Cat window perch for overweight older cats

Window perches are genuinely one of the best enrichment additions for indoor cats — birds, movement, sunlight, and a warm spot all in one place. For an older, heavier cat who can't jump freely, the setup needs a bit more thought: the suction cups have to hold real weight reliably, and you'll want built-in steps that start close to the floor so he doesn't strain joints or skip the perch altogether. To point you in the right direction — how much does he weigh roughly, what kind of windows do you have (smooth double-glazed, older single pane), and is this just for him or do other cats use it too?

7kg on single glazed glass is the bit I want to be straight with you about — suction cups on older single pane glass can be less predictable because the surface is sometimes slightly uneven or has a slight flex. That doesn't make it impossible, but it means the mounting system matters a lot. What type of sash window is it — does it have a wide flat sill, or is the sill quite narrow?

That radiator being there actually changes things nicely — it means you don't need a full floor-to-perch step system, you just need a perch he can step onto from the radiator height. That simplifies the job considerably and means you can focus the budget on a perch with a genuinely strong suction mount and a decent padded surface. My recommendation is the K&H Pet Products EZ Mount Window Bed. It's widely available on Amazon UK, the suction cups are among the most reliable on the market for cats up to and slightly beyond 7kg, the sleeping surface is around 38x25cm which is ample for a domestic shorthair, and at radiator height the step from radiator to perch is minimal. Pad the perch with a fleece square if you want extra comfort for older joints. The one thing to do: clean the glass thoroughly with rubbing alcohol before mounting, press and hold each cup for 30 seconds, and check them again after 24 hours. On single glazed glass that routine really does make the difference.

The K&H EZ Mount is rated to around 25lbs which is roughly 11kg, so your cat at 7kg sits comfortably within that. The honest caveat with any suction cup perch is that no manufacturer can guarantee adhesion on every glass surface, so the prep really matters — alcohol-clean glass, firm pressure on each cup, and a 24-hour check before he uses it unsupervised. A lot of owners also run a strip of anti-slip mat on the radiator just below it so he has confident footing on the way up. If after a week the cups are holding steady with no creep at all, you can trust it. Most people find they do.

He's going to love it — older cats especially get a lot from having a reliable warm spot with something to watch. Good luck with the setup.