Cost to build a granny annexe in Kent

Granny Annexe Cost in Kent

Building a granny annexe ranges from £87,064 (Hyde Building Ltd based in DA2) to £87,616 (HOUSE BUILDING SERVICES LIMITED based in DA16), 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 Kent by posting a job with HaMuch. We will send it to extension builders in Kent who will be happy to help you.

"Granny annexe" - BEXLEYHEATH, job posted 10/07/25

Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Granny Annexe near Bexley	£42	£265
Granny Annexe near Dartford	£41	£265
Granny Annexe near Bromley	£43	£268
Granny Annexe near Northfleet	£41	£261
Granny Annexe near Sevenoaks	£38	£234
Granny Annexe near Grays	£41	£261
Granny Annexe near South Ockendon	£42	£264
Granny Annexe near Lewisham	£43	£268
Granny Annexe near Gravesend	£40	£260
Granny Annexe near Greenwich	£44	£268

Estimates for common extension builder jobs in Kent;

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.