Sponseller Group, Inc. stands as a versatile engineering firm with established offices in Holland and Sidney, Ohio. Our commitment extends beyond projects; we foster a collaborative environment that empowers our team to grow, expand their expertise, accumulate valuable experiences, and progress in leadership.  

Within the structure of Sponseller Group, Inc., our diverse personnel census encompasses professional engineers, graduate engineers, senior designers, and mechanical designers. Each department comprises of a manager, structural engineers, designers, and CAD personnel. Our corporate culture actively supports and encourages every staff member in their professional pursuits, personal accomplishments, and community engagement.

Sponseller Group’s main office is located in Holland, Ohio.  We moved into this bespoke newly designed office in 1998.  The 10,000 sq. ft. office houses about forty of our sixty four people from the various disciplines of civil, structural, mechanical ventilation, electrical, and mechanical system design.

The primary focus areas of our company encompass structural engineering, industrial architectural design, structural design, and facilities mechanical and electrical design, making them the predominant service offerings. The majority of our project assignments are executed in our two offices situated in Holland and Sidney, Ohio. In addition, we collaborate with general contractors and fabricators by delivering comprehensive engineering and design services. Thankfully, over eighty-five percent of our projects originate from repeat business with our existing clients.

Our objective is to offer quality engineering services at a reasonable and fair price, ensuring client satisfaction. With a track record spanning several decades, we’ve established strong relationships with numerous clients. At Sponseller, we acknowledge the central role of advanced analysis and design software, coupled with robust computing systems, in delivering optimal solutions to your challenges.

Our team of engineers and designers is dedicated to collaborating with clients from project inception to completion. We proactively identify and address potential difficult problems that may arise, even those not immediately apparent. Constantly engaged with clients, we contribute to enhancing operations for the next generation of products or improving current production processes.

What distinguishes us is our extensive experience, commitment to client needs, and timely responsiveness. Our employees enjoy long-lasting careers thanks to our inviting work environment, supportive colleagues, competitive salaries, comprehensive benefits, and refreshed workstations equipped with the latest software. We value and generously compensate new hires based on their experience and education.

 A short history of Sponseller Group

The company was started in 1973 by Harold Sponseller, P.E. a mechanical engineer who previously was employed at Owens-Illinois. Originally, he offered mechanical engineering and illustration services utilizing employees working in the office.  Later on, companies requested personnel to perform design services at their location.  He also offered machine design and build of complete automated equipment through a wholly owned machine shop, Accumatic Machinery.  After thirteen years he expanded into the structural field with structural engineering analysis, structural design, equipment layout services, and steel detailing for General Motors Corporation, McNally Pittsburg, and others.  Since that time, we have expanded to several hundred different clients.    

Mission Statement

We aim to offer manufacturers, fabricators, and contractors top-tier engineering and design services. Our commitment extends beyond delivering exceptional work; we prioritize providing meaningful employment and abundant benefits to our dedicated team and their families. We ensure competitive compensation, aligning with or surpassing other local engineering firms, fostering a rewarding and sustainable professional environment.

Quality Objective

To meet client expectations on accuracy, content, and delivery, we take responsibility and work to resolve any issues that may arise.


Our people are trained with all the required safety training for lockout/tagout, fall protection, lift training, confined space, first aid, AED/CPR, and mine safety.

View Our Service Offerings


  • Integrity & Honesty – we do what we say and pay for any errors or omissions
  • Safety First – protect our employees and yours in the workplace and on client jobsites
  • Respect – treat clients, employees, and subcontractors with the respect they deserve 
  • Attention to Detail – deliver an accurate set of drawings within a reasonable time frame
  • Leadership – be a leader at work, home, and in our community
  • Commitment – be committed to our clients’ and to our employees’ success
  • Competency – to serve our clients with appropriately qualified and seasoned professionals 
  • Teamwork & Flexibility – striving to find a way to say, “yes, we have found a solution to your problem”
  • Financial Strength – the company has fifty years of operations experience
  • Professionalism – we’re professional in our attitude, conduct, and presentation

Community Involvement

Sponseller Group supports the community through WISE – Women in Science and Engineering, WGTE public television, Cast Metal Association, Scouting, University of Toledo car competitions, Whiteford High School Robotics Team, United Way, MS Foundation, and other organizations.