Even if you never need to exclude a building colony or find a bat in need of rescue, you can still help bats by providing and supporting good habitat. Consider building and installing bat boxes. But do your homework first. Many commercially available bat boxes are completely unsuitable for bats! Also consider what will happen to the colony if you move or after your project is installed. Bat boxes need maintenance and monitoring, so please make arrangements to ensure the habitat remains after you move on.
Bat Conservation & Management and Bat Conservation International have excellent information on selecting and installing bat boxes.
Finally, bats need a voice. Many local governments have citizen advisory committees on environmental quality, parks, animal control, wildlife use and management, urban forestry, historic preservation, planning and development, etc. The needs of bats and bat habitat management are rarely, if ever, considered at the local level. You can change that by getting involved.