B U I L D U P

NZBC D1 Stair Calculator

Calculate risers, treads, pitch and stair configuration from floor-to-floor height and available footprint. Assessed against D1/AS1 Table 6 & Figure 11 for Accessible, Common, Private and Service stair types per BRANZ BU625.

01 / Dimensions

02 / Stair Configuration

│ Straight
└ Quarter Turn
⊓ Half Turn
◿ Winder
⊚ Spiral

03 / Preferences

Reference: NZBC D1/AS1 — Access Routes (Table 6 & Figure 11). BRANZ Bulletin 625 — Stair Design. The old rule of 2R+G = 580–610 mm should not be used (BU625 §3.1.2). 2R+G is shown for reference only — compliance is determined by rise, going and pitch limits per stair type.