A Mission-Driven Sustainable Engineering Firm

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

Let’s Talk Design Solutions

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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

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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

GBA Promotes Two Employees

GBA Promotes Two Employees

GBA's Chicago and New York regional offices promoted Timothy Venturella and Brendan Erskine to Senior Project Engineer at the recent semi-annual meeting. Timothy Venturella joined GBA’s Evanston office in 2023. He graduated with a BA in Public Relations from the...

GBA’s 2023 Sustainability Report Released

GBA’s 2023 Sustainability Report Released

Grumman|Butkus Associates continues documenting its efforts to “walk the walk” of sustainability with the release of its annual Sustainability Report. In 2013, the firm released its first annual corporate sustainability report. We recently completed the eleventh...

How To Develop an Effective Energy Management Project List

How To Develop an Effective Energy Management Project List

At GBA, we love helping clients set up Energy Management Systems. A comprehensive tool is the DOE 50001 Ready Navigator (https://navigator.lbl.gov/). It breaks the ISO 50001 Energy Management standard down into 25 tasks. At a minimum, energy management can be about...