What Does a House Inspector Look For: A Plain-Language Guide
What does a house inspector look for during a typical visit? In short, the accessible condition of a home’s major systems and the safety hazards and defects that affect them. A general home inspection is a broad visual survey, not an engineering study, and it follows a defined scope set by trade associations such as ASHI and InterNACHI. Knowing what falls inside that scope — and what does not — helps buyers and sellers read the report accurately, set realistic expectations, and decide when a specialist follow-up is warranted.
The Short Answer: Accessible Systems and Safety
An inspector evaluates the parts of a home they can safely see and reach on the day of the visit. They observe condition, operate components that are designed to be operated, and document defects, hazards, and items nearing the end of their service life. They do not move heavy furniture, open walls, or dismantle equipment. The result is a written report describing each system’s condition and flagging anything that needs repair, monitoring, or further evaluation by a specialist.
The guiding principle is “readily accessible.” If a component is buried behind finished walls, stored possessions, or locked panels, the inspector notes it as inaccessible rather than guessing. That limitation is why the broader home inspector hiring process matters — a thorough inspector documents both what they saw and what they could not.
Structure, Foundation, and Roof
Inspectors start with the bones of the house. On the foundation and structure they look for cracking, settlement, bowing, water staining, and signs of movement in walls, floors, and visible framing. Hairline cracks are common and often cosmetic; stair-step cracking in masonry or doors that no longer close square can hint at structural movement worth a closer look.
On the roof they assess the covering material, flashing, penetrations, gutters, and drainage, plus visible attic framing, sheathing, and signs of past leaks. Roof age and remaining service life are major report items because replacement is expensive. In Colorado’s Front Range, hail damage to shingles is a frequent finding and can affect both insurability and negotiation.
Electrical, Plumbing, HVAC
These three systems generate the most consequential findings. On electrical, the inspector reviews the service entrance, main and sub panels, breaker condition, grounding, and a representative sample of outlets and switches, looking for hazards such as double-tapped breakers, missing GFCI protection in wet areas, and obsolete or recalled panel brands.
On plumbing, they check supply piping, drains, the water heater, visible fixtures, and signs of leaks or corrosion. Functional flow and drainage are tested at fixtures. On HVAC, they operate the heating and cooling equipment in season, inspect the furnace, AC, ductwork, and venting, and note age and apparent condition. A cracked heat exchanger, an AC that will not cool, or an undersized panel are the kinds of items that drive negotiations, as covered in our guide on asking for a price reduction after a home inspection.
Exterior, Interior, and Moisture
Outside the home, inspectors evaluate siding and cladding, trim, windows and doors, decks and porches, grading, and drainage away from the foundation. Poor grading and downspouts that dump against the foundation are common moisture sources that lead to bigger problems.
Inside, they examine walls, ceilings, floors, stairs, railings, windows, and doors for damage, safety issues, and signs of moisture. Moisture intrusion is a recurring theme because it underlies many expensive defects, from rot to mold. Inspectors often use a moisture meter to confirm suspect staining; our explainer on the moisture meter for hardwood floors shows how that tool turns a guess into a measurement.
What the Inspection Does Not Cover
A general inspection is deliberately limited. It does not cover what cannot be safely seen, and it excludes several specialized concerns by default. Radon, mold, asbestos in pre-1978 homes, lead paint, wood-destroying insects, sewer line condition, well water quality, and code compliance are typically separate services performed by specialists or added to the inspection for an extra fee.
The inspection is also not a warranty or a prediction. It reports condition on the day of the visit and does not guarantee that a functioning system will keep working. Understanding these limits prevents two mistakes: panicking over routine notes, and assuming a clean general report rules out every hidden hazard. Many Front Range buyers add radon testing specifically because the region’s geology makes it a meaningful risk a general inspection will not address.
How to Use the Report
Once the report arrives, sort findings into three buckets: safety hazards, major-system defects, and cosmetic or maintenance items. Concentrate attention and any negotiation on the first two. Items flagged “recommend further evaluation” deserve a specialist follow-up during the contingency period rather than a guess, because that phrase signals the inspector reached the edge of what a visual survey can confirm. Treat the report as a maintenance roadmap as much as a negotiation tool — even after closing it tells you what to budget for and watch.
The Difference Between a Defect and Normal Wear
One of the most useful things a homeowner can learn is how inspectors distinguish a true defect from ordinary aging. A defect is a condition that adversely affects a system’s function, safety, or expected life — a leaking valve, a cracked heat exchanger, an active roof leak. Normal wear is the cosmetic and functional degradation any used home shows: scuffed floors, a worn faucet aerator, faded paint, a furnace that works but is past the middle of its service life.
Good reports separate these clearly, because conflating them leads buyers to either panic or overpay for negotiation leverage they do not actually have. An inspector noting that a 16-year-old furnace is “functional but near the end of its typical service life” is giving you a budgeting heads-up, not declaring a defect. By contrast, “furnace will not ignite; recommend evaluation by a licensed HVAC contractor” is a defect requiring action. Learning to read that distinction in the report is what turns a 40-page document from a source of anxiety into a practical decision tool.
Tools an Inspector Uses on the Job
The inspection is primarily visual, but inspectors rely on instruments to confirm what the eye suspects. A moisture meter verifies whether a stain is active or old by measuring moisture in the material rather than guessing from appearance. An infrared thermometer or thermal camera reveals temperature anomalies that hint at missing insulation, air leaks, or hidden moisture, though thermal imaging shows surface temperature patterns rather than seeing through walls. A receptacle tester checks outlet wiring and confirms GFCI function in wet areas.
Inspectors also carry a combustible-gas detector for suspected leaks, a flashlight and ladder for access, and sometimes a borescope to peer into wall cavities or ducts through small openings. None of these tools turns a visual inspection into a destructive one; they extend the inspector’s senses without opening walls. Understanding that the inspection is a tool-assisted visual survey, not an invasive teardown, sets realistic expectations for what the report can and cannot confirm.
Regional Conditions That Shape Findings
What an inspector emphasizes depends partly on where the home sits. Along Colorado’s Front Range, expansive clay and bentonite soils can heave and crack foundations, so inspectors pay close attention to foundation movement, sloping floors, and drainage that directs water away from the structure. Hail is a recurring threat to roofs across the region, and hail bruising affects both insurability and negotiation. The dry climate keeps some moisture problems at bay but makes proper humidification and ventilation worth noting.
Radon is a defining regional concern that a general inspection does not cover by default — the EPA places most Front Range counties in its highest radon zone, which is why so many local buyers add radon testing. In other climates the emphasis shifts: humid regions raise mold and termite concerns, coastal areas raise corrosion and storm exposure. A capable inspector reads the home in the context of its environment, which is one more reason local experience matters when you hire.
Safety Hazards an Inspector Prioritizes
Within the broad scope, inspectors give special weight to conditions that threaten occupant safety, because these carry the highest stakes regardless of cost. Electrical hazards top the list: ungrounded outlets, missing GFCI protection near water, double-tapped breakers, exposed wiring, and obsolete or recalled panel brands that have a documented history of failure. Any of these can be flagged for prompt correction by a licensed electrician.
Combustion and ventilation hazards follow closely. A cracked furnace heat exchanger can leak carbon monoxide, improperly vented water heaters and furnaces can spill exhaust into living space, and missing or non-functioning smoke and carbon monoxide detectors are common findings. Structural and fall hazards round out the category — unstable decks and railings, missing handrails on stairs, trip hazards, and unsafe attic or roof conditions. Inspectors also note gas leaks detected during the visit and recommend immediate professional attention. These safety items deserve a buyer’s first attention in any report, because unlike cosmetic wear they pose a direct risk to anyone living in the home, and addressing them is rarely optional. Recognizing how an inspector weights safety helps buyers read a report with the same priorities the inspector applied.
Limitations and Why Specialists Exist
A general inspection is intentionally a mile wide and an inch deep. The inspector is a generalist trained to recognize problems across every system and, crucially, to know when a problem exceeds what a visual survey can resolve. That is the purpose of “recommend further evaluation” language. A foundation crack pattern that looks structural belongs to a structural engineer; an obsolete or recalled electrical panel belongs to an electrician; suspected mold belongs to a mold assessor; a sewer line belongs to a scope camera operator.
These referrals are not the inspector dodging responsibility — they reflect the honest boundary of a non-invasive, time-limited assessment. Acting on them during the contingency period, while you still have leverage, is how buyers resolve the uncertainties a general inspection surfaces but cannot settle. Treating the general inspection as the first step in due diligence rather than the last word is the mindset that protects buyers best.
It also helps to remember why the general inspection exists in this form. A single generalist who could authoritatively certify every system — foundation, electrical, HVAC, sewer, environmental hazards — would cost far more and take far longer than the typical inspection, pricing most buyers out of any inspection at all. The broad, visual, affordable survey is a deliberate compromise: it catches the great majority of significant problems quickly and points you toward deeper investigation only where the evidence warrants it. Used that way, the inspection delivers enormous value relative to its cost. The buyers who get the most from it are those who understand both what it reliably reveals and where its limits lie, and who follow through on the specialist referrals that close the remaining gaps before committing to the purchase. Knowing what a house inspector looks for, in other words, is less about memorizing a checklist than about understanding the shape of the service: broad, visual, honest about its boundaries, and most powerful when treated as the launch point for informed due diligence rather than a box to check on the way to closing.
References
- ASHI Standard of Practice scope of inspection — ASHI
- InterNACHI Standards of Practice — InterNACHI
- Model residential code references — ICC