Does a garden room affect council tax or business rates?

A garden room used as part of everyday domestic life will not normally affect your council tax. However, if you are running a business from home, using the building exclusively as office space or regularly welcoming customers, business rates may apply. If you’re using a garden office room for remote working or occasional work from home days, this is unlikely to change your council tax position, but the Valuation Office Agency can advise where circumstances are less straightforward.