A balcony is not safe for a cat just because it has a railing. Only allow access if the entire space is securely enclosed, including gaps at the sides, beneath the railing and overhead where your cat could get out. If you cannot make it escape-proof, keep the balcony door closed to your cat and offer indoor alternatives.
Check the whole boundary, not just the railing
Walk around the balcony and look for routes a cat could squeeze through or climb over: spaces between rails, the gap under the balustrade, edges where a barrier meets the wall, and openings near the roof or above an open balcony. Furniture placed beside the edge may create another route out. Do not assume supervision, a flyscreen or a partially enclosed railing makes the space secure.
A purpose-designed enclosure can use suitable netting, wire or solid barriers to close every exit point. RSPCA guidance specifically includes balconies and notes that gaps between rails, walls and roofs need attention. Check that the barrier and its fixings remain secure and that other animals cannot enter. In a rental or strata-managed property, check what alterations are permitted before arranging installation; seek experienced installation advice if you cannot verify the enclosure yourself.
Give your cat a choice to go back inside
Where possible, connect the enclosed balcony directly to the home so your cat can retreat if frightened or uncomfortable. Provide shade, fresh water, a sheltered resting or hiding place, and a clear way back indoors. A balcony can change from pleasant to hot, windy or wet; do not leave your cat shut out there. Introduce the space while you are present and watch how your cat responds rather than forcing them to stay outside.
Check plants before placing them within reach, and keep cleaning products and other hazards out of the area. If the enclosure cannot be made fully secure, an indoor window-viewing spot and the play ideas in our indoor cat enrichment guide are safer ways to offer interest without balcony access.
What if your cat falls or escapes?
If your cat falls, contact a veterinarian promptly even if they initially seem able to walk; do not try to assess an injury from appearance alone. If they escape, search safely and contact local shelters or your council as appropriate. Once they are safe, close off balcony access until the escape route has been fixed.
The deciding question is simple: can your cat use the space without any route out and still choose to return indoors? If not, keep the balcony off limits until it can be secured.
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