For many homeowners, the basement is an out-of-sight, out-of-mind space. It's where holiday decorations, old furniture, and forgotten boxes end up, alongside appliances that often go unchecked until something goes wrong.
Unfortunately, that habit has consequences. Basements are especially prone to hazards, including excess moisture, fire and carbon monoxide risks, and pest infestations. To figure out what actually makes basements dangerous—and what to do about it—Dan DiClerico, director of the Home Improvement & Outdoor Lab, shared his advice on tackling potential problems. Keep these hazards in mind before an issue arises.
Clutter
"Basements are one of those catchall areas in the home where clutter can really build up," says DiClerico. "That makes the space difficult to navigate, plus clutter is an invitation for pests, and all the health hazards they carry."
Mice, spiders, and insects love dark, undisturbed spaces filled with hiding spots. Regularly decluttering and organizing your basement makes it less attractive to unwanted visitors and easier to use safely.
Moisture
"Since basements are underground, they're a magnet for moisture, which breeds mold, mildew, and other allergens," explains DiClerico. "Running a dehumidifier down there is the fastest fix, though it's important to address the underlying source of the issue."
Often, the problem is poor drainage around foundation walls caused by clogged gutters, he says. Fix the drainage issue outside, and your dehumidifier won't have to work as hard inside.
Flammable items
This one is non-negotiable. "It's very important to never store flammable materials, for example gasoline or paint thinner, in the basement," warns DiClerico. "Not only is it a major fire hazard, the fumes from these materials are toxic."
Find a proper storage location—like a detached shed or well-ventilated garage—for anything flammable.
Carbon monoxide
"If your basement contains gas-fired appliances, like the water heater or dryer, it's very important to install CO detectors down there, so you'll be alerted to carbon monoxide leaks," says DiClerico.
Carbon monoxide is odorless, colorless, and deadly. "Without the detectors, you won't know if a potentially deadly leak has occurred," he explains. This is a cheap, easy safety measure that could save your life.
Leaks
"Given the prevalence of water in basements, it's a good idea to place WiFi-connected leak detectors down there," says DiClerico. "In the event of a leak, you'll receive an alert on your phone so you can address the issue before it turns catastrophic."
Water damage can escalate quickly—especially when you're not checking the basement regularly. Smart leak detectors give you early warning before a small drip becomes a major flood.
Stale air
Stagnant air in basements doesn't just smell bad—it can trap harmful particles and gases. If your basement has windows, open them periodically to let fresh air circulate. If not, consider installing an exhaust fan or air purifier.
Poor ventilation allows mold spores, radon, and chemical fumes from stored materials to accumulate. Improving airflow helps protect both your basement and the air quality in the rest of your home.
Trip hazards
Basements are already prone to being dark and cramped. Add boxes, storage bins, and low ceilings to the mix, and you've got a trip-and-fall hazard waiting to happen.
Make sure pathways are clear and install adequate lighting—especially on staircases. Motion-sensor lights are a smart upgrade that ensures you're never navigating the basement in the dark.
Radon
Radon is a naturally occurring radioactive gas that seeps into homes through foundation cracks, and basements are the most vulnerable. It's odorless and invisible, but long-term exposure significantly increases lung cancer risk.
Testing is simple and inexpensive—radon test kits are available at hardware stores. If levels are high, mitigation systems can reduce radon to safe levels. Since you can't see or smell it, testing is the only way to know if your basement has a radon problem.
Noah Cortez is a Brooklyn-based writer and editor writing about
travel, culture, food, and lifestyle. Prior to this, he was a social media
editor at GQ Magazine, Complex, and Conde Nast Traveler, and his writing
has been featured in Tripadvisor, Hotels Above Par, Conde Nast Traveler,
and more. Find out more at noahcortez.com.
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