Home Inspection Checklist: Complete Guide for Buyers & Sellers

The Complete Home Inspection Checklist

A professional home inspection covers dozens of components and systems. Here's what inspectors are actually checking and what issues typically appear:

System	What Inspectors Check	Common Issues
Roof	Shingles, flashing, gutters, underlayment, vents. Age and remaining lifespan.	Missing shingles, leaks, improper installation, aging (15+ years old)
Foundation	Cracks, settling, bowing walls, water damage, moisture. Crawl space condition.	Cracks indicating settling, water stains, mold, pest activity, moisture
Electrical	Panel, breakers, wiring, outlets, switches, GFCI/AFCI protection, safety	Outdated aluminum wiring, double-tapped breakers, no GFCI in bathrooms, fire hazards
Plumbing	Water shutoff, pipe material, water pressure, leaks, drainage, sewer line	Galvanized pipes (corrosion), slow drains, leaks, water heater age (10+ years)
HVAC	Furnace/AC age, operation, venting, ductwork, refrigerant levels, efficiency	Old systems nearing end of life, poor performance, improper venting, no maintenance
Structure	Joists, beams, floor bounce, attic framing, wall alignment, settling	Sagging floors, soft spots indicating rot, pest damage, improper support
Windows/Doors	Operation, seals, weatherstripping, locks, caulking, condition	Broken seals (fogging), stuck windows, poor weatherproofing, broken locks
Insulation	Presence, type, R-value in attic and walls, moisture issues	Missing insulation, settling, damage, inadequate coverage for climate

Pro Tip: Look for items marked "Safety Issue" or "Major Repair Needed" in your inspection report—those are your red flags. Everything else is documentation. A scratched outlet cover matters way less than an outdated electrical panel that's a fire hazard.

Roof: The First Line of Defense

Your roof is your home's primary defense against weather. When it fails, water gets in. Water damage is the most expensive and destructive problem that develops in homes. Inspectors spend significant time evaluating your roof.

Roof Structure & Safety

Age and remaining lifespan: Most roofs last 15-25 years. An old roof is a future major expense.
Shingle condition: Missing, cracked, or curling shingles need replacement soon.
Flashing integrity: Around chimneys, vents, and valleys. Improperly sealed flashing is the #1 source of roof leaks.
Gutters & downspouts: Properly functioning drainage prevents water damage to siding, foundation, and landscape.
Venting: Proper attic ventilation prevents moisture buildup and premature deterioration.
Underlayment condition: If visible, should be intact and not deteriorated.

Common Roof Issues Found During Inspections

Aging (15+ years): Roof replacement typically costs $5,000-$15,000+. When you see an old roof, budget for replacement in the next 5-10 years.
Missing or damaged shingles: Each missing shingle is a leak risk. Small patches are cheap; widespread replacement is expensive.
Improper installation: Nails in wrong location, insufficient fasteners, or improper overlap all cause premature failure.
Poor flashing: The #1 cause of roof leaks. Bad flashing around chimneys or valleys will cause leaks during heavy rain.
Insufficient ventilation: Creates moisture buildup that deteriorates the underside of the roof and shortens lifespan significantly.

Foundation & Structure: The Skeleton

The foundation is literally what holds everything up. If the foundation is compromised, nothing else matters. Structural damage is the most serious issue an inspector can find.

Foundation Issues Inspectors Look For

Cracks in foundation walls or floor: Small hairline cracks are common. Larger cracks (wider than 1/4 inch) or horizontal cracks indicate settling or water pressure and need professional evaluation.
Bowing or leaning foundation walls: Indicates hydrostatic pressure from water pushing on the foundation. This is a serious structural issue requiring repair.
Water damage or stains: Indicates past or ongoing water intrusion. Water damage that occurs once will occur again.
Mold or mildew growth: Indicates moisture problem that needs addressing before it becomes a structural issue.
Efflorescence (white powder on walls): Mineral deposits indicating water is moving through the foundation.
Pest damage or evidence: Termites and carpenter ants cause serious structural damage if not caught early.

Real Talk: If the inspector finds any concerns about foundation settlement or structural damage, get a second opinion from a structural engineer before you make any decisions. It's a few hundred dollars now versus tens of thousands in surprises later.

Structural Components

Beyond the foundation itself, inspectors check the frame and support structure:

Floor joists and beams: Sagging or shifted posts indicate settlement or deterioration.
Floor structure: No excessive bounce or sagging. A floor that bounces when you walk isn't structurally safe.
Attic framing: Rafters in good condition with no rot. Attics are where you find water damage and pest damage before it becomes catastrophic.

Electrical Systems: Safety First

Outdated or damaged electrical systems are a fire hazard. If the inspector flags electrical issues, take them seriously.

Electrical Panel & Service

Proper panel rating: Modern homes need 100-200 amps. Older homes with 60 amps may struggle with today's appliances.
Breaker condition: No double-tapped breakers (two breakers in one slot—an unsafe hack).
Proper grounding: Essential for safety and lightning protection.
Safe panel location: Should be accessible in an emergency, not hidden or hard to reach.

Outlets, Switches & Wiring

GFCI protection: Ground fault circuit interrupters in bathrooms and kitchens. These shut off power if they sense water—they're life-saving.
AFCI protection: Arc-fault circuit interrupters in bedrooms and living areas. These prevent fires from electrical arcing.
Proper grounding: Correct hot/neutral connections prevent shock hazards.
All lights and switches functional: Flickering lights can indicate loose connections—a fire hazard.

Outdated Electrical Systems: Homes with aluminum wiring, knob-and-tube wiring, or Federal Pacific panels present fire hazards. These require replacement, costing $8,000-$15,000+. Insurance companies often deny coverage for these systems.

Plumbing: Water Damage Prevention

Water damage is the most common and costly problem in homes. Good plumbing means no surprises. Outdated plumbing means very expensive surprises.

Water Supply & Distribution

Water shutoff location and function: You need to know where this is—fast shutdown can save thousands in damage.
Pipe material: Copper is excellent. PVC and PEX are modern. Galvanized steel deteriorates and causes low pressure and rust.
Adequate water pressure: Throughout the home. Low pressure usually means old galvanized pipes nearing replacement.
No visible leaks: Under sinks, in crawl spaces, or around water heater. Even small slow leaks add up to thousands in damage.
Water heater age and condition: Water heaters last 10-15 years. An old one failing mid-winter is no fun.

Drainage & Waste Systems

Sewer line integrity: No tree root intrusion, proper slope. Main line failure costs $3,000-$25,000.
All drains empty quickly: Slow drains may indicate underlying issues.
P-traps and U-bends: Present under all fixtures to prevent sewer gases.
Proper venting: Allows air in and gases out. Bad venting causes slow drains and bad smells.
Sump pump (if applicable): Present and functional in basements prone to water.

Galvanized Pipe Issues: Homes built before 1980 often have galvanized steel pipes that deteriorate from inside. Replacing entire plumbing systems costs $8,000-$25,000.

HVAC: Heating & Cooling Systems

HVAC replacement is one of the most expensive repairs. A good inspection tells you if the current system is reliable or if replacement is imminent.

Heating System

Furnace type and age: Gas, oil, electric heat pump, or steam. Typical lifespan 15-20 years.
Even heating throughout home: No cold spots or unusual noises.
Proper venting and carbon monoxide safety: Gas furnaces must vent properly. Improper venting is dangerous.
Regular maintenance: Dirty filters and unmaintained systems fail prematurely.

Cooling System (Air Conditioning)

AC unit age: Typical lifespan 12-15 years. Old units fail during summer heat.
Proper refrigerant levels: Low levels mean the system isn't working efficiently or at all.
Even cooling throughout home: Some rooms shouldn't be significantly hotter or colder.
Outdoor condenser unit condition: Should be in good condition with proper clearance.

Ductwork & Distribution

Ductwork integrity: No disconnected, leaking, or damaged ducts.
Insulation on ducts: Helps maintain temperature and efficiency.
Proper sizing: Oversized or undersized systems don't work efficiently.

Windows, Doors & Exterior

Windows and doors are your home's interface with the outside world. They need to function properly and seal well to prevent water damage and energy loss.

Windows

Operation: All windows should open and close smoothly.
Seal integrity: No fogging between panes (indicates failed seals).
Weatherstripping and caulking: Prevents air and water infiltration.
Condition: No cracks, rot, or deterioration.

Doors

Operation: All doors operate smoothly and latch properly.
Weather sealing: Proper seals around door frames prevent drafts and water intrusion.
Locks and hardware: All functional and secure.
Exterior condition: No rot, warping, or damage.

Exterior Walls & Siding

Siding condition: No cracks, holes, or deterioration.
Proper water drainage: Grading slopes away from home. Water pooling near foundation is a major issue.
No active water stains: Indicates water intrusion problems.
Proper flashing: Around windows, doors, and roof transitions.

HPFrom the HouseProbe Community

Real questions from homeowners like you

“First time buyer here. Got my inspection report and it’s 47 pages long with photos of every scratch and dent. How do I know what’s actually serious vs just the inspector covering their butt?”

Look for items marked “Safety Issue” or “Major Repair Needed”—those are your red flags. Everything else is documentation. A scratched outlet cover matters way less than an outdated panel.

“Inspector said our attic insulation is ‘inadequate’ and the crawl space has ‘minor moisture.’ These sound like code words to me. How worried should I be?”

Inadequate insulation means higher heating/cooling costs but isn’t a deal-breaker—you can add more. Minor moisture is more concerning and needs addressing before it becomes a mold or structural issue. Get a specialist’s opinion on the crawl space.

FAQ

What do home inspectors look for?

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Professional home inspectors evaluate the home's structural integrity, electrical systems, plumbing, HVAC, roof condition, insulation, ventilation, and safety hazards. They check for water damage, mold, pest infestations, code violations, and systems that need maintenance or replacement. The inspection typically covers the roof, foundation, walls, floors, doors, windows, kitchen, bathrooms, basement/crawl space, attic, and all major systems. Inspectors use visual inspection, testing equipment, and sometimes specialized tools like thermal imaging or moisture meters to create a comprehensive assessment.

How long does a home inspection take?

A typical home inspection takes 2-4 hours depending on the home's size, age, and condition. Larger homes or those with complex systems may take longer. Older homes with more potential issues require more thorough evaluation. The inspector will provide a detailed written report within 24-48 hours of the inspection. You should plan to be present during the inspection so you can ask questions and better understand the findings.

What is considered a major repair in a home inspection?

Major repairs typically cost $1,000+ to fix and involve critical home systems: roof replacement, foundation repair, electrical panel replacement, plumbing system replacement, HVAC system failure, water damage or mold remediation, and structural damage. Items flagged as "Safety Issues" in the report are always considered major. Minor issues like cosmetic damage, missing caulk, or paint touch-ups are not major. Your inspector will clearly mark items by severity level in the report.

What should you not do during a home inspection?

Don't interfere with the inspector or distract them. Don't access attics, crawl spaces, or mechanical areas yourself—these are the inspector's job and can be dangerous. Don't ask the inspector for repair recommendations (they can only report findings, not advise on fixes). Don't expect an inspection to find everything—no inspection is 100% complete. Don't rely solely on the inspection report; get second opinions from specialists if major issues are found. Most importantly, don't skip the inspection to save money—the $300-$500 cost can prevent $10,000+ in surprises.

How much does a home inspection cost?

Home inspections typically cost $300-$500 for average homes, with larger homes or complex inspections costing $500-$800. Some inspectors charge per square foot ($0.10-$0.15/sq ft). Additional specialized inspections (radon, mold, pest, septic, well) add $200-$500 each. The inspection cost is a fraction of potential repair costs you'll avoid by identifying problems early. Shop around but prioritize experience and credentials over price—a $200 bargain inspection from an untrained inspector saves money you don't want to save.

Can a home fail an inspection?

Technically homes don't "pass" or "fail," but inspections can reveal serious problems. Major structural damage, foundation issues, electrical hazards, or significant water damage can be dealbreakers that make a home unmarketable or unsafe to occupy. These are "Major Repair Needed" findings. Most homes have minor issues that don't prevent sale but allow buyers to negotiate repairs or price reductions. An inspection report is a tool to help buyers make informed decisions, not a pass/fail test.

Who pays for the home inspection?

The buyer pays for the home inspection. Inspections are a condition of the purchase agreement and the buyer chooses and schedules the inspector (the seller cannot choose for them). In rare cases, if major issues are found, buyers can renegotiate the purchase price or request the seller pay for repairs. The seller does not pay for the inspection unless they've agreed to pay for major repairs as a condition of sale.