Stair: 14 risers of 192.3 mm (7 5/8 in) each and 13 treads at 280 mm run, for a total rise of 2692 mm (8 ft 10 in).
Layout: total run 3640 mm (11 ft 11 1/4 in); stringer line along the nosings 4528 mm (14 ft 10 1/4 in); stair angle 34.5 degrees; tread depth 280 to 305 mm; bottom riser cut 167.3 mm to allow for a 25 mm tread.
Code checks: Riser 125 to 200 mm (Table 9.8.4.1.) pass (192.3 mm); Run 255 to 355 mm (Table 9.8.4.1.) pass (280 mm); Flight rise not over 3.7 m (9.8.3.3.) pass (2.69 m); Nosing and tread depth (9.8.4.2.) pass (depth 305 mm).
Other options for the same rise: 14 risers at 192.3 mm, total run 3640 mm; 15 risers at 179.5 mm, total run 3920 mm; 16 risers at 168.3 mm, total run 4200 mm.
Notes: Provide at least 1 950 mm of clear headroom measured above the line of the nosings (at least 860 mm of stair width for a private stair), and equal risers within 5 mm between adjacent steps and 10 mm overall.
Source: Ontario Building Code 2024, Division B, Part 9, Table 9.8.4.1. and Articles 9.8.3.3. and 9.8.4.2.
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Preliminary planning only; the designer or engineer of record and the building permit set govern.