Ontario's Bill 23 quietly transformed what homeowners can do with their basements. If you've considered a rental suite in Waterloo Region, here's what the legislation actually allows.
What Bill 23 Is
Bill 23, the More Homes Built Faster Act, is Ontario legislation aimed at increasing housing supply. One of its most impactful provisions lets homeowners add up to three residential units on most urban residential lots without a rezoning application.
That typically means your main dwelling plus two additional units — for example, a basement apartment and a garden suite, or two suites within the home.
The intent is to gently increase density in existing neighbourhoods, and for homeowners it opens the door to creating rental income from space they already own.
What Counts as an Additional Dwelling Unit
An additional dwelling unit (ADU), also called a secondary suite, is a self-contained living space with its own kitchen, bathroom and entrance. A finished basement apartment is the most common ADU in Kitchener-Waterloo.
The key word is self-contained — a rec room or spare bedroom is not an ADU, but a basement unit with its own facilities and exit is.
Other ADU forms include a unit above a detached garage or a garden suite in the backyard, but the basement apartment remains by far the most cost-effective for most existing homes.
Why This Matters for Basements
Before Bill 23, adding a second unit often meant navigating zoning approvals and minor variance hearings. Now, qualifying lots can add units as-of-right, removing a major barrier and timeline risk.
For homeowners, that means a basement suite is faster and more predictable to approve — though you still need a building permit and must meet the Ontario Building Code.
Removing the zoning uncertainty also makes financing and budgeting easier, because you're no longer planning around the risk that a variance application gets denied after you've already spent money on drawings.
What Bill 23 Does NOT Remove
Bill 23 eased zoning, but it did not waive safety requirements. Your basement suite still needs proper egress windows, fire separation, minimum ceiling height, interconnected alarms and a building permit.
Parking, lot coverage and servicing conditions may still apply, so a zoning confirmation with your municipality remains an essential first step.
In other words, Bill 23 makes it easier to get permission to build a suite, not easier to skip the building code. The construction standards are exactly as rigorous as they've always been.
The Opportunity in Waterloo Region
Combine Bill 23 with the region's strong rental demand — driven by the University of Waterloo, Wilfrid Laurier, Conestoga College and the tech sector — and a basement ADU becomes a compelling investment. Suites rent for $1,400–$2,000 a month locally.
The Region of Waterloo has also offered grant programs to encourage secondary suites, which can offset some of the build cost.
Low vacancy and steady population growth mean a well-built basement suite in Kitchener-Waterloo rarely sits empty for long, which is what makes the payback period so attractive.
Common Misconceptions About Bill 23
The biggest misconception is that Bill 23 lets you skip the permit process. It doesn't — it only streamlines the zoning side. Your basement suite still needs a building permit and must pass the same inspections as before.
Another is that 'as-of-right' means no conditions at all. In practice, requirements around parking, lot coverage, servicing and unit size can still apply, which is why confirming your specific situation with the municipality matters.
Finally, some homeowners assume an existing illegal basement unit is automatically legal now. Bill 23 didn't grandfather anything in — an existing unit still has to be brought up to current code and permitted to be considered legal.
How to Get Started
Begin by confirming your lot qualifies, then plan a code-compliant suite around egress, separation and ceiling height. A $55,000–$90,000 build can pay itself back in a few years given local rents.
It helps to work with a contractor who builds legal suites regularly, since they'll already understand how Bill 23 interacts with your municipality's specific requirements.
We help Kitchener-Waterloo homeowners turn Bill 23's flexibility into a legal, income-producing suite. Book a free consultation to see what your property allows.
Key Takeaways
- Bill 23, the More Homes Built Faster Act, is Ontario legislation aimed at increasing housing supply. One of its most impactful provisions lets homeowners add up
- A legal, permitted basement is the only kind that's insurable and adds reliable resale value.
- D&D Interior Services serves Kitchener, Waterloo, Cambridge, Guelph and surrounding areas
- Get a free no-obligation quote — call or book online anytime
Sources & References
- Ontario Building Code — Relevant Standards & Guidelines
- Region of Waterloo — Secondary Suites & Housing Programs
- D&D Interior Services field experience across Waterloo Region
