What to Look for in a Home Inspection
A home inspection is one of the few moments in a real estate deal where a buyer gets an honest, third-party look at the house behind its fresh paint. Knowing what to look for in a home inspection means more than hoping the inspector finds problems. It means understanding which systems carry the most financial risk, how to read the report once it lands in your inbox, and which findings deserve a serious conversation with the seller. This guide walks through the major categories buyers should track, the red flags that should slow a deal down, and the difference between a cosmetic gripe and a genuine structural concern.
What does a home inspection actually cover?
A standard inspection is a visual, non-invasive review of a home’s readily accessible systems. The inspector does not open walls, dig up sewer lines, or guarantee that hidden defects do not exist. Trade groups like the American Society of Home Inspectors publish a Standards of Practice that defines the baseline scope: roof, exterior, structure, electrical, plumbing, heating, cooling, interior, insulation, and ventilation.
That scope sounds broad, and it is. But it has limits. Inspectors generally will not move heavy furniture, test for radon or mold unless you pay for an add-on, or comment on cosmetic taste. Understanding the boundary between included and excluded items keeps your expectations realistic. If you want a clear primer on the overall process, our overview of hiring a home inspector and what the inspection covers sets the stage well.
The big-ticket systems worth watching
Not every defect carries the same weight. A loose cabinet hinge costs ten dollars. A failing foundation costs tens of thousands. Buyers should mentally sort findings by repair cost and safety, and pay closest attention to the systems below.
Roof and attic
The roof is expensive to replace and quick to cause water damage when it fails. Inspectors note the apparent age of the roof covering, missing or curling shingles, flashing condition around chimneys and vents, and signs of past leaks in the attic. In the attic, look for staining on the underside of the decking, compressed or missing insulation, and evidence of inadequate ventilation. A roof near the end of its service life is a legitimate negotiating point.
Foundation and structure
Structural issues frighten buyers more than any other category, and for good reason. Inspectors watch for stair-step cracks in masonry, doors and windows that stick, sloping floors, and horizontal cracks in foundation walls, which can signal soil pressure. Many of these clues are cosmetic. Some are not. When an inspector flags structural movement, the right next step is often a licensed structural engineer rather than a panicked walk-away.
Electrical system
Electrical defects are a leading source of house fires, so they sit high on the safety list. Watch for outdated panels, ungrounded outlets, missing GFCI protection in kitchens and bathrooms, and amateur “handyman” wiring. Older homes may still have knob-and-tube or aluminum branch wiring, both of which insurers scrutinize. An electrical home inspection walkthrough explains what these findings mean for safety and insurability.
Plumbing and water
Plumbing problems hide well. Inspectors run faucets, flush toilets, and look under sinks for active leaks and corrosion. They note the water heater’s age and condition, the pipe materials, and drainage speed. Polybutylene supply lines and galvanized steel pipes both have known failure patterns. Slow drains across multiple fixtures can hint at a main-line problem that a standard inspection cannot fully diagnose.
HVAC
Heating and cooling equipment is costly to replace and easy to neglect. Inspectors check the furnace and air conditioner age, test operation in season, and look for cracked heat exchangers or refrigerant issues that they can observe without specialized tools. A furnace past 20 years or an air conditioner past 15 is approaching the end of its expected life, even if it runs today.
Red flags that should slow a deal down
Some findings are routine. Others warrant a pause. Active water intrusion, evidence of foundation movement, knob-and-tube wiring, an overloaded electrical panel, and signs of a failing roof all belong in the “slow down and investigate” column. So does anything suggesting a prior fire, persistent moisture, or major systems installed without permits.
Permit history matters more than buyers expect. A finished basement or added bathroom completed without permits can mean substandard work hidden behind drywall, and it can complicate resale. When the inspection report mentions unpermitted work, ask your agent to pull the permit record from the local building department. Our list of issues that commonly fail a home inspection covers the patterns that turn up again and again.
How to read the inspection report
A good report is long, photo-heavy, and sometimes intimidating. Forty or fifty flagged items is normal, even on a well-kept house, because inspectors document everything they see. The goal is not to count findings but to weigh them.
Start by separating the report into three buckets. The first is safety and structure: anything that threatens health or the building’s integrity. The second is major systems near the end of life: roof, HVAC, water heater. The third is maintenance and cosmetic items: caulking, minor cracks, worn fixtures. Most negotiation energy should go toward the first two buckets. Sellers rarely renegotiate over a sticky window or a missing outlet cover.
Read the inspector’s summary, but do not stop there. The detailed body of the report explains the severity and recommended action for each item. If a finding is unclear, call the inspector. Reputable inspectors expect follow-up questions and will walk you through their reasoning without trying to sell you anything.
When to bring in a specialist
A general inspector is a generalist by design. When the report flags something serious, the right move is often a specialist who can open up the problem. A structural engineer evaluates foundation and framing concerns. A licensed electrician assesses panel and wiring questions. An HVAC contractor inspects suspect heating equipment. A sewer scope, ordered separately, sends a camera down the main line to check for root intrusion or collapse in older homes.
These follow-ups cost money, but they convert vague worry into a concrete repair estimate. A foundation crack that an engineer deems cosmetic is a very different negotiation than one that needs piering. Buyers who invest in the right specialist report often save far more than the inspection cost at the closing table. The general inspector’s value here is in knowing when to recommend a specialist; a good one flags the issue clearly and names the right expert to call, rather than either downplaying a real concern or alarming a buyer over a minor one.
Using the inspection to negotiate
The inspection contingency in most contracts gives buyers a window to request repairs, ask for a price reduction, seek a closing credit, or walk away. Which path fits depends on the findings and the local market. In a competitive market, sellers may resist repair demands; in a slower one, buyers hold more leverage.
Focus requests on safety, structure, and major systems backed by documented findings and, where helpful, a specialist estimate. A targeted ask supported by the report and a contractor quote lands far better than a long wish list of minor gripes. Lean on your real estate agent, who has watched dozens of these negotiations and knows what tends to move a particular seller.
What a standard inspection does not cover
Just as important as knowing what to look for is knowing what a general inspection will not tell you. The standard scope is visual and non-invasive, which leaves several real risks unexamined unless you order them separately. Buyers who assume the base inspection covers everything are often surprised later.
Radon, the second-leading cause of lung cancer, is not part of a standard inspection and requires a dedicated test. Mold sampling, sewer line scoping, lead paint assessment in pre-1978 homes, and asbestos testing are all add-ons. Wells and septic systems usually need specialist evaluation. Pools, spas, and outbuildings may be excluded or limited. A general inspector also will not predict how long a working system will last; they report its current condition, not its future. Understanding these gaps lets buyers decide which add-ons are worth ordering for a particular property, especially an older home or one in a known radon zone.
Questions to ask before the inspection
The value of an inspection starts before the inspector arrives. Asking the right questions when booking sets expectations and surfaces problems early. Confirm the inspector’s credentials, whether they belong to a professional association like ASHI or InterNACHI, and how long their reports typically take to produce. Ask for a sample report so you know what you are paying for; a thin checklist and a detailed photo-rich report are very different products.
Ask which add-on services they offer and whether they recommend any for this specific home given its age and location. Ask whether you can attend, since walking the property alongside the inspector is one of the best ways to understand the findings. Finally, ask how they handle questions after the report is delivered. A good inspector expects follow-up calls and answers them without trying to upsell repairs. The inspector who welcomes your questions before the job is usually the one who communicates clearly in the report itself.
Common mistakes buyers make
Even careful buyers stumble in predictable ways. The most common mistake is fixating on the number of findings rather than their severity, panicking over a forty-item report that is mostly cosmetic. The second is the opposite error: glossing over a serious structural or electrical note because the home looked beautiful and move-in ready. Cosmetics and condition are not the same thing, and a freshly staged home can hide deferred maintenance behind new paint.
Another frequent misstep is waiving the inspection entirely to win a competitive bid. In a hot market the pressure is real, but skipping the inspection trades a few thousand dollars of negotiating leverage for the risk of a five-figure surprise after closing. Some buyers also skip recommended specialist follow-ups to save money, then negotiate from vague worry instead of a concrete estimate. The final mistake is treating the inspection as a pass-or-fail exam. It is not. The goal is information, and a clear-eyed reading of that information, weighted by cost and safety, is what turns a long report into a confident decision.
One more error deserves mention: ignoring the inspector’s verbal cues. Inspectors often share their candid read of a home during the walkthrough in ways that do not always land with the same weight on the page. If an inspector pauses at the panel, lingers in the crawl space, or mentions that a system is “at the end of its life,” those moments carry information. Buyers who attend and listen catch nuance that a buyer reading the report alone may miss. Combining the written report with what you observed and heard on site gives the fullest picture of what to look for and what to act on.
References
- ASHI Standards of Practice for home inspections — American Society of Home Inspectors
- InterNACHI Residential Standards of Practice — InterNACHI
- Radon and indoor air quality guidance for buyers — U.S. EPA
- CDC guidance on home moisture and mold concerns — Centers for Disease Control and Prevention