Short answer
Choose a tall, ventilated enclosure with usable climbing space. The RSPCA gives an adult minimum of about 18 × 18 × 24 inches; ReptiFiles recommends 18 × 18 × 36 inches for juveniles and adults over 12 g. These are different recommendations, not interchangeable standards. Plan for the taller option where possible, and fill the height with secure branches and leafy retreats.
Compare the recommendations
The RSPCA specifies at least 45 cm wide, 45 cm deep and 60 cm tall for an adult, approximately 18 × 18 × 24 inches. It also emphasizes ventilation.1 ReptiFiles sets its baseline at 18 × 18 × 36 inches for animals over 12 g, reserving a 12-inch cube for smaller hatchlings.2
Read dimensions in their stated order. On a shopping page, verify which number is height before comparing the enclosure with a guide.
Make the height usable
An empty tall box provides little climbing space. ReptiFiles explains that crested geckos travel horizontally as well as vertically.2 Sketch where the animal can rest, cross between branches and reach its food. Check that the design leaves both open routes and sheltered places.
Before buying, ask:
- Can branches be secured at different levels?
- Can you reach the feeding ledge and water dish for cleaning?
- Will foliage provide cover without blocking every route?
- Can you inspect the animal without dismantling the enclosure?
These questions are a planning checklist, rather than extra dimension standards.
Choose the location before the furniture
The RSPCA advises keeping the enclosure away from direct sun, drafts and heat sources.1 Measure the available space with the doors open and allow access above the lid for the equipment you intend to use. A terrarium that fits a shelf but cannot be opened or serviced there is a poor fit for that location.
Housing animals together
Our starting recommendation is one gecko per enclosure. ReptiFiles does not endorse cohabitation because of fighting, injury and competition risks.2 Extra volume should not be treated as a guarantee that animals will get along.
Finish the setup plan with the temperature guide, humidity guide and full care guide.
Common questions
Is 18 × 18 × 24 inches enough for an adult?
It matches the RSPCA minimum after rounding its metric dimensions. ReptiFiles recommends a taller 18 × 18 × 36 inch enclosure. Consider the usable climbing space, ventilation and access to food as well as the outside dimensions.
Can a crested gecko live in a long, low tank?
A tall enclosure better supports this climbing species. A low tank can offer floor area while leaving too little vertical room for branches and retreats.
Sources
Numbers in the text link to these sources. We checked each one on the date shown.
- 1Caring for your Crested GeckoRSPCA. Checked Oct 30, 2026.
- 2Crested Gecko Enclosure Size & CohabitationReptiFiles (specialist keeper guidance). Checked Oct 30, 2026.
Update history
- : First published; compared the RSPCA and ReptiFiles enclosure recommendations.
HerpWise Editorial · About the author and review process
HerpWise Editorial summarizes published veterinary, welfare and specialist care guidance. The sources and check date are listed on each guide. Veterinary review is credited separately when completed.
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