5 things to inspect on a house before the inspector

A professional inspector checks hundreds of items, but you can pre-screen for the few problems that most often blow up a deal. A walkthrough with the right eye saves you paying for an inspection on a house you’ll walk away from.

What this walkthrough is, and isn’t

This is triage, not a verdict. The goal is to catch the big, expensive red flags early enough to decide whether a house is worth a paid inspection at all — or whether to negotiate before you spend more. None of it replaces a licensed home inspector, who has the training, tools, and access to find what an untrained walkthrough never will. Think of yourself as deciding whether to keep going, then handing the real assessment to a professional.

Five things you can eyeball

You don’t need tools beyond your eyes, a phone flashlight, and a willingness to look in unglamorous places. Walk the house with these five in mind.

• The roof, from the ground. Step back and look. Missing, curling, or patchy shingles, a sagging ridgeline, or moss and debris suggest age or neglect. Ask how old the roof is and whether there are records of the last replacement — a roof near the end of its life is a large, predictable expense.
• Water, moisture, and drainage. Water is the quiet destroyer of houses. Look for stains on ceilings and walls, a musty smell, peeling paint, or warped flooring. Outside, see whether the ground slopes away from the foundation or toward it — grading that sends water at the house invites trouble. Ask whether the basement or crawl space has ever taken on water.
• The foundation and how the house sits. Walk the perimeter looking for cracks, especially wide, horizontal, or stair-step cracks in masonry. Inside, notice doors that stick or won’t latch, gaps around frames, and floors that slope. Ask whether there’s any history of foundation work or settling.
• The electrical panel and outlets. Open the panel cover if you can and look for obvious red flags — scorch marks, a burning smell, a tangle of mismatched or amateur wiring, rust. At a few outlets, a cheap plug-in tester or simply noting whether kitchen and bathroom outlets have the test/reset buttons (GFCI protection near water) tells you something. Ask the age of the electrical system. Do not poke around inside a live panel — looking is the limit.
• The plumbing you can reach. Open the cabinets under sinks and look for leaks, water stains, corrosion, or a smell. Run faucets to check water pressure and how long hot water takes to arrive. Find the water heater, look for rust or pooled water at its base, and ask its age — like the roof, it’s a known replacement cost as it gets older.

Reading the answers you get

The questions matter as much as the looking, because the answers reveal both the house’s history and the seller’s candor. Vague or evasive responses about a roof’s age, past water intrusion, or foundation repairs are themselves a signal worth weighing. One aging system on its own usually isn’t a dealbreaker — roofs and water heaters wear out on schedules everyone can plan for. The pattern to watch is several big-ticket items all near the end of their lives at once, or any hint of water and foundation problems, which are the ones that turn into open-ended bills. If the walkthrough raises real concern, that’s information for your offer and your decision to inspect — not a reason to skip the professional.

When to call a professional

Once a house clears this informal screen, a licensed home inspector is non-negotiable before you buy. They access the roof, attic, crawl spaces, and systems you can’t safely reach, and they’re trained to read the warning signs an untrained eye glosses over. Anything you spot that points to structure, electrical, or possible mold deserves its own specialist assessment on top of the general inspection — a structural engineer for serious foundation cracks, a licensed electrician for a questionable panel, a qualified professional for suspected mold. Some risks, like older homes that may contain asbestos or lead, also call for specialized testing rather than a guess. Your walkthrough decides whether to keep going; the licensed professionals tell you what you’re actually buying.

The exterior and neighborhood clues most buyers miss

Before you ever get inside, the ground around the house tells a story. Look at how the lot is graded: soil should slope away from the foundation, not toward it. Ground that tilts back at the house, or flower beds and patios that send water toward the walls, is how basements and crawl spaces get wet. Stand back and check that the dirt sits a bit below the level where siding meets foundation, rather than piled up against it.

Then follow the water. Gutters should be attached and clear, and downspouts should carry runoff well away from the house, not dump it at the corner of the foundation. Trees are worth a second look too — large ones crowding the building can drop limbs on the roof and push roots toward the foundation and underground lines over the years. None of this requires touching anything; it’s all visible from the yard.

Keep an eye out for signs of past do-it-yourself work, inside and out. Mismatched patches, paint that seems placed to cover one specific spot, wobbly railings, or repairs that don’t quite line up can hint at problems that were hidden rather than fixed — and they’re worth flagging for the inspector to examine properly. Widen your gaze to the street, as well. Notice where water would go in a hard rain, whether storm drains are nearby, and any watermarks, sandbags, or low spots that suggest the area collects water. A house can be sound while the location quietly floods. All of this is still triage — a sharper-eyed walkthrough, not a substitute for a professional inspection — but it tells you where to point one.