Does the Ontario Building Code require grab bar blocking in new Ottawa homes?

Yes. Article 9.5.2.4 of the Ontario Building Code requires that in a new house, where wood or steel studs enclose the main bathroom, the walls must be reinforced to permit the future installation of grab bars at the toilet, shower and tub. The rule applies to new construction.

What the rule covers and what it does not

The blocking requirement is about new houses. We did not find whether a renovation of an existing bathroom triggers the same requirement, so if your project involves work on an existing bathroom, ask the City of Ottawa's Building Code Services whether your specific project brings that article into play.

Where grab bars are actually installed in a home, the Ontario Building Code sets a structural standard: the bars must resist a load of at least 1.3 kN applied either vertically or horizontally (Article 9.31.2.3). We found no Part 9 rule on bar positions, heights or lengths for a house. Which positions and heights suit the person using them is a question for whoever advises them on their needs.

One related point worth knowing: the barrier-free section of the Ontario Building Code, Section 3.8, which sets detailed grab bar dimensions and placement rules for public buildings, does not apply to detached houses, semi-detached houses, duplexes, triplexes, townhouses or row houses. If you see those public-building specifications cited for a house renovation, they are a reference point, not a legal requirement for your home.

Wherever bars are added, they must meet the 1.3 kN load standard. Grab bars installed by a contractor run roughly $200 to $400 per bar in published 2025-26 prices; adding blocking where the wall is already closed adds to that cost.

For a new build, the builder is responsible for meeting Article 9.5.2.4. If you are buying a newly built home and want to confirm the blocking is in place, ask the builder before the walls are closed, and ask what documentation they can provide.

If you have questions about a specific project, the form on this site sends your request to Ottawa contractors listed in the Ottawa Construction Network directory who do this kind of accessibility work.