Surveying & Mapping

Surveying since 1885

We focus our expertise on traditional surveying methods, as well as electronic measuring, photogrammetric mapping and other state-of-the-art methods.

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Civil Engineering

Extensive expertise

We service all aspects of civil engineering including stormwater management, erosion control plans, floodplain studies and highway occupancy permits.

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Land Planning

Turning your vision into reality

Whether it's subdivision plans, estate planning, sewage plans, or site feasibility analysis, we offer the guidance and experience that provides peace of mind.

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Diehm & Sons

View our Portfolio to see a sampling of our projects.

History of Diehm & Sons

Since 1885, our company has been a Lititz area tradition. John T. Weber, the patriarch of our land surveying business, was a prominent citizen, teacher and justice of the peace. John’s great-great-grandson, Timothy operated Diehm & Sons from 1995 - 2018 with the same principles and ethics instilled over four generations. Ownership recently transitioned to his daughter, Jennifer Gerhart, and longtime Director of Engineering, Kevin Varner, P.E., making Diehm & Sons a fifth generation company.

John passed the business to his grandson, Paul F. Diehm, in 1934. During Paul’s 34 years as owner, he performed thousands of property surveys and changed the business name to Diehm & Sons with the addition of his children, Dale and Paul R., as employees. He succeeded the business to them in 1968.

Twelve years later, Timothy joined the family business after completing his education at Penn State University and in 1995 assumed ownership from his father, Dale F. Diehm (Paul R. Diehm retired from the business in 1982). Throughout the five generations of ownership, Diehm & Sons has become one of the most recognized names in surveying and mapping, civil engineering and land planning in Lancaster and Lebanon Counties. With history spanning more than a century, our vast records library and the stability of our staff provide the foundation of deep knowledge in this area.

At Diehm & Sons, we are client focused, knowledge driven and with every project look to place the service of our clients ahead of profits.