When should a site survey be complete for civil design?

A site survey should be complete before civil design relies on its boundary, topographic, elevation, right-of-way, utility, or existing-improvement information. Civil engineers use the survey to establish a defensible base for grading, drainage, access, paving, utility routing, and site constraints; the required contents depend on the project and the surveyor’s scope. An older survey may be inadequate when conditions, ownership, utilities, or proposed work have changed. The surveyor is responsible for the surveyed information, the civil engineer interprets it for the design scope, and the AHJ or utility may require additional evidence.

The correct application of survey timing for civil design starts with the actual project, not a generic promise. Confirm the jurisdiction, adopted code, design scope, existing conditions, required deliverables, and professional responsibility before relying on a conclusion. A responsible engineer documents assumptions and identifies information that still needs verification.

Project type, occupancy, existing construction, site conditions, code edition, agency requirements, and changes made after the original design can change the work. A concise answer is useful for orientation, but the signed or sealed project record must reflect the current scope and the authority's process.

• Confirm the authority having jurisdiction and current checklist
• Use current drawings, calculations, field evidence, and equipment information
• Separate engineering decisions from owner, architect, contractor, utility, and agency decisions
• Record assumptions, limitations, and questions requiring direct AHJ confirmation