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Most water heater labels note the date of manufacture.
Some water heaters, however, note when its warranty expires. Remember,
yellow energy efficiency stickers for the TPR valve became mandatory in 1970.
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Manufactured trusses became popular in the late 1960’s.
Rafters with center-to-center measurements that exceed 24" suggest a home was built
before 1960. Full 2x4 rafters, also known as rough-hewn, often exceed 24" centers and
were common prior to 1945.
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A home was built prior to 1960 if sliding glass doors are not equipped with tempered glass.
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Cast Iron Waste Pipe, New construction began installing ABS in most locales between 1970 and 1975.
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Galvanized Water Supply Pipe,
These pipes were replaced in new construction in most locations with
copper between 1965 and copper became mandatory about 1970.
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Look for the gas shut-off valves of water heaters and furnaces.
If the original municipal inspection tag is still there, it should
have a date, often handwritten, with the approval date for gas meter installation.
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No damper usually indicates the fireplace was built prior to 1940.
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A chimney without a clay flue tile liner was probably built prior to 1945
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A toilet tank or lid, sometimes has a date stamp. A toilet without a date stamp
means that it was probably manufactured after 1990.
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By checking the underside of bath, kitchen, and
laundry sinks you can find raised numbers on iron fixtures that indicate
the date or they may have white-stenciled numbers on their bottoms
that indicate the date.
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Look on garage walls for old permit tags, which indicate the
date of the original construction or remodeling. Obviously each one of these items must
be used with some common sense. For example, if the water heater appears new in an
old home you could not use the dates from that item to date the house.
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Look for dates on labels of the service panel (electric breaker box).
If the UL symbol is on this tag, and year of UL’s approval is usually
a date within 5 years of installation.
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Each one of these items must be used with some common sense. For example,
if the water heater appears new in an old home you could not use the dates from
that item to date the house.
For Inspection Information
Or to schedule inspections call 970-686-5791 or
720-301-0769.
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