What does a home inspector do? Checklist, costs, and limits

Buying or selling property is a major milestone, and a professional home inspection is your essential reality check before signing. So, what does a home inspector do? They perform an objective, noninvasive visual evaluation of a property’s structure and core mechanical systems.

Understanding what a home inspector looks for when buying a house helps you spot common red flags home inspectors report and avoid major things that fail a home inspection. Knowing how much a home inspection costs, who pays for the home inspection, and how long a home inspection takes prepares you to use your inspection report and home inspection contingency to negotiate repairs or credits before closing.

Key takeaways:

• Visual assessment: Inspectors evaluate accessible structural, mechanical, and electrical systems for safety hazards and active defects.
• Defined limits: Standard evaluations exclude hidden areas, code compliance, valuations, and specialized tests (pools, septic, mold, radon).
• Negotiation leverage: Reports empower buyers to request repairs, negotiate seller credits, or exit safely using an inspection contingency.

What is a home inspector?

A home inspector is an objective, third-party professional hired to perform a thorough, noninvasive visual evaluation of a property’s physical structure and core mechanical components including the roof, foundation, plumbing, electrical system, and HVAC. Rather than determining market value, certifying municipal code compliance, or opening up walls, their job is to document overall operational health, safety hazards, and needed repairs in an actionable home inspection report.

Understanding this distinction is key when comparing a home inspection vs. home appraisal: While an appraiser determines fair market value for a lender, a home inspector assesses physical safety and condition, giving buyers and sellers the practical clarity needed to make informed real estate decisions.

How does a home inspection work?

After signing a purchase agreement, the buyer schedules an on-site home inspection to evaluate core structures and systems. Buyers should attend the final walk-through to review safety concerns and shut-off valves in person. Shortly after, the inspector delivers a digital inspection report detailing defects, safety hazards, and maintenance needs for negotiations.

When should you get a home inspection?

For home buyers, the home inspection usually takes place immediately after an offer is accepted, during the time frame specified by the purchase agreement's inspection contingency. This period typically spans 7 – 10 calendar days. Home sellers can also opt for a pre-listing inspection before placing their property on the market to fix hidden issues in advance and avoid deal-breaking surprises during buyer negotiations.

How long does a home inspection take?

A standard home inspection generally takes 2 – 4 hours to complete. The total time depends heavily on the square footage of the residence, the age of the structure, the accessibility of spaces like attics and crawl spaces, and the overall condition of the property. Larger, historic homes with multiple HVAC units or complex additions naturally require more time for a comprehensive review.

Who pays for the home inspection?

In standard home purchase transactions, the home buyer schedules and pays for the home inspection out of pocket at the time of service. Home inspection costs typically range from $343, with most homeowners paying between $296 and $424, for an average-sized single-family home (though pricing varies by geographic region and home size). If a seller orders a prelisting inspection, the seller assumes that cost directly.

What does a home inspector look for?

During an inspection, the inspector follows a standardized home inspection checklist, examining thousands of structural and operational details across the property. Their primary goal is to ensure the major components of the home operate safely and as intended.

Foundation and structural integrity

The inspector examines visible foundational elements, including concrete slabs, basement walls, support beams, joists, and crawl space posts. They search for foundation issues in the form of structural shifting or instability, such as major foundation cracks, horizontal wall bowing, unlevel floors, sticking doors, and decayed support columns.

Roof and attic condition

Inspectors evaluate the exterior roofing materials from the ground, from ladders, or by walking the roof when safe. They look for missing or damaged shingles, failing flashing around chimneys and vents, and deteriorating gutters and downspouts. Inside the attic, inspectors check for proper insulation depth, adequate ventilation, roof framing integrity, and signs of chronic water leaks or mold growth.

Electrical system

The inspector reviews the service entrance wires, main electrical panel, circuit breakers, and subpanels. Key safety checks include identifying ungrounded outlets, improper wiring, double-tapped breakers, recalled panels, missing ground fault circuit interrupter (GFCI) protection near water sources, and hazardous outdated wiring like knob-and-tube or single-strand aluminum branch circuits.

Plumbing and water heater

Inspectors test supply lines, drainpipes, and fixtures throughout the home for functional water pressure, proper drainage, and active leaks. They check for corrosion on galvanized steel or lead pipes, verify that the water heater functions properly, and confirm that the temperature and pressure relief (TPR) valve and discharge pipe are correctly installed.

Heating and cooling systems

The inspector tests the heating, ventilation, and air conditioning (HVAC) systems using standard thermostat controls. They assess system age, check ductwork connections, evaluate air filters, and inspect visible components for rust, excessive wear, or refrigerant leaks.

Interior rooms, walls, ceilings, and floors

Every accessible interior room is examined for structural and water-related defects. Inspectors look for drywall cracking, sagging or water-stained ceilings, uneven subflooring, and improper window and interior door operation. They also test accessible electrical outlets, light switches, and heat registers.

Kitchen, appliances, and ventilation

In the kitchen, inspectors test built-in appliances, such as installed ranges, wall ovens, built-in microwaves, dishwashers, and garbage disposals, for basic functional operation. They examine cabinets, drawers, counter surfaces, sink drainage, garbage disposals, and kitchen exhaust fans to ensure proper exterior ventilation.

Bathrooms and ventilation

Inspectors check sinks, toilets, bathtubs, and showers to ensure adequate water flow, proper drainage, and secure mounting. They pay close attention to tile grouting, caulking around tubs, signs of hidden plumbing leaks beneath vanities, and mechanical exhaust fan operation to prevent moisture build-up.

Exterior, grading, and drainage

The exterior assessment includes examining exterior siding, brickwork, trim, soffits, fascia, window frames, exterior doors, decks, and walkways. Inspectors verify proper site grading, ensuring the ground slopes gently away from the foundation to prevent water pooling and basement water intrusion.

Safety hazards and signs of water damage

Inspectors maintain a heightened awareness for conditions that threaten occupant safety. They test smoke and carbon monoxide detectors, inspect stair handrails and deck guardrails, check automatic garage door safety reverses, and carefully record any visual evidence of active moisture damage or conditions that foster mold growth.

What does a home inspector not check?

Knowing what a home inspector skips is just as vital as knowing what they check. Operating under non-invasive visual standards, inspectors will not dismantle components, move heavy furniture, or perform destructive testing.

Cosmetic flaws and surface-level wear

A home inspector does not report on cosmetic defects that do not affect structural integrity or functional safety. Minor wall scuffs, paint discoloration, worn carpet, torn window screens, and aesthetic cabinet scratches are noted as normal wear and tear and left off major defect summaries.

Inside walls and below-ground areas

Inspectors cannot see through solid surfaces. They will not cut open drywall, remove insulation, pull up flooring, or dig underground to evaluate concealed wiring, hidden plumbing, or foundation footings. Any issue hidden inside walls or under dirt remains outside the scope of a standard inspection.

Pools, hot tubs, and specialty items

In-ground swimming pools, hot tubs, exterior saunas, irrigation systems, water softeners, and outdoor kitchen appliances are generally excluded from standard home inspections. Evaluating pool pumps, heaters, filtration systems, and chemical balances requires a specialized pool inspector.

Septic systems, sewer lines, and underground pipes

Standard home inspectors don’t inspect buried main sewer lines, septic tanks, or drain fields. Because underground pipe blockages and root intrusions can’t be identified visually from the surface, home buyers must hire a specialist to perform an inspection with specialized camera equipment or get a dedicated septic system evaluation.

Solar panels, fireplaces, and chimneys

While inspectors check visible fireplace hearths and dampers, they do not perform invasive internal chimney flue scans or clear creosote buildup. Similarly, solar panel electrical efficiency, inverter performance, and roof-attachment integrity require a licensed solar technician or electrician.

Home value, code compliance, and repair quotes

A home inspector doesn’t determine the market value of a home, nor do they evaluate whether a structure meets current municipal building codes. Furthermore, home inspectors generally don’t issue repair cost estimates. Home buyers should consult licensed contractors for accurate repair bids and rely on a formal real estate appraisal to establish fair market value.

Special home inspections to consider

If a standard inspection uncovers potential red flags, or if the home has specific geographic or age-related risks, scheduling add-on specialized home inspections is a smart move. A special inspection reviews aspects of your home not included in a basic home inspection checklist because they require specialized knowledge, tools, or testing methods.

Chimney inspection

A Level 2 chimney inspection utilizes specialized camera equipment lowered into the flue to identify internal tile cracks, structural masonry gaps, blockages, and hazardous creosote accumulation.

Septic system inspection

A licensed septic inspector pumps the tank, inspects internal baffles, evaluates liquid levels, and conducts a drain field absorption test to ensure waste management systems operate safely without groundwater contamination risks.

Sewer inspection

A sewer scope inspection uses a flexible video camera inserted into the main drain line to identify crushed pipes, offset joints, low spots, and invasive tree roots running from the home to the municipal sewer main.

Soil inspection

Geotechnical soil inspections evaluate earth stability, soil drainage capabilities, and erosion risks, which is especially critical for homes built on steep hillsides or in areas with expansive clay soils.

Lead-based paint inspection

For homes constructed prior to 1978, a specialized lead paint inspection uses X-ray fluorescence analyzers or laboratory paint chip testing to identify dangerous lead hazards on walls, windowsills, and trim.

Radon inspection

Radon is an odorless, naturally occurring radioactive gas that can accumulate in basements and crawl spaces. Specialized continuous monitors or charcoal canisters test indoor air quality over 48 hours to confirm radon levels remain below the Environmental Protection Agency's (EPA) action threshold.

Mold inspection

When excess moisture or visible staining is present, a certified mold inspector collects surface swabs and indoor air samples to identify active airborne spore concentrations and toxic mold species. This inspector will also look for hidden mold growth and moisture issues.

Termite inspection

Also known as a Wood-Destroying Insect (WDI) inspection, a licensed pest inspector checks the home for active termite activity, carpenter ants, powderpost beetles, and existing structural wood damage.

Common red flags home inspectors report

While most home inspection reports highlight minor fixes, certain major defects represent significant financial liabilities. Understanding common inspection red flags helps buyers prioritize their response.

Water damage and moisture problems

Chronic water intrusion is a top concern for inspectors. Active roof leaks, standing water in crawl spaces, basement flooding, and rotting subfloors can ruin structural framing and cause pervasive mold growth if left unresolved.

Foundation cracks and structural shifts

While small hairline settling cracks are common in concrete, wide horizontal foundation cracks, stair-step masonry cracking, bowed walls, and sagging roof ridge lines indicate severe structural movement that may require costly engineering interventions.

Outdated or unsafe electrical systems

Outdated electrical components, such as single-strand aluminum branch wiring, ungrounded outlets, undersized 60-amp main service panels, and recalled breaker panels, pose severe structural fire hazards and usually require immediate replacement.

Roof deterioration and leaks

An aging roof nearing the end of its functional life, characterized by missing shingles, widespread granule loss, dry-rotted decking, and failing valleys – presents a major near-term replacement expense.

Failing HVAC equipment

Old heating and cooling equipment may exhibit cracked heat exchangers, non-functional A/C compressors, or unsafe gas line connections, representing immediate safety concerns or expensive capital replacements.

What are home inspectors not allowed to do?

State regulations and industry codes of ethics strictly govern what a home inspector can and cannot do. These restrictions protect consumer interests and maintain inspector objectivity.

While regulations vary slightly depending on local state licensing laws, certified home inspectors are generally prohibited from doing the following:

• Performing repair work: An inspector cannot offer to repair, maintain, or perform contract work on any property they have inspected within the previous 12 months.
• Offering contractor referrals for compensation: Inspectors are forbidden from accepting kickbacks, referral fees, or financial incentives from contractors or real estate agents.
• Predicting market value or lifespan: They are legally prohibited from providing formal property appraisals or guaranteeing the remaining lifespan of appliances.
• Performing destructive testing: Inspectors cannot break open walls, dismantle equipment, or force access into unsafe areas.
• Risking personal safety: An inspector is not required or permitted to climb dangerously steep roofs, enter flooded crawl spaces, or approach exposed high-voltage electrical hazards.

Home inspection vs. home appraisal

It is common for home buyers to confuse a home inspection with a home appraisal, but they serve entirely different roles in a real estate transaction.

What happens after the home inspection?

Receiving a 40-page inspection report filled with photos and notes can feel overwhelming, but it’s simply a tool to guide your post-inspection strategy.

Reviewing the inspection report

Read through the summary section of the report first, focusing on major structural defects, safety hazards, and immediate repair priorities rather than minor cosmetic flaws. Consult with your real estate agent to understand which items are major concerns and which are standard maintenance tasks.

Negotiating repairs or price adjustments

Using the findings in the inspection report, home buyers can negotiate with the seller. Depending on the market and purchase agreement terms, buyers can request that the seller fix specific safety items before closing, provide a financial credit toward closing costs, or lower the overall purchase price.

Deciding whether to move forward

If the inspection reveals catastrophic structural defects or hazardous issues that the seller refuses to repair or offer concessions for, an inspection contingency allows the buyer to cancel the contract and walk away with their earnest money deposit intact.

How to find a home inspector

Hiring an experienced, qualified professional is essential for a thorough inspection. Typically, the home buyer pays the home inspection costs, so finding a home inspector you trust is important. Start by asking your real estate agent, family, or friends for personal recommendations. You can also search professional trade organization directories such as the American Society of Home Inspectors (ASHI) or the International Association of Certified Home Inspectors (InterNACHI).

When vetting potential inspectors, ask key questions:

• Are you licensed and insured in this state? (Note: Most states require licensing, though 14 states currently do not: California, Colorado, Georgia, Hawaii, Idaho, Iowa, Kansas, Maine, Michigan, Minnesota, Missouri, Nebraska, Utah, and Wyoming.)
• How many years of experience do you have inspecting residential properties?
• Do you belong to a recognized professional association like ASHI or InterNACHI?
• Can I see a sample inspection report?
• Are home buyers welcome to attend the physical inspection?

How to prepare for a home inspection

Both buyers and sellers play a role in ensuring a smooth and efficient home inspection appointment.

As a home buyer

To get the most out of your inspection, prepare by taking these steps:

• Compile a list of specific questions or areas of concern you noticed during initial showings.
• Plan to attend the final hour of the inspection to walk through the property with the inspector.
• Review the Seller's Disclosure statement alongside the final inspection report to compare disclosed issues against new findings.

As a home seller

Sellers can ensure the inspector has complete access to the property by doing the following:

• Clear physical paths to attics, basements, crawl spaces, water heaters, and electrical panels.
• Unlock all locked gates, garage doors, electrical panels, and storage sheds.
• Make minor repairs in advance, such as replacing dead light bulbs, fixing leaking faucets, and replacing dirty HVAC filters.
• Provide documentation for past repairs, roof replacements, or major system upgrades.

FAQ

You may still have questions about home inspections and what home inspectors do. We have the answers.

What is the biggest red flag in a home inspection?

Major structural foundation movement and widespread, unaddressed water damage or active toxic mold are widely considered the biggest red flags in a home inspection due to their excessive remediation costs.

Does a home inspector check every room?

Yes, home inspectors visually check every accessible room in the home, testing accessible doors, windows, light switches, heating vents, and electrical outlets.

Can a house fail a home inspection?

No, a home cannot pass or fail a home inspection. An inspection is an objective visual report on property conditions, not an exam with a passing score.

Do home inspectors check for mold?

Standard home inspectors look for visual signs of water damage and visible mold-like substances, but they do not perform formal air sampling or lab analysis unless qualified to offer a specialized mold inspection.

Do home inspectors check for termites?

Inspectors check for obvious structural wood rot or visible pest damage, but a formal, certified termite inspection usually requires a separate licensed pest inspector.

How soon do you get the home inspection report?

Most professional home inspectors deliver a complete, digital inspection report within 24 – 48 hours of completing the physical site visit.

The bottom line: Home inspections help you close with confidence

A professional home inspection removes guesswork by providing a clear, objective evaluation of a property’s physical health and safety. The resulting inspection report gives buyers the power to negotiate repairs or credits and lets sellers fix hidden defects before listing – ensuring everyone moves to closing with total peace of mind.

Ready to finance your home after a successful inspection? Start your mortgage application today.

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