How big a coop do you need?
Crowding is behind most backyard-flock problems - pecking, disease and stress all start in a coop that is too small. Pick your bird and how many you keep, and we'll size the coop floor and the run, with a little room to breathe built in.
Coop floor space 24 sq ft about 2.2 m²
Run / outdoor space: at least 60 sq ft (about 5.6 m²).
A coop around 5 × 5 ft would do it.
⚠️ These are sensible minimums with a little headroom - more is always better, and birds that free-range part of the day are happier still. Numbers assume standard adults; heavy or flighty breeds, hot climates and birds kept in full-time need more. Vertical roosts and nest boxes are extra to the floor space above.