Red and Green Flags to Look for During a Home Walkthrough

When buying a home, a walkthrough is one of your first opportunities to spot home issues that could turn into more expensive problems down the road. Knowing what to look for is half of the battle and helps you separate cosmetic issues from serious concerns. Here are some red and green flags that can save you a lot of time, money, and stress before committing to a property.

Signs of Water Damage or Moisture Issues

Water and moisture damage can be hard to catch, especially if it's often covered by fresh paint or new carpeting. Check for warped walls, uneven doorframes, sloped floors, and even damage on the roof for any signs of damage. Damage can also be found in smaller details like creases in the floor, doors not latching properly, and cracks or stains in the foundation. This is important to catch early because it can also lead to molding and more unwanted pests in your home.

Bonus Tip: If you can, try to schedule your walkthrough shortly after a heavy rainfall. Water problems are generally easier to detect when the ground and exterior are still wet. Directly ask the seller if the property has a history of flooding, leaks or mold remediation work.

Cracks in Walls, Ceilings, or Foundation

Not all ceiling and wall cracks are serious, but they can indicate much larger issues. In order, the least to most severe cracks are hairline (cracks no wider than a strand of hair), vertical, horizontal, and diagonal. Hairline and vertical cracks are only moderately dangerous and common in homes in warmer climates, usually caused by temperature or humidity changes. Horizontal cracks and diagonal cracks require the highest level of urgency, no matter the size. These issues are signs of structural damage, faulty construction, or moisture damage, whether from inadequate drainage systems or poor soil compaction beneath the home’s foundation.

Outdated or Unsafe Electrical Systems

Breaker systems are usually the central electrical panel in modern homes, where the fuses and circuit breakers for the whole home can be found. Take note of any visible rust, physical damage, or discoloration on the outside of the electrical system, and ask when it was last replaced, since they typically have a lifespan of 25-40 years, and additional issues can occur if replacement is neglected. To identify functional damage, check for flickering lights, additional extinction cords, or dimming lights when appliances are in use.

Bonus Tip: Bring a phone charger or small device to test outlets around the home during your walk through. It’s also a good idea to ask whether the home has had any recent electrical updates or code violations.

Poor Drainage or Grading Outside the Home

On the outside of a home, drainage problems will be the most apparent during or after a rainfall, making the timing of your walkthrough important. After rainfall, a home’s exterior may have puddles of standing water, patches of land that stay wet for extended periods, dead or unsightly landscaping, or water that flows in the direction of the property. Long-term, these issues can get costly and affect the interior and exterior of your home.

Bonus Tip: Take a walk around the entire perimeter of the property, rather than focusing only on the front yard. Ask about where the rainwater drains during storms, especially if the house is near slopes or low-lying areas.

Signs of Deferred Maintenance

Regular wear and tear on a property is inevitable, but it won’t have the same impact as neglected upkeep—the age of a property should be considered when assessing damage. On the interior, deferred maintenance can show through warning signs on appliances or HVAC systems, exposed wiring, odors, soft or uneven flooring, or unnatural damage that may signal damage beneath the floor. These issues can snowball into bigger issues if they’re left unaddressed, and if you purchase a home without discovering these issues, you’ll likely be responsible for addressing some of these costly repairs, plus finding their root cause.

Green Flags That Signal a Well-Maintained Home

Recent Upgrades or Renovations

Recent updates, especially to larger common spaces, roofs, or HVAC systems, are telltale green flags—they indicate that the home has been prepared with the rightful care, permits, and with longevity in mind, rather than quick fixes to get a sale.

Bonus Tip: Ask whether renovations were completed by licensed contractors and if permits were used for major upgrades. A newly renovated space may look appealing, but poor workmanship can still lead to costly repairs later.

Clean, Well-Kept Interiors and Exteriors

People will always try to make a home look as presentable as possible for a showing or walkthrough, but some key indicators of good maintenance are almost always in the details. Check for genuine cleanliness–baseboards caked in dust, or dirty, hard water-stained faucets are good places to start.

Surprisingly, lightbulbs are also a big tell of proper maintenance; take note of fixtures with different-colored bulbs, or some light being dimmer than others. Look out for the quality of grouting or caulking in bathrooms, and for how cabinets and drawers open and close. Lastly, take a quick snapshot of the exterior on your way in or out–check for the quality of landscaping, attached or overflowing debris in gutters, or cracks in walkways.

Strong Water Pressure and Functioning Systems

In almost any home, you’ll want your water pressure to be between 40 and 80 pounds per square inch (PSI), anything above this is too high, which can be monitored with a pressure gauge. Water pressure is a complicated function of a home, so a healthy PSI can indicate an absence of leaks, clogged pipes, or pressure spikes or drops. Ask detailed questions about water function during your walkthrough, specifically about any pressure fluctuation, preventative measures, maintenance recommendations.

Bonus Tip: Run faucets or flush toilets during your walkthrough to check for any abnormalities in water pressure. Consistent pressure throughout the home is usually a good sign that the plumbing system is functioning properly.

Proper Ventilation and Natural Light

Good airflow and sufficient ventilation can transform a home. Natural light can help open up a space, and make rooms feel more spacious, but also prevents mold growth, and better air quality at home. Natural light and good ventilation can also lead to increased energy efficiency by helping reduce energy usage during the day, and dependency on HVAC systems in peak weather climates.

Proper ventilation and natural light are hard to implement into a home through renovations, so weigh your options if you’re considering a home with these features, taking note of cost efficiency and energy usage.

Organized Documentation from Sellers

Well-organized documentation from sellers is a strong indicator of transparency and responsible ownership. Look for records of past repairs, inspection reports, warranties, and permits for any upgrades or renovations. This level of organization shows that the homeowner has consistently maintained the property and can provide clarity on the home’s history, helping you make a more informed and confident decision.

The Bottom Line

A thorough walkthrough is one of the most important steps in the home-buying process, giving you valuable and important insight beyond surface-level appeal. While red flags discovered during the walkthrough can point to costly or complex issues, green flags offer reassurance that a home has been properly cared for over time. By paying attention to both, you’ll make a more informed decision and move forward with confidence in your investment. Ask as many questions as you can and make a concerted effort to understand every aspect of a property before committing to a purchase.

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