Ontario Building Code Grandfather Clause: What Ends It & What an AODA Retrofit Requires

A lot of Ontario businesses assume that because their building has always operated the way it does, it's exempt from today's accessibility requirements. That assumption has a name — grandfathering — and it's true, up to a point. The trouble is that grandfathered status isn't permanent, and most property owners don't find out it's ended until a renovation, an inspection, or a complaint forces the question.

This guide covers what grandfathering actually means, exactly what ends it, and what an accessibility retrofit involves once it does.

What "grandfathering" means for an existing building

When a building was constructed or last renovated to code, it met the accessibility standards in effect at that time. As Ontario's accessibility requirements have been strengthened since — through the AODA's Design of Public Spaces Standard (O. Reg. 191/11) and successive updates to the Ontario Building Code — older buildings haven't automatically had to retrofit just because the code moved on. That's the grandfathering principle: existing conditions are generally not required to be upgraded to the current standard purely because the standard changed.

The biggest change came on January 1, 2015, when amendments to the Building Code significantly raised barrier-free requirements for new construction and extensive renovations. Ontario's own guidance on those requirements is direct: existing buildings are not affected unless an extensive renovation is planned. A building designed before 2015 was built to the earlier, less demanding provisions — which is exactly why so many older sites have barriers that were never "non-compliant" when they went in.

What grandfathering does not mean is that the building is permanently exempt, or that the owner can ignore the Human Rights Code's separate duty to accommodate. It also doesn't mean the property is exempt from AODA's non-physical requirements — customer service policies, staff training, and communication accessibility apply regardless of when the building was constructed.

What ends grandfathered status

Grandfathering ends when a specific triggering event occurs. At that point, the affected part of the building — and in some cases the whole path of travel to it — has to be brought up to the accessibility requirements in the current Ontario Building Code, not the one in effect when the building was built. The most common triggers are:

1. A major or extensive renovation — particularly one touching entrances, washrooms, or a path of travel.
2. A change of use or occupancy classification for the space.
3. A new building permit issued for renovation or addition work.
4. New construction or redevelopment of the space.
5. Any alteration that would otherwise reduce existing accessibility — this one is never permitted on its own, trigger or not.

What an accessibility retrofit typically involves

Once a trigger applies — or once a self-audit turns up barriers you want to address proactively — a pathway retrofit usually touches some combination of:

• Parking & drop-off — accessible parking ratios, a firm and stable route from parking to the entrance, curb transitions at crossings.
• Entrances — clear door width, power door operators where required, threshold height.
• Walkways & interior path of travel — corridor width, flush flooring transitions, surface conditions along the route.
• Thresholds — level changes, transition strips, and door sills along the route.
• Stairs & handrails — high-contrast, slip-resistant step edges and handrails that can be found and followed.
• Wayfinding — tactile and high-contrast signage at key points along the path.

Not every retrofit needs to touch every category — the barriers that actually exist at your site, and their priority, come out of a proper site audit rather than a generic checklist.

If you'd rather fix barriers before a trigger forces the issue, see our guide to retrofitting for compliance in Ontario.

Self-audit, retrofit, certification: how the process actually works

1. Audit. A site walkthrough against the current Design of Public Spaces Standard and Ontario Building Code accessibility provisions, producing a documented list of barriers.
2. Prioritize. Barriers get ranked by safety/legal exposure and ease of remediation — not every finding needs to happen at once.
3. Retrofit. For each barrier a product can fix, the right product is specified, sourced and installed over the existing surface by our team. Construction items are scoped separately with a general contractor.
4. Certify. A post-installation inspection confirms the completed work meets the standard that applied at the time of installation, documented in a signed completion record — proof of due diligence if the work is ever questioned later.

Frequently asked questions

Is there a grandfather clause in the Ontario Building Code?

Not as a single section with that name. The effect comes from how the Code applies: its requirements govern new construction and renovation work, and existing buildings are generally not required to be upgraded simply because the Code changes. Ontario's guidance on the Code's accessibility requirements states that existing buildings are not affected unless an extensive renovation is planned.

Does a renovation automatically end grandfathered status?

No. Minor repairs and like-for-like replacements generally don't. An extensive renovation, a change of use, or new construction or redevelopment can. Part 11 of the Building Code governs renovations of existing buildings, and whether a specific project triggers upgrades is decided by your municipal building department — ideally before permits are pulled.

Does the AODA require existing buildings to be retrofitted?

Not on its own. The AODA's Design of Public Spaces Standard applies to newly constructed and redeveloped public spaces, not existing ones left as they are. But the AODA's other requirements — customer service, training, communications and, for organizations with 20 or more employees, compliance reporting — apply regardless of building age.

When did Ontario's barrier-free building requirements change?

The most significant update took effect on January 1, 2015, raising the Building Code's accessibility requirements for new construction and extensive renovations. Buildings designed before then were built to earlier, less demanding provisions.

Does grandfathering protect me from a human rights complaint?

No. The Ontario Human Rights Code's duty to accommodate people with disabilities, to the point of undue hardship, applies independently of Building Code compliance. A grandfathered barrier can still be the subject of a complaint.

Can I retrofit before a trigger event?

Yes — and it's often the better position. A proactive retrofit lets you set the scope, phasing and budget, and a documented completion record shows due diligence if the work is ever questioned. See Retrofit for Compliance in Ontario.