Renting should not mean choosing between “affordable” and “healthy.” A few simple checks can prevent the most common rental headaches: stale air, lingering odours, moisture, mould, and safety issues that only show up when it’s already a mess.
This guide is Ontario-focused and written for both sides, renters and landlords.
The ground rules in Ontario: who’s responsible for what?
In Ontario, landlords must keep rental properties in a good state of repair and make sure they meet health, safety, housing, and maintenance standards. Those standards come from municipal property standards bylaws and Ontario’s provincial maintenance standards.
Tenants are generally expected to keep the unit reasonably clean and to report problems promptly, especially leaks or anything that could cause damage if ignored. (This is practical reality even when the law gets detailed.)
Not legal advice, just the real-world “how to avoid headaches” version.
The healthy rental checklist
1) Air and humidity: stop problems before they start
Health Canada’s guidance on moisture and mould is blunt for a reason: control moisture first. Moisture problems tend to be the engine behind mould growth.
Renters
- Use bathroom and kitchen exhaust fans during and after showers and cooking.
- Watch for condensation on windows and musty smells, those are early signals.
- Report leaks right away (under sinks, around toilets, ceiling stains, foundation dampness).
Landlords
- Treat leaks like a “same-week” issue, not a “sometime” issue.
- Check fan operation, dryer venting, and bathroom/kitchen ventilation during turnovers.
2) Moisture and mould: handle it the right way
Health Canada recommends finding and fixing the moisture source, then cleaning or remediating based on the size and severity of the problem.
A simple, practical approach
- Small, surface-level patches may be manageable if the moisture cause is fixed.
- Bigger areas, repeated regrowth, or hidden mould usually means you need professional help. Health Canada’s guide includes considerations for assessing the magnitude and when to hire a professional.
3) Carbon monoxide safety: non-negotiable
Ontario has specific carbon monoxide alarm requirements, and for rental homes, the landlord is responsible for complying with those requirements.
If your rental has fuel-burning appliances (gas furnace, water heater, fireplace) or an attached garage, CO safety should be part of your regular checklist.
4) Cleaning products: don’t accidentally gas your own lungs
Health Canada warns Canadians: never mix bleach with other cleaning products, because it can create toxic gases.
Renters and landlords
- Use one product at a time, follow the label, and ventilate the space.
- If someone is sensitive to fragrances or chemicals, choose unscented products and improve ventilation.
5) Pest prevention and response: fast action beats frustration
Ontario landlord guidance notes that landlords must take steps to control pests (examples listed include cockroaches and mice).
Renters
- Report signs early (droppings, gaps, activity), and keep food sealed.
Landlords - Treat pest reports as a priority maintenance item, document treatments, and follow up.
A simple “move-in / turnover” routine that prevents most problems
For landlords (quick system)
- Do a walkthrough checklist: fans working, no leaks, windows close properly, drains run clean, alarms present and functional.
- Provide tenants a one-page “how to live in this home well” sheet: where the water shutoff is, what to do if there’s a leak, how to use the fan, how to report issues.
For renters (quick habits)
- Run fans, keep humidity in check, report leaks early.
- Do not disable alarms.
- If something feels off, smells musty, or keeps coming back, it’s worth flagging.
Bottom line
A healthy rental home is rarely about fancy upgrades. It’s usually about moisture control, ventilation, safe cleaning, and clear communication. The earlier you catch issues, the cheaper and easier they are to fix.
Sources
- Ontario Landlord and Tenant Board, Maintenance and Repairs (landlord must meet health/safety/maintenance standards).
- Ontario regulation O. Reg. 517/06: Maintenance Standards.
- Health Canada, Addressing moisture and mould and mould prevention guidance.
- Government of Ontario, Carbon Monoxide Alarm Rules (existing homes) noting landlord responsibility in rentals.
- Health Canada, Household chemical safety and warning not to mix bleach with other chemicals.
