The life expectancies of the components of a home depend on the quality of installation, level of maintenance during use, the weather and climate conditions, and the intensity of use. Some components may remain functional while becoming obsolete because of changing style and tastes or technological improvements in new products.

NAHB (National Association of Home Builders) conducted a comprehensive survey of manufacturers, trade associations, and researchers involved in building material products to develop information about the longevity of housing components. Here are some of their findings.

ITEM LIFE IN YEARS
APPLIANCES
Compactor 10
Dishwasher 10
Disposal 10
Dryer 14
Freezer:  
- Compact 12
- Standard 16
Microwave Oven 11
Range:  
- Free-standing and built-in, electric 17
- Free-standing and built-in, gas 19
- High oven, gas 14
Washer:  
- Automatic and compact 13
Exhaust fan 20
BATHROOMS
Cast-iron bathtub 50
Fiberglass bathtub and shower 10-15
Shower Door 25
Toilet 50
CABINETRY
Kitchen cabinets 15-20
Medicine cabinet/bath vanity 20
CEILINGS
Suspension Lifetime
Acoustical Lifetime
COUNTERTOPS
Laminate 10-15
Ceramic tile Lifetime
Wood/butcher block 20+
Granite 20+
DOORS
Screen 25-30
Interior  
- Hollow core
Less than 30-life
- Solid corewood
30-life
Exterior  
- Protected overhang
80-100
- Unprotected and exposed
25-30
Garage door 20-30
Garage door opener 10
FLOORS
Oak or pine Lifetime
Slate flagstone Lifetime
Vinyl sheet or tile 20-30
Terrazzo Lifetime
Carpeting 11
Marble Lifetime
HEATING, VENTILATION, AND AIR CONDITIONING
Air-conditioning unit  
- Central unit
15
- Window unit
10
Air-conditioning compressor 15
Humidifier 8
Water Heater  
- Electric
14
- Gas
11-13
Fan  
- Centrifugal
25
- Axial
20
- Ventilating roof mounted
20
Burner 21
HOME SECURITY
Intrusion System 14
Smoke Detector 12
Smoke/fire/intrusion system 10
LANDSCAPING
Wooden deck 15
Brick and concrete patio 24
Concrete walk 24
Gravel walk 4
Asphalt driveway 10
Sprinkler system 12
Fence 12
MASONRY
Chimney, fireplace, brick veneer Lifetime+
Brick and stone walls 100+
Stucco and mantels Lifetime
MILLWORK
Stairs 50-100
Rails and disappearing stairs 30-40
PLUMBING
Waste pipe  
- Concrete
50-100
- Cast-iron
75-100
Sinks  
- Enamel steel sink
5-10
- Enamel cast-iron sink
25-30
- Porcelain sink
25-30
Faucets  
- Low quality
13-15
- High quality
15-20
ROOFING
Asphalt and wood shingles and shakes 15-30
Tile 50
Slate 50-100
Sheet metal 20-50+
Built-up roofing  
- Asphalt
12-25
- Coat and tar
12-30
SIDING
Gutters and downspouts 30
Siding  
- Wood
10-100
- Metal
50-life
- Aluminum
20-50
- Vinyl
50
WINDOWS
Window glazing 20
Wood casement 20-50
Aluminum casement 10-20
Screen 25-50
WALLS AND TREATMENTS
Drywall and plaster 30-70
Ceramic tile(high grade installation) Lifetime
Source: NAHB Research Center