What Do Home Inspectors Look For? A Clear Guide
Buyers scheduling an inspection often wonder what do home inspectors look for during those few hours on site. The short answer is the systems and structures that keep a house safe, dry, and functional, evaluated visually and without dismantling anything. An inspector moves methodically from the roof down to the foundation, testing what can be tested and documenting what cannot. Understanding the checklist in advance helps buyers follow the walkthrough, ask better questions, and put the resulting report in context rather than fearing every flagged item.
The big four: structure, roof, electrical, plumbing
Most inspectors prioritize the systems that cost the most to repair. The structure includes the foundation, framing where visible, and signs of settlement such as stair-step cracks in masonry or sloping floors. The roof covering, flashing, and drainage get close attention because water intrusion drives so much hidden damage.
Electrical service, the panel, breakers, grounding, and a sampling of outlets are checked for safety hazards. Plumbing supply lines, drains, water heater condition, and visible leaks round out the high-priority list. These four areas account for the majority of significant findings.
Inspectors weight these systems heavily because they combine high repair cost with safety stakes. A failing roof or a hazardous panel threatens both the wallet and the household, which is why they dominate the summary section of most reports. Buyers who want to understand the broader process can review the guide to hiring a home inspector alongside this checklist.
That said, a thorough inspector does not stop at the big four. The smaller systems and finishes still get attention, because a pattern of minor issues can hint at deferred maintenance or a larger underlying problem. The priority ranking simply tells buyers where to direct their attention and their negotiating energy first.
The roof and exterior envelope
From the ground, a ladder, or sometimes a drone, the inspector assesses shingle wear, missing or curling tiles, flashing around penetrations, and the condition of gutters and downspouts. Chimneys, vents, and skylights are common leak points.
On the exterior walls, the inspector looks at siding, trim, caulking, and grading. Soil that slopes toward the foundation, or downspouts that dump water at the base of the house, are flagged because they invite moisture into basements and crawl spaces.
The inspector also estimates the roof’s remaining service life when possible. A roof near the end of its life is not a defect, but knowing it has a few years left helps buyers budget for a major upcoming expense rather than meeting it as a surprise.
Foundation and basement
Inside, the inspector examines the foundation walls and floor for cracks, efflorescence, water staining, and signs of past flooding. In crawl spaces, they check for moisture, rot, pest damage, and adequate ventilation.
Front Range buyers should note that a general inspection does not test for radon, which is a separate measurement. Because the region sits in a high-radon zone, many pair the inspection with a dedicated radon test for their Colorado home during the same due-diligence window.
Distinguishing cosmetic cracks from structural ones is a core inspector skill. Hairline shrinkage cracks in concrete are normal; horizontal cracking, bowing walls, or stair-step cracks that widen signal movement that may warrant a structural engineer’s evaluation. The report flags the difference so buyers know which cracks to worry about.
Electrical system safety
The electrical evaluation focuses on hazards rather than code perfection. Inspectors look for an appropriately sized service, a panel free of double-tapped breakers and corrosion, proper grounding and bonding, and the presence of GFCI and AFCI protection where required.
They test a representative sample of outlets and switches, check for open junction boxes, and note older or recalled panel brands. Anything beyond their visual scope gets referred to a licensed electrician for a closer look.
Certain older panel brands and aluminum branch wiring draw particular attention because they carry documented fire risks. An inspector who spots one of these will recommend evaluation by a licensed electrician, since the safe remedy depends on specifics the inspection cannot fully assess.
Heating, cooling, and ventilation
The inspector runs the furnace and air conditioner through a normal cycle when weather allows, noting age, responsiveness, and obvious defects. A cracked heat exchanger, rust, or a system well past its expected life is a significant finding.
Ventilation matters too. Bathroom and kitchen exhaust fans, dryer venting, and attic airflow all affect moisture and air quality. Poor ventilation often shows up later as condensation, mold, or premature material failure.
The inspector also checks that combustion appliances vent properly and that there are no obvious signs of backdrafting. A furnace or water heater that vents into the living space rather than outside is a safety concern that gets flagged for prompt correction.
Water heater and plumbing fixtures
The inspector checks the water heater’s age, capacity, venting, and the presence of a temperature-and-pressure relief valve. Fixtures are run to confirm flow, drainage, and the absence of leaks under sinks. Slow drains and corroded supply valves get noted.
Water pressure and the consistency of hot water across fixtures get a quick check as well. Very low pressure can hint at supply-line problems, while no hot water at a distant fixture may point to a failing water heater or a plumbing issue worth investigating.
Interior, insulation, and moisture clues
Inside the living space, inspectors look at windows, doors, walls, ceilings, and floors for damage, water staining, and operational problems. Stained drywall or warped trim can signal a hidden leak worth investigating.
Attic insulation levels, vapor barriers, and signs of past moisture intrusion are recorded. When a report flags suspected moisture, buyers sometimes follow up with specialty testing, much as they would order a separate broader property inspection for concerns outside the general scope.
Windows get individual attention. Failed seals showing fog between panes, sashes that will not stay open, and rot around frames all appear in reports. These are rarely deal-breakers but add up to a meaningful repair budget in an older home.
Attic, crawl space, and the hidden areas
The attic tells an inspector a great deal. Beyond insulation depth, it reveals roof leaks from underneath, signs of inadequate ventilation, exposed or improper wiring, and whether bathroom fans vent outside or simply dump moist air into the attic, a common cause of condensation and mold.
Crawl spaces are equally informative and often neglected by owners. An inspector checks for standing water, a proper vapor barrier over exposed soil, rot in floor framing, pest evidence, and the condition of any ductwork or plumbing routed through the space. These are areas homeowners rarely see, so the inspection often surfaces problems no one knew existed.
Access governs how much the inspector can report. A blocked attic hatch or a crawl space too tight to enter limits the evaluation, and the report notes those constraints. Clearing access before the inspection turns a partial assessment into a complete one.
Exterior grounds and drainage
Beyond the building itself, inspectors assess the grounds for conditions that affect the structure. Grading that slopes toward the foundation, downspouts that discharge at the base of the walls, and low spots that pool water all push moisture toward the home, where it becomes a basement or crawl-space problem.
Walkways, driveways, retaining walls, decks, and porches get a safety-focused look. Loose railings, rotted deck framing, and trip hazards appear in reports because they pose injury risk, not just cosmetic concern. Attached structures like decks receive particular attention since failures there can be dangerous.
Vegetation matters too. Trees overhanging the roof, roots near the foundation, and shrubs holding moisture against siding all get noted, because landscaping is a frequent and easily overlooked contributor to building deterioration.
What inspectors deliberately skip
Inspectors do not move furniture, open walls, or operate systems that could be damaged. They will not turn on utilities that are shut off, and they cannot evaluate anything buried or sealed. Cosmetic preferences, future predictions, and code compliance certification fall outside the job.
This is why the report repeatedly notes areas as “not inspected” or “recommend further evaluation.” Those phrases are honest limits, not evasions, and they point buyers toward the right specialist.
Understanding these limits prevents disappointment. A buyer who expects the general inspection to certify the sewer line, clear the home of radon, or guarantee the furnace through next winter has misread the service. The inspection narrows uncertainty; it does not erase it.
How inspectors document what they find
Modern inspectors record findings as they work, photographing each defect and capturing notes that become the report. The photograph is the anchor: a captioned image of a corroded valve, a stained ceiling, or a double-tapped breaker lets a buyer see exactly what the inspector saw, without relying on memory or interpretation.
Good documentation also protects everyone involved. A clear photo and a precise location note prevent disputes later about whether a defect existed at the time of inspection. For buyers, that means the report holds up as evidence during negotiation; for the inspector, it limits liability for conditions outside the scope.
The best reports go beyond cataloging problems. They explain why a finding matters, rate its urgency, and recommend a next step, whether that is monitoring, repair, or evaluation by a licensed specialist. That context is what turns a list of observations into a tool a buyer can actually act on.
Turning the checklist into action
Once buyers know what inspectors look for, the report becomes a map. Group findings by safety, major systems, and routine maintenance, then decide which items justify a repair request or a follow-up evaluation. The inspector’s referrals are the next steps, not optional extras.
Attending the inspection makes the checklist tangible. Watching each system get tested turns a long PDF into a working knowledge of the home buyers are about to own. The questions raised on site often prove more valuable than the written report itself.
How findings vary by home age
What inspectors emphasize shifts with a home’s age. In newer construction, the focus often lands on workmanship: improper flashing, missed connections, grading that was never finished, and systems installed but not fully commissioned. New homes are not automatically defect-free, which is why phased and warranty inspections exist.
Older homes bring a different set of concerns. Aging electrical panels, outdated wiring, original plumbing nearing the end of its life, and, in pre-1978 housing, the possibility of lead paint or asbestos all weigh more heavily. An inspector reading a 1950s home knows to look for the era’s characteristic materials and to recommend the right specialty testing.
Buyers benefit from understanding this lens. A long list of findings on a hundred-year-old house is normal and expected, while the same list on a five-year-old home would raise harder questions about construction quality. Context, again, is what makes the checklist meaningful.
Renovated and flipped homes deserve extra scrutiny. Fresh paint and new finishes can hide hasty work behind the walls, so inspectors look for clues that updates were cosmetic rather than thorough, such as new fixtures connected to old supply lines or a remodeled kitchen with undersized electrical. A pretty surface is not proof of sound systems underneath.
References
- Standards of Practice Checklist — InterNACHI
- Standard of Practice — ASHI
- Radon Basics for Homeowners — EPA
- Healthy Housing Inspection Topics — CDC