What handrail height applies to New Brunswick basement stairs?

In New Brunswick, handrails on basement stairs must be mounted between 865mm and 965mm (34" to 38") above the stair nosing, measured vertically from the leading edge of each tread to the top of the handrail.

This requirement comes from the National Building Code of Canada as adopted by New Brunswick, and it applies to both new construction and renovation work. If you're finishing your basement and adding or relocating stairs, your framing inspection will include a check of handrail height and graspability — so getting this right before closing walls saves you a costly fix later.

Graspability matters as much as height. The NBC requires handrails to have a graspable profile — meaning a person must be able to wrap their hand around it. Round profiles between 30mm and 43mm diameter meet this requirement. Flat 2x4 lumber nailed to the wall does not qualify as a graspable handrail, which is a common mistake in older NB homes and DIY basement stair projects. If your basement has one of those flat lumber "rails," it's worth upgrading when you renovate.

When a handrail is required is also worth knowing. Any stairway with more than two risers requires a handrail on at least one side. Most basement stairs easily exceed this threshold. If your stair width is 1,100mm (about 43") or wider, handrails are required on both sides.

A few NB-specific things to keep in mind. Older homes — especially those built in the 1960s through 1980s, which make up a large portion of the housing stock in Moncton, Saint John, and Fredericton — often have basement stairs that were never built to code. When you pull a building permit for basement finishing (which is required when finishing previously unfinished space), the inspector will look at the stairs. It's far better to address handrail height, tread depth, and riser height proactively than to have it flagged at final inspection.

Practical tips:

• Measure from the stair nosing (the front edge of the tread), not the tread surface flat — this is where homeowners most often miscalculate


• Use a round or oval profile handrail bracket system, not flat lumber


• If your stairs are open on one side (no wall), you'll need a guardrail system as well — minimum 900mm height for residential


• Confirm your local municipality's inspection process: Moncton, Saint John, and Fredericton have their own building departments, while rural areas go through Regional Service Commissions with slightly longer timelines

The stair and handrail work itself is within reach for a skilled DIYer, but if you're modifying the stair structure itself — changing riser height, tread depth, or stair location — that touches framing and potentially load-bearing elements, which warrants a professional. If you're planning a full basement finish, New Brunswick Basements can match you with a local contractor who'll handle the whole project to code, including stairs.