Build additional living space on your property in Westerham

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 Westerham?

Granny annexe cost in Westerham - Sort by rates or availability

J&J Building Solutions

From £87,048

(rates verified 18/09/26)

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Westerham. No obligation free q...

1 review

Torrington

From £87,192

(last active 01/10/26)

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO

Ali & Sons Builders

From £87,152

(last active 01/10/26)

I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...

Buci builders ltd

From £88,024

(last active 01/10/26)

Buci builders ltd is a trusted extension builder serving customers in Westerham and the surrounding area. Contact us to today to get a competitive ...

Local Boiler Plumbing & Heating Services

From £87,312

(last active 30/09/26)

Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in Westerham. Please contact us for a free, no o...

Gb construction

From £87,192

(last active 30/09/26)

Gb construction are here to help customers who need an Extension Builder in Westerham. We offer a competitive rate to complete all your extension ...

Banga Decoration

From £88,200

Member since August 2025

Banga decoration. Is Base in south London  for number of year  Banga decoration is a small  company. Wich provide an excellent job to the custom...

CC&D BUILDING LTD

From £87,184

(last active 30/09/26)

Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in Westerham. No obligation free quotes...

First guard Roofing

From £87,184

(last active 29/09/26)

Relax... you have found a reliable extension builder in Westerham. First guard Roofing is a friendly and reliable company based in Westerham who co...

HOUSE BUILDING SERVICES LIMITED

From £87,616

(last active 29/09/26)

HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in Westerham and the surrounding area. Contact us to today to get ...

Granny Annexe Cost in Westerham

Estimates for granny annexe near Westerham

Building a granny annexe ranges from £87,048 (J&J Building Solutions based in SW16) to £88,200 (Banga Decoration based in CR7), 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 Westerham by posting a job with HaMuch. We will send it to extension builders in Westerham 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 Caterham£43£272
Granny Annexe near Sevenoaks£38£234
Granny Annexe near Croydon£43£267
Granny Annexe near Bromley£42£265
Granny Annexe near Redhill£41£269
Granny Annexe near Bexley£42£265
Granny Annexe near Reigate & Banstead£41£271
Granny Annexe near Sutton£43£273
Granny Annexe near Lewisham£43£268
Granny Annexe near Reigate£40£270

Estimates for common extension builder jobs in Westerham;

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...