What Home Inspections Reveal and Why They Matter for Buyers

You get the report on a Tuesday evening. Eleven pages, forty-one photos, and a line on page six that says the rear foundation wall has a horizontal crack running about four feet, with efflorescence along the base. You read it three times. Then you call me, because I've been through this a few hundred times and I still get that same knot in my stomach when I see the word efflorescence in a client's report.

Here's what I tell them: a home inspection is not a pass/fail exam. It's a snapshot. It's roughly four hours of a licensed generalist walking around a property, running taps, flipping breakers, poking at joists, and writing down everything questionable he can reach with his eyes and his flashlight. That's it. What it reveals matters enormously — but so does what it can't reveal, and almost nobody talks about that second part.

What home inspections reveal and why they matter

I bought a 1962 ranch house about eight years ago. The inspection report flagged "minor settling crack at northeast foundation corner, monitor." I monitored it. Two winters later, water was pooling in the basement after every thaw. The crack had been minor. The drainage problem feeding it was not, and no inspector on earth could have seen that without digging.

That's the honest version of what an inspection does. It surfaces evidence. It doesn't diagnose cause with certainty, and it never predicts the future.

What a standard inspection actually covers

A typical single-family inspection runs two to four hours and touches the major systems:

• Structure — foundation, framing visible in the attic and basement, floor and wall movement
• Roof — covering material, flashings, gutters, and whatever the inspector can see from the eaves or a drone
• Electrical — panel condition, breaker types, grounding, visible wiring, GFCI outlets
• Plumbing — supply lines, drain function, water heater age and venting
• HVAC — furnace and AC operation, age, and condition of the visible components
• Insulation and ventilation — attic depth, vapor barriers, bathroom and kitchen exhaust
• Signs of moisture, pest activity, and previous repairs done poorly

Notice what's missing from that list: anything that requires cutting, drilling, or disassembling. An inspector who pulls a panel cover to look at the panel interior is already at the outer edge of what the job permits.

How the report becomes a negotiation document

Most buyers treat the report as a list of grievances. That's a mistake. It's a list of dollar amounts, and once you price each item, you can decide which ones are worth fighting over.

I've watched buyers walk away over a $900 repair and I've watched buyers close on a house with a $14,000 roof replacement pending, because they got $11,000 off the price and knew a local roofer who'd do it in a week. The second couple made the better decision. Not because the roof was fine — it wasn't — but because they understood the number.

A realtor friend of mine, Sarah, keeps a running spreadsheet of findings from her last two hundred closings. Nearly every house had at least one item that could be called major. Nearly every one of those got resolved through price adjustment, seller credit, or a contractor's estimate handed back to the seller.

What is the biggest red flag in a home inspection?

Water. Every single time, the answer is water — where it's coming from, where it's going, and what it's already ruined.

I don't care how pretty the kitchen is. If I see staining on the basement wall, a soft spot in the subfloor near a bathroom, or a musty smell the seller has disguised with plug-in air fresheners (and yes, that happens constantly), everything else in the house becomes secondary. Moisture is the one problem that compounds silently. A foundation crack is a crack. A moisture problem is a crack, plus rot, plus mold, plus whatever the next owner's respiratory system decides to do about it.

The second-tier red flags, in the order I'd rank them:

1. Structural movement that's still active — stair-step cracks in brick, doors that don't latch, floors that slope more than an inch over twenty feet.
2. Aluminum branch wiring in houses built roughly between 1965 and 1973. Insurers hate it, and rewiring is expensive.
3. Federal Pacific or Zinsco electrical panels — these have a documented history of failing to trip. Some insurers refuse to write policies on homes with them.
4. Active termite or carpenter ant damage, especially if the seller claims no knowledge.

And here's a red flag that isn't in the house at all: a seller who won't allow the inspection, or who insists on being present for the whole thing. That's not a technical finding. It's a behavior. It tells you something.

What are the most common findings in a home inspection?

Boring stuff. That's the truth nobody puts in a headline.

Across the inspections I've either attended or reviewed reports from, the repeat offenders are almost always small:

• Missing or improperly installed GFCI outlets in kitchens, bathrooms, and garages
• Clogged or improperly routed dryer vents
• Downspouts discharging directly against the foundation
• Water heater missing a discharge pipe or a proper drain pan
• Cracked or missing roof flashing around chimneys and vents
• Inadequate attic ventilation leading to condensation
• Deck ledger boards attached with nails instead of lag bolts or structural screws
• Windows with failed thermal seals — foggy glass that no longer insulates

None of those will kill a deal on their own. Combined, they can run into a few thousand dollars, and buyers who panic over a list of ten minor items usually regret it six months later when they realize they'd have fixed the same things regardless.

Why the same problems keep showing up

Because maintenance is deferred almost universally. Homeowners replace what breaks and ignore what works, even when "works" means "has maybe two years left." A water heater from 2011 is a water heater that's already past its expected service life, and its presence on the report is not a defect — it's a countdown.

I once flagged a 22-year-old furnace for a client and told her to budget for replacement. She negotiated a $2,500 credit. The furnace died fourteen months later. The credit covered about half the new unit. She was fine with it. That's the whole point of the report: you're buying information, and information lets you plan.

What's the worst thing a home inspector can find?

Foundation failure that requires underpinning. That's the one that ends conversations.

I've seen it twice. Both times, the estimate came back north of $25,000, and both times the buyers walked. Not because the sellers wouldn't negotiate — because the scope of the work was unpredictable. Underpinning a foundation is not a fixed-price job. You dig, you find out what's actually wrong, and then you pay for that.

Second place goes to widespread mold colonization inside wall cavities. It's invisible, it's expensive to remediate properly, and it's almost always a symptom of something worse upstream. A remediation contractor will quote you for the visible damage and then find more once the drywall comes down.

Third — and this one surprises people — is a house that's been flipped with unpermitted work. I looked at a property where a previous owner had converted a garage into a bedroom. No permit, no proper egress window, no HVAC extension. Ten thousand dollars of "renovation" that had to be undone, and the appraisal wouldn't count the extra room as living space. The buyers' lender flagged it before closing.

Finding	Typical repair range	Deal impact
Roof replacement	$6,000–$18,000	Commonly negotiated as seller credit
Foundation underpinning	$15,000–$40,000+	Frequently kills the sale
Mold remediation (wall cavities)	$4,000–$15,000	Depends on scope discovery
Full rewire (aluminum)	$8,000–$20,000	Insurer may refuse to bind
HVAC replacement	$5,000–$12,000	Usually a credit, rarely a walk-away
Minor electrical and plumbing	$300–$1,500 total	Buyers fix it themselves

What decreases property value the most?

Not what most people guess. A dated kitchen is cosmetic and the market prices it in. Buyers see orange oak cabinets and deduct mentally before they even make an offer.

What actually destroys value are the things that can't be seen or can't be fixed cheaply:

1. Foundation defects — the single largest value hit, because lenders and insurers both care, and remediation costs are open-ended.
2. Water intrusion history — even after repair, a documented basement flood follows the property. It shows up in disclosure statements for as long as anyone keeps records.
3. Unpermitted additions — the square footage doesn't count toward appraisal comparison, so you're paying for space the market won't finance.
4. Environmental issues — asbestos in older heating systems, buried oil tanks, radon above the action level. Each one triggers a specific remediation protocol and a specific cost.
5. Deferred maintenance that's visible from the street — peeling paint, sagging gutters, overgrown lots. These signal "nobody's been taking care of this," and buyers price in a discount larger than the actual repair cost.

The asymmetry is worth internalizing: a $6,000 roof problem might cost you $6,000. A foundation problem might cost you $6,000, or it might cost you the buyer entirely, along with the next three months of your life.

When should you schedule the inspection?

Within the inspection contingency window, which is usually five to ten days after your offer is accepted. That window is contractual — miss it and you lose your right to walk away or renegotiate based on findings. I've watched buyers delay because the seller's schedule was inconvenient, and it cost them their leverage entirely.

Bring a contractor if you can. An inspector documents; a contractor prices. Having both in the same room turns a vague report into an actionable list.

Is a home inspection required for an FHA loan?

No. FHA requires an appraisal, and that appraisal includes a health and safety review — peeling paint, missing handrails, exposed wiring. But it is not a home inspection, and the appraiser is working for the lender, not for you. Don't confuse the two. I've seen buyers skip a real inspection because "the FHA appraisal passed," then discover a failing sewer line three weeks after closing. The appraisal was never designed to catch that.

Who pays? You do. The buyer typically covers the inspection fee, somewhere between $300 and $600 for a standard single-family home. It's the cheapest insurance policy you'll ever buy, and it's fully refundable in the sense that it will save you from a mistake that costs twenty times more.

What inspections can't tell you

This is the part I wish more buyers understood before they read the report.

An inspector cannot see inside your sewer line without a camera. He cannot test the well or the septic system unless you pay separately for those. He cannot tell you whether the roof will leak next spring, only that the flashing looks worn. He cannot see behind the drywall, under the basement slab, or behind the insulation in the crawlspace. He cannot assess a foundation drain that's buried six feet down. And he cannot predict what the next hard freeze will do to a pipe that's currently fine.

So when a report comes back clean, that means "no visible defects at the time of inspection." It does not mean "problem-free house." It means you bought a snapshot, and snapshots are only as good as their moment.

What to do with that uncertainty

Get specialized inspections when the property warrants them. A sewer scope on any house over thirty years old. A well and septic evaluation if you're outside municipal service. A radon test — cheap, fast, and the result is either actionable or it isn't. A structural engineer if the foundation section of the report contains more than two items.

That's the real value of the standard inspection. It's not the final word. It's the map that tells you which specialists to call.

Which is why I still read every report carefully, even after all these years — not for the big scary item at the top, but for the three small notes buried in the middle that nobody's going to argue about, and that will cost you two weekends and four hundred dollars to fix once you own the place. Those are the honest ones. Those are the ones that tell you what living there will actually be like.