VRDP11300 | Building alterations [items 8 to 13]: construction of ramps and widening of doors or passages in a disabled person's private residence [item 8]
From HM Revenue & Customs · VAT Relief for Disabled People Manual
If the basic preconditions set out at VRDP11200 and VRDP11250 have been met, then the following services can be zero-rated under item 8 (see VRDP11050):
constructing ramps or widening doors or passages;
any preparatory work or the making good of surrounding areas, including: the removal of bricks and mortar;
the installation of a new frame and surround;
the supply and fitting of a wider door;
the re-plastering of the wall adjacent to the new work; or
the restoration of damaged decor.