A plumbing inspection isn't the same as leak detection. Detection responds to a leak you already suspect. Inspection looks for the conditions that lead to one before it happens, which is a meaningfully different, and usually much cheaper, kind of visit.
What a Plumbing Inspection Actually Covers
- Pressure and flow testing at every fixture: Not just a visual check, but confirming performance at each sink, tub, and toilet.
- Pipe age and material identification: Especially important in homes built before 1970, which may still have galvanized supply lines nearing the end of their expected lifespan, or homes from 1978 to 1995, which sometimes carry polybutylene piping.
- Water heater condition: Sediment buildup from hard water, pressure relief valve function, and general age assessment.
- Visible connections and fittings: Under sinks, behind toilets, and at supply line connections, where small leaks often start.
How Often You Actually Need One
Once a year is reasonable for most homes. Older homes with known risk factors, pre-1970 galvanized pipe or 1978 to 1995 polybutylene, benefit from checking twice a year. Rental properties are worth inspecting between tenants, since a slow leak can run an entire lease term unreported.
What Gets Caught Early
A fixture connection that's just starting to seep. A water heater with early sediment buildup, well before it fails outright. A supply line showing early corrosion before it becomes a pinhole leak. None of these are dramatic on their own, but each one is far cheaper to address at this stage than after it's caused visible damage.
Cost of Prevention vs. Cost of Repair
A standard inspection runs $150 to $350 depending on home size. Compare that to the cost of a slab leak repair, water damage restoration, or a full water heater replacement after a failure, and the math generally favors catching problems early. It's most valuable exactly when nothing seems wrong yet, since that's when issues are cheapest to fix.
What to Do With the Findings
A written inspection report should tell you plainly what's holding up fine and what's worth addressing soon versus later. Not everything found needs immediate action, but knowing the difference lets you budget for repairs on your own timeline instead of an emergency one.