Granny Annexe near Brighton | £35 | £251 |
| Granny Annexe near Shoreham-by-Sea | £36 | £250 |
| Granny Annexe near Horsham | £38 | £265 |
| Granny Annexe near Crawley | £38 | £255 |
| Granny Annexe near Lancing | £37 | £251 |
| Granny Annexe near East Grinstead | £37 | £259 |
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 - £17,362

Two storey extension - £87,792

Build a timber frame extension - £25,862

Build a swimming pool - £80,862

Single storey extension - £52,232

Side return extension - £39,943

Install an RSJ - £2,062

Outbuilding - £9,862

Build a Mansard loft conversion - £51,862

Loft conversion - £32,453

Build a kitchen extension - £41,862

Hip to gable loft conversion - £41,862

Granny annexe - £86,862

Garden office - £9,862

Convert a Garage - £15,862

Garage - £18,362

Build a flat roof extension - £21,862

Build a dormer loft conversion - £41,862

Concrete foundations - £6,112

Convert a bungalow loft - £28,862

Convert a basement - £35,943