Free Tool
UK Stair Calculator
Enter your floor-to-floor height and we'll work out a compliant staircase to Building Regulations Approved Document Part K, complete with a sectional drawing.
Results
Risers12Riser height216.7mmGoings11Going depth250.0mmTotal run2750mmPitch40.9°2R + G683mm
This stair complies with Part K geometry rules
Part K Compliance Checks
Riser 216.7mm — allowed 150–220mm
Going 250.0mm — allowed 220–300mm
2 × Rise + Going = 683mm — must be 550–700mm
Pitch 40.9° — max 42°
Headroom: min 2000mm measured vertically above the pitch line
Handrail: 900–1000mm above pitch line; required on at least one side if stair <1m wide, both sides if wider
Guarding: required where drop exceeds 600mm; 100mm sphere must not pass through
Min 50mm gap between any door swing and the bottom step
Guidance tool only. Always confirm your design with Building Control or a qualified professional. Need a full staircase design? Get in touch.