A Mission-Driven Sustainable Engineering Firm

50 years of creating solutions that solve your problems – and the planet’s.

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Engineering Sustainable Solutions That Matter

Most of our clients return for our effective solutions, but all of our customers leave with efficient building operations that save energy, save time, and cut costs. At Grumman|Butkus Associates, our dedication to being sustainable design engineers who put people and the planet first has led to decades-long partnerships with clients and hundreds of millions of dollars in energy savings.

Discover the GBA Difference

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“A commitment to energy conservation and customer service inspired the founding of our firm. Fifty years later, it’s still the bedrock of every project.”

Dan Doyle, Chairman – Illinois

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Improve Your Building Systems. Impact The Planet.

With innovative energy efficiency consultants at your side.

You need your facility to operate at its best, and we’re here to help you go beyond that. Our LEED and energy efficiency consultants have the expertise to create effective solutions that will benefit both your bottom line and the environment.

Explore Our Energy Efficiency Consulting Services


Customer Satisfaction

Licensed Professional Engineers

LEED Projects

Commissioning Group Engineers

Effective Data. Efficient Designs. Sustainable Engineering Expertise.

Find the strategies you need to operate at your best and improve your bottom line with proven analytical, design, and commissioning expertise.

Multidiscipline Sustainable Engineering

We haven’t met a problem we couldn’t solve.

“Grumman|Butkus Associates has been a valued partner with Hyatt since 1984. Their professionalism and quality work continues to make them a trusted team member on our equity portfolio projects.”

Fred Brandstrader, AIA, Hyatt Hotels

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Design. Build. Innovate.

Turn your passion into a thriving career at GBA.

If you’re an entrepreneurial engineer who thrives on solving the unsolvable, GBA is the right career move for you. When you join GBA, your ambition will be supported by experienced engineers who know what it takes to succeed – in the field and as a team.

Design Your Career With GBA


175 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-level 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

ComEd Recognizes GBA as Outstanding Energy Efficiency Provider

ComEd Recognizes GBA as Outstanding Energy Efficiency Provider

Electrical utility ComEd has praised GBA’s work across its Energy Efficiency incentive program, honoring GBA with the 2022 Energy Efficiency Service Provider (EESP) Award and the 2022 Most Savings of the Year Award. The EESP designation is given to the Service...

GBA Promotes Five Employees

GBA Promotes Five Employees

GBA's Chicago regional office promoted five staff members at the recent semi-annual meeting: Kevin Vander Klay, PE, QCxP, LEED AP, was promoted to Associate. Heather Beaudoin, PE, LEED AP BD+C, CEM, BEMP, GBE, was promoted to Associate. Abigail Steimel, CEM, was...

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...