That's ~11 gal. Recommended size for a Mediterranean house gecko is 20 gal.
Some sources say 10 gal., but I've never been one for minimum sizes when it comes to living arrangements (probably from
living in trying to live in small apartments).
I see they make several in the 18" x 18" x 24" size—over 33 gal.
PT3779
PT2607P2
PT2607
Looking for something closer to 20 gal., I found this
https://www.petsmart.com/reptile/ha...n-terrarium--20-gallon-54738.html?cgid=500118
IDK what else may be out there. Is DIY an option?
Entirely up to you.