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Make a box using untreated timber approximately 2cm thick. You will need two pieces of wood of equal length for the sides and a smaller piece for the base. If you're making a pitched roof you will need a protractor to measure 45° angles. Otherwise make a flat roof the same size as the base.
Screw the pieces of wood together, leaving the front open. Paint the outside of the box with a weather-proof paint. If making a pitched roof, cut to size pieces of slate or similar material, and screw three holes in each one, where you want to attach it to the wood. Use clout nails to gently fix the slate to the wood. Cover the join at the top with roof flashing.
Cut hollow canes such as bamboo into short lengths to fit in your bug box, sanding off any rough edges. You could also drill holes in pieces of wood or branch, making your holes different sizes to suit different insects. Fit the canes and wood into your box.
Drill a hole into the back or the base of your box and fix it on to a fence or wooden post, using a self-tapping screw.