There's a Reason I've Seen This Cat Door in Several Homes (It's So Smart!)
Briefly

"Our proudest DIY is the cat flap," Marion explained at the time of the tour. "We're renting, so we couldn't cut a hole into any existing doors. Hannah found a piece of white plywood by the bin in the street, which was perfect. She used a multitool to cut the wood to fit the window and put a hole in it for the cat flap. The whole thing slots into the window and can be removed when we move."
Read at Apartment Therapy
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