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Most people walking through a house for sale open the kitchen cabinets to count shelves. Very few crouch down and look at the drain trap, run the tub for a full minute, or ask how old the water heater is. That is a shame, because plumbing problems are among the most expensive surprises new owners inherit, and many leave clues in plain sight.
A home inspector will cover the basics, but inspectors are generalists working against the clock. When the walkthrough raises more questions than it answers, bringing in a licensed Florence plumber for a sewer camera run or a second opinion usually costs a fraction of what a single hidden repair would. Before that call, though, here is how to read a house the way a plumber would, starting at the street and working inward.
Start at the Curb Before You Reach the Door
The water meter box near the street tells you more than you might expect. With every faucet in the house off, the small leak indicator on the meter face should sit still. If it creeps, water is escaping somewhere between the meter and the fixtures, possibly under a slab where nobody will see it until the bill arrives.
Water pressure matters too. A cheap screw-on gauge from any hardware store fits an outdoor spigot, and the reading should land somewhere between about 40 and 80 psi. Anything higher strains supply lines, toilet fill valves, and water heaters, and plumbing codes generally call for a pressure reducing valve once pressure climbs past 80. If the house already has one, ask when it was last replaced, since these valves tend to wear out within a decade or so.
Find the main shutoff while you are outside. A seized or corroded valve is a small repair worth making before move-in day.
The Yard Hides the Costliest Pipe
The sewer lateral running from the house to the city connection is the single most expensive plumbing component a buyer can inherit, and it is completely invisible. Red clay soil common around the Shoals expands when wet and shrinks during dry spells, and that seasonal movement can shift joints over time. Mature oaks and maples planted close to the house send roots toward any small crack carrying moisture and nutrients.
Older lines may be cast iron, clay tile, or in some mid-century neighborhoods a bituminous fiber pipe known as Orangeburg that softens and collapses with age. A cleanout cap in the yard makes a camera inspection simple. If no cleanout exists, note it, because adding one becomes part of any future repair bill.
Unusually green patches, soggy spots, or a sewer smell outdoors all deserve a closer look.
Under the House Is Where the Story Gets Told
Many homes in the area sit on crawlspaces, and the crawlspace is essentially an open book. Bring a flashlight and look at what the supply and drain lines are made of. Each material tells you roughly how long you have.
- Galvanized steel shows up in older homes and corrodes from the inside, slowly narrowing until pressure drops at every fixture.
- Polybutylene, a gray plastic installed from the late 1970s into the mid 1990s, has a well documented history of failing at fittings and is often flagged by insurers.
- Copper generally lasts decades, though green crusting at joints points to slow leaks.
- CPVC and PEX are newer and usually signal a repipe or recent construction.
- Cast iron drains can last a very long time but crack along the bottom where waste has eroded them.
Watch for stains on the subfloor beneath bathrooms or pipes resting on bare soil. Missing insulation on supply lines in a vented crawlspace is an invitation for frozen pipes during the occasional hard January freeze.
The Closet With the Water Heater
Every tank has a data plate, and the serial number usually encodes the manufacturing date, though each brand uses its own format. A tank past ten or twelve years is living on borrowed time, especially where mineral buildup has been settling at the bottom for years.
Check that the temperature and pressure relief valve has a discharge pipe running down toward the floor or outside rather than ending in midair. Look for rust streaks at the base and, on gas models, scorch marks around the burner access. Homes with a pressure reducing valve often need a thermal expansion tank beside the heater, and its absence is a common code issue that inspectors catch late.
Kitchens, Baths, and the Simple Stress Test
Inside the living space, the trick is to use the plumbing the way a family would on a busy morning rather than one fixture at a time.
- Run the kitchen faucet and the bathroom sink together and watch both drains.
- Flush a toilet while the shower is running and notice whether the shower temperature swings sharply.
- Fill the tub several inches, then pull the plug and listen for gurgling in nearby drains.
- Rock each toilet gently with a knee to see if it moves at the base.
Slow drains on one fixture usually point to a local clog. Slow drains everywhere at once suggest a problem in the main line or the vent stack. A toilet that rocks may have a failed wax seal, and soft flooring around it often means water has been seeping into the subfloor for months.
Under the kitchen sink, look for a dishwasher drain hose looped up high before it connects, which keeps dirty water from siphoning back. Swollen particleboard in the cabinet floor gives away an old or ongoing leak.
Laundry Rooms and Outdoor Spigots
Washing machine hoses are a leading source of household water damage because a burst hose keeps flowing until someone notices. Rubber hoses bulging near the fittings should be replaced with braided stainless lines.
Outside, turn each spigot on and off. Frost free hose bibs are standard in newer construction, while older ones can split inside the wall after a freeze and leak only when the faucet is used, which makes them easy to miss.
Turning What You Find Into Leverage
None of these findings automatically kills a deal. A thirteen year old water heater, a missing expansion tank, or a few runs of galvanized pipe are ordinary realities in established neighborhoods. What matters is putting a number on them before you sign rather than after.
Written estimates from a licensed professional carry far more weight with a seller than a buyer’s worried guess. In Alabama, anyone doing plumbing or gas work for the public must be certified, and the Alabama Plumbers and Gas Fitters Examining Board offers a licensee search so you can confirm credentials before trusting an estimate. Real figures let you ask for a price reduction, a closing credit, or a seller funded fix.
A house can look perfect in listing photos and still be carrying decades of slow decline behind its walls and beneath its yard. Twenty minutes with a flashlight, a pressure gauge, and a running faucet will not catch everything, but it shifts the conversation from hoping for the best to knowing what you are buying.
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