Construction details are available in many wildlife gardening books. Garden lights Insects are attracted to bright lights. Fix a light in your garden and regularly leave it on at dusk to encourage bats to visit it when foraging. Mercury vapour lights are particularly attractive to insects. A pile of logs left undisturbed in the shrubbery or a corner of the garden to rot, will become home to a host of insects and other organisms.
Rockeries Build a rockery on the principle of drystone walling.
A double sided wall, filled with straw and incorporating very little soil, can become an attractive feature as mosses and lichens colonise. The spaces will be available as roost sites for bats, as well as home for some of the invertebrates upon which they prey. Alternatively, an earth bank faced with dry stone walling may be more suited to your garden. Leave cavities in the centre as well as plenty of small holes in the facing. As artificial tree holes, bat boxes offer an additional option for bats searching for a roost site.