Updated : Clarified published RSPCA housing guidance and removed unsupported new-rule claims.
Choosing a budgie cage means checking the bird’s space and daily routine together. This guide explains published RSPCA recommendations; it does not announce a new 2026 law or a newly issued cage-size rule.
What the RSPCA recommends
The RSPCA’s bird housing guidance relates dimensions to the actual bird’s wingspan:
- For a bird spending most of its time in the cage, each dimension should be at least twice its wingspan.
- For a bird spending most of its time outside, each dimension should be at least one and a half times its wingspan.
- For compatible colony-breeding birds kept together, the starting point is twice the largest bird’s wingspan in each dimension. Additional space is needed beyond the first two birds; the RSPCA specifies a 5% increase for each additional small bird under 50g.
The same guidance calls for uncluttered wing movement and at least six hours of safe daily flight outside an indoor cage. It does not give the combined-wingspan or fixed pair-width rule previously described here. Read the full guidance for its aviary, accessibility and species-specific qualifications.
A practical measurement check
- Record the cage’s internal height, width and depth, using the manufacturer’s internal measurements where available.
- Write down the number and species of birds and their actual daily routine.
- Photograph the layout with perches, toys and food containers installed.
- Use this information when discussing whether the setup is suitable. Ask for the reasoning behind a recommendation, not just a product labelled “budgie cage”.
Check the whole setup before buying
Prepare questions about the door openings, locks, bar spacing, cleaning access and the room where the cage will stand. Ask how the proposed arrangement will work for your birds, including any bird with reduced mobility or a medical condition. Where an individual bird needs an adapted environment, seek an avian vet’s advice.
Get help with your measurements
For a product enquiry, contact Paradise Pets Swindon with the measurements and photographs. A supplies discussion cannot certify a bird’s health or replace an individual veterinary assessment.
Source checked: RSPCA, Housing and environments for pet birds, 24 September 2026.
