Some factors to take into account when determining if an Inspection is due:
WHAT YEAR THE STRUCTURE WAS BUILT
If you live in a home, or purchased a building that was constructed prior to 1960, there is a very likely chance that the plumbing system is comprised of steel piping and should undergo annual to semi-annual inspections to detect pipe corrosion, leaks, breaks, and lead in the water supply.
Often common on lots with mature trees, or a lot of space between the home and main line, are large trees that have been growing for many years. What may sound harmless to some can be a very expensive burden to homeowners. Mature trees have very extensive root systems that are prone to compromising durable piping systems. It is important to undergo routine maintenance and have your lines periodically scoped to detect collapsed, misaligned, and leaking pipes.
MOVING INTO A NEW HOME OR OFFICE BUILDING
If you recently purchased real estate, it is best practice to have a thorough Plumbing inspection performed by someone other than a home inspector. Often times it is the minute things that can be easily overlooked, that lead to bigger problems down the road.