For swifts the nest box should be sited at least five metres high and not south facing.
The Cambridge Swift rendered box is easy to fit as it sits on both walls and is a standard UK block width of 440mm. With a 250mm cavity it is advisable to support the back of the box.
The hole is on the centre line, so it does not matter which way up it is installed.
Preferably install the built in block into the gable end on the north or east side of the building 3 courses down from the top . This gives an ideal height for the block and is an area where there will be little disturbance from humans. Keep the flight path of the nesting box clear so do not allow trees or shrubs to grow in front of the wall. Swifts likes to breed in colonies, therefore it is advisable to build in several building blocks together. The distance between the mounting the blocks must then be at least 40 centimetres. No nesting material needs to be added. The recommendation is that you should place a minimum of 1 block per new dwelling so on a 30-house development you would have 30 blocks on the site.
As this block is designed to go in the gable end high up it will normally be against a cold space, so insulation is not essential.