Which terrarium for a leopard gecko or a bearded dragon? Size, glass or OSB
Choosing the terrarium is the very first decision a beginner reptile keeper makes, and arguably the most consequential: it determines the heating, the lighting and the animal’s wellbeing for the next ten to fifteen years. Yet leopard geckos and bearded dragons have very different needs, and there is no such thing as a one-size-fits-all enclosure. Here is how to decide, with dimensions and materials to back it up.
Minimum dimensions by species
The leopard gecko is a modestly sized, ground-dwelling, crepuscular lizard. For a single adult, the common recommendation is a terrarium of at least 80 × 40 × 40 cm, with length mattering more than height. The bearded dragon, larger and far more active, needs considerably more room: aim for 120 × 60 × 60 cm minimum for an adult. A juvenile can start out in something smaller, but buying the adult size straight away spares you a second purchase and a stressful move.
Glass versus OSB: the real match-up
Glass terrariums, such as those made by Exo Terra, offer excellent visibility, clean easily and stand up well to humidity. Their weakness is insulation: in a cool room, the heating bill climbs. OSB terrariums (wood panels with a glass front) hold heat far better, a genuine asset for a bearded dragon that needs a 40 °C basking spot. Their downsides: extra weight, and the need to seal the interior with a suitable varnish to protect it from moisture.
- Glass: ideal in a heated room, easy to maintain, good-looking; expect 100 to 250 € depending on size.
- OSB: better thermal inertia, often cheaper at equal size (80 to 200 €), easy to customise.
- To avoid: fauna boxes and small plastic tubs as a permanent home.
Ventilation, access and security
Low and high vents create an airflow that prevents humidity and odours from stagnating. Favour sliding front glass panels: reaching in from above, as with an aquarium lid, reads to a reptile as a predator attack. Also check that the panels lock properly, especially with an adult bearded dragon, which is surprisingly strong with its snout.
Budgeting for the equipment around the terrarium
The bare terrarium accounts for only half the budget. You will need to add a heating system with a thermostat, suitable lighting — essential for a bearded dragon, see our guide to UVB lamps — plus a safe substrate and hides. Plan an overall envelope of 250 to 500 € for a proper setup.
Our verdict
For a leopard gecko in a heated flat, an 80 to 90 cm glass terrarium is an excellent starting point. For a bearded dragon, OSB at 120 cm and above usually wins thanks to its insulation. Find all our habitat comparisons on the Planète Pets reptile hub and in the bedding and habitat category.
This guide is part of Planète Pets’s Reptiles universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.