A site survey measures and maps a site before construction begins. It records the boundaries, the topography, the utilities, the vegetation, and the existing structures. It is the first step in the design process. Without a survey, the architect cannot know where to place the building. The engineer cannot design the foundation. The contractor cannot plan the excavation. The survey is the foundation of the design.

A site survey includes several components. A boundary survey establishes the property lines. A topographic survey maps the elevation and contours. A utility survey locates the underground pipes and cables. A vegetation survey identifies the trees and plants to be preserved or removed. An environmental survey checks for wetlands, floodplains, and contamination. Each component requires different equipment and expertise. The surveyor uses total stations, GPS, drones, and ground-penetrating radar. The data is processed into a map or a 3D model. The map is used by the design team.

A site survey must be accurate. An error in the boundary can lead to a lawsuit. An error in the topography can lead to drainage problems. An error in the utility location can lead to a dangerous strike. The surveyor is a licensed professional. They stamp and sign their work. They take responsibility for the accuracy. The survey is not glamorous. It is not creative. It is essential. It is the first fact of the project. Everything else is built on it.