When to Repair vs Replace — Ottawa Homeowner Guide (2026)

Every Ottawa homeowner faces the repair-vs-replace decision a dozen times across the life of a home. Repair too often and you waste money chasing aging equipment; replace too aggressively and you pay for unused lifespan. This guide gives you the rules, lifespan tables, and Ottawa-specific cost data to make the right call every time.

The 50% Rule (Universal Starting Point)

Industry-standard decision rule: if the repair cost exceeds 50% of replacement cost AND the equipment is past 50% of its typical lifespan, REPLACE. If both numbers are below 50%, REPAIR. When only one number is above 50%, look at the next 12-month failure probability — old equipment failing on one component usually fails on the next within 18 months. Example: a $585 dishwasher repair on an 11-year-old unit (50% lifespan = 6 years, exceeded; new mid-range $850, 50% = $425, exceeded) → REPLACE.

Lifespan Reference Table (Ottawa Conditions)

Appliances: fridge 12-16 yrs, dishwasher 8-12, washer 10-13, electric dryer 12-15, gas dryer 13-16, range 14-18. HVAC: furnace 18-25 yrs (gas), heat pump 12-15, AC 12-18, water heater (tank) 10-15, tankless 18-22. Building: asphalt shingle roof 18-25 yrs, metal roof 40-60, vinyl windows 25-35, wood windows 30-50, hardwood floors 80+ (refinished), carpet 8-15, exterior paint 7-12, deck (PT lumber) 12-20, composite deck 25-40, driveway (asphalt) 15-25, foundation (concrete) 80-120. Note: Ottawa's ...

Appliances — When the Rule Wins

Apply the 50% rule strictly. Most appliance repairs over $400-$600 on units past year 8 don't pay off because the SECOND major component fails within 18 months. Exception: premium brands (Sub-Zero, Wolf, Miele, Thermador) often repay $1,500+ repairs because new replacement is $8K-$15K. Energy-efficiency factor: a 12-year-old fridge uses 30-40% more electricity than a 2026 Energy Star model — replacement saves $80-$160/year in hydro.

HVAC — Lifespan, Efficiency & Rebates

Furnace under 15 years and not failing safely: REPAIR. Furnace 18-25 years (Ottawa winters are brutal — most don't last past 22): REPLACE, especially if you can claim Canada Greener Homes Grant + Enbridge rebates ($5,000-$7,800 stacked) for high-efficiency or heat-pump conversion. AC under 12 years and using R-410A: usually REPAIR. AC 15+ years using R-22 (phased out, refrigerant now $185-$345/lb): REPLACE. Water heater (tank): leak from tank itself = REPLACE immediately; element/thermostat = RE...

Windows — IGU Repair Almost Always Wins

Window under 20 years with only IGU (foggy seal) failed: REPAIR for $385-$685 vs $1,200-$3,200 replacement. Hardware failure only (cranks, balances): REPAIR for $85-$285. Frame rot, multiple failures, single-glazed glass: REPLACE — especially as part of whole-house retrofit eligible for Greener Homes Grant up to $5,600.

Roof — Age & Damage Pattern Matter

Asphalt shingle roof: minor missing shingles or single leak: REPAIR ($385-$1,250). Multiple leaks, granule loss across multiple slopes, curling/cupping shingles on 18+ year roof: REPLACE ($8,500-$22,000). Metal roof under 30 years with isolated damage: ALWAYS repair. Flat roof (modified bitumen, EPDM, TPO) with isolated leaks at year 12: repair; at year 18+ with multiple leaks: replace.

Frequently Asked Questions

What's the 50% rule for repair vs replace?

If repair cost exceeds 50% of replacement AND equipment is past 50% of typical lifespan, REPLACE. If both are below 50%, REPAIR. When mixed, weigh the next-12-month failure probability.

When should I replace my Ottawa furnace?

Most Ottawa furnaces last 18-25 years (winter strain shortens lifespan). Replace at 18+ years if you can stack Canada Greener Homes Grant + Enbridge rebates ($5,000-$7,800 for high-efficiency or heat-pump conversion). Replace immediately if heat-exchanger crack detected (CO leak risk).

Should I repair or replace my foggy windows?

Almost always REPAIR if the window is under 20 years old. IGU-only replacement: $385-$685 vs full window $1,200-$3,200. Check manufacturer warranty first — many 1995+ windows have 10-20 year IGU warranty making the glass FREE.

When is appliance repair NOT worth it?

When repair cost is over 50% of replacement AND appliance is past 50% of lifespan. Common 'don't repair' scenarios: $585+ dishwasher repair on 11+ year units, $485+ compressor on 13+ year fridges, $400+ washer repairs on 10+ year top-loaders.

How much longer will Ottawa exterior components last?

Ottawa's freeze-thaw cycles cut exterior lifespans 10-20% vs milder climates. Asphalt shingles 18-25 years (vs 25-30 milder). Wood decks 12-20 years (vs 15-25). Exterior paint 7-12 years (vs 10-15). Plan accordingly.