Jacob & Hefner Associates

Jacob & Hefner Associates

1333 Butterfield Road, Suite 300
Downers Grove, Illinois 60515
Primary Contact: David Kulczycki
630-652-4600
Website
dkulczycki@jacobandhefner.com

Our Mission: Quality

Our mission is to deliver quality—a word that describes the grade of our work, and the character of how we go about it.

We believe quality comes from the earth. That it starts with the soil beneath our feet. Some see dirt. We see possibility.
A foundation for success isn’t just planted in the ground; we know it’s anchored in a relationship—one built on trust.
We take pride in our work: not from completing a project, but from delivering a site that will work for decades to come, regardless the tests of weather and time.

Quality isn’t about what we can get away with; it’s about what we can stay with. About what will be sustainable for the next generation and the one after that.

As handed down to us by our founders, the spirit of JHA is about building for the long-term—about building to last. That’s what quality means to us.


Civil Engineering
The JHA engineering team is licensed in multiple states and has extensive experience in the planning, design, permitting, and managing of land development, infrastructure, and water resource projects.

Land Surveying
Led by Carl Cook, a licensed surveyor with over 25 years experience in the industry, the JHA survey team has capabilities ranging from boundary surveys to construction layout to detailed topographic surveys.

Environmental Services
JHA Environmental & JHA Remediation provide environmental remediation and site services for the planning, management, and expert implementation of assessment, remediation, monitoring, and construction projects.

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