How Long Does Everything in Your Home Last?

One of the most useful things you can know as a homeowner is when things are going to wear out. Not because you can stop it from happening, but because anticipating it puts you in a planning posture instead of an emergency posture. An HVAC system that dies unexpectedly in August costs the same to replace as one you knew was coming — but the emergency replacement happens faster, with less time to get competitive quotes, and usually at a premium.

What follows is a comprehensive guide to the expected lifespans of major home systems and components, along with the warning signs that indicate you're approaching the end of the line.

Roofing

• 3-tab asphalt shingles: 15–20 years

• Architectural (dimensional) asphalt shingles: 25–30 years

• Metal roofing: 40–70 years

• Clay or concrete tile: 50+ years

• Wood shake: 20–30 years (highly dependent on climate and maintenance)

Warning signs: curling or cupping shingles, granule loss (check your gutters — excessive granules mean the shingles are shedding protective coating), missing shingles, dark staining, daylight visible in the attic. Roof replacement is one of the largest homeowner expenses: $8,000–$25,000+ depending on materials, size, and complexity.

HVAC Systems

• Central air conditioning: 15–20 years

• Gas furnace: 20–30 years

• Heat pump: 10–15 years

• Boiler: 15–30 years (electric shorter, gas longer)

• Window AC units: 8–10 years

Warning signs: uneven heating or cooling, unusual noises (grinding, banging, squealing), rising energy bills without explanation, frequent cycling, visible rust or corrosion. Annual professional maintenance extends life significantly. A furnace that's been serviced every year will last longer than one that hasn't. Replacement costs: $4,000–$15,000 for a full system replacement.

Water Heater

• Traditional tank water heater (gas): 8–12 years

• Traditional tank water heater (electric): 10–15 years

• Tankless water heater: 20+ years

• Heat pump water heater: 10–15 years

Warning signs: rust-colored water, rumbling or popping sounds during heating (sediment buildup), water around the base of the unit, inconsistent hot water supply, visible corrosion on the tank or connections. Annual flushing extends life in hard-water areas. Replacement: $900–$3,000 for tank, $1,500–$4,000 for tankless installed.

Plumbing

• Copper supply pipes: 50+ years

• Galvanized steel supply pipes: 20–50 years (varies widely — older galvanized pipes are prone to corrosion and reduced flow)

• PVC drain pipes: 25–40 years

• Cast iron drain pipes: 50–100 years

• Water supply lines to fixtures (braided stainless): 10 years (replace proactively — these lines are a leading cause of major water damage when they fail)

The main thing to know about plumbing is that the supply lines to individual fixtures are the most failure-prone and most ignored component. Those braided stainless hoses under your sink and behind your toilet? Replace them every 10 years whether they look fine or not. The cost is under $20 per line. A burst supply line on a second floor can cause tens of thousands in damage.

Electrical

• Wiring (copper): 50–100 years

• Wiring (aluminum — common in homes built 1965–1973): requires inspection; can be problematic at connections

• Electrical panel (circuit breaker): 25–40 years

• Light switches and outlets: 15–25 years

Warning signs for electrical issues: frequently tripping breakers, flickering lights, discoloration or warm outlets, burning smell, breakers that won't reset. If your home has a Federal Pacific Stab-Lok or Zinsco electrical panel, have it evaluated by an electrician — these brands have documented reliability and safety concerns and many electricians recommend proactive replacement.

Appliances

• Refrigerator: 10–18 years

• Dishwasher: 9–12 years

• Range/oven (electric): 13–15 years

• Range/oven (gas): 15–17 years

• Microwave: 9 years

• Washing machine: 10–14 years

• Dryer: 13 years

• Garbage disposal: 8–12 years

Appliances are the most unpredictable category — some fail at 8 years, some last 20. Extended warranties on appliances over $1,000 are worth considering, particularly for refrigerators and washing machines, which tend to have expensive repair parts.

Exterior

• Wood siding (with maintenance): 20–40 years

• Vinyl siding: 25–40 years

• Fiber cement siding: 25–40 years

• Brick exterior: 100+ years (mortar may need tuck-pointing every 25–50 years)

• Exterior paint (on wood): 5–10 years depending on climate and sun exposure

• Composite decking: 25–30 years

• Pressure-treated wood deck: 15–25 years with maintenance

• Concrete driveway: 25–50 years

• Asphalt driveway: 20–30 years (seal every 3–5 years to extend)

Windows and Doors

• Wood windows: 20–50 years

• Vinyl windows: 20–40 years

• Aluminum windows: 15–20 years

• Double-pane seal failure (foggy windows): 10–20 years (seals fail before the window frame)

• Exterior doors (fiberglass): 30+ years

• Exterior doors (wood): 30+ years with maintenance

• Garage door: 15–30 years

• Garage door opener: 10–15 years

Interior

• Carpet: 5–15 years (depends on traffic and quality)

• Hardwood floors: 25–100 years (can be refinished multiple times)

• Laminate flooring: 15–25 years

• Tile (properly installed): 75–100+ years

• Interior paint: 5–10 years in high-traffic areas

• Kitchen cabinets: 50+ years (hardware and finishes wear sooner)

• Countertops (granite/quartz): 25–100+ years

• Countertops (laminate): 10–20 years

The Most Important Number

If you can only track one number, track the age of your water heater. It's the system most likely to fail catastrophically (flooding) without obvious warning, it has the clearest lifespan (8–12 years for a tank unit), and replacement is straightforward. If you don't know how old your water heater is, look at the serial number on the unit — most manufacturers encode the manufacture date in the first few characters, and manufacturer websites provide decoding guides.

Beyond the water heater, build a simple spreadsheet of your major systems, their approximate age, and their expected lifespan. KotiCare does this automatically from your inspection report — tracking every system’s age and condition, surfacing reminders before failures occur, and connecting you with vetted contractors when work is needed. Whether you use a tool like KotiCare or build a manual tracker, this document alone will transform your home maintenance from reactive to proactive.