About Diehm & Sons From farmers to developers, Diehm & Sons serves a wide range of clients with expertise in land surveying and civil engineering. We are always willing to work within your specific planning and budgetary boundaries to produce cost-effective solutions tailored to your individual needs. As a small firm, we are able to offer the personalized level of attention that you want and deserve. We consider ourselves as a member of your team, seeking a successful outcome for your projects. Each of the professionals at Diehm & Sons has an average of 15 years of experience in surveying or civil engineering. We are fully licensed and insured as surveyors and civil engineers. We pride ourselves on always being available to answer any question our clients may have.