A lizard that wanders into your house can survive anywhere from a few days to five years, depending almost entirely on whether it finds food and water inside. If your home has insects and even small amounts of moisture, a common house gecko or similar species can settle in for the long haul. If the lizard is trapped in a dry room with no prey, it will likely survive only two to three days before dehydration becomes critical.
What Determines How Long They Last
Water is the biggest limiting factor. A healthy adult gecko can go roughly two to three days without water before dehydration sets in. That’s the survival clock for a lizard stuck in a sealed room with no moisture sources. But most homes aren’t that dry. Condensation on windows, dripping faucets, pet water bowls, houseplant saucers, and even bathroom humidity all give a small lizard enough to drink.
Food is the second factor, and houses are full of it from a lizard’s perspective. Common house lizards eat spiders, flies, mosquitoes, ants, moths, caterpillars, winged termites, crickets, and just about any crawling or flying insect smaller than themselves. A home with even a moderate number of bugs provides a steady diet. The cleaner your home and the fewer insects present, the faster a lizard will run out of food and either leave or die.
Lizards That Thrive Indoors
The species most likely living in your house is the common house gecko, a small, pale, nocturnal lizard that grows to about five inches long. It’s found across the southern United States, Hawaii, and most tropical and subtropical regions worldwide. Adults live up to five years, and they’re well adapted to human structures. They hunt around porch lights, window frames, and anywhere insects gather at night.
Other species that commonly end up indoors include anoles (the small green or brown lizards common in the southeastern U.S.) and various skinks. Anoles typically live two to five years, while skinks can live longer. Any of these species can take up permanent residence if conditions are right. They’ll tuck themselves behind picture frames, inside closets, under furniture, and in gaps around cabinets or appliances.
Signs a Lizard Has Moved In
You might spot droppings before you see the lizard itself. Lizard droppings are small, dark pellets with a white tip (the white part is uric acid, their version of urine). You’ll find them along walls, on countertops, or behind appliances. You may also hear faint chirping sounds at night, especially from geckos, which are surprisingly vocal for their size. Seeing the same lizard repeatedly in the same area of your home is a strong sign it’s established a territory rather than passing through.
How to Get a Lizard Out
If you want the lizard gone, the simplest approach is to guide it toward an open door or window. Lizards tend to run along walls rather than across open space, so you can often herd one toward an exit by approaching slowly from the opposite side. If you can isolate it in one room, stuff towels under the doors to keep it contained, then open a window.
For a lizard that keeps hiding, a simple bottle trap works well. Cut a plastic water bottle at the point where the neck meets the straight sides. Flip the top piece upside down and fit it back inside the bottle like a funnel. Place it near where you’ve seen the lizard, ideally against a wall. The lizard can crawl in but has difficulty climbing back out through the narrow opening. A small piece of fruit to attract flies, or a live insect if you have one, makes good bait.
You can also catch a lizard by hand using a cup or container. Place the cup over the lizard, then slide a piece of stiff paper or cardboard underneath. Carry the whole thing outside and release it in a sheltered spot near plants or rocks.
Keeping Lizards From Coming Back
Lizards enter homes through surprisingly small gaps: cracks around doors and windows, openings where pipes or wires pass through walls, gaps under doors, and torn window screens. Sealing these entry points is the most effective long-term fix. Weatherstripping, caulk, and door sweeps handle most of the common access points.
Reducing the insect population inside your home removes the main reason lizards stay. Keeping food sealed, cleaning up crumbs, fixing moisture problems, and turning off unnecessary outdoor lights near doors and windows all cut down on the insects that draw lizards inside. Without a reliable food source, a lizard that does get in is far more likely to leave on its own or die within days rather than setting up a permanent home.