Desert gecko vivarium for damp flats

A ground-floor flat with damp walls is one of the trickier environments to keep a desert gecko in — ambient moisture will constantly work against you, so your vivarium needs to be sealed well enough to hold a low internal humidity regardless of what the room is doing. Reptile welfare is almost entirely determined by getting the environment right: temperature gradient, UV lighting, humidity, and substrate all need to match the specific species' natural habitat, and getting this wrong causes chronic stress and illness over time. So — which species of gecko are you keeping, how old is the animal, and are you setting up from scratch or trying to improve an existing enclosure?

Perfect timing to get it right from the start. Leopard geckos need to stay in the 20–30% relative humidity range — your damp walls are going to push the room well above that. What you need is a front-opening glass terrarium with a tight-fitting mesh top and well-sealed glass panels, so you're controlling the internal climate rather than fighting the room. What size space do you have available, and do you have a rough budget in mind?

That's exactly the right mindset. My clear recommendation is the Exo Terra Glass Terrarium 90x45x45cm. It's front-opening with two doors, which matters for a leopard gecko — they're easily startled by movement from above. The glass panels seal well, the ventilation is through a raised bottom and the front lower mesh strip rather than a wide-open top, which gives you much better humidity control than mesh-heavy alternatives. In a damp room that difference is significant. The twin doors also let you service one side without disturbing the whole enclosure. It's a proven, durable kit that won't need replacing, and it's sized correctly for a single adult leopard gecko with room for a proper hide setup and temperature gradient.

The glass does most of the work — unlike PVC or mesh enclosures, it doesn't absorb or pass ambient moisture. But there are two things worth doing on top of that. First, don't position the vivarium directly against an external or damp wall — even a few centimetres of air gap helps. Second, run a small digital hygrometer inside the enclosure so you're measuring the actual internal humidity rather than guessing. If it's creeping above 40% despite the sealed glass, a small packet of reptile-safe desiccant placed out of reach can bring it back down. You shouldn't need a dehumidifier for the whole room, but those three steps together — sealed glass tank, air gap from walls, hygrometer inside — will keep your leopard gecko in a stable, dry environment regardless of what the flat is doing around it.

Yes — avoid anything that holds or releases moisture. Coconut fibre and bioactive substrates are popular but wrong for a leopard gecko in your situation; they'll actively add humidity inside the enclosure. Go with a dry, inert substrate: either slate tile, which is easy to clean and holds belly heat well from your under-tank heater, or a dry reptile sand and soil mix like Arcadia EarthMix Arid, which stays loose and dry and doesn't off-gas moisture. Either works well in a sealed glass setup. The main thing is to keep the moist hide — which leopard geckos do need for shedding — small and contained with a lidded box rather than a large damp area, so the moisture stays localised and doesn't affect the overall enclosure humidity.