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Case Studies

Featured Case Studies

This case study library shows how Illinois building professionals planned, executed, and problem-solved real projects — highlighting the strategies, technologies, and best practices that improved building performance, cut energy use and costs, and streamlined operations. Each one covers the challenges project teams ran into and how they worked through them. Whether you're scoping your first retrofit or your fiftieth, these are practical, real-world examples you can put to use on your own projects.

Commercial Buildings

An aerial view of a city skyline with a river in the foreground.
A building with a red awning on the side of it
An aerial view of a building with stairs and a balcony
A large white building with a clock tower in the middle of a city
Looking up at a very tall building with a red awning
A picture of a tall building was taken in 2011
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Nonprofits and Small Businesses

A large building with a lot of windows is sitting on the corner of a city street.
A group of children are dancing in front of a building.
A young boy in a blue jacket is standing next to a green trash can.
A library with lots of books on shelves and a clock on the wall
A greenhouse filled with lots of plants and hanging baskets
A large container filled with lots of plants is sitting in a room.
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Higher Education and Healthcare

A group of people are sitting at tables in a large room with a glass ceiling.
A large brick building is surrounded by trees and grass
An aerial view of a large building with a parking lot in front of it
The front of a building with a blue mailbox in front of it
A large building with lots of windows is surrounded by grass and trees
A row of white boilers with a1 on them
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Hospitality and Multifamily

A boat is floating on a river in front of a large building.
A red valve with a green label that says water return
A very tall building with a lot of windows
A restaurant with tables and chairs and a colorful ceiling

Municipal Buildings

A large building with a sign on it is surrounded by trees and grass.
A group of people are standing in front of a large building.
A patio with tables and chairs overlooking a lake
A group of construction workers are installing solar panels on the roof of a building.

Green Building Case Studies Across Illinois

This database consists of green building and energy efficiency case studies prepared by different organizations from across Illinois. This resource is curated by Illinois Green Alliance, however listing of a resource on this page does not imply endorsement. If there is a case study we should add, let us know.

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