If your cat is constantly sitting on the window sill basking in the sunlight and taking in the sights outside, it's time to give her the proper perch she deserves. This DIY Cat Window Perch from Martha Stewart is an attractive addition to the living room and your cat will love lounging in it for hours on end.
Step 1: Measure window width inside frame.
Cut plywood to that width with a jigsaw and 18 inches deep.
Step 2: Wrap edges of plywood with leather strip.
Mark strip 1/2 inch from corners on both sides of one long edge (for nails; see photo, above); punch holes at marks. Apply glue to wood edge and back of strip. Press to adhere; let dry.
Step 3: Pre-drill holes for nails into wood at punched holes in leather strip; hammer in nails.
Step 4: Screw eye hooks in at top corners of plywood on one long edge and into window jambs midway up.
Attach safety chain to eye hooks with S-hooks. (To calculate chain length, think back to when you learned the Pythagorean theorem and a2 + b2 = c2, where a is the distance from the bottom of the window to the plywood eye hooks; b the distance from the bottom of the window to the window jamb eye hooks; and c the length of chain you'll need.)
Step 5: Pre-drill holes down through back corners of remaining long edge of plywood and into sill; secure with wood screws.
Top with cushion and sheepskin.