PPS 6 Planning Archaeology and the Built Heritage·Page 65·E34
Ramps and Access for People with Disabilities - Principles
Access for people with disabilities in historic buildings is often essential and may be mandatory. Alterations to listed buildings for this purpose normally require listed building consent.
It is often essential for the continuing use of historic buildings that people have access to them. In many cases provision of access for people with disabilities is mandatory. Alterations to a listed building to provide such access will normally require listed building consent.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 6 - Planning Archaeology and the Built Heritage.pdf