Made to the British Trust for Ornithology design. 

Suitable for robins, wrens, pied wagtail and spotted flycatcher.
 
The boxes have:
Removable front panel to allow cleaning.
Drainage holes in the base to prevent waterlogging.
Roofing felt which protects the box from the weather, making it last much longer.
Exterior painted with non-toxic, low-VOC preservative (available in a selection of colours, see below).
​The back plate has a hole to allow the box to be easily fitted to a tree or wall.
 
The boxes measure approximately 30cm/12" (H), 14cm/5.75" (W) and 23cm/9" (D).