Common Problems Found During a Home Inspection

The most common problems found during a home inspection are roof damage, electrical defects, plumbing leaks, foundation cracks, poor drainage, HVAC failures, and window issues. According to a survey by Porch involving 998 homebuyers, 86% of home inspections uncover at least one problem that needs to be fixed. Roof issues appear in nearly 20% of reports, electrical problems in about 19%, and window defects in over 18%. Knowing what inspectors find most often helps buyers in Mid-Missouri prepare for the process and make smarter decisions. This article covers every major problem category, what each one means for buyers, and when to be concerned.

What Are the Most Common Problems Found During a Home Inspection?

The most common problems found during a home inspection are issues with the roof, electrical system, windows, plumbing, HVAC, foundation, drainage, and insulation. According to data from the Porch survey, the top three findings are roof problems (19.7%), electrical issues (18.7%), and window defects (18.4%). ZipDo reports that the average home inspection uncovers 3 to 5 deficiencies, with average potential repair costs of about $4,000.

Not every finding is a deal-breaker. Many items on an inspection report are minor maintenance issues that cost little to fix. The key is knowing which problems are serious safety or structural concerns and which ones are cosmetic. A certified inspector will explain the difference. This article is written by Alan Redburn, CPI, a Certified Professional Inspector who has evaluated hundreds of homes across the Mid-Missouri region.

Are Roof Problems the Most Common Home Inspection Finding?

Yes, roof problems are the most common home inspection finding. According to the Porch survey, roof issues show up in nearly 20% of all inspection reports where problems are identified. These range from a few missing or cracked shingles to widespread damage from water leaks, poor flashing, or aging materials. ZipDo estimates that the average roof needs repair or replacement after 20 to 25 years.

In Mid-Missouri, roofs take a beating from heavy rain, ice, hail, and wind. Homes in Cuba, Rolla, and Jefferson City with roofs older than 15 years are more likely to show signs of wear. Common roof findings include damaged shingles, deteriorated flashing around chimneys and vents, sagging roof decking, and clogged or damaged gutters. These problems can lead to water intrusion, which then causes interior damage to ceilings, walls, and insulation.

Roof replacement is one of the most expensive home repairs, costing between $8,000 and $25,000 depending on the size and materials, according to Amerisave. Catching roof problems early through a buyer’s inspection gives you the facts you need to negotiate repairs or a price reduction before closing. Knowing the signs of a failing roof can also help you spot trouble before the inspector arrives.

What Electrical Issues Do Home Inspectors Find Most Often?

The electrical issues home inspectors find most often are missing GFCI outlets, outdated wiring, overloaded panels, improper grounding, and exposed wires. According to the Porch survey, electrical problems appear in about 18.7% of inspection reports. CalPro Inspection Group reports that minor electrical deficiencies show up in 60% to 70% of all inspections, making them one of the most frequent findings overall.

Electrical problems are serious because they create fire and shock hazards. According to the National Fire Protection Association (NFPA), electrical distribution and lighting equipment caused an average of 30,740 home fires per year from 2016 to 2020, resulting in 390 deaths and $1.4 billion in property losses annually. The U.S. Fire Administration reports that wire insulation aging, loose connections, and worn-out switches and receptacles all increase fire risk.

Homes built between 1965 and 1973 are more likely to have aluminum wiring, which deteriorates faster than copper and is a known fire hazard. Older homes in Sullivan, St. James, and Farmington may also have outdated electrical panels that cannot handle modern power demands. ZipDo estimates that roughly 25% of homes have some type of electrical code violation found during inspection. An electrical panel upgrade typically costs $1,500 to $3,000, according to Amerisave.

How Common Are Plumbing Problems During a Home Inspection?

Plumbing problems are very common during a home inspection. According to ZipDo, about 30% of homes in the United States have some form of plumbing leak. Inspectors look for dripping faucets, slow drains, low water pressure, leaking supply lines, damaged water heaters, and signs of past water damage. Even small leaks can lead to mold growth, wood rot, and higher water bills if left unfixed.

The plumbing inspection also checks the water heater for age, condition, and proper installation. Water heaters typically last 8 to 12 years. Replacement costs range from $800 to $2,500 for a standard tank unit and $1,500 to $4,000 for a tankless system, according to Amerisave. For homes in rural Mid-Missouri that use well water, separate testing is needed to check water quality, flow rate, and safety.

Older homes in DeSoto, Eureka, and St. Clair may still have galvanized steel pipes, which corrode from the inside over time and restrict water flow. Whole-house repiping costs between $4,000 and $15,000 depending on the home’s size, according to Amerisave. Buyers should pay close attention to any plumbing findings and get a plumber’s estimate for anything flagged in the report.

Do Home Inspectors Find Foundation Issues Often?

Yes, home inspectors find foundation issues in a significant number of inspections. According to ZipDo, about 20% of homes have foundation problems that can be detected during an inspection. About 10% of inspections reveal major structural damage. Foundation cracks, settling, bowing walls, and water intrusion through the foundation are among the most costly problems a buyer can face.

Minor hairline cracks from normal settling are common and usually not a cause for alarm. However, horizontal cracks, stair-step cracks in block walls, and cracks wider than a quarter inch can signal serious structural movement. According to National Property Inspections, horizontal cracks may require stabilization repairs like wall tiebacks or carbon fiber reinforcement. HomeAdvisor data cited by the National Association of REALTORS puts minor foundation crack repairs at around $500, while major foundation work can cost $10,000 or more.

Missouri’s soil conditions can make foundation problems worse. Clay-heavy soils expand when wet and shrink when dry, putting stress on foundations over time. Homes in Cuba, Lebanon, and Owensville that sit on this type of soil should receive extra attention during the foundation portion of the inspection. Inspectors also look for secondary signs like sticky doors, cracked interior walls, and uneven floors, which can point to foundation movement underneath.

What Drainage and Grading Problems Show Up on Inspection Reports?

Drainage and grading problems that show up on inspection reports include water pooling near the foundation, soil grading that slopes toward the house, clogged gutters, and downspouts that dump water too close to the structure. According to National Property Inspections, high grading around the foundation is one of the most common issues identified on inspection reports. The proper minimum clearance between the home’s exterior and the soil is 4 to 6 inches.

When water collects against the foundation, it can cause cracks, wood rot, mold, and even structural failure over time. Many homes across Mid-Missouri sit on sloped or uneven terrain, which makes proper drainage even more important. The fix is often simple and affordable. Regrading the soil to slope away from the foundation for at least 5 feet and extending downspouts at least 5 feet from the house can solve most drainage problems. The national average for gutter installation runs between $624 and $1,705, according to data cited by the National Association of REALTORS.

Buyers in Rolla, Washington, and Union should look at the exterior drainage carefully during their inspection walkthrough. Standing water in the yard, water stains in the basement, and damp crawl spaces are all red flags that the drainage system needs attention.

Are HVAC Problems a Common Inspection Finding?

Yes, HVAC problems are a common inspection finding. Heating, ventilation, and air conditioning issues rank among the top five problems found during home inspections, according to ZipDo. Common findings include dirty filters, aging equipment, ductwork that is improperly sealed, refrigerant leaks, and systems that do not heat or cool efficiently. Most HVAC systems have a lifespan of 15 to 25 years depending on maintenance, according to Raleigh Realty.

Replacing an HVAC system is expensive, costing between $5,000 and $15,000 depending on the type and size, according to Amerisave. Knowing the age and condition of the system before you buy is critical. A system near the end of its life may still work during the inspection but could fail within a year or two of purchase. Missouri summers are hot and winters get cold, so a reliable HVAC system is not optional for homes in Jefferson City, St. Robert, and across Mid-Missouri.

The inspector will check if the system turns on, runs through a complete cycle, and distributes air evenly. Thermostat operation, ductwork condition, and filter status are also evaluated. If the inspector flags concerns, a follow-up evaluation by an HVAC technician can give you a more detailed picture of remaining life and repair needs.

What Window and Door Defects Do Inspectors Report?

Window and door defects that inspectors report include broken seals, cracked glass, failed weatherstripping, stuck or misaligned frames, and missing locks or hardware. According to the Porch survey, window problems appear in over 18% of inspection reports where issues are found. Windows that are not properly sealed can lead to energy loss, higher utility bills, and moisture intrusion.

In older homes across Mid-Missouri, single-pane windows are still common. These windows offer very little insulation compared to modern double-pane or triple-pane options. Doors that stick or do not latch properly can also be a sign of foundation movement or structural shifting. The inspector notes these conditions and recommends further evaluation when needed.

How Common Is Poor Insulation and Ventilation in Homes?

Poor insulation and ventilation are very common in homes. According to ZipDo, nearly 50% of home inspectors report finding issues with insulation and ventilation. About 40% of homes have faulty or inadequate insulation. These problems lead to energy loss, higher heating and cooling bills, and moisture buildup that can cause mold growth.

Inspectors check insulation levels in the attic and crawl space and look for proper ventilation that allows air to circulate and moisture to escape. Homes with attic insulation problems are especially common in older Mid-Missouri properties. Inadequate attic ventilation traps heat in the summer and moisture in the winter, which can damage roof decking and promote mold. Fixing insulation and ventilation issues is one of the most cost-effective upgrades a homeowner can make.

Do Inspectors Find Mold and Moisture Problems?

Yes, inspectors frequently find signs of mold and moisture problems. According to ZipDo, indoor air quality concerns are identified in about 15% of home inspections. Mold grows wherever excess moisture exists, including bathrooms, basements, crawl spaces, and around leaking pipes or windows. Small amounts of mold around a bathtub or sink are normal. Mold on walls, ceilings, or in the attic points to a bigger moisture issue.

A standard home inspection notes visible signs of mold and moisture but does not include laboratory testing. For a complete evaluation, buyers should add mold testing to their inspection. Professional mold remediation can cost thousands of dollars depending on the extent of the problem. Catching it early protects both your health and your budget. Homes in the Cuba, Missouri area and across Mid-Missouri with basements and crawl spaces are at higher risk for moisture issues, especially after heavy rain.

What About Termites and Pest Damage?

Termites and pest damage are found in a notable percentage of inspections. According to ZipDo, about 5% of home inspections detect termite damage. Termites eat wood from the inside out, so the damage is often hidden until it becomes severe. Signs include mud tubes in the crawl space, hollow-sounding wood, and small piles of frass (termite droppings). According to Angi, termite damage repairs average $3,000 but can exceed $37,500 in severe cases.

A standard home inspection does not include a formal termite inspection. Buyers should add a WDO termite inspection to their standard inspection, especially for homes with wood-to-soil contact or moisture problems. Learning to spot the signs of termite damage that most homeowners miss can help you catch problems early. A termite inspection is worth it for any home purchase in Mid-Missouri.

Comparison Table: Common Home Inspection Problems, Frequency, and Typical Repair Costs

Sources: Porch homebuyer survey; ZipDo; Amerisave; HomeAdvisor data cited by National Association of REALTORS; Angi 2025 cost data.

Should You Walk Away From a Home After a Bad Inspection?

No, you should not automatically walk away from a home after a bad inspection. Most inspection findings are fixable. According to a quote from home inspector Ryan Long cited by the National Association of REALTORS, “Everything is fixable. None of these items need to be deal-breakers.” The inspection report gives you the information to negotiate with the seller for repairs, a price reduction, or a closing credit.

However, there are situations where walking away makes sense. If the inspection reveals major structural damage, widespread mold, or repair costs that exceed 10% of the home’s value, the risk may outweigh the reward. According to ZipDo, buyers are 42% more likely to back out of a purchase when significant issues are uncovered. Your real estate agent can help you weigh the options. Learning how to negotiate home inspection repairs gives you leverage in any situation.

Can You Prevent Common Home Inspection Problems Before Selling?

Yes, you can prevent many common home inspection problems before selling. A pre-listing inspection lets sellers identify and fix issues before the home goes on the market. According to ZipDo, nearly 60% of real estate agents recommend pre-listing inspections to sellers. Fixing problems in advance can speed up the sale, reduce buyer negotiations, and increase buyer confidence.

Sellers in Rolla, Cuba, and Jefferson City who invest in a home inspection before selling often see smoother transactions. Simple fixes like replacing missing shingles, adding GFCI outlets in bathrooms, repairing leaky faucets, and improving drainage around the foundation can eliminate the most common findings from the report.

Frequently Asked Questions

What Is the Most Expensive Problem Found During a Home Inspection?

The most expensive problem found during a home inspection is usually foundation damage or a full roof replacement. Foundation stabilization can cost $10,000 to $50,000 or more for severe cases, according to Amerisave. Roof replacement ranges from $8,000 to $25,000. HVAC system replacement falls in the $5,000 to $15,000 range. These large-ticket items are the reason a professional inspection is so important for buyers across Mid-Missouri.

How Do I Know if an Inspection Finding Is Serious?

You know an inspection finding is serious if it involves a safety hazard, structural damage, or a major system failure. Problems like foundation cracks wider than a quarter inch, faulty wiring, active water leaks, and a failing HVAC system are serious. Cosmetic issues like chipped paint, minor drywall cracks, and worn carpet are not. Your inspector will explain which findings need immediate attention and which are routine maintenance items.

Do New Homes Have Fewer Inspection Problems Than Older Homes?

New homes have fewer inspection problems than older homes in many cases, but they are not problem-free. Even newly built homes can have construction errors, missing components, or code violations. According to Angi, new construction inspections cost between $280 and $400. A new construction inspection catches these issues before the builder’s warranty expires, which is especially valuable for homes being built in the Mid-Missouri area.

What Problems Does a Home Inspector Not Check For?

A home inspector does not check for radon, mold behind walls, termites, well water quality, septic system function, or conditions inside walls, floors, or underground. According to the ASHI Standard of Practice, inspectors evaluate only readily accessible, visually observable systems and components. Add-on services like radon testing and septic inspections fill these gaps. The EPA estimates that 1 in 15 homes has elevated radon levels, so testing is especially important in Cuba, MO and the Mid-Missouri region.

How Long Does It Take to Fix Common Home Inspection Problems?

The time it takes to fix common home inspection problems ranges from a few hours to several weeks depending on the issue. Minor repairs like adding GFCI outlets or fixing a leaky faucet can be done in a day. Roof replacement takes 1 to 3 days. Foundation work can take a week or more. HVAC replacement is usually completed in 1 to 2 days. Getting contractor estimates quickly after the inspection helps buyers and sellers stay within the contingency timeline.

Should I Get a Home Inspection Even in a Seller’s Market in Mid-Missouri?

Yes, you should get a home inspection even in a seller’s market in Mid-Missouri. Waiving the inspection to make your offer more competitive is risky. According to the Porch survey, 86% of inspections find at least one problem, and buyers who negotiate save an average of $14,000. A few hundred dollars for an inspection can protect you from tens of thousands in surprise repairs. Buyers in Farmington, Union, and Waynesville should always include an inspection contingency in their purchase contract.

Final Thoughts

The most common problems found during a home inspection are roof damage, electrical defects, plumbing leaks, foundation issues, poor drainage, HVAC failures, window problems, and inadequate insulation. With 86% of inspections uncovering at least one issue, the question is not whether the inspector will find something, but what they will find. Knowing these common problems in advance helps buyers and sellers in Mid-Missouri prepare, negotiate, and make informed decisions.

If you are buying or selling a home in Cuba, Missouri or anywhere across the Mid-Missouri area, ARC Home Inspections provides thorough property evaluations with free thermal imaging and moisture meter testing included. Reports are delivered within 24 hours with photos, videos, and clear explanations of every finding. Contact ARC Home Inspections today to schedule your inspection and know exactly what you are buying before you sign.