Outdoor Aviaries: Space, Shelter and Safety for Pet Birds

An outdoor aviary gives birds room to fly, fresh air and daylight. It needs a flight at least four times the largest bird's wingspan in each direction, a draft-proof shelter they can retreat to, shade, a safety porch with double doors, and wire that keeps out predators and wild birds. Plan for your coldest and hottest weather.

RSPCA guidance; check details with your avian vet or a specialist keeper.

Aviary basics
Flight size	At least 4× the largest bird's wingspan in height, width and depth
More birds	About 20% more space per extra bird
Shelter	Draft-proof, insulated, safely heated if needed, big enough for all birds
Tropical species	Kept within about 54–79°F (12–26°C)
Shade	At least a third of the outside area
Entry	Safety porch with double doors

Size and Layout

The RSPCA advises an aviary's height, width and depth should each be at least four times the wingspan of the largest bird, with about 20% more space for each additional bird. Long flights matter more than tall ones, because birds fly from end to end.

Perches at each end, leaving open flying space in the middle.
Natural branches of different thicknesses, placed so droppings don't fall on birds, food or water below.
Enough perches for every bird at once.
A floor that's easy to clean, such as slabs or concrete, which also stops rodents digging in.

Shelter and Weather

Every aviary needs an indoor or covered shelter that is draft-proof, insulated and big enough for all the birds in bad weather, with safe heating if your winters are cold. The RSPCA gives about 54–79°F (12–26°C) as the range for tropical and subtropical species, and advises shading at least a third of the outdoor area against sun.

Think about your climate's extremes: frost, heat waves, strong winds and heavy rain. Feed and water inside the shelter so food stays dry and wild birds can't reach it. These figures are typical; check with your avian vet or a specialist keeper for your species.

Predators and Wild Birds

Cats, foxes, raccoons, rats, snakes and birds of prey all target aviary birds, and even a predator outside the wire can cause panic and injury at night. Use strong, small-gauge welded mesh (zinc-free where birds can chew it), bury it or lay a solid floor to stop diggers, and consider a double layer of mesh on the sides most exposed.

The RSPCA also advises keeping wild birds out, because they can carry diseases such as bird flu. A solid or covered roof over part of the aviary and the feeding area helps keep wild bird droppings off. A safety porch with two doors, only one open at a time, stops escapes.

Aviary Kit

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Strong welded mesh, natural perches, covered feeders and a weatherproof shelter are the essentials. A max-min thermometer shows how cold or hot the shelter got overnight, and a heated water bowl stops water freezing in cold climates.

Which Birds Suit an Aviary?

Budgies, canaries, finches, cockatiels and doves are commonly kept in aviaries in mild climates, and the RSPCA notes colony species can live in groups given enough space. Mix species only if they are compatible: lovebirds and parrotlets can attack other birds, and strong fliers may bully birds that can't fly well. Large parrots need specialist aviaries built for strong beaks. Introduce new birds gradually and quarantine newcomers first, as your vet advises.

Bird Flu and Local Rules: They Differ by Country

During bird flu outbreaks, governments may require keepers to house captive birds or follow extra hygiene rules, and these can apply to aviary birds as well as poultry.

United Kingdom: housing and biosecurity measures announced in England have covered all poultry and captive birds; check gov.uk/birdflu, gov.scot, gov.wales or DAERA for current rules.
United States: follow USDA APHIS bird biosecurity advice and your state veterinarian or state department of agriculture.
Elsewhere: check your national agriculture authority, such as CFIA (Canada), DAFM (Ireland), MPI (New Zealand) or your state or territory department in Australia.

Planning or building rules may also apply to large aviaries; check with your local council. See bird flu and pet birds.

Frequently Asked Questions

What people ask before building an aviary.

How big should an aviary be?

The RSPCA suggests at least four times the largest bird's wingspan in height, width and depth, plus about 20% more space for each extra bird. Longer is better than taller.

Can aviary birds stay outside in winter?

Hardy species often can if they have a draft-proof, insulated shelter, heated if needed. Tropical species need protection to stay within about 54–79°F (12–26°C). Ask your vet about your species and climate.

How do I stop predators getting in?

Strong welded mesh, a dig-proof base, a safety porch and a shelter that can be closed at night. A double layer of mesh helps keep cats and birds of prey from reaching through.

Do I have to keep my aviary birds indoors during bird flu outbreaks?

Sometimes. In the UK, housing measures have applied to all captive birds, not just poultry. Check your government's current rules.

Can different species share an aviary?

Some can, if they are compatible in size and temperament and there's plenty of space. Lovebirds and parrotlets are often aggressive to other species.