I have sat through more home inspections than I can count. Some took two hours. One took almost five, because the inspector kept finding one thing after another under an old farmhouse.
I’m really good at spotting problems in a house before the inspector even says a word.
I want to walk you through what red flags actually look like in real life, what they usually cost to fix, and how to tell the difference between something ugly and something dangerous.
What a Home Inspection Report Actually Tells You
A home inspection report is a written summary from a certified home inspector, describing the condition of the house on the day they walked through it. It covers the roof, foundation, plumbing, electrical, HVAC, and more.
Here is something people do not expect. The report itself is not the most useful part. The most useful part is standing there next to the inspector while they work.
I always tell my clients the same thing. Go to the inspection. Do not just wait for the PDF later. A report can describe a crack. It cannot show you the inspector’s face when they find it.
Reading the Inspector’s Body Language
This sounds strange, but it is one of the most honest tools you have.
A good inspector stays calm most of the time. Houses have flaws. That is normal. But watch for the moment they go quiet, get down low with a flashlight, and take five or six photos of the same spot instead of one.
That pause means something caught their attention. It might be nothing serious. But it is worth asking right then, “What are you looking at?” Do not wait for the report. Ask while they are still standing there, because in the moment, they will often give you an honest, plain answer before they switch into formal report language.
I once watched an inspector go quiet in a crawl space for almost ten minutes. He came out and just said, “We need to talk about your foundation.” That sentence, in person, told me more than any paragraph in the report later did.
Foundation Issues: The Big One
Foundation issues scare buyers more than almost anything else, and honestly, they should get your attention. But not every crack means disaster.
Here is how I tell the difference on a walkthrough.
Cosmetic cracks are usually thin, straight up and down, and under a quarter inch wide. These happen from normal settling. Almost every house has a few somewhere.
Structural cracks are wider, run diagonally, or look like stair steps along the mortar joints in a brick foundation. If a door frame near the crack does not close right, or the floor near it feels uneven under your feet, that is not just cosmetic anymore.
One trick I use with my camera eye: stand at one end of a long hallway or basement wall and look down the length of it, almost like you are lining up a photo. A wavy or bulging wall becomes obvious this way, even when it is hard to see standing close up.
Foundation repairs range wildly. A few cracks sealed with epoxy might run a few hundred dollars. Actual structural underpinning can run into the tens of thousands. This is exactly why an inspection contingency in your contract matters so much. It gives you the right to negotiate or walk away if something serious turns up.
Water Damage: The Quiet Destroyer
Water damage is sneaky. It rarely announces itself. It hides behind paint, under sinks, and inside walls.
Here is a trick from my photography days that works surprisingly well for spotting it. Shine a flashlight across a wall or ceiling at a low angle, almost sideways instead of straight on. Side lighting shows bumps, ripples, and old stains that regular overhead light hides completely. Photographers use this to catch texture. Inspectors use it too, whether they call it that or not.
Also trust your nose. A musty smell in a basement or crawl space usually means moisture is present, even if you cannot see it anywhere on the walls.
Common spots I always ask the inspector to check twice:
- Under every sink, feeling for soft or swollen wood
- Around the water heater base
- Ceiling corners near bathrooms directly above
- Window sills, especially on older homes
Fresh paint patches on just one section of a wall are worth asking about too. Sometimes that is just normal touch-up. Sometimes it is a seller covering up a stain instead of fixing what caused it.
The Electrical Panel: Small Box, Big Problem
Most buyers walk right past the electrical panel. I never do, and neither should you.
Two specific things make me stop and ask questions every time.
A Federal Pacific panel. These were installed in a lot of homes built between the 1950s and 1980s. The breakers in these panels have a known history of failing to trip during an overload, which is a real fire risk. If your inspector points one out, do not treat it as a minor note. Ask for a licensed electrician’s opinion before you move forward.
Knob and tube wiring. This is an old wiring style, easy to spot once you know what it looks like: ceramic knobs holding separate wires apart, with fabric-like insulation. It was common before the 1950s. It is not automatically dangerous, but many insurance companies will not cover a home that still has it, and that alone can complicate your closing.
A panel replacement usually runs a few thousand dollars. Rewiring an entire older home for knob and tube costs quite a bit more, since it often means opening up walls.
Roof Leaks and What Hides Underneath
A roof that looks fine from the ground can still be hiding damage. I always ask the inspector to check the attic, not just the shingles from outside.
Inside the attic, look for dark staining on the wood, or wood that feels soft when you press on it gently. Daylight coming through anywhere it should not is an obvious one, but it is rarer than you would think.
A missing shingle or two is usually a simple, cheap fix. Soft, dark plywood in the attic means water has been getting in for a while, and that is a different conversation entirely.
Crawl Spaces: What Nobody Wants to Look At
I will be honest. Crawl spaces are the worst part of any inspection to actually watch. They are dark, tight, and usually a little unpleasant.
But they tell you more truth than almost any other part of the house.
This is where I have seen dry rot on floor joists, standing water after a rainy week, and sagging insulation hanging down like it gave up. If your inspector spends real time down there, let them. This is not a place to rush through just to get back to the kitchen tour.
Ask specifically about ventilation too. A crawl space with poor airflow traps moisture, and trapped moisture eventually leads to the exact wood rot and mold problems that get expensive fast.
Termite Damage and Dry Rot
These two get confused a lot, but they are different problems with different signs.
Termite damage often shows as small pencil-thin mud tubes running along foundation walls or support posts. Wood damaged by termites tends to look hollowed out, sometimes almost honeycombed on the inside, even though the surface looks fine.
Dry rot comes from fungus, not insects, and usually shows up in wood that has had ongoing moisture exposure. It looks crumbly, dry, and cracked in a checkerboard pattern.
Here is a simple test inspectors use, and you can do it too. Gently press a screwdriver into suspect wood. If it sinks in easily with almost no resistance, something has weakened that wood, whether it is rot or pests. That spot deserves a closer look, and possibly a pest control specialist’s opinion.
The Sewer Scope: Worth Every Penny
A sewer scope is not always included in a standard home inspection, and I always recommend adding it separately, especially for older homes.
This is a small camera sent through the main sewer line, checking for cracks, roots growing into the pipe, or collapsed sections. None of this shows up on a regular walkthrough. You genuinely cannot see it any other way.
I have seen buyers save themselves from a nasty surprise more than once with this simple add-on. A damaged sewer line can cost thousands to repair, especially if it means digging up part of the yard or a driveway.
Cosmetic Fix or Structural Failure? A Simple Way to Tell
Buyers ask me this constantly, so here is my honest, simple rule of thumb.
Cosmetic problems are things that affect how something looks, not how it functions. A cosmetic issue does not get worse on its own if you leave it alone for another year.
Structural or functional problems affect how the house actually works, and they tend to get worse the longer you wait. A hairline crack in old paint is cosmetic. A door that suddenly will not close because the frame shifted is not.
When in doubt, ask your inspector this exact question: “If I do nothing about this for one year, what happens?” Their answer usually makes the difference obvious right away.
Your Quick Reference Checklist
Before you walk into any inspection, keep this list in your back pocket.
- Ask to attend the inspection in person, not just read the report later
- Watch the inspector’s body language, and ask questions in the moment
- Check the electrical panel yourself for a Federal Pacific label
- Ask about knob and tube wiring in any home built before the 1960s
- Shine a flashlight sideways across walls and ceilings to check for water stains
- Ask the inspector to walk the attic, not just check it from the ladder
- Do not skip the crawl space, even though nobody enjoys it
- Add a sewer scope for homes older than 20 years
- Press a screwdriver gently into any suspicious wood
- Ask “what happens if I ignore this for a year” for anything that worries you
- Keep your inspection contingency in place until you are fully satisfied
Final Thoughts
A home inspection is not about finding a perfect house. Perfect houses do not really exist. It is about understanding exactly what you are buying, so nothing surprises you six months after you move in.
Trust your inspector, but also trust your own eyes. Ask questions in the moment. Look closely, the way you would look through a camera lens searching for the one detail everyone else missed.
That habit alone has saved my clients real money, more times than I can count.