The GBA Difference

Engineering That Protects The Environment

One problem. One building. One client at a time.

Our History

Forging a Path to Sustainable Energy

Since 1973.

Before energy efficiency was in demand, our founder, Dave Grumman, led the way in revolutionizing how building owners and managers reduced operating costs by delivering sustainable engineering solutions.

That foresight is the bedrock of GBA’s approach to every problem we solve for our clients. You might come to us to create a well-functioning facility, but you’ll always leave with systems that are better for the environment.

Learn More About Our Founding Days

Dave Grumman

“In the early 1970s, with sharply increasing energy prices and an oncoming energy crisis, I believed there could be a demand for a business that showed building managers and operators how to run their buildings for less. GBA is still growing, based on this strong foundation.”

— Dave Grumman, PE, FASHRAE, GBA Founder

Dave Grumman shows plans to an early client

Dedicated To You

Picking Up the Phone and Running Toward the Problem

At GBA, these are core principles.

You can rely on our team of responsive, collaborative engineering professionals to work closely with you throughout the project, and beyond. Our customer service ethic helps explain why 80% of our business comes from repeat clients.

"They work closely with our team to ensure that all of our concerns and needs are always addressed, resulting in a truly cohesive effort."

– Jeffrey Manders, VP, Global Project Lead, JLL

Sustainability Report

Embracing the Global Impact of Our Work

Our commitment to a sustainable society and planet extends beyond the work we do for clients. Here’s what that looks like:

GBA team member trains engineering staff at a client facility<br />


  • Free Energy and Water Benchmarking Survey for hospitals
  • Specializing in engineering services for energy-intensive facilities
  • Searching for energy- and water-efficient solutions to all MEP designs
  • Striving to help our clients reduce electricity, natural gas, and water usage and costs
  • Challenging and assisting building owners and vendors to strive for more energy efficient policies
  • Working to reduce greenhouse gas emissions with every project
  • Member of the U.S. Green Building Council
  • Active in standards development and evaluations for Green Globes
  • Participating in energy efficiency committees for professional associations
A staff member rides a shared GBA bike down the street.


  • Monitoring and reducing our energy and water usage
  • Reducing waste levels, recycling waste materials for reuse, and composting appropriate materials
  • Establishing policies that assist employees in sustainable behaviors
  • Raising employee awareness through activities and challenges
  • Assisting GBA stakeholders, including our landlord, to implement more energy efficient policies
  • Providing a safe and enjoyable work environment
  • Striving to retain staff and providing continuing education and training
  • Supporting the local community through volunteer and advisory efforts
  • Certified Sustain Evanston business and Bicycle Friendly Business
Al Butkus, GBA founder.

"The firm’s services have greatly expanded since 1973, but at our core is the culture of efficient utilization of our nation’s resources."

– Al Butkus, PE, FASHRAE, GBA Founder

Generic Hospital Exterior

healthcare Benchmarking

Annual Hospital Energy and Water Survey

Your usage of electricity, natural gas, water, and other resources can be turned into data that improves your facility’s performance. How? Since 1995, our annual Hospital Energy and Water Survey allows facility owners to evaluate what is or isn’t working compared to others.

With graphical and numerical comparisons in your hands, you make informed decisions based on solid data.

See our latest analysis, or submit your 2022 data for free

We’re Committed to Advancing the Field of Sustainable Engineering

By partnering with organizations with the same mission.

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Practice Greenhealth Logo
ASHE logo
nfpa logo
I2SL logo
health care without harm logo
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174 Awards for Engineering Excellence — and Counting

What we do wouldn’t be recognized without a commitment to creating the facilities clients need to operate at their best. For over 50 years, that commitment has been acknowledged through international, national, regional, and state engineering awards.

Take a look!

View Our Awards


We’re Evolving. See How GBA is Pushing Sustainable Engineering Forward.

Explore the latest news, projects, and events at Grumman|Butkus Associates.

Discover What’s New For GBA

Key Weather Considerations for PV Design

Key Weather Considerations for PV Design

Electrical designers must be conscious of environmental factors that will impact electrical equipment, including temperature, wind, snow, and so on. This is especially critical for photovoltaic (PV) installations where a large portion of the system will be subjected...

Sustainability Report Featured on New GBA Site

Sustainability Report Featured on New GBA Site

The newly released 2022 GBA Sustainability Report is now available at GBA's recently launched, redesigned website. In 2013, the firm released its first annual corporate sustainability report. We recently completed the ninth edition, detailing our current scope of...

GBA Celebrates its 50th Anniversary

GBA Celebrates its 50th Anniversary

Grumman|Butkus Associates marked its 50th year in business on May 2, 2023. The company was incorporated on May 2, 1973, as Enercon, Ltd.: a one-person energy consulting firm based in Evanston, IL. Initial commissions consisted mainly of energy management studies,...