Home Inspection Explained: What Buyers Need to Know
What a home inspection is (and isn't)
A home inspection is a visual examination of a home's accessible and visible components — roof to foundation — conducted by a licensed inspector following ASHI (American Society of Home Inspectors) or InterNACHI standards. The inspection takes 2–4 hours and produces a written report documenting the condition of every major system in the home.
The inspection is a buyer protection, not a seller's disclosure. Sellers are not present, and in most states, sellers are not required to provide access to components they've deliberately concealed. What the inspector can assess is limited to what is visible, accessible, and safe to examine on the day of the inspection.
Not an appraisal
An appraisal assesses market value. An inspection assesses physical condition. Your lender orders the appraisal; you order the inspection.
Not a warranty
An inspection report documents condition on a specific day. It does not guarantee the home will function perfectly after closing.
Not a code compliance review
Inspectors note visible code violations but don't perform a code survey. Municipal inspections during construction serve that function.
Not invasive
Inspectors don't open walls, move furniture, or operate equipment outside normal conditions. Hidden defects exist — inspections surface visible evidence.
Most standard inspections cost $300–$600. For a purchase in the hundreds of thousands, this is one of the lowest-cost protections available.
What inspectors examine
Inspectors systematically assess every accessible system and component from the roof to the foundation. Use the explorer below to see what they check in each area. Specialty items — sewer lines, radon levels, chimney flue interiors — require separate specialty inspections covered later in this guide.
Finding the right inspector
The most important thing: do not use the listing agent's referral. Listing agents have an incentive to see the transaction close. The inspector's interests must be aligned with yours alone.
ASHI or InterNACHI certification
These credentials require training, testing, continuing education, and adherence to a published Standards of Practice.
State licensing (where required)
~40 states license home inspectors. Verify your inspector is licensed in your state before hiring.
E&O insurance
Errors and omissions insurance is your recourse if the inspector misses a significant defect.
Sample report
Request a sample before hiring. A good report is detailed, system-by-system, and includes photos. Avoid vague one-page summaries.
Experience with the home type
An inspector experienced with 1970s ranch homes may need supplementation for a 1920s Victorian or a new construction slab-on-grade.
Buyer references (not agent referrals)
Ask former buyer clients, not agents who've worked with them. Buyers who found significant issues and felt well-served are the right reference.
Preparing for inspection day
Once the inspection is scheduled, confirm with your agent that the seller will leave utilities on (gas, electric, water). An inspection without functional utilities is incomplete. If the seller turns off the HVAC or water heater before inspection, you may request the inspection be rescheduled.
Review any notes from your showings — a sticky door, a ceiling stain, a sound from the HVAC. Tell your inspector at the start. Experienced inspectors appreciate buyer observations and will give those areas extra attention.
If the home is in a high-radon area or is 20+ years old, consider scheduling a radon test and sewer scope at the same time as your general inspection. They run concurrently and add no extra scheduling complexity.
During the inspection
Be present for the full inspection. Do not wait in your car and review a report later — what inspectors say verbally as they examine systems often provides critical context that doesn't fully survive translation into a written report.
Walk through every area with the inspector. Ask when they flag something: "How serious is this?" and "What would you do if this were your house?" Experienced inspectors give measured but honest assessments when asked directly.
At the end of the inspection, ask: "Is there anything about this home that concerns you in a significant way?" Some inspectors are conservative about what they document but will speak plainly when asked directly.
Reading the inspection report
Inspection reports range from 30 to 100+ pages depending on the inspector and home. Most organize findings by system with photos and condition ratings.
Read the full report, not just the summary. The executive summary is a convenience — the detail section is where the meaningful information lives. A summary that reads "HVAC: functional" and a detail section that reads "furnace is 23 years old, past expected service life, recommend replacement" tell very different stories.
Look for the inspector's condition codes: Satisfactory / Marginal / Defective / Safety Concern. Understand what each code means before reading individual findings.
Note the difference between "monitor this crack" and "this crack requires structural engineer evaluation" — these communicate very different urgencies.
Classifying defects
Before negotiating, categorize every finding. The category determines the appropriate response. Most reports contain a mix of all three tiers — context matters more than count.
An immediate risk of injury, fire, or structural failure. These must be addressed before closing — or may affect insurability.
Significant systems or structural issues that are expensive to address but not immediately dangerous.
Normal wear and deferred maintenance expected in any lived-in home. These inform your ownership plan but typically don't justify renegotiation.
Responding to findings
You have four options after reviewing an inspection report. Which you choose depends on the severity of findings, market conditions, your contingency period, and your own risk tolerance. Your response must be submitted within your inspection contingency period.
Specialty inspections
General inspections cover what is visible and accessible. Several important property conditions require dedicated specialty inspections. Don't wait until after the general inspection to decide — schedule promptly so you don't run out of contingency time.
Recommended for any home 20+ years old. A camera run through the drain line reveals root intrusion, deteriorating clay pipe, bellied sections, or blockages. Replacing a sewer line costs $4,000–$15,000+.
Required or strongly recommended in high-radon areas (EPA Zone 1–2). Radon is the second leading cause of lung cancer. Mitigation systems cost $800–$2,500 if levels exceed 4 pCi/L.
When the general inspection notes visible mold, musty odors, or moisture issues in the attic, basement, or crawlspace. Air sampling identifies species and concentration.
When the general inspector flags the chimney, when a woodburning fireplace is present, or when the home has been vacant. Level 2 uses a camera to inspect the flue lining.
When the inspector notes concerns about the age, function, or heat exchanger of the HVAC system. A specialist can perform combustion analysis and check refrigerant charge.
Often required by lenders in warm-weather states. Identifies wood-destroying organisms — termites, carpenter ants, wood-boring beetles — and wood damage.
When the property has a pool or spa. Covers equipment, safety features, shell condition, and fencing compliance.
When the inspector notes concerning cracks, soil movement, or structural modifications that warrant a licensed structural engineer's opinion.
The inspection contingency
An inspection contingency is a clause in your purchase offer that gives you the right to have the property inspected and — if findings are unsatisfactory — to negotiate or cancel the contract within a defined period. Contingency periods are typically 5–14 days from contract acceptance.
Three things to confirm about your inspection contingency
- What triggers it — most contingencies require a written notice of unsatisfactory condition, not just a verbal conversation.
- What it covers — some are written as "inspection contingency," others as "physical condition contingency." Understand the exact scope.
- What happens to earnest money — if you cancel within the contingency period citing inspection findings, confirm your earnest money is fully refundable.
Do not let the contingency expire without taking action. Ask for an extension before the deadline if you need more time for specialty inspections — sellers typically grant reasonable requests.
Should you waive inspection?
In competitive markets, buyers sometimes waive inspection contingencies to make offers more attractive. This is one of the highest-risk decisions in a home purchase.
Waiving inspection doesn't make problems disappear — it makes them your problem the moment you close. A home with a failed heat exchanger, galvanized plumbing, or deteriorating sewer line costs the same to fix whether or not you knew about it at closing. You just lose the ability to negotiate.
A better alternative
A pre-offer inspection lets you commission an inspection before submitting an offer. You can then write a cleaner offer without an inspection contingency — or with a shortened one — because you already know the condition. Pre-offer inspections cost the same but are not refundable if the offer isn't accepted. They are far less risky than waiving inspection outright.
Buyer checklist
Use this checklist to stay organized through the inspection process.
Frequently asked questions
Is a home inspection the same as an appraisal?
No. An appraisal is ordered by your lender to confirm the home's market value supports the loan amount. It is not a physical condition assessment. A home inspection is ordered by the buyer to evaluate the physical condition of the property. You need both — they serve completely different purposes.
How long does a home inspection take?
A home inspection typically takes 2 to 4 hours for an average single-family home. Larger homes, older homes, or homes with more complex systems take longer. You should plan to be present for the full inspection.
How much does a home inspection cost?
Home inspections typically cost between $300 and $600 for a standard single-family home. Specialty inspections (sewer scope, radon, mold, chimney) are additional.
What if the seller refuses to make any repairs?
Sellers are not legally required to repair anything revealed in an inspection — even safety hazards in most states. You can respond by negotiating a price reduction or credit, accepting the home as-is, or canceling within your contingency. A seller who refuses to negotiate on a genuinely major defect is a useful signal about the transaction.
When is a pre-offer inspection appropriate?
In competitive markets, some buyers commission a pre-offer inspection before submitting an offer. This lets you write a cleaner offer without an inspection contingency because you already know the condition. Pre-offer inspections cost the same but are not refundable if the offer isn't accepted.
Does a newly built home need an inspection?
Yes. New construction should be inspected by a qualified independent inspector before closing — not just by the builder's own quality team. Municipal inspections verify code compliance, not overall quality. Common new construction issues include improperly installed HVAC, inadequate insulation, and grading problems.
What isn't covered by a standard home inspection?
Standard home inspections do not cover: underground sewer lines (sewer scope), radon levels (radon test), mold air quality (mold inspection), pest infestation (pest inspection), chimney flue lining (Level 2 chimney inspection), or swimming pool equipment. They also don't assess the cost to remediate findings — you need contractor estimates for that.