How much weight can a window perch hold?

A stated weight capacity describes a correctly installed piece on clean, flat, undamaged glass at room temperature. Always check the figure listed on the product you're buying.

Capacity is not a target. Choose a piece rated well above your cat's weight, and account for the force of a cat landing rather than stepping.

If your window glass is cracked, single-pane and old, or shows any movement in its frame, use a freestanding piece instead.