A customer wrote to us last month asking why her budgies kept squabbling even though she’d bought “the big cage.” Turns out her aviary was tall but narrow — great for climbing, useless for flying laps. That’s the thing about aviaries: size on paper doesn’t always mean usable space for the birds you actually have.
If you’re outgrowing a standard cage or starting from scratch with a small flock of budgies, canaries, finches or quail, a large bird aviary with extension solves a specific problem — you get a proper flight zone plus a separate area for nesting boxes, feeders or a breeding pair you want to keep apart from the rest.
## Why the “extension” bit matters
Most backyard bird keepers start with one enclosure and quickly realise they need to separate birds — a new pair settling in, a sick bird recovering, or just giving dominant birds their own space so feeding time isn’t chaos. An aviary built with an extension already has that second compartment designed in, rather than you bolting on a second cage later and hoping the mesh gauges match.
The Large Bird Aviary with Extension is built exactly for this. It’s galvanised steel mesh, silver finish, sized for a real backyard corner rather than a balcony. The extension gives you a genuine second zone — useful if you’re keeping finches in the main run and want a quieter nesting section, or if you’re slowly building up a flock and want new birds quarantined for a couple of weeks before mixing them in.
## Matching aviary size to your flock
A rough rule vets and aviary breeders use: budgies and finches need enough width to fly a short distance, not just hop between perches. Height matters less than length for flight, but height matters a lot for adding perches at different levels so birds aren’t all crowded on one bar.
Here’s how the sizing plays out across our range:
- Small flock, limited yard space: the Rectangular Outdoor Bird Cage at 215 x 208 x 247cm suits four to six budgies or a handful of finches. It’s compact enough for a side yard or patio corner but still tall enough for proper perch layering.
- Growing flock needing separation: the Large Bird Aviary with Extension gives you the main flight area plus a dedicated second compartment — ideal once you’re past “a few birds” and into managing pairs, breeding, or just keeping the peace between dominant and shy birds.
- Serious backyard setup: the Large Outdoor Aviary with Extension, at a substantial 1118 x 303 x 216cm, is built for keepers running multiple species or a decent-sized colony. That length is what actually lets birds fly rather than just flap between perches.
## Where it actually goes in your yard
These aren’t cages you shuffle around each season, so measure the footprint before you order, not after. Galvanised steel mesh aviaries are heavy and meant to stay put — pick a spot with morning sun and afternoon shade if you can, since Australian summers get brutal on anything facing full west sun from noon onward.
A few things we tell customers to check against their own yard:
- Clearance for the roof line — some aviaries have a peaked or sloped top for rain runoff, so measure to the highest point, not just the walls.
- Access for cleaning — you want to walk in, not just reach through a door. All three of these models are walk-in height, which makes weekly cleanout far less of a chore.
- Fence line proximity — galvanised mesh holds up well outdoors, but keep a little clearance from timber fencing so moisture doesn’t sit trapped between the two.
## What the mesh and finish actually mean for durability
Galvanised steel is the standard for outdoor aviaries here for a reason — it resists rust far better than painted mesh, which matters once you’re through a couple of Melbourne winters. The anthracite and silver finishes aren’t just cosmetic either; darker finishes tend to hide dirt and weathering better if your aviary sits in a visible spot near the house.
Mesh gauge matters more than people expect. Finer mesh keeps out mice and sparrows trying to steal seed, while still letting airflow through. If you’re housing small finches, double-check the gauge is tight enough that nobody’s slipping out — this is where the size specs on each listing are worth reading properly rather than guessing from the photo.
## Setting up the extension zone
Once you’ve got the extension, don’t just leave it as overflow storage for spare perches. A few ways keepers actually use that second compartment:
- Quarantine space for new birds for the first two weeks
- A quieter nesting area away from the main flight zone
- Separate housing for a breeding pair while the rest of the flock stays in the main run
- A feeding station kept apart from bathing water, which cuts down on mess and mould
If you’re planning to eventually add a second species — quail on the ground level while finches fly above, for instance — the extension is genuinely the difference between a functional setup and constant management headaches.
Assembly on these larger aviaries takes two people and a couple of hours, generally on a level, compacted surface — pavers or a cleared patch of yard both work. Worth doing this on a still day too; galvanised mesh panels aren’t exactly light, but they do catch wind before they’re fully bolted together.
If you’re still deciding between models, measure your actual usable yard space first, count your current birds and be honest about whether you’ll add more within the year. It’s a lot easier to buy the size you’ll need in twelve months than to relocate an aviary full of established, settled birds later.