Wyandottes are a large, broad-bodied breed, and they need more room than bantams or lighter production breeds. Inside the coop, plan for a minimum of four square feet per bird, though five or more is preferable given their size and the fact that overcrowding is one of the fastest routes to pecking problems, stress-related illness, and reduced egg production. Wyandottes are generally docile, but even calm birds become irritable when packed too tightly.
Outdoor run space should be calculated at a minimum of ten square feet per bird if the flock does not have access to free range. Wyandottes are not strong fliers, so run fencing doesn't need to be exceptionally tall — four to five feet is usually sufficient — but it should be secure against predators. If full free-range access is available during daylight hours, the run can be smaller since the birds will spread out naturally across the yard.
Roosting bar space matters more than many new keepers realize. Wyandottes need roughly ten to twelve inches of roosting bar per bird due to their wide bodies. Bars should be positioned at least two feet off the ground and at the same height to prevent jockeying for the top spot — a behavior that can cause injuries and social stress in an otherwise peaceful flock. Flat or gently rounded bars about two inches wide are better for heavy breeds than narrow dowels, because they allow the birds to settle their keel bone comfortably and fully cover their toes in cold weather.
Nesting boxes should be provided at a ratio of one box for every three to four hens. Each box should measure approximately 14 by 14 inches to accommodate the Wyandotte's larger frame. Placing boxes lower than the roost bars discourages sleeping in them, which keeps the bedding cleaner and the eggs more sanitary.