VCONST06400 | Reduced-rating the conversion of premises to a different residential use: garages
From HM Revenue & Customs · VAT Construction
A qualifying conversion includes the construction, or conversion, of a non-residential building (or part of a non-residential building) to a garage, provided:
the work is carried out at the same time as one of the qualifying conversions described in VCONST06250, VCONST06300 or VCONST06350
the garage is intended for use with the dwelling or premises intended for use for a relevant residential purpose.
VCONST06540 provides guidance on parking spaces and driveways.