How to build a barn owl nestbox our deep nestbox design is very safe for owlets due to a 450mm drop from the entrance hole to the bottom and an exercise if you wish to vary from this owl box diagram please check our essential criteria for interior barn owl boxes. How to build a barn owl box step 1 measuring and cutting plywood boards using your ruler measure out two sections that are 22 x 23 and make a step 2 drilling holes in bottom of board for drainage before assembling the nest box take the bottom 23 x 22 piece step 3 assembling the . How to build a barn owl nest 1 find your location because placement of boxes is crucial the first step is to take a close look at rodent infested 2 find the right box for you next decide on the type of nesting box you desire from elaborate designs complete with 3 make the box to
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