Home Life Expectancy Guide | How Long Do Home Systems Last?
One of the most valuable things a home inspection provides is context — not just what’s wrong, but how much useful life remains in major systems and components. This guide gives Maryland homeowners and homebuyers a reference for the typical life expectancy of common home systems.
Keep in mind these are general averages. Actual life expectancy varies based on installation quality, maintenance history, climate, and usage. A professional home inspection provides a site-specific assessment.
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Roofing Systems
- Asphalt shingles (3-tab): 15–20 years
- Architectural/dimensional shingles: 25–30 years
- Metal roofing: 40–70 years
- Flat/low-slope (TPO, EPDM): 15–25 years
- Slate: 75–150 years
- Gutters (aluminum): 20–30 years
HVAC Systems
- Central air conditioner: 15–20 years
- Heat pump: 15–20 years
- Gas furnace: 20–30 years
- Boiler (gas/oil): 20–35 years
- Ductwork: 25–30 years (with proper maintenance)
- Thermostat: 10–20 years
Water Heaters
- Gas tank water heater: 8–12 years
- Electric tank water heater: 10–15 years
- Tankless water heater (gas): 20+ years
- Heat pump water heater: 10–15 years
Plumbing
- Copper supply pipes: 50+ years
- PVC supply/drain pipes: 25–40 years
- Galvanized steel pipes: 40–70 years (prone to corrosion)
- Cast iron drain pipes: 75–100 years
- Polybutylene pipes: Prone to failure — replacement recommended
- Sump pump: 7–10 years
Electrical
- Electrical panel (breakers): 25–40 years
- Copper wiring: 100+ years (with proper connections)
- Aluminum wiring: Requires evaluation — fire hazard potential
- GFCI outlets: 15–25 years
- Smoke detectors: 8–10 years
- CO detectors: 5–7 years
Foundation and Structure
- Poured concrete foundation: 100+ years (with proper drainage)
- Concrete block foundation: 100 years
- Wood framing: Indefinite (with proper moisture control)
- Brick exterior: 100+ years
- Wood siding: 20–40 years
- Vinyl siding: 20–40 years
- Fiber cement siding: 25–40 years
Windows and Doors
- Double-pane windows: 15–20 years (seal failure common)
- Vinyl windows: 20–40 years
- Wood windows (maintained): 30+ years
- Fiberglass doors: 30+ years
- Steel entry doors: 30+ years
- Garage doors: 20–30 years
Kitchen Appliances
- Refrigerator: 10–18 years
- Dishwasher: 9–16 years
- Range/oven (electric): 13–20 years
- Range/oven (gas): 15–25 years
- Microwave (built-in): 9–15 years
- Garbage disposal: 8–15 years
Decks and Exterior
- Pressure-treated wood deck: 15–20 years
- Composite decking: 25–30 years
- Concrete driveway: 25–50 years
- Asphalt driveway: 20–30 years
Use This Guide at Inspection Time
When buying a home, knowing the age of major systems helps you estimate upcoming capital expenditures and negotiate accordingly. A 15-year-old roof and a 12-year-old HVAC system aren’t necessarily dealbreakers — but they should factor into your offer and your budget planning.
At Precision Home Inspections, we note the approximate age of every major system and assess its current condition — giving you both the life expectancy data and the real-world condition assessment in one report.