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.

Frequently Asked Questions

Can you mark the boundary of my property?
I need a survey. Can you help me?
I've been told I need a floodplain elevation certificate. What is that, and can you help me with it?
I want to subdivide my land. What do I need to do?
I want to build a new building or expand my existing building. What do I need to do?
I've been told I need a stormwater management plan. Can you help me?


Can you mark the boundary of my property?
Yes. If you contact Doug Herr in our office, he will help you with the marking of your property.

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I need a survey. Can you help me?
Yes. We provide a wide range of surveying services including boundary surveys, topographic surveys, ALTA surveys, etc. Surveys can typically be completed within a few weeks depending on the kind of survey you need.

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I've been told I need a floodplain elevation certificate. What is that, and can you help me with it?
A floodplain elevation certificate is used to determine whether or not a property is located within a defined floodplain area. It can be used to establish whether or not floodplain insurance is required. Yes, we can provide these certificates for you.

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I want to subdivide my land. What do I need to do?
If you own a parcel that fronts along a public road and you wish to subdivide the parcel into two or more lots, you will need to submit to the municipality and/or county planning commission, a complete subdivision plan showing the proposed lots and roadway layout, if applicable. The subdivision plan must be prepared by a professional surveyor, licensed in Pennsylvania. If the subdivision includes construction of a road or other infrastructure improvements (i.e., stormwater management facilities, water and sewer lines, etc.), you will have to hire a professional engineer, licensed to practice in Pennsylvania. Both professionals will be required to prepare the plan, and sign and seal it as well. Diehm & Sons has both licensed surveyors and engineers, so we can provide you with all the needed services to prepare and submit your subdivision plan.

We will prepare and submit your subdivision plan to the municipality and/or county planning commission for their review. The municipality will have their consultant engineer review the plan and provide a review for consideration by the municipal officials. Once the plan has been made satisfactory in the opinion of the municipal engineer, the municipal officials (Planning Commission, Supervisors, Commissioners, Council, etc.) will approve the plan. It must then be recorded at the county Recorder of Deeds office.

There are numerous aspects to the processing of a subdivision plan application which include, but are not always limited to the following:  zoning hearings, PennDOT permits, sewage planning, wetlands studies, traffic studies, geology studies and floodplain studies. When you meet with us to discuss your project, we will develop an idea of which of these additional aspects could be issues for your project and develop a strategy to effectively deal with them as part of the process.

The process for subdividing land is a long and costly process. You should plan on a minimum of six months for this process from the time you first contact us to the time the plan is completed and recorded. The cost of each project can vary significantly depending on the size and scope of the project and what additional issues will affect the project. We will be happy to review your project and develop an estimate for you.

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I want to build a new building or expand my existing building. What do I need to do?
If you wish to expand an existing building or construct a new building, you will need to submit to the municipality and/or county planning commission, a complete land development plan showing the proposed building(s). The land development plan must be prepared by a professional surveyor, licensed in Pennsylvania. If the project includes construction of a road or other infrastructure improvements (i.e., stormwater management facilities, water and sewer lines, etc.), you will have to hire a professional engineer, licensed to practice in Pennsylvania. Both professionals will be required to prepare the plan, and sign and seal it as well. Diehm & Sons has both licensed surveyors and engineers, so we can provide you with all the needed services to prepare and submit your land development plan.

We will prepare and submit your land development plan to the municipality and/or county planning commission for their review. The municipality will have their consultant engineer review the plan and provide a review for consideration by the municipal officials. Once the plan has been made satisfactory in the opinion of the municipal engineer, the municipal officials (Planning Commission, Supervisors, Commissioners, Council, etc.) will approve the plan. It must then be recorded at the county Recorder of Deeds office.

There are numerous aspects to the processing of a land development application which include, but are not always limited to the following:  zoning hearings, PennDOT permits, sewage planning, wetlands studies, traffic studies, geology studies and floodplain studies. When you meet with us to discuss your project, we will develop an idea of which of these additional aspects could be issues for your project and develop a strategy to effectively deal with them as part of the process.

The land development plan process is a long and costly process. You should plan on a minimum of six months for this process from the time you first contact us to the time the plan is completed and recorded. The cost of each project can vary significantly depending on the size and scope of the project and what additional issues will affect the project. We will be happy to review your project and develop an estimate for you.

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I've been told I need a stormwater management plan. Can you help me?
Yes. We can provide a stormwater management plan for you based upon what you wish to construct (building, paving, swimming pool, barns, poultry houses, etc.). The processing of a stormwater management plan is similar to that of a subdivision or land development plan. A plan must be prepared and submitted to the municipality for their review and approval. There are other aspects to the processing of a stormwater management plan which include, but are not always limited to the following: zoning hearings, PennDOT permits, wetlands studies, geology studies and floodplain studies. When you meet with us to discuss your project, we will develop an idea of which of these additional aspects could be issues for your project and develop a strategy to effectively deal with them as part of the process. We will be happy to meet with you and discuss your plan and develop an estimate for you.

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