Build additional living space on your property in RH20

A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in RH20?

Granny annexe cost in RH20 - Sort by rates or availability

Main Construction

From £87,440

(last active 01/10/26)

Need to find an Extension Builder near you for all your extension buildering work?

Main Construction provides a local, trusted extension bu...

Whites Carpentry & Building

From £87,008

(last active 01/10/26)

Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in RH20 and the surrounding areas. ...

MPS Home Improvements Ltd

From £86,872

(last active 29/09/26)

Need an Extension Builder in RH20? MPS Home Improvements Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...

H P Building Services Sussex

From £86,992

Member since August 2026

H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...

R S Construction (Surrey)

From £87,168

(last active 22/09/26)

R S Construction (Surrey) is an established extension buildering business in RH20. We come highly recommended and provide competitive quotes for yo...

Shercoriana London Ltd

From £87,032

(last active 22/09/26)

We are a family run business we 40 years experience delivering multiple projects from new developments . Extension. Loft conversion. Including foun...

Futureways Design and Build

From £87,112

(last active 19/09/26)

Futureways Design and Build are here to help customers who need an Extension Builder in RH20. We offer a competitive rate to complete all your exte...

Alan Pacy Builder

From £87,200

(last active 18/09/26)

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

GD Project Management Ltd

From £87,376

(last active 18/09/26)

Giles Dixon is an experienced Project Manager with over 30 years experience, having worked from the ground up starting in 1984 as an apprentice ele...

Regent Property Holdings Ltd

From £87,128

(last active 18/09/26)

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Granny Annexe Cost in RH20

Estimates for granny annexe near RH20

Building a granny annexe ranges from £86,872 (MPS Home Improvements Ltd based in RH14) to £87,440 (Main Construction based in BN12), 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 RH20 by posting a job with HaMuch. We will send it to extension builders in RH20 who will be happy to help you.


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Granny Annexe near Rustington£36£246
Granny Annexe near Littlehampton£35£244
Granny Annexe near Arun£35£241
Granny Annexe near Worthing£35£251
Granny Annexe near Lancing£37£251
Granny Annexe near Horsham£38£265
Granny Annexe near Shoreham-by-Sea£36£250
Granny Annexe near Bognor Regis£35£247
Granny Annexe near Burgess Hill£36£240
Granny Annexe near Chichester£34£242

Estimates for common extension builder jobs in RH20;

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.

More extensions & conversions cost guides...