Keeping lizards away from your home comes down to making the space less appealing to them: reducing the insects they feed on, blocking their entry points, and using repellents that irritate their senses without poisoning anything. Most house lizards, especially geckos, are drawn to buildings because of warmth, shelter, and the steady buffet of bugs that gather near lights. The methods that actually work range from simple habitat changes to plant-based sprays and even acoustic devices, though the science behind each varies in strength.
Why Lizards Move Into Your Home in the First Place
Understanding what attracts lizards is the most practical first step, because removing the attractants is almost always more effective than chasing individual animals out. The common house gecko, Hemidactylus frenatus, is the species most people are dealing with. Research in tropical Australia found that these geckos are abundant around both lighted and unlighted buildings but rarely found in the surrounding bushland, which tells you something important: buildings themselves are the draw, not just the porch light.1Austral Ecology. Interactions between native and invasive gecko lizards in tropical Australia The structure offers crevices to hide in during the day, warmth radiating from walls and roofs, and a reliable insect supply.
Insects are the big one. Outdoor lights attract moths, beetles, mosquitoes, and flies, and lizards follow the food. If your exterior is well-lit at night, you are essentially running a 24-hour restaurant for geckos. Indoor lights visible through windows or gaps pull bugs inside, and lizards follow them through any crack they can squeeze through. A gecko’s body is remarkably flexible, and some species can fit through gaps barely wider than their skull.
Before You Evict Them, Consider What They Do for You
This is worth pausing on, because many people trying to get rid of lizards would actually benefit from keeping them around. House geckos are voracious insect predators. A dietary study of H. frenatus found that their gut contents were dominated by insects from groups that include grasshoppers, beetles, flies, ants, and moths. Roughly 39% of the insects they consumed were species harmful to crops, fruits, and vegetables, while another 20% were plant-damaging species and about 7% were household pests.2Bangladesh Journal of Zoology. Gut contents of common house gecko, Hemidactylus frenatus (Schlegel, 1836) in Jahangirnagar university campus, Savar, Bangladesh
Their appetite for mosquitoes is particularly striking. In laboratory experiments, individual geckos consumed between 63 and 109 mosquitoes per day, with a clear preference for female mosquitoes over males.3PubMed. The gecko: an environmentally friendly biological agent for mosquito control Female mosquitoes are the ones that bite, so geckos are selectively removing the mosquitoes that matter most to your comfort and health. If you live somewhere with dengue, Zika, or malaria risk, a few house geckos on your walls may be doing more for you than a can of bug spray.
The honest calculation: if you find lizards mildly annoying but tolerable, leaving them alone is probably the best pest-management decision you can make. The rest of this article is for people who genuinely need or want them gone.
Habitat Modification and Sealing Entry Points
The most durable way to reduce lizard presence indoors is to change the environment so it no longer meets their needs. This is less dramatic than spraying repellents, but it lasts longer and has no chemical downsides.
- Switch exterior lighting: Replace white or warm-toned outdoor bulbs with yellow or sodium-vapor lights, which attract far fewer insects. Motion-activated lights that only turn on when someone walks by will also cut down on the all-night insect gathering that feeds lizards.
- Seal gaps and cracks: Inspect door frames, window frames, utility entry points for pipes and cables, and the gaps where the roof meets the walls. Caulk, weatherstripping, and fine mesh screens over vents can close off most entry routes. Pay special attention to areas near exterior lights, where insects and lizards both concentrate.
- Remove clutter near walls: Stacked firewood, piles of garden debris, and dense vegetation pressed against the house all create hiding spots that lizards use as staging areas before entering. Pull storage at least a foot or two from the building’s exterior.
- Control indoor insects: If you reduce the insect population inside your house, lizards have less reason to be there. Fix dripping taps that attract cockroaches, store food in sealed containers, and empty trash regularly. A cleaner kitchen does more lizard deterrence than most sprays.
None of these steps will produce overnight results, but together they make your home a less rewarding place for a lizard to live. Over a few weeks, you should notice fewer sightings as the animals shift to easier hunting grounds.
Natural Plant-Based Repellents
Essential oils and plant extracts are the most common “natural” approach people try, and there is some laboratory evidence behind a few of them, though the real-world effectiveness is usually weaker than what the packaging promises.
Kaffir lime peel extract has been tested specifically as a lizard repellent. At concentrations of 50% and above, the essential oil from kaffir lime peel caused visible discomfort in lizards, making them avoid treated areas.4IOP Conference Series: Materials Science and Engineering. A Novel Green Technology Kaffir Lime Extract as Lizard Repellent That is a fairly high concentration, which means a light spritz of diluted lime oil probably will not do much. You would need a relatively strong solution applied directly to surfaces where lizards travel.
Other essential oils have been studied more extensively as reptile irritants, though much of this research was conducted on snakes rather than lizards. Cedarwood, cinnamon, sage, juniper berry, lavender, and rosemary oils all provoked strong avoidance behavior in brown treesnakes when delivered as aerosols.5PubMed. Aerosolized essential oils and individual natural product compounds as brown treesnakes repellents Whether the same oils work on geckos and other common house lizards is less well documented, but anecdotal reports and some preliminary research suggest that peppermint, clove, and eucalyptus oils have moderate repellent effects on lizards as well. A review of both chemical and herbal repellent approaches found that herbal repellents, including essential oils like peppermint, clove, eucalyptus, and garlic extracts, showed moderate to high repellency in controlled studies, in the range of 60 to 85% effectiveness.6Journal of Silk. From Chemicals to Nature: A Critical Review on the Evolution of Lizard Repellents for Indoor Environmental Control
The practical limitation of plant-based repellents is that they evaporate quickly. You will need to reapply every day or two, especially outdoors or in well-ventilated areas. Soaking cotton balls in peppermint or eucalyptus oil and placing them near entry points is a common approach. Some people mix 10 to 15 drops of essential oil with water in a spray bottle and mist door frames, window sills, and baseboards. These methods are safe around most pets and children in the concentrations typically used, though cats are more sensitive to essential oils than dogs, so keep concentrated oil away from areas where cats groom themselves.
Chemical Repellents and Their Trade-Offs
Commercial lizard repellents often contain naphthalene, phenyl compounds, or synthetic pesticides. In laboratory settings, these products can achieve 85 to 100% repellency and tend to last longer than herbal alternatives, persisting for days or even weeks between applications.6Journal of Silk. From Chemicals to Nature: A Critical Review on the Evolution of Lizard Repellents for Indoor Environmental Control That persistence comes with a cost. Naphthalene, the active ingredient in many mothball-based repellents, is a possible human carcinogen and is toxic to pets. It releases fumes that can cause headaches, nausea, and respiratory irritation in enclosed spaces. Using mothballs as lizard repellents in living areas is a bad idea, even though the internet recommends it constantly.
Synthetic pesticide sprays designed for crawling insects will kill lizards if they contact them directly, but this creates a different problem. Lizards that ingest poisoned insects or absorb pesticides through their skin can carry those toxins into the broader food chain. If your cat catches and eats a poisoned gecko, the toxin transfers. And wiping out lizards while leaving the underlying insect problem unsolved just means you now have more bugs and no natural predators handling them.
If you decide to use a commercial product, look for formulations specifically labeled as lizard repellents rather than general pesticides. Apply them outdoors along perimeter walls and entry points rather than indoors, and follow the label directions on ventilation and reapplication. The gap between lab effectiveness and real-world results tends to be wider for chemical repellents than for any other category, because lab tests use enclosed chambers where the animal cannot simply walk to an untreated area.
Using Temperature to Your Advantage
Lizards are ectotherms. Their body temperature tracks their environment, and their activity level drops dramatically when it gets cold. The common house gecko stops feeding altogether when ambient temperature drops below 17°C (about 63°F), and persistent cool nighttime temperatures appear to limit where the species can survive long term.7PubMed. Temperature, field activity and post-feeding metabolic response in the Asian house gecko, Hemidactylus frenatus
This has practical implications if you live in a climate where air conditioning is common. Keeping indoor temperatures on the cooler side, especially at night, makes your home less attractive to geckos. You do not need to freeze yourself out; even dropping to the low 60s Fahrenheit overnight can discourage lizards from setting up permanent residence. They will seek warmer spots elsewhere, which usually means heading outdoors or to a neighbor’s warmer house.
Conversely, if you keep your home toasty warm year-round and live in a tropical or subtropical area, you are essentially offering lizards ideal habitat. Adjusting your thermostat is not always practical as a standalone strategy, but combined with sealing entry points and reducing insect food sources, cooler indoor temps push the balance further in your favor.
Sound-Based Deterrents
Acoustic repellents are a newer and somewhat surprising approach. Researchers tested sound-based deterrents on green anoles, an invasive lizard species, and found that a mixture of artificial machine sounds and biological sounds (like predator calls) prevented lizards from approaching a speaker in roughly 80% of trials when the lizard was within about 24 centimeters. The mixed sound maintained its deterrent effect at greater distances too, up to about 72 centimeters, while purely artificial sound lost effectiveness at that range.8Ecological Research. A mixture of artificial and biological sounds improves the effective range of an acoustic repellent for an invasive lizard species
The effective range here is modest. You would need speakers positioned close to the areas you want to protect, and even then the deterrent zone extends less than a meter. This is not yet a practical whole-house solution, but the concept is interesting for targeted protection of specific spots, like a particular shelf or equipment area where lizard droppings are a problem. Commercial ultrasonic pest repellers marketed for lizards exist, but most have not been tested in peer-reviewed studies, and the evidence for ultrasonic devices in general pest control is weak. If you try one, keep expectations low.
Humane Trapping and Relocation
If you have a specific lizard living in your kitchen and you want it out now, the simplest method is a manual capture. Most house geckos can be guided into a jar or plastic container by slowly approaching from one side and gently nudging them toward the opening. Placing the container over the lizard against a flat surface, then sliding a piece of cardboard underneath, works well. Release the lizard outside, ideally near a wall or fence where it has immediate cover, and at least 20 to 30 meters from your house so it does not walk right back in.
Sticky traps, sometimes sold for insect control, will catch lizards but pose serious welfare concerns. A lizard stuck to a glue trap will struggle for hours, potentially tearing its skin, losing its tail, or dying of dehydration. If you use sticky traps for insects and accidentally catch a lizard, you can free it by carefully applying vegetable oil around the stuck body parts to dissolve the adhesive. Most pest-control professionals and wildlife organizations discourage glue traps for reptiles.
For larger infestations or lizards in hard-to-reach spaces like wall cavities, funnel traps and pitfall traps have been used in wildlife management, though these are more commonly tools of researchers than homeowners. A simpler approach for wall-cavity lizards is to locate and seal their entry point while they are out foraging at night, which is when most geckos are active.
Legal Protections You Might Not Expect
Before you get aggressive about removing lizards, check your local regulations. Many people are surprised to learn that lizards are legally protected in some jurisdictions, and harming or killing them can carry real penalties. In New Zealand, for example, all native lizards have been legally protected since the early 1980s, with protections strengthened again in 1996.9Tuhinga. Legal protection of New Zealand’s indigenous terrestrial fauna – an historical review Handling, capturing, or killing native lizard species without a permit is illegal there, even if the lizard is in your house.
New Zealand is not unique. Parts of Australia, India, and several European countries protect certain lizard species under wildlife conservation laws. In the United States, regulations vary by state: most common house geckos are non-native and unprotected, but native species like certain skinks, fence lizards, and glass lizards may be covered under state wildlife codes. The distinction between a native species and an introduced one matters legally, and most homeowners cannot reliably tell the difference.
The safest approach is to use non-lethal deterrence and exclusion methods. These are legal everywhere and avoid the risk of accidentally killing a protected species. If you are dealing with a large population and want to take more active measures, a quick call to your local wildlife agency can clarify what is allowed in your area.
Common Approaches That Do Not Actually Work
A few popular home remedies deserve a reality check. Eggshells placed near doorways are widely recommended online, based on the theory that lizards mistake them for predator eggs and flee. There is no scientific evidence for this. Lizards have good vision and would not confuse a broken eggshell with a threat. Peacock feathers supposedly scare geckos because peacocks eat lizards in the wild. While peafowl do eat small reptiles occasionally, a stationary feather is not going to fool a gecko that has already figured out how to live on your ceiling.
Tobacco and coffee grounds are sometimes suggested as lizard poisons. These are genuinely toxic to lizards if ingested in sufficient quantities, but they are also toxic to pets and children, and deliberately poisoning wildlife is illegal in many places. Garlic cloves and onion slices placed around the house smell unpleasant to humans long before they deter a lizard, and the odor dissipates quickly. If you want a scent-based repellent, the essential oils discussed earlier have more evidence behind them and can be applied in a more controlled way.
Electronic electromagnetic pest repellers, the plug-in devices that claim to drive away all pests by emitting electromagnetic fields through your home wiring, have been repeatedly tested and found ineffective against insects, rodents, and reptiles alike. The Federal Trade Commission in the United States has taken action against companies making unsupported claims for these devices. Save your money.