A bathtub grab bar is installed horizontally along the long wall of the tub, between 180 and 280 mm above the rim, with a second vertical bar at the entry point. The rest comes down to a detail that most people overlook: the wall must be able to withstand a load of 1.3 kN—about 130 kg—without budging.
Key Points
- The National Building Code specifies a bar diameter of 30 to 40 mm and a clearance of 35 to 45 mm between the bar and the wall.
- In a bathtub, two 1,200-mm rails cover the entrance and the path along the tub.
- In a shower, the vertical grab bar must be at least 1,000 mm long, and its lower end must be between 600 and 650 mm above the floor.
- The L-shaped grab bar installed on the side of the shower seat has a horizontal section that is between 750 and 870 mm above the floor.
- A stud wall is reinforced with 38-mm solid wood or an OSB or plywood panel with a nominal thickness of 18 mm.
- Between 20 and 30 percent of falls result in an injury, ranging from cuts to fractures, and hospitalizations due to falls among older adults increased by 38 percent between 1999–2002 and 2011–2016 in Quebec.
Why Does the Bathroom Pose So Many Risks?
A bathroom combines three unfavorable conditions in one place: wet surfaces, unstable footing, and movements that require balance on one leg. Stepping over the edge of a bathtub is the worst of the three, because it combines weight transfer, pelvic rotation, and the lack of a reliable handhold.
The public health report confirms the issue. The Ministry of Health and Social Services reports that 20 to 30% of falls result in injuries ranging from minor to severe, and that the number of hospitalizations due to falls has surged by 38% over the past fifteen years (framework for fall prevention). Another factor that is often overlooked is orthostatic hypotension—that dizziness felt when standing up—which affects up to 30% of people aged 65 and older living at home. This is exactly what happens when you stand up from a shower seat.
A grab bar does not correct balance; it provides a fixed point of support during the two seconds when balance is lost. The Quebec National Institute of Public Health, in fact, classifies home modifications as one component of a comprehensive approach, alongside physical activity and medication review.
In a bathtub, the horizontal bar assists with movement, while the vertical bar provides support when getting in.
Where to Place a Grab Bar in a Bathtub
Two grab bars are better than one, and they serve different purposes. The first is installed vertically above the edge of the tub on the side where you enter; it helps you steady yourself while standing before stepping over the edge. The National Building Code requires a minimum length of 1,200 mm and a lower end located between 180 and 280 mm above the tub.
The second rail is installed horizontally, lengthwise, at the same height—between 180 and 280 mm—above the tub. It guides the user as they move toward the seat and back up. The bottom of the tub must be non-slip, and no rails should obstruct the rim.
A simple rule for determining the right spot in your home: the person using the bar should be able to grasp it without leaning forward or fully extending their arm. If they have to stretch, the bar is in the wrong spot, regardless of its dimensions.
The L-shaped bar on the wall behind the seat allows you to sit down, stand up, and turn around without letting go.
Where to Install a Grab Bar in a Shower
For a shower, the Code specifies two complementary grab bars. A vertical grab bar at least 1,000 mm long must be mounted on the side wall, 50 to 80 mm from the adjacent clear space, with its lower end between 600 and 650 mm above the floor. This is the entry and exit grab bar.
An L-shaped bar is then mounted on the wall opposite the entrance, on the side of the seat. Its horizontal section is at least 1,000 mm long and is located between 750 and 870 mm above the floor; its vertical section is at least 750 mm long. This configuration allows the user to sit down, stand up, and turn while maintaining a continuous grip.
The threshold is just as important as the curb: the Code limits the height of a shower threshold to 13 mm and requires a bevel whenever it exceeds 6 mm. An accessible, threshold-free shower solves the problem at its source, which is why it is so often included in home-accessibility projects.
And near the toilet
The toilet area is secured with a side bar and a back bar. The Code requires a rear grab bar of at least 600 mm centered over the toilet bowl, or two grab bars of at least 300 mm each placed on either side of the flush handle, mounted at the same height as the side grab bar. The toilet paper holder is located between 600 and 800 mm from the floor, 300 mm from the front of the toilet, which prevents unnecessary twisting.
Grab Bars: Dimensions According to the 2025 National Building Code
Bathtub
Shower
Restroom
The size ranges specified in the 2025 National Building Code, used as a design reference for residential buildings.
Height, diameter, clearance: the numbers that never change
Regardless of the type of bathroom fixture, four requirements apply to all grab bars: a slip-resistant surface with no sharp edges, a diameter of 30 to 40 mm, a clearance of 35 to 45 mm from the wall, and the ability to withstand a load of 1.3 kN applied vertically or horizontally. These values are taken from the National Building Code 2025, published by the National Research Council of Canada.
Diameter is not just a cosmetic detail. A bar that is too thick prevents the hand from closing completely, while a bar that is too thin reduces the contact surface. A clearance of 35 to 45 mm, on the other hand, allows the fingers to pass through without the hand getting caught behind the bar.
These requirements apply to buildings covered by the Code, primarily public spaces and certain parts of residential buildings. In a private residence, they are not legally binding, but they serve as the best available design guidelines. The Régie du bâtiment du Québec administers the Building Chapter applicable in the province.
The binding: what really holds the bar in place
A compliant handrail that is not properly anchored remains dangerous. The Code addresses this issue with regard to the wall: when stud walls in a dwelling are reinforced to accommodate handrails—whether existing or future—the reinforcement must enable the handrail to withstand a load of 1.3 kN. Two compliance options are specified: solid wood at least 38 mm thick, or an intermediate layer of OSB or plywood with a nominal thickness of at least 18 mm.
There are three common scenarios in existing bathrooms. When the bar lines up exactly with the studs, fairly long wood screws that go through the drywall and the wall covering are sufficient. When it falls between studs, a continuous support must be added behind the finish, which requires opening up the wall or using a distribution plate designed for this purpose. In a panel or acrylic shower, the support must be installed before the finish is applied; otherwise, the load will be borne by a thin shell.
Tilt-type anchors and self-drilling anchors for drywall are available, but they are not equivalent to an anchor in wood. They have a specific use, under specific conditions, with a load capacity specified by the manufacturer. A suction cup bar, on the other hand, is not a support bar: it serves as a reference point, never as a point of support in the event of a loss of balance.
Tile requires one final precaution. Drill at low speed, without hammer action, using a suitable drill bit, and seal around the base plate to prevent water from penetrating the structure. A wall that has been exposed to moisture for years loses its load-bearing capacity long before anyone notices.
Five Mistakes We Often See
- Use the towel rack or soap dish as a support. Neither is designed to support body weight.
- Install a single bar. Getting into the position and sitting down are two distinct movements that require two different grips.
- Copy the height of the neighboring element. The ranges specified in the Code are general guidelines that should be adjusted based on the individual’s size and mobility.
- Place the bar flat on the drywall alone. A gypsum board has no useful structural capacity for this type of load.
- Forget about going out. The walk from the bath to the towel—often with wet feet—also calls for a place to step and a non-slip mat.
A note on the budget: In Quebec, accessibility renovations may be eligible for financial assistance, including the tax credit for home care and the Home Adaptation Program. Eligibility is determined on a case-by-case basis, before the work begins rather than after.
