Technical Booklet H Stairs Ramps Guarding and Protection from Impact·Page 32·3.9
Stair Dimensions and Specifications
Diagram 3.9 specifies detailed dimensional requirements for stairs including flight limits, rise and going measurements, handrail heights, nosing profiles, and other technical specifications.
Diagram 3.9 Details of stairs: not more than 12 rises in any flight; rise not less than 150 mm and not more than 170 mm; going not less than 250 mm; not less than 300 mm; not less than 900 mm and not more than 1000 mm above pitch line; not less than 900 mm and not more than 1100 mm; 60° minimum; not more than 25 mm overlap; examples of suitable step profiles shown.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet H - Stairs Ramps Guarding and Protection from Impact.pdf