Home inspections uncover problems in 86% of properties, and buyers negotiate an average of $14,000 off the sale price based on inspection findings. But in 2026, buyers are walking away from deals at record rates. Home purchase cancellations hit 17.6% in December 2025, the highest rate outside the pandemic, and inspection or repair issues rank among the leading reasons sales fall through.
The most common inspection problems include roof issues at 19.7%, electrical problems at 18.7%, and window defects at 18.4%. While minor issues are negotiable, certain findings trigger immediate deal-breaker conversations. Here are the problems that most commonly derail home sales.
Foundation and Structural Issues
Foundation problems signal major structural concerns that can cost tens of thousands of dollars to repair. Common warning signs include large cracks in walls or floors, doors that do not close properly, and sloping floors. Foundation repair costs average $5,165 but can range between $2,218 and $8,111 depending on severity.
Foundation issues are rarely cosmetic. They indicate ongoing movement, soil problems, or water intrusion that will continue to worsen without intervention. Lenders often require foundation repairs before approving financing, which means sellers must either fix the problem or accept a significantly lower offer from a cash buyer willing to take on the risk.
Roof Problems
A roof showing signs of deferred maintenance can signal water damage to sheathing, rafters, and other structural elements in the attic. Roof warranties typically last 25 to 50 years, so a roof at or near the end of its lifespan represents a major expense buyers are often unwilling to absorb immediately after purchase.
Minor roofing issues, such as a few loose shingles, exposed nail heads, or incorrect flashing, can usually be addressed after closing. But severe roof damage, active leaks, or a roof requiring full replacement often becomes a negotiation sticking point. Buyers either request credits to cover replacement costs or walk away if sellers are unwilling to adjust the price.
Electrical Safety Issues
Outdated wiring, overloaded panels, and DIY electrical work rank among the most serious safety concerns an inspection can uncover. Aluminum wiring, knob-and-tube wiring in older homes, and circuits carrying far more load than originally designed create fire hazards that insurance companies and lenders flag immediately.
Electrical problems are not negotiable from a safety standpoint. Buyers who proceed with a purchase despite known electrical hazards may face difficulty obtaining homeowners’ insurance or securing financing. The cost to rewire a home can exceed $10,000, making it one of the more expensive repairs buyers encounter during inspection.
HVAC Problems
HVAC failures are among the most expensive post-purchase surprises buyers face. A complete HVAC replacement costs $7,500 to $15,000, depending on system type and home size, and standard home inspections often fail to catch problems until it is too late.
Most home inspections simply confirm whether the HVAC system powers on and off. That basic check does not reveal refrigerant leaks, failing compressors, cracked heat exchangers, or systems running on phased-out R22 refrigerant that costs significantly more to service. Systems over 12 to 15 years old are statistically very likely to fail within months, yet many buyers discover this only after closing.
“We often see buyers assume the HVAC is fine because it turns on during the inspection, only to run into problems a few weeks later when it stops cooling,” said Nou Vang, co-founder of Mechanical Air. “A system can pass a basic power test and still have a failing compressor, low refrigerant, or ductwork issues that cost thousands to fix. A specialized HVAC inspection catches those issues before closing.”
Replacing an R22 system can cost $6,000 to $8,000 or more, and emergency HVAC repairs during peak summer or winter months often carry premium pricing. Buyers who skip a dedicated HVAC inspection lose the leverage to negotiate repairs or credits with the seller before the deal closes.
Plumbing Problems
Plumbing issues range from minor leaks to entire system replacements. Leaks that have been active for extended periods cause additional problems, including flooring damage, subfloor rot, and mold growth. Polybutylene pipes were common in construction during the 1980s and 1990s but were banned in 1995 due to a high risk of failure that still affects many older homes.
Most plumbing in a home is hidden under floors or behind walls, making it difficult to inspect thoroughly without invasive testing. Buyers should pay particular attention to visible corrosion, water stains, low water pressure, and drainage issues during walkthroughs. Professional plumbing assessments are often warranted when inspectors note concerns, particularly in homes over 30 years old.
Water Damage and Mold
Water damage affects all parts of a home and, if left unchecked, leads to significant structural repairs. Water intrusion can originate from roofing failures, plumbing leaks, poor exterior drainage, or foundation cracks. Once water enters, it causes wood rot, compromises structural integrity, and creates conditions where mold thrives.
If moisture, standing water, or dripping is visible in crawl spaces or basements, professional remediation is usually required. Water damage can be the most expensive issue a home inspection uncovers because the damage compounds over time and often extends far beyond the visible problem area.
Pest Infestations
The presence of termites, carpenter ants, rodents, or other pests is not just a maintenance issue; it is a structural and health concern. Termite damage remediation costs between $1,000 and $10,000, depending on severity, and active infestations can make a property uninsurable until treated.
Pest problems contaminate food preparation areas, damage wooden structural elements, and indicate that the home has entry points allowing wildlife to access interior spaces. Buyers discovering active infestations during inspection typically require the seller to provide proof of professional treatment and warranties covering future infestations before proceeding with the purchase.
What Buyers Can Do
The pattern across all these deal breakers is the same: problems that are expensive to fix, difficult to detect without professional evaluation, and capable of affecting the safety, insurability, or financing of the property.
The most effective approach is to treat inspections as sources of information rather than obstacles to overcome. Buyers in 2026 have more negotiating power than in recent years due to increased inventory and more selective purchasing behavior. In 2025, 46% of buyers used inspection results to negotiate repairs or credits, and that number is expected to climb as buyers continue to prioritize due diligence over speed.
Home inspections cost an average of $343 nationally, with most buyers paying between $296 and $424. Specialized inspections for HVAC systems, roofing, structural issues, and pest activity add to that cost but provide leverage that often pays for itself several times over during negotiations.
Sellers who refuse to negotiate on serious inspection findings increasingly see buyers walk away. Redfin data shows that inspection or repair issues were among the leading causes of failed home sales in 2025, and buyers are no longer willing to absorb major unexpected costs simply to close a deal.
For buyers, the lesson is clear: invest in thorough inspections, negotiate from a position of information, and do not hesitate to walk away when the numbers do not work. The cost of a detailed inspection is negligible compared to the cost of inheriting someone else’s deferred maintenance.
