Cages and accessories for birds can be quite elaborate, however, the most important feature for allergy sufferers is that they are easy to clean and disinfect. Since many birds love to climb and to chew, stainless steel cages are best because they're virtually indestructible. Birds have vastly different space needs: be certain that the cage you choose is large enough for your bird or birds to stretch their wings without touching the sides and to move freely about without being obstructed in any way. Stainless steel is rust resistant and very durable.
If you want a cage you will never have to replace you must buy a stainless steel bird cages.
