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Ottawa winters are the real test of any rental property. With temperatures regularly plunging below −20°C and freeze-thaw cycles pounding foundations, roofs, and pipes, a single missed item on your winterizing checklist can turn into a $15,000 insurance claim. This guide walks you through exactly what to do before the first hard freeze — and how to protect yourself legally.
Ottawa's first hard frost typically arrives in mid-to-late October, and the first significant snowfall usually follows in November. That means your winterization window is September through October — not November when HVAC technicians are booked solid and the freeze is already here.
Book furnace/boiler service. Inspect roof and eavestroughs. Order any replacement parts or filters. Schedule contractor work.
Drain exterior water lines. Clean gutters. Seal gaps and weatherstripping. Test the heating system for a full 24 hours. Distribute tenant winter guidelines.
A mid-winter heating failure is a legal problem as well as a financial one. Ottawa's property standards require landlords to maintain a minimum indoor temperature of 20°C between September 1 and June 1 — a broken furnace in January is an urgent repair obligation.
| System | Recommended service interval | Typical cost (Ottawa) |
|---|---|---|
| Furnace / boiler tune-up | Annually | $150 – $300 |
| HRV / ERV cleaning | Annually | $150 – $400 |
| Duct cleaning | Every 3–5 years | $300 – $600 |
| Water heater inspection | Annually | $100 – $200 |
A burst pipe is one of the most expensive winter emergencies a landlord can face — often $10,000 to $30,000 once you factor in water damage, remediation, and lost rent. The good news: it's almost entirely preventable.
Shut off and drain all outdoor hose bibs and irrigation lines before the first freeze. A trapped line will burst.
Focus on pipes in basements, crawl spaces, garages, and along exterior walls. Foam pipe insulation is inexpensive insurance.
Cold air reaching pipes is the primary freeze risk. Seal gaps around plumbing penetrations in exterior walls and foundations.
Never fully shut off heat in a vacant unit — keep it at a minimum of 15°C. This is the single most common cause of catastrophic winter pipe failures.
On nights below −25°C, advise tenants to let a slow trickle run on taps located on exterior walls.
Insurance tip: Many policies deny claims where a vacant property was left unheated. If your unit will be empty over winter, tell your insurer and confirm coverage conditions in writing.
Ottawa's freeze-thaw cycles are brutal on building exteriors. Ice dams — caused by heat escaping through an under-insulated attic — are the leading cause of winter water intrusion in this city.
| Winterization task | Typical cost (Ottawa) | Potential cost if skipped |
|---|---|---|
| Eavestrough cleaning (x2) | $150 – $400 | $3,000+ (ice dam water damage) |
| Attic insulation upgrade | $1,500 – $4,000 | $5,000+ (recurring ice dams) |
| Pipe insulation | $100 – $500 | $10,000+ (burst pipe + water damage) |
| Weatherstripping | $50 – $200 | Higher heating costs + tenant complaints |
Winterizing isn't solely a landlord task — but you must be clear about what you're delegating. Legally, the duty to maintain the property in good repair remains yours; you cannot contract it away. That said, you can reasonably ask tenants to perform routine tasks like keeping the heat on and reporting issues promptly.
If a unit will be vacant over winter, treat it as a high-risk property. Keep heat at a minimum of 15°C, shut off the main water supply if permissible, drain the water lines, and arrange weekly inspection visits. Notify your insurer of any vacancy lasting more than 30 days.
Ottawa Prime Properties handles complete seasonal winterization for every property we manage — heating prep, pipe protection, exterior checks, and 24/7 emergency response across Ottawa, Kanata, Orléans, and Barrhaven.
Book a Winterization Inspection