Handrails: 34-38 in height, 1¼-2 in graspable, 1½ in wall clearance, continuous for the flight
2025 RCNYS §R320 Handrails — height, projection, grip, continuityDescription
Handrails (required on stairways and ramps) must be 34-38 in tall measured from the sloped tread-nosing line. The handrail must project no more than 4½ in into the stair (6½ in at passing flights). At least 1½ in clearance must separate the handrail from any adjacent wall. The handrail must be CONTINUOUS for the full length of the flight, returning to itself or a wall/guard at the ends. Grip: Type I circular handrails 1¼-2 in outside diameter; non-circular profiles must have a finger recess for graspability.
Why this exists
Handrails save lives in stair falls. The 34-38 in height suits most adult shoulder-to-grip ergonomics; the 1¼-2 in grip lets a small hand close around it. Architects designing stair details should specify Type I round profile unless a specific aesthetic drives Type II — Type II grip sizing is more constrained and costlier.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
minHeight | min | 34 | in | Handrail minimum height |
maxHeight | max | 38 | in | Handrail maximum height |
maxProjection | max | 4.5 | in | Maximum projection into stair |
minWallClearance | min | 1.5 | in | Clearance from adjacent wall |
circularMin | min | 1.25 | in | Circular grip minimum diameter |
circularMax | max | 2 | in | Circular grip maximum diameter |
Categories
Applies to
- Jurisdiction: New York State
Source
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Garage / dwelling fire separation · IRC R302.6
- Habitable space minimum ceiling height · IRC R305.1
- Egress window net opening dimensions · IRC R310.2
- Stair riser, tread, and headroom · IRC R311.7
- Smoke alarms required throughout dwelling · IRC R314
Last reviewed 2026-05-15.