šŸ“ What Is a Site Plan Survey?

A site plan survey is a detailed drawing that shows the location of existing and proposed structures on a property. It is required for most building permits and helps ensure that new construction complies with setbacks, zoning rules, easements, drainage requirements, and utility placement.

How a Site Plan Survey Works

A licensed surveyor measures the property and creates a scaled drawing showing boundaries, improvements, slopes, and proposed construction. Cities and counties use this plan to verify that your project meets local regulations.

A site plan survey typically includes:

  • Property boundaries (based on a boundary survey)
  • Existing structures such as the home, garage, driveway, decks, and patios
  • Proposed improvements (additions, ADUs, garages, pools, etc.)
  • Setback distances
  • Utilities (water, sewer, gas, electric)
  • Easements and rights of way
  • Drainage patterns and grading changes
  • Topographic features

A site plan survey is required for many building permits and is often used alongside architectural drawings and engineering plans.

Why Site Plan Surveys Matter

For Homeowners & Builders:

  • Required for most building permits
  • Ensures compliance with zoning and setback laws
  • Prevents encroachments onto neighboring property or easements
  • Helps plan drainage, grading, and utility connections
  • Provides contractors with accurate construction layout

Common projects requiring a site plan survey include:

  • Home additions or remodels
  • New home construction
  • Accessory Dwelling Units (ADUs)
  • New garages, sheds, or workshops
  • Swimming pools
  • Driveways, decks, patios

Example of a Site Plan Survey in Action

A homeowner wants to build a 400 sq. ft. ADU in their backyard. The city requires a site plan survey showing:

  • The main homeā€™s footprint
  • The proposed ADU location
  • Distance from property lines (setbacks)
  • Utility tie-in points
  • Drainage patterns

The city reviews the site plan, ensures all rules are met, and then issues a building permit. Without a site plan survey, the permit would be denied.

Why Site Plan Surveys Matter for FSBO Sellers

FSBO sellers often receive questions about potential renovations or whether buyers can add structures to the property. A site plan survey helps:

  • Show what's allowed based on setbacks and easements
  • Answer buyer questions about expansion potential
  • Increase buyer confidence through accurate property data
  • Prevent disputes over boundary lines and improvements

A well-documented site plan can make your FSBO listing more appealingā€”especially to buyers planning additions or ADUs.

šŸ”— Related Resources for Buyers & Sellers

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