Technical Booklet H Stairs Ramps Guarding and Protection from Impact·Page 16·2.3
Ramps on access routes to non-domestic buildings
Ramps on access routes to buildings other than dwellings must comply with paragraphs 4.14 to 4.25, and external ramps with crossfall must have a maximum gradient of 1:40.
Ramps on access routes should comply with the provisions given in paragraphs 4.14 to 4.25. See Diagram 2.1. However, where an external ramp has a crossfall, that crossfall should have a maximum gradient of 1:40.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet H - Stairs Ramps Guarding and Protection from Impact.pdf