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The cat loved the balcony the way he loved nothing indoors: he'd press against the glass, nose to the draught, watching pigeons with a focus that made the flat feel like a cage. I wanted him out there. I also knew that a cat on a high balcony is one bad decision from a headline, and I wasn't prepared to roll those dice. So I netted it, properly, and it was the best cat decision I made that year.
A net is not a sorry substitute. Done right it turns a death trap into a safe room with a view, fresh air, and sun on the fur. The mistake people make is a flimsy fix — a bit of mesh tacked to the rail, a gap at the top, a loose corner — that a determined cat walks straight through or squeezes past. A cat who wants out will find the gap you didn't notice, because you're not a cat and you don't think like one.
I used proper pet balcony netting, the knotted stuff that doesn't shred in sun, fixed to the outside of the rail with cable ties every few inches and a wooden batten along the top so there was no lip to climb. The net goes from floor to ceiling of the rail and overlaps the wall at both sides. No gap, no slack, nothing to push through. A cat can claw it all day and it holds.
The gaps are the danger, not the height. Cats don't fall off edges they can see; they slip through gaps they think are solid, or they climb the rail because the net stopped an inch short of the top. I ran my hand all the way round after fitting, looking for anywhere a paw could get purchase or a head could fit. The corners are where netting pulls; check those first, because that's where it fails.
Don't use zip ties alone on the lower edge if a dog shares the flat — a dog's weight against the net will pop them. I added a second line of ties and a strip of batten at the bottom so the whole thing reads as a wall, not a curtain. Weight against it should meet resistance everywhere, not just where you remembered to tie.
Make it a place he'll use. A shelf in the sun, a scratch post in the corner, a pot of cat grass he's allowed to chew — the balcony became his territory, not just a view. He stopped pressing at the window and started patrolling the net like a guard, which is exactly the point. Fresh air without fear, sun without risk.
Inspect it with the seasons. Sun brittles mesh, wind works ties loose, a claw catches a thread and runs. I check mine every month and after any storm, and I replace a panel the moment it shows a tear rather than trusting it to hold. The net is the only thing between the cat and the street, so it gets the respect that fact deserves.
There's a knack to introducing the cat to the new space so he doesn't treat the net as a threat. I left the balcony door open with the net in place and let him investigate on his own terms, with a treat just inside, and the first day he only sniffed from the threshold. By the third he was through the door and patrolling, and by the week he owned it. Forcing a nervous cat onto open air backfires; letting him choose it makes the balcony his idea, and a cat's idea is the only kind he trusts. I also kept a chair out there so I could sit with him, because a cat alone on a balcony is a cat looking for an exit, but a cat with a person is a cat on a perch. The net does the safety. The company does the rest. Together they turned a room he pressed against into a room he lived in.
I put a pot of cat grass out there so the balcony became a place he could nibble safely, not just stare. He grazes it like a connoisseur and leaves the houseplants alone, which is a bonus I didn't plan. A sunny shelf, the grass, and the net turned a strip of concrete into his territory, and the pigeon-watching from a safe height is the closest he gets to the hunt he's missing. Fresh air without fear, and a hobby that isn't my furniture.
He's out there now as I write this, flat on the warm tiles, watching the world through a fence of knot. Safe, sunning, and finally in the fresh air he'd been begging for. The view was always his. The net just let him have it.