VRDP11150 | Building alterations [items 8 to 13]: criteria for zero-rating building alterations
From HM Revenue & Customs · VAT Relief for Disabled People Manual
Certain basic preconditions must be met before any supply of building alteration services may be zero-rated. These are:
the supply must be made to an eligible charity or a disabled person; and
for a disabled person the work must be carried out in that person’s private residence.
See VRDP11050.