Stephen M. Yingst, P.E., CBIE

President and Owner

engineers lancaster pa

As the President and Owner of Yingst Engineers & Associates, Inc., Steve’s special expertise is in the evaluation and analysis of commercial and residential properties. As a Professional Engineer, he has personally inspected thousands of commercial and residential buildings. His experience ranges from a 750,000-square foot shopping mall, to a 100-unit apartment building, to primary residences and houses at every stage of construction. He provides in-depth consultations with building owners on specific problems, such as basement water infiltration, EIFS (Exterior Insulated Finish System) water infiltration, mold and mildew issues, structural repairs, roof certifications, and design/build assistance.  He is distinguished as an expert in the field of investigative engineering and frequently testifies in court as an expert witness.

Steve is a licensed Professional Engineer in the Commonwealth of Pennsylvania and the State of Maryland. He holds a Bachelor of Science degree from Penn State University (Go Lions!). Steve is a member of the National Academy of Building Inspection Engineers (NABIE), the Pennsylvania Society of Professional Engineers (PSPE), the National Society of Professional Engineers (NSPE), the Pennsylvania Septage Management Association (PSMA), and the American Society of Home Inspectors (ASHI). Steve’s technical articles have appeared in numerous publications. He has also received the Certified Building Inspection Engineer (CBIE) designation through a program established by NABIE.


Kathy E. Yingst

Vice President

Meet Our Team

As Vice President and Chief Operating Officer of Yingst Engineers & Associates, Inc., Kathy is responsible for day-to-day management of the company. In this capacity, she oversees the scheduling and secretarial functions, coordinates report review and delivery, and performs the firm’s accounting and bookkeeping functions.

Kathy also coordinates the firm’s marketing efforts and public relations through meetings with potential customers, marketing surveys and mailing of quarterly newsletters.  Kathy received her Bachelor of Science degree in Business Management from Lebanon Valley College, Annville, Pennsylvania.



The Mission of Yingst Engineers & Associates, Inc. is to:

Provide practical, trustworthy engineering and architectural services to educate residential and commercial clients on the homes and buildings in which they live and work.

Create a work environment that allows employees to achieve professional growth and personal satisfaction while helping others in an ever-changing industry.

Provide a supportive work environment that rewards individual contributions and team collaboration.


At Yingst Engineers, our primary goal is to deliver an exceptional service that exceeds your expectations.  We are focused on friendly and knowledgeable customer service and attention to details.  Thank you for choosing us, we look forward to working with you!