Top 10 Common Home Inspection Red Flags Every Homebuyer Should Know

The foundation is the backbone of any home. Large cracks in the walls, sloping floors, or doors that don’t close properly can all point to structural issues. These repairs are expensive and often require specialists. If the inspector reports foundation problems, consider it one of the biggest home inspection red flags.



Tip: Small hairline cracks are common and usually harmless, but wide cracks or uneven settling need immediate attention.

Roofs take the brunt of weather in the USA—snow, rain, hail, and strong sun. Missing shingles, leaks, or signs of sagging are red flags that the roof may need repair or replacement soon. A new roof can cost tens of thousands of dollars, so this is something you can’t afford to ignore.



Tip: Ask when the roof was last replaced and check if it’s still under warranty.

Leaky pipes, low water pressure, or signs of water damage can all signal serious plumbing issues. Older homes may also have outdated piping materials like lead or polybutylene, which can fail unexpectedly.



Tip: Look for water stains on ceilings, walls, or under sinks. These are clear signs of hidden plumbing concerns.

Faulty wiring isn’t just an inconvenience—it’s a fire risk. Home inspectors often find outdated electrical panels, overloaded circuits, or exposed wiring. These home inspection red flags are not only dangerous but can also be costly to bring up to code.



Tip: In older homes, ask if the electrical system has been upgraded to handle modern appliances and electronics.

Heating, ventilation, and air conditioning systems (HVAC) keep your home comfortable year-round. If the system is old, poorly maintained, or not working efficiently, you could be facing high repair or replacement costs soon after moving in.



Tip: Ask for service records. Regular maintenance is a good sign the system has been cared for.

One of the most concerning home inspection red flags is water damage. It can weaken the structure and lead to mold growth, which poses health risks. Mold often appears in basements, attics, or around windows where moisture builds up.



Tip: A musty smell is often the first sign of hidden mold. If detected, further testing may be necessary.

If water doesn’t flow away from the home properly, it can pool around the foundation, leading to cracks, leaks, and flooding. Poor grading is a red flag that can cause long-term damage if not addressed.



Tip: Check the yard after heavy rain. Standing water near the house is a bad sign.

Termites, carpenter ants, and rodents are not just annoying—they can cause major structural damage. Evidence of pests, such as droppings, chewed wood, or hollow-sounding beams, should never be ignored.



Tip: A separate pest inspection may be needed to fully assess the situation.

In older homes, materials like asbestos and lead paint are common. Radon, a naturally occurring gas, can also seep into homes and cause health issues. These hazards may not always be obvious, but they are serious red flags.



Tip: Ask about environmental testing results if you’re buying an older property.

Not all home upgrades are done professionally. Sloppy wiring, uneven flooring, or poorly installed plumbing are signs of bad DIY work. These problems may not only look bad but can also be unsafe.



Tip: Look for permits on major renovations. This helps confirm that upgrades were inspected and approved.