This is an idea borrowed from the Barn Owl A-frame, a very successful, well tried design for owls (Little, Tawny and Barn), Kestrel, Stock Dove, Jackdaw and even squirrels and cats.
It accommodates 6 pairs of Swifts. The whole thing can be assembled on the ground, then hoisted into position on a pole or wall. With the double roof it is well insulated from the sun, the front is easily removed for maintenance purposes.
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It is best not to orientate this box directly south, unless an extra thick front is provided. A smooth metal sleeve around the pole is also a good idea to deter rats and squirrels.