# Dark Sky Law: Illinois

Illinois requires new or substantially renovated state buildings to reduce nighttime exterior and interior-visible lighting, mainly to cut bird collisions rather than to control general light pollution. There is no statewide restriction on private or municipal outdoor lighting.

**Status:** limited (checked 2026-09-23)
Illinois requires new or substantially renovated state buildings to reduce nighttime exterior and interior-visible lighting, mainly to cut bird collisions rather than to control general light pollution. There is no statewide restriction on private or municipal outdoor lighting.

## Statutes
- [Bird-Safe Buildings Act, state building lighting](https://ilga.gov/legislation/ilcs/fulltext.asp?DocName=002004050K405-317), 20 ILCS 405/405-317 (2021)

## Sources
- https://news.wttw.com/2021/08/03/new-bird-friendly-law-illinois-calls-less-transparency-government-buildings
- https://ilga.gov/legislation/ilcs/fulltext.asp?DocName=002004050K405-317

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Canonical: https://darkskiesdirectory.com/laws/IL