A properly designed secure enclosure may give an indoor cat access to fresh air, sights and smells while limiting some risks of free roaming. Suitability depends on the construction, access arrangement and the cat's response. Check openings, roof security, door management and any routes through which a cat could squeeze or become trapped. Provide shade, weather protection and a way to retreat indoors or to a comfortable sheltered area. Platforms need suitable dimensions and load support, just as indoor furniture does.
Do not assume an ordinary garden run or balcony screen is secure enough without checking its design. Introduce the space gradually and supervise while you learn how the cat uses it. If you rent or live in a shared building, check permissions before installation. The enclosure should add useful choice rather than become a place where the cat is shut away. Check how people will enter without creating an escape opening, and include access for cleaning the furthest corners in the design.
For product comparisons alongside this advice, see Paw-Villian cardboard scratcher and Mouse Chase play set. The details below explain their sizes and uses.
Further reading: rspca.org.uk; cats.org.uk; pdsa.org.uk; pdsa.org.uk.
Paw-Villian cardboard scratcher
Mouse Chase play set
Koda Pod