Key takeaways:
- Start winterization in September or early October — before the first freeze.
- DIY winterization costs under $200; professional full-service runs $450–$900.
- Frozen/burst pipes are the most expensive winter damage — averaging $5,000–$15,000.
- Ice dams are the #2 cause of winter damage — prevented by proper attic insulation and ventilation.
- A $500–$900 winterization investment prevents an average of $5,000–$15,000 in repairs — a 10:1 return.
- Critical tasks: furnace service, disconnect outdoor hoses, clean gutters, test CO/smoke detectors.
A Canadian winter will find every weakness in your home — and make you pay for it. Frozen pipes, ice dams, furnace failures, and drafty windows cost thousands in repairs and high energy bills. Spending a weekend on this checklist in October can prevent the most common winter damage and keep your heating costs under control.
The Full Winter Prep Checklist
Heating System
| Task | How | Cost | Priority |
|---|---|---|---|
| Schedule furnace/boiler servicing | Book a licensed HVAC technician for annual inspection and cleaning | $100–$200 | Critical |
| Replace furnace filter | Check every 1–3 months; replace with correct MERV rating | $10–$30 | Critical |
| Test thermostat | Verify heating kicks in at set temperature; replace batteries if applicable | $0–$10 | High |
| Program thermostat schedule | Lower to 18°C when sleeping, 20°C when home; use smart thermostat if available | $0 | High |
| Bleed radiators (if hot water system) | Release trapped air for even heating | $0 (DIY) | High |
| Clean/inspect heat registers and vents | Remove obstructions; vacuum dust | $0 (DIY) | Medium |
| Chimney and fireplace inspection | Hire a WETT-certified chimney sweep if using wood-burning fireplace | $200–$400 | Critical (if applicable) |
| Stock furnace filters for the season | Buy 3–4 replacement filters | $30–$90 | Medium |
| Test carbon monoxide detectors | Replace batteries; replace units older than 7 years | $0–$40 | Critical |
Plumbing and Water
| Task | How | Cost | Priority |
|---|---|---|---|
| Disconnect and drain outdoor hoses | Remove all hoses from outdoor faucets | $0 | Critical |
| Shut off exterior water supply | Close interior shutoff valve for outdoor faucets; open outdoor faucet to drain | $0 | Critical |
| Insulate exposed pipes | Foam pipe insulation on pipes in garage, crawl space, attic, unheated areas | $20–$80 | Critical |
| Locate and test main water shutoff | Know where it is and confirm it works — you will need it in an emergency | $0 | High |
| Drain sprinkler system | Blow out with compressed air or hire an irrigation company | $75–$150 | High (if applicable) |
| Service sump pump | Test the pump; verify the backup battery works; clean the pit | $0–$50 | High |
| Drain outdoor fountains/features | Prevent cracking from freeze/thaw | $0 | Medium |
Exterior
| Task | How | Cost | Priority |
|---|---|---|---|
| Clean gutters and downspouts | Remove debris; flush with water; ensure downspouts direct water 6+ feet from foundation | $0 (DIY) or $150–$300 (pro) | Critical |
| Inspect roof | Look for missing/damaged shingles, cracked flashing, sagging areas | $0 (visual) or $200–$400 (pro inspection) | High |
| Seal gaps around windows and doors | Apply weatherstripping and caulk to any visible gaps | $20–$100 | High |
| Check foundation for cracks | Seal small cracks with hydraulic cement or polyurethane caulk | $10–$50 | High |
| Trim tree branches near the house | Remove branches within 6 feet of the roof; dead branches that could fall under ice/snow load | $0–$500+ | High |
| Store or cover outdoor furniture | Move to garage/shed or use weatherproof covers | $0–$100 | Medium |
| Inspect and seal the driveway | Fill cracks to prevent water intrusion and frost heave | $20–$100 | Medium |
| Clean and store the lawn mower | Drain fuel or add stabilizer; clean the blade | $0–$20 | Medium |
| Prepare snow removal equipment | Service snow blower; stock ice melt (avoid rock salt on concrete) | $20–$100 | High |
Windows and Doors
| Task | How | Cost | Priority |
|---|---|---|---|
| Switch storm windows to winter position | If you have combination storm/screen windows | $0 | High |
| Apply window insulation film | Shrink-wrap film kit on drafty or single-pane windows | $5–$15/window | Medium |
| Check door sweeps and thresholds | Replace worn sweeps that let cold air under doors | $10–$30/door | High |
| Test garage door seal | Close door; look for light gaps at the bottom and sides | $20–$60 (replacement seal) | Medium |
Attic and Insulation
| Task | How | Cost | Priority |
|---|---|---|---|
| Check attic insulation level | Should be R-50 to R-60; if you can see the joists, you need more | $0 (inspection) | High |
| Verify attic ventilation | Soffit vents and roof vents should be clear of insulation and debris | $0 (inspection) | High |
| Seal attic air leaks | Foam or caulk around plumbing stacks, electrical penetrations, and the attic hatch | $20–$100 | High |
Proper attic insulation and ventilation prevent ice dams — the combination of warm attic air melting snow on the roof, which refreezes at the eaves and backs up under shingles.
Safety and Emergency Prep
| Task | How | Cost | Priority |
|---|---|---|---|
| Test all smoke detectors | Press test button; replace batteries; replace units older than 10 years | $0–$40 | Critical |
| Test all carbon monoxide detectors | Press test button; replace batteries; replace units older than 7 years | $0–$40 | Critical |
| Prepare a power outage kit | Flashlights, batteries, candles, matches, blankets, portable phone charger, battery-operated radio | $50–$150 | High |
| Stock non-perishable food and water | Enough for 72 hours | $50–$100 | High |
| Know your emergency shutoffs | Water main, gas main, electrical panel | $0 | Critical |
| Check home insurance coverage | Confirm water damage, ice dam, and sewer backup coverage | $0 (phone call) | High |
Monthly Winter Maintenance
| Month | Tasks |
|---|---|
| November | Final gutter check after leaves fall; test furnace; stock ice melt |
| December | Check furnace filter; monitor for ice dams after first heavy snow; clear snow from foundation vents |
| January | Inspect attic for frost accumulation; check for drafts during cold snaps; monitor pipe areas in extreme cold |
| February | Replace furnace filter; inspect roof after storms; check sump pump before spring melt |
| March | Watch for ice dam melt damage; check basement for water intrusion during thaw cycles; plan spring maintenance |
Cost of NOT Winterizing
| Failure | Average Repair Cost | Insurance Covered? |
|---|---|---|
| Burst pipe (water damage) | $5,000–$15,000 | Usually, minus deductible |
| Ice dam roof leak | $3,000–$10,000 | Varies by policy |
| Furnace failure (emergency replacement in winter) | $5,000–$12,000 | No (maintenance issue) |
| Foundation crack from frost heave | $2,000–$8,000 | Usually not |
| Fallen tree branch on roof | $1,000–$10,000 | Usually, if wind-related |
| Frozen septic system | $1,500–$5,000 | No |
Spending $500–$900 on proper winterization prevents an average of $5,000–$15,000 in potential claims and repairs — a 10:1 to 30:1 return.