What Actually Happens During a Home Inspection
A walkthrough of what an inspector checks, how long it takes, and what the report will and won't tell you.
What's inside 6 sections
Quick answer: A home inspector spends 2 to 4 hours doing a visual, non-invasive check of the home's major systems — roof, foundation, electrical, plumbing, HVAC — and hands you a written report of what they found. It's not a guarantee nothing's wrong; it's a snapshot of the visible, accessible condition of the house on that one day.
I've walked more inspections than I can count, standing next to the inspector as the homeowner or the buyer's agent asks the same questions every time. What is he actually doing up there on the roof? What's he looking for in the attic? Is that thing he's tapping on the wall actually going to tell him something? Here's what's actually happening, room by room.
The Exterior and Roof Come First
Most inspectors start outside, working the perimeter of the house before they ever walk in the front door. They're checking grading and drainage around the foundation, the condition of siding and trim, visible foundation cracks, and the state of the driveway and any exterior structures. Then they'll get up on the roof, or use a ladder and binoculars if the pitch or access doesn't allow safe walking, checking shingle condition, flashing around chimneys and vents, and gutter attachment.
This part matters more than people expect, because roof and drainage issues are some of the most expensive things to fix later and some of the easiest to miss from the ground. A slight negative grade toward the foundation that looks like nothing to an untrained eye is exactly the kind of thing that causes a wet basement three years down the line. See HUD's guide to FHA loan programs for the source data behind this.
Inside: Electrical, Plumbing, and the Panel
Inside, the inspector opens the electrical panel and checks for proper labeling, signs of overheating or improper wiring, and whether the panel's capacity matches the home's actual electrical load. They'll test a sample of outlets throughout the house — GFCI outlets in bathrooms and kitchens get specific attention since those are a code and safety item — and check for functioning smoke and carbon monoxide detectors.
On plumbing, they run every faucet and flush every toilet, checking water pressure, drainage speed, and looking for active leaks under sinks and around fixtures. They'll also check the water heater's age, condition, and any obvious signs of the issues that show up in an aging unit — the same rust and pooling water signs worth watching for on any water heater, inspection or not. This connects with signs you're not ready to buy yet, worth reading if you're weighing that angle too.
| Area Checked | What They're Looking For |
|---|---|
| Roof | Shingle condition, flashing, gutter attachment |
| Foundation | Visible cracks, grading, drainage away from house |
| Electrical | Panel condition, outlet function, detector presence |
| Plumbing | Water pressure, leaks, water heater condition |
| HVAC | Age, function, basic performance test |
HVAC, Attic, and Crawl Space
The inspector will run the HVAC system through a basic function test — heat and AC both, if the season allows it — and note the age and apparent condition of the unit. In the attic, they're checking insulation levels, ventilation, and looking for any signs of roof leaks from the underside, which often show up before they're visible from outside. Crawl spaces get checked for moisture, pest evidence, and the condition of any exposed plumbing or ductwork. For the government's own guidance on this specifically, see the CFPB's Owning a Home hub.
An inspector who won't go into the crawl space or attic because it's "too tight" or "too hot" isn't doing the job fully. Those are exactly the spots where the most expensive surprises tend to hide.
What the Report Won't Tell You
A standard inspection is visual and non-invasive by design — the inspector isn't cutting open walls, moving insulation to check every stud bay, or dismantling the HVAC system to look inside it. That means a clean report tells you there's nothing visibly wrong on that day, not that there's nothing wrong at all. Things like pest damage, radon levels, sewer line condition, and mold behind a wall need their own specialized inspections if you want that specific coverage — ask your agent or inspector about adding them if the house's age or location makes any of those a real concern.
Read the full report, not just the summary page. The summary usually highlights the big-ticket items, but a pattern of small issues scattered through the full report can tell you just as much about how the house was maintained over the years.
What to Actually Do With the Findings
Once you have the report, separate the findings into three rough categories: safety issues that need attention regardless of anything else, big-ticket items that affect your negotiating position or your budget planning, and minor cosmetic notes that are useful to know but not worth spending negotiating capital on. A cracked outlet cover and a failing roof don't belong in the same urgency bucket, even though they might both show up as line items on the same report.
If the inspection turns up something significant, you generally have a few paths depending on your contract's specific inspection contingency terms: ask the seller to make repairs before closing, negotiate a credit or price reduction to cover the cost yourself, or in some cases walk away from the deal entirely if the issue is serious enough. Which path makes sense depends on the specific issue, your market's competitiveness, and how attached you are to the house — there's no single right answer, but knowing your options before you're in the middle of a tense negotiation helps you respond calmly instead of reactively. If this is part of your situation, DIY repairs vs. calling a pro is worth reading alongside it.
Bringing In a Specialist When the General Inspector Flags Something
If your general inspector notes something outside their scope or expertise — a foundation crack that might be structural, evidence of an old roof leak that needs a roofer's closer look, an HVAC system that's clearly struggling — it's worth bringing in a specialist for a more targeted second opinion before you finalize your decision. This costs more time and money upfront, but it's far cheaper than discovering after closing that a "minor crack" the general inspector flagged was actually a real structural issue that a foundation specialist would have caught immediately.
A good inspector will often tell you directly when something's worth a specialist's second look rather than guessing at the severity themselves — take that recommendation seriously rather than treating it as an inspector just trying to pad the process with more fees.
Keep the full report even after closing, not just during the negotiation window. It becomes a genuinely useful baseline document for your first few years of ownership — a record of exactly what condition the roof, HVAC, and major systems were in when you moved in, which is handy both for your own maintenance planning and, down the line, if you ever need to show a future buyer how the home's condition has changed or been maintained since your own purchase. We go deeper on winterizing your home before the first freeze in a separate guide, worth a look if it's relevant here.
