Using your ruler measure out two sections that are 22 x 23 and make a mark using your pencil these two pieces will be designated as the top and the bottom of the nest box 2 using the same plywood board measure four sections that are 18 x 22 and mark them with your pencil. Below are the essential requirements for barn owl nest box plans what is a good nestbox design list of criteria for indoor barn owl boxes entrance hole optimum size 130 x 130mm minimum 100 x 100mm maximum 150 x 150mm floor area of nest chamber good size range 02 to 04 m 2 absolute minimum 016m 2 the floor of the box featured on this page measures 500 x 400mm giving a floor . To create the entrance to the nesting box refer to the barn owl nesting box diagram below and position the two front panels side by side part a mark out the openings on to each of the front panel pieces and then cut out the opening with a jigsaw smooth over the rough cut edges with a rasp and sandpaper
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