The sunniest seat in the house and the safest one can be the same seat, as long as the glass stays between your cat and the road. That means road-facing windows stay shut unless they are guarded by pet-proof mesh or by locks that limit how far they can open — ordinary fly screens and a cat's full weight are a bad combination. Her sunbathing station goes on the room side of that barrier: a broad perch fixed at sill height, a hammock rated to hold her, or a sturdy shelf, each positioned to catch the light she would otherwise chase outside. From there she gets warmth, a view and passing entertainment with no route to the traffic at all.
Follow the sun patch, too: a cardboard box or a spare bed rotated into whichever room currently holds the light gives her a second station that moves through the day, so she is not fixated on the one window someone eventually wants to open.
Screens, Locks and the Windows You Do Open
A screen meant to keep insects out will not hold a cat who launches at a pigeon, so treat every openable window as a door she is planning to use. Fitted mesh screens made for pet resistance, checked for claw damage and loose corners, are the minimum for a window opened for air; restrictor locks that hold a window to a gap too narrow for her head are the alternative where screens cannot fit. Test each fitting with real pressure from inside, at cat height, because she will.
Older cats and kittens need the same hardware, not lighter versions: an elderly cat can be startled through a gap she would never have attempted deliberately, and a kitten treats every fitting as a climbing frame with consequences she has not learned yet.
What to Watch Once the Perch Is Up
A cat who sunbathes for hours can overheat or sit in strong sun until her ears — especially pale ones — are repeatedly exposed, so give the station a shaded end she can retreat to and keep water nearby rather than downstairs. If she stops using a favourite perch suddenly, look for what changed beside it: a new building's reflection, a neighbour's cat now visible on a wall, building work she can hear through the glass. The perch itself also needs checking — suction cups age, shelf brackets loosen, and a hammock that drops once may never be trusted by her again.
One Window Policy for the Whole Household
The setup fails socially, not structurally: one person opens the big window 'just for a minute' while cooking, another assumes the screen was refitted after cleaning. Agree the rule in plain terms — road-facing windows stay shut or locked on their restrictors, screens get checked after every clean — and make sure visitors and pet-sitters hear it too, not just the family. On KinsLe, Family Sharing gives the relatives you pick access to her profile — sharing it with family you have chosen, and with nobody beyond them.