VCONST07640 | Reduced-rating the renovation or alteration of empty residential premises: qualifying services: works to garages
From HM Revenue & Customs · VAT Construction
The following works to garages can be reduced-rated:
the renovation of a garage
the construction of a garage
or
the conversion of a building into a garage
provided the work is:
carried out at the same time as the renovation or alteration of the premises concerned
the garage is intended to be occupied with the renovated or altered premises.