What is a Plumbing Inspection?
A plumbing inspection evaluates a property's water supply lines, drain and waste lines, water heater, fixtures, and connections. Inspectors check for leaks, water pressure, pipe material and condition, drain flow, water heater age and operation, and code compliance. Plumbing issues range from minor fixture repairs to catastrophic failures requiring full re-piping.
General home inspections cover visible plumbing, but a specialty plumbing inspection or sewer scope provides deeper analysis. A sewer scope ($150-$300) uses a camera to inspect the main sewer line from the house to the street, revealing root intrusion, bellied pipes, cracks, and blockages that are invisible from inside the home.
Common plumbing issues by pipe material
Galvanized steel (pre-1960s): Corrodes internally, reducing water pressure and eventually failing. Full replacement recommended if still present. Re-pipe cost: $4,000-$10,000.
Polybutylene (1978-1995): Known for brittle failures and class-action lawsuits. Insurance companies may refuse coverage. Replacement strongly recommended. Re-pipe cost: $4,000-$8,000.
Cast iron drains (pre-1970s): Corrodes over time, causing slow drains and eventual collapse. Replacement cost: $3,000-$10,000 depending on accessibility.
Copper and PEX: Current standards with long lifespans (50+ years for copper, 40+ for PEX). Generally not concerns unless damaged.
Plumbing and investor deals
Pipe material is a critical factor in evaluating older properties. A home with galvanized or polybutylene pipes needs re-piping factored into the repair estimate. Slab-on-grade homes with under-slab plumbing failures are especially expensive to repair ($5,000-$15,000 for tunneling or re-routing). For wholesalers, disclosing known plumbing issues in your deal packages builds credibility with experienced buyers who will discover them anyway.