8 Home Buying Red Flags to Watch for Before Purchasing a House

Buying a home is a major investment, so knowing the home buying red flags to watch for can help you make a more informed decision. While fresh paint, stylish staging, and updated finishes can make a property feel move-in ready, they may also distract from costly issues hiding underneath the surface.

In this Redfin guide, we’ll explore the most common warning signs to look for when touring a home and share expert advice on what they could mean for your purchase. Whether you’re house hunting in Denver, CO or buying a home in Tampa, FL, these tips can help you look beyond the surface and approach your next home purchase with greater confidence.

In this article:
1. Cracks in the foundation or signs of movement 
2. Signs of water damage or poor drainage 
3. A roof or major home system nearing the end of its life 
4. Fresh paint or patchwork in suspicious places 
5. Strong fragrances or too many air fresheners 
6. The home was previously under contract and returned to the market
7. Renovations that may not have been permitted
8. A home that looks like a rushed flip
Home buying red flags to keep in mind before you buy

1. Cracks in the foundation or signs of movement 

Foundation issues can be expensive to repair, so buyers should pay attention to cracks and other signs of movement during a home tour. While some cracks are harmless, issues like sticking doors, uneven floors, or gaps around frames can warrant a closer look from a professional inspector.

“One major red flag is seeing signs of deferred maintenance, such as cracked foundations or neglected roofs, which can signal expensive underlying issues,” states Liz Rossof at Denver Nook. “Ensure you work with a broker who will account for these items in the purchase price and secure seller credits or repairs before closing. Don’t worry if you cannot identify these issues yourself, these are what your inspector will be looking for and will bring up in their report.” 

When touring a home, look for:

• Cracks that are widening, horizontal, diagonal, or stair-step shaped.
• Doors or windows that stick, rub, or no longer close properly.
• Uneven, sloping, or sinking floors.
• Gaps between walls, ceilings, floors, or door frames.
• Signs of water intrusion near foundation cracks.

2. Signs of water damage or poor drainage 

Water damage can be easy to overlook during a home showing, especially when fresh paint and staging make a property look move-in ready. If you notice signs of water intrusion, ask questions about when and how the issue was addressed, and let your home inspector investigate further before moving forward.

“When house hunting, look beyond fresh paint and staging and pay close attention to signs of water intrusion, foundation movement, poor drainage, or neglected roofing, HVAC, plumbing, and electrical systems,” recommends Frank Albert. “A seller’s refusal to share an inspection report they actually received can be a red flag, although buyers don’t always provide their reports to the seller, so the absence of one alone isn’t necessarily cause for alarm.”

Look for:

• Water stains or discoloration on ceilings, walls, or baseboards.
• Musty or damp odors, particularly in basements, closets, or crawl spaces.
• Bubbling, peeling, or freshly painted areas that may conceal previous damage.
• Warped, buckled, or uneven flooring.
• Standing water or poor grading around the home’s foundation.
• Gutters or downspouts that don’t appear to direct water away from the home.

3. A roof or major home system nearing the end of its life 

A home’s roof, HVAC, plumbing, and electrical systems can continue working even when they’re nearing the end of their useful life. Before buying, ask about the age, maintenance history, and condition of these major systems so you can budget for potential repairs or replacements rather than being caught off guard.

Keep an eye out for:

• An older roof with missing, curling, or damaged shingles.
• HVAC equipment that is aging, poorly maintained, or struggling to heat and cool the home evenly.
• Outdated electrical panels, wiring, or other electrical components.
• Older plumbing or signs of leaks and corrosion.
• Missing maintenance records or little documentation about past repairs.

4. Fresh paint or patchwork in suspicious places 

Cosmetic updates can make a home feel fresh and move-in ready, but buyers shouldn’t let them distract from the property’s overall condition. During a showing, take a moment to compare finishes throughout each room and note anything that looks recently repaired or inconsistent with the surrounding surfaces.

“Inside, buyers should look for a single wall with fresh paint or obvious patch work that is newer than everything around it,” says Derek Earley at Staging OC. “These may be attempts to cover damage or an unpleasant odor.”

Look around for:

• Paint colors or textures that don’t match.
• Uneven surfaces or visible patches.
• Peeling, bubbling, or warped areas.
• Repairs concentrated around windows, ceilings, or exterior walls.

If you notice an area that seems unusual, ask about the repair and have your inspector investigate it during the inspection.

5. Strong fragrances or too many air fresheners 

A home that smells overwhelmingly fresh can be worth a closer look. While scents may simply be part of the seller’s cleaning routine, unusually strong fragrances throughout the property can sometimes indicate an attempt to cover up a lingering odor or another issue.

“When house hunting, there are a few red flags I always tell my buyers to watch for. A home that smells overly fresh or has an unusual number of air fresheners running is one of them,” states Corina Lessa, president of Suncoast Tampa Association of REALTORS. “Sometimes it is innocent, but strong fragrances can also be masking pet odors, smoke, or moisture problems underneath.”

Pay attention to:

• Air fresheners or plug-ins in nearly every room.
• Strong candles, sprays, or other fragrances.
• Noticeably different smells from room to room.
• Musty, smoky, pet, or damp odors underneath the fragrance.

6. The home was previously under contract and returned to the market

A home returning to the market after going under contract isn’t necessarily a sign that something is wrong, but it is worth finding out why the previous deal fell through. Financing, appraisal issues, inspection findings, or disagreements over repairs can all cause a contract to end, so ask the listing agent for more details before making an offer.

Ask questions such as:

• Why did the previous contract fall through?
• Did the buyer complete a home inspection?
• Were any major repairs or issues identified?
• Did financing or the appraisal play a role?
• Has the seller made any repairs or changes since the previous listing?

7. Renovations that may not have been permitted

A beautifully renovated home can be appealing, but buyers should find out whether major improvements were completed with the proper permits. Unpermitted work can create safety, financing, insurance, and resale concerns, so it’s worth verifying the home’s permit history before closing.

“Do not let a beautifully updated surface distract you from the basics,” declares Corina Lessa at Suncoast Tampa Association of REALTORS. “Water stains, cracks, an aging roof or HVAC system, or renovations that may have skipped permits are all things a licensed inspector should be checking during your due diligence period.”

Some things to inquire about: 

• Finished basements, attics, or garages that appear to have been converted into living space.
• Additions or newly enclosed rooms that don’t appear in property records.
• Recent electrical, plumbing, structural, or HVAC work with no permit documentation.
• Renovations that look significantly newer than the rest of the home.

8. A home that looks like a rushed flip

A recently renovated home isn’t automatically a bad investment, but buyers should look beyond the new finishes to determine whether the work was done thoughtfully. Rushed renovations can prioritize cosmetic updates while leaving older systems or underlying problems untouched, making a professional inspection especially important.

“Be wary of homes that appear to have been quickly flipped with cosmetic updates,” states Liz Rossof at Denver Nook. “Be sure your agent and inspector know how to see the difference between a fix and flip, and a fix and flop.”

Don’t overlook:

• New finishes paired with an aging roof, HVAC, plumbing, or electrical system.
• Uneven flooring, sloppy grout, or misaligned cabinets.
• Doors, drawers, or fixtures that don’t sit or operate properly.
• Missing information about what was renovated, who completed the work, or whether permits were obtained.

Home buying red flags to keep in mind before you buy

Spotting home buying red flags early can help you avoid costly surprises and make a more confident purchase. With a thorough inspection, thoughtful questions, and guidance from trusted professionals, you can look beyond a home’s surface and make an informed decision about whether it’s the right fit for you.

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