A Barn Owl nestbox in a tree is the next best option if you do not have a suitable building. If you have a suitable tree, a tree box is easier and more practical than a box on a pole.
More about Barn Owl boxes for trees.
You will need:
- 8′ x 4′ sheet pressure treated 9mm plywood
- 30mm; 50mm & 70mm screws
- Bostik or Everbuild All Weather Sealant (not silicone)
- Weatherproof wood glue (e.g. Evo-stick)
- Torch on roofing felt or Polyester roofing felt + tacks
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