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Measure the wood. You'll need four lengths: 58cm, 30cm, 20cm and 15cm. Using the remaining wood from the plank, measure the batons – you'll need two 30cm x 2cm x 2cm and two 20cm x 2cm x 2cm.
Cut the wood, using a saw or jigsaw. Sand any rough edges to remove any splinters. Drill a hole near the top of the largest piece of wood – you’ll use this to attach it to the wall.
Leaving 10cm below the hole, nail the 30cm wooden battens to either side of the 20cm x 58cm piece of wood.
Bats don’t like draughts, so make sure all joints are secure.
Nail the 20cm x 30cm wood on top of the 30cm batons and repeat with the 20cm baton pieces.
Nail the 20cm x 20cm piece of wood to the 20cm length batons. Then attach the 15cm piece as a roof so it covers the wooden pieces completely and doesn’t allow water in. For extra weather protection, attach a piece of roof flashing to the top. Fix the box under the eaves of your house in a sunny but sheltered spot.