VCONST06200 | Reduced-rating the conversion of premises to a different residential use: what ‘a qualifying conversion’ means
From HM Revenue & Customs · VAT Construction
A conversion is a qualifying conversion when it is:
a changed number of dwellings conversion (VCONST06250)
a house in multiple occupation conversion (VCONST06300)
or
a special residential conversion (VCONST06350)
it includes
any garage works related to the conversion (VCONST06400)
and
statutory planning consent or building control approval needed for the conversion has been granted (VCONST06450).