Our Little Doggy Diggs outdoor kits are pre-designed do-it-yourself dog kennel kits that provide a safe environment for your dog to run, not just dog cages these kits can be configured in a variety of formats to meet your needs.
This is definitely not a cheap route, but it's a "don't have to think about it" route. Habitat Haven designs various outdoor customizable cat enclosures that are shipped as a kit and installed. They're very sturdy and well made.
Outdoor Enclosures for Cats An indoor/outdoor cat can easily be made a totally indoor cat with perseverance on your part. They may resent their confinement for a short time, but they will adjust. (Constructed off back/side patio.
DIY CATIO PLANS - this lady is a genius + even has DIY plans! Even if your neighborhood allows cats outdoors (many do not) we were turned down several shelters b/c we allow our cat outdoors even tho we watched him in the yard they said that's a no no nowa