Crested gecko enclosure setup: height, heat and humidity

The crested gecko is one of the most popular beginner reptiles, yet one setup mistake comes up again and again: buying equipment from a leopard gecko guide. The two species need almost opposite conditions. Leopard geckos live on dry ground and want warmth; crested geckos climb trees in the humid forests of New Caledonia and cope poorly with heat. Below are the dimensions, temperatures and equipment step by step, as given by veterinary and welfare sources. For more about the species itself, see our crested gecko profile.

How big should a crested gecko enclosure be?

Crested geckos are arboreal, so height matters more than floor space. The UK's RSPCA gives a minimum for one adult of 45 cm wide, 45 cm deep and 60 cm tall. PetMD gives a minimum of 20 gallons for a single gecko and stresses that the enclosure should be tall, because height is more important than floor area.

At Živalce.si we recommend 45 × 45 × 90 cm for an adult. The extra height leaves room for branches at several levels and a bigger difference in temperature and light between the top and the bottom, so the gecko can choose where it is comfortable. Hatchlings are more secretive; the RSPCA suggests they can start in a smaller enclosure that is upgraded as they grow.

The RSPCA prefers glass enclosures over wood because of the high humidity this species needs. A mesh top gives good ventilation and keeps the gecko from escaping. Place the enclosure away from draughts, radiators and direct sunlight, all of which change the temperature inside in ways you cannot control.

Temperature: keep it from getting too hot

With most reptiles the worry is too little heat; with crested geckos it is overheating. The RSPCA recommends a basking zone of 26–28 °C, 20–24 °C at the coolest end, and a safe night-time drop to 18–20 °C. A 2016 reptile lighting review in the Journal of Zoo and Aquarium Research lists a maximum basking temperature of 28 °C for the species.

A laboratory study at California State University, Fresno (2020) found that crested geckos given a choice kept their body temperature between 24 and 28 °C. PetMD is stricter still: it puts the warm side at 72–75 °F (22–24 °C) and warns that crested geckos are prone to overheating and should never spend long periods above 80 °F (about 27 °C). The practical rule: keep most of the enclosure between 20 and 27 °C, and never above 28 °C under the heat source.

In a heated home, room temperature is often close to enough on its own. Summer is the real risk – in a top-floor flat or next to a sunny window the enclosure heats up quickly, so check it more often in hot weather and switch the heater off when needed.

Which heating should you use?

The RSPCA advises a heat lamp at one end of the enclosure, pointing downwards and placed on a mesh lid or guarded so the gecko cannot burn itself – crested geckos climb across the ceiling of the enclosure too. PetMD adds that at normal room temperature a low-wattage bulb on top of the tank is often enough, with a small ceramic heat emitter added only if the room is colder.

Whatever you choose, every heat source must run on a thermostat – the RSPCA, PetMD and the MSD Veterinary Manual all agree on this. Turn lights off at night; if the room gets too cold, the RSPCA recommends a non-light-emitting heater (a ceramic heater on a dimming or pulse-proportional thermostat, or a heat mat on an on/off thermostat) set to 18 °C. Thermostats are not always accurate, so fit two digital thermometers – one at each end – and check them every day.

What humidity does a crested gecko need?

Sources differ here. The RSPCA gives a baseline of 40–50 % with boosts up to 80 % by misting, while PetMD gives 70–80 % as ideal. They agree on the essentials: measure humidity with a hygrometer and raise it by misting. We therefore recommend a daily swing between roughly 50 and 80 % – mist with clean water in the evening, when the gecko becomes active, and let the surface dry out during the day.

A permanently wet enclosure is not the goal. The RSPCA warns that waterlogged substrate becomes a breeding ground for bacteria that can cause skin and respiratory infections. Too little humidity, on the other hand, causes shedding problems: according to the RSPCA, retained shed on the toes can even lead to the loss of toes, and toe pads can lose their grip.

Crested geckos often drink droplets from leaves, so the evening misting doubles as a drink. Even so, keep a shallow dish of fresh water available at all times, as both the RSPCA and PetMD advise.

Does a crested gecko need UVB?

Crested geckos are active at dusk and at night, so they need only low-level UVB. The Fresno study notes that the species has no special lighting requirements in captivity – so UVB is not a question of survival, but it is now considered good practice, because reptiles use it to make vitamin D3 and absorb calcium.

The RSPCA recommends a medium-output (5–7 %) UVB lamp with a reflector, fitted at the top of the enclosure so that the UV index is about 0.7 in the basking zone and falls to zero in the shade. The 2016 review places the crested gecko in the same range (UVI 0–0.7, "shade-dweller or crepuscular" species). That is why dense planting matters: the gecko must always be able to retreat into shade. Run the light for 12 hours, then 12 hours of darkness – a plug-in timer makes this easy.

UVB output fades before the lamp stops glowing. PetMD advises replacing it every 6 months; the RSPCA says to follow the manufacturer's instructions. Write down the replacement date.

Branches, plants and hides

Crested geckos climb and jump. The RSPCA recommends sturdy branches and vines of safe wood (such as fruit-tree or grapevine branches) and tall, broad-leaved plants that create light and shade. PetMD suggests non-toxic live or plastic plants; silk plants do not hold humidity. For daytime rest the gecko needs hides – the RSPCA mentions half coconut shells or cork bark tubes, and PetMD at least two hides, one at the warm and one at the cool end.

The furnishings are not just decoration. The RSPCA describes floppy tail syndrome: if there is not enough room and support for climbing, the gecko sleeps upside down on the glass, the tail bends over and can become damaged. A dense network of branches and leaves at every height reduces that risk. A study in Scientific Reports (2021) also found that impact forces after a jump are higher on horizontal surfaces than on vertical ones – another reason to fill the space with foliage and branches rather than leave it bare.

Which substrate is suitable?

The substrate should hold moisture. The RSPCA lists coconut fibre (coir) or a specially mixed soil substrate topped with moss or leaves, and suggests considering a bioactive setup for permanent housing. PetMD adds damp sphagnum moss, recycled paper pellets and reptile carpet. PetMD advises against gravel, wood chips and walnut shells because they are indigestible, and the MSD Veterinary Manual warns that reptiles often swallow gravel, which can block the gut. For the same reason the RSPCA suggests offering live insects in a dish or a separate enclosure.

The most common mistakes

• Too hot – setups for leopard geckos or bearded dragons are far too warm for this species.
• A low, horizontal tank – not enough room to climb.
• Constantly wet substrate – humidity should rise and fall, and the substrate must never be waterlogged.
• A heater without a thermostat or an unguarded lamp – a burn risk.
• Two males together – the RSPCA and PetMD warn that males fight; a crested gecko is best kept alone.
• Picking it up by the tail – crested geckos can drop their tail and, unlike many other geckos, cannot regrow it.

A crested gecko can live 15–20 years (RSPCA, PetMD), so a good enclosure is worth getting right from the start. See all species under terrarium animals.

When to see a vet

Does a crested gecko need a heater if my home is warm?

Often only a small one. If the room sits at 22–24 °C during the day, a low-wattage lamp on top that creates a warmer spot of up to 28 °C is enough. At night, extra heat is only needed if the temperature falls below 18 °C.

How often should I mist the enclosure?

Usually once or twice a day, ideally in the evening when the gecko is active. Go by the hygrometer rather than a fixed number: humidity should reach about 80 % after misting and then fall towards 50 % during the day.

Is a wooden vivarium suitable for a crested gecko?

Less so than glass. The RSPCA prefers glass enclosures for crested geckos because of the high humidity they need.

Can two crested geckos share an enclosure?

Never two males. The RSPCA says females may be kept together if each has enough hides, basking spots and feeding areas, but also advises that crested geckos are best kept singly. If you see chasing, squeaking, tail waving or biting, separate them straight away.