The Ontario Building Code requires handrails to be mounted 865–965 mm above the stair nosing line (OBC Part 9, Section 9.8.7). Measured vertically from the tip of the tread nosing to the top of the handrail. Applies to all interior residential stairs with 3 or more risers.
Staircase Handrail Height Requirements Ontario: Complete 2026 OBC Guide
Handrail height is one of the most frequently misunderstood Ontario Building Code (OBC) requirements in staircase design. Homeowners and contractors alike often confuse the handrail height requirement with the guard height requirement â they are different measurements, measured differently, and apply to different parts of the staircase.
This guide provides a complete breakdown of OBC handrail height requirements for Ontario residential staircases as of 2026, including how to measure correctly and the common errors that fail building inspections.
OBC Handrail Height Requirements Ontario â The Exact Numbers
Under OBC Part 9 (Section 9.88.3 for stairs and Section 9.88.7 for handrails), the required handrail height for residential staircases is:
| Location | Minimum Height | Maximum Height | Measured From |
|---|---|---|---|
| Stairwell handrail | 865mm | 965mm | Leading edge of tread nosing line |
| Landing handrail | 865mm | 965mm | Finished floor surface |
| Guard at landings / top of stairs | 1,070mm | No maximum | Finished floor surface |
| Guard along stairs | 900mm | No maximum | Leading edge of tread nosing line |
The most important thing to understand: the 865â965mm handrail height applies to the graspable rail â the handrail you actually hold when using the stairs. It does NOT apply to the guard (balustrade) height measured from the floor. Those are two different measurements.
How to Measure Handrail Height Per OBC
The OBC requires handrail height to be measured vertically from the leading edge of the stair tread nosing (the front edge of the step) nependicular up to the top of the handrail grasping surface (not the top edge of a wide rail, but the top of the graspable profile).
- Run a tape measure vertically from the leading edge of the tread nosing (front edge of the step) upward
- The measurement ends at the top of the graspable handrail surface
- On open-stringer staircases, measure from the nosing line â an imaginary line connecting the nosing of each tread
- The rail must be between 865mm and 965mm at all points along the stairs
- At landings, measure from the finished floor surface instead
Graspability Requirements for Ontario Staircase Handrails
OBC Part 9 requires that staircase handrails be graspable â a hand must be able to wrap around the handrail and maintain contact throughout the stairwell. This is an active safety requirement, not just a dimensional one.
OBC-compliant handrail profiles:
- Round handrails: A 32â51mm outside diameter is considered inherently graspable and is the most common choice
- Flat-top rails: A.
- Flat-top rails: A maximum surface width of 50mm is permitted if the profile has rounded edges with a minimum 6mm radius â allowing finger grip on either side
- Wood cap rails: a broad wood top rail is permitted when a separate graspable sub-rail is mounted beneath it at the correct height
- Glass top-rail: a frameless glass railing must include a graspable rail on top of the glass panels â a generally flat or very shallow glass edge does not meet the graspability requirement
Height of Handrail from Stair — Why Homeowners Get This Wrong
The most common installation error C.O.R.S sees during renovation assessments: the handrail is installed by measuring from the side of the stringer, not the nosing line of the treads. Open-stringer staircases may strike you as unambiguous, but the measurement point is always the front edge of each tread nosing — the nosing line â not the top of the stringer or the floor.
A second common error: measuring to the top of a broad wood cap rail, rather than to the graspable sub-rail beneath it. A 120mm-wide wood cap rail at ‘handrail height’ does not meet the OBC graspability requirement, even if its top is at 905mm. The graspable sub-rail must be within the 865â965mm range.
Handrail Height Requirements for Ontario Staircase Types
Handrail height requirements apply equally to all residential staircase types in Ontario. Here is how they apply to common designs:
| Staircase Type | Handrail Height (OBC) | Caption |
|---|---|---|
| Floating stairs (mono-stringer) | 865â965mm on both sides | Handrail required on BOTH sides when width exceeds 1100mm |
| Straight run with stringer | 865â965mm | Measured from nosing line on both sides |
| L-shaped / quarter-turn stairs with landing | 865â965mm on stairs / 865â965mm on landing | Landing handrail measured from finished floor |
| Spiral stairs | 865â965mm | Measured from nosing line; spiral geometry complicates installation |
| Winder stairs | 865â965mm | Measured at the narrowst point of each winder tread |
Continuity Requirements — When Handrails Must Run the Full Length
OBC Part 9 requires handrails to run the full length of the stairwell on at least one side. Requirements:
- Handrail must be continuous from the first riser to the last riser
- Extensions of 300mm at top and bottom of stairwell are required by inspectors in some municipalities
- Handrail must not obstruct the stairwell width below the required 860mm minimum
- Handrail brackets must not interfere with graspability at any point along the run
Handrail Height Ontario — Frequently Asked Questions
What is the required height of a handrail from stairs in Ontario?
OBC Part 9 requires staircase handrails in Ontario residential buildings to be between 865mm and 965mm high, measured vertically from the leading edge of the stair tread nosing to the top of the graspable handrail surface.
Is there a difference between handrail and guardrail height?
Yes â this is a critical distinction. The handrail height is 865â965mm measured from the stair tread nosing — this requirement applies to the graspable rail you hold when climbing or descending stairs. The guard height is a separate measurement: 900mm minimum along stairs, 1,070mm at landings and the top of the stairwell. A single railing system may need to satisfy both requirements simultaneously.
Can the top of a glass panel serve as the handrail?
No â a glass panel edge does not meet the OBC graspability requirement. Frameless glass railing systems in Ontario must include a separate graspable rail mounted on top of the glass panels at the OBC-required height.
Handrail height requirements OBC — does the rule change in an unpermitted staircase?
No â the OBC handrail height requirement applies regardless of whether the staircase was built with a permit. When a building inspector visits for any non-related work, an out-of-code handrail can trigger a compliance order. C.O.R.S can assess your existing staircase and provide a compliance paper trail for renovations and resales.
What is the maximum handrail height in Ontario?
965mm is the OBC Maximum. A handrail installed higher than 965mm above the stair tread nosing fails the handrail height requirement just as much as one installed too low. Typical installation is 900mm â the midpoint â which is both easy to memorize and falls safely within the required range.
OBC handrail height — must a handrail run both sides of the staircase?
For most residential staircases in Ontario, a handrail is required on at least one side. A handrail is required on both sides when the staircase width exceeds 1100mm. For floating staircases with no wall, handrails must be provided on both open sides if the staircase exceeds 1100mm width, and on any open side whether or not the staircase is narrower than 1100mm.