Site Plan Requirements

Site plans are required for all construction and land use applications.  A site plan is a drawing of what is existing and proposed on a site. 

This list of requirements provides information on what is required for a complete site plan at application submittal. Multiple sheets may be necessary to provide all site plan requirements.

Please note: The City reserves the ability to require additional information on the site plans based upon specific site conditions and specific application requirements.

Level 1 Site Plan

These are the Level 1 site plan requirements. All site plans the City reviews must include this information for review.

  1. Address of site.
  2. Owner and Project Name.
  3. Legal description of the property, including any easements.
  4. King County Assessor’s parcel number.
  5. North arrow, which is consistent across all sheets.
  6. Provide lot size square footage.
  7. Property lines and dimensions. 
  8. All site plans must be legible.

Level 2 Site Plan

The Level 2 site plan must include everything required for Level 1 site plan and the items listed below.  This site plan will be required for small projects, commercial and single-family additions, commercial tenant improvements, etc.

  1. Drawn to an engineering scale (1” =10’ or 1” =20’), with legend.
  2. Site plans shall be drawn on an 11” x 17”, 22” x 34”, or 24” x 36” sheet set. 
  3. Provide location, dimension, and the use of existing and proposed structures on site (include fences, accessory buildings, utilities, temporary structures such as trailers/mobile homes/canopies etc. and retaining walls).
  4. Indicate all structures to be removed or demolished.
  5. Label distances between structures and property lines.
  6. Show driveways, drive lanes, and parking stalls, include dimensions and materials.
  7. Curbs, sidewalks, and street trees: type, location, and dimensions.
  8. Label, location, and dimension of any critical areas or buffers if present on or near property.
  9. Dimension and show all encumbrances for example: easements, streets, and alley right-of-way abutting the site.  Include street names.
  10. Show existing and proposed above- and below-ground utilities including water, sewer, electrical, utility boxes, vaults, and connections.

Level 3 Site Plan

The Level 3 site plans must include all the requirements listed for Level 1 and Level 2 site plans as well as the items listed below. 

  1. Site plans shall be prepared by an appropriately qualified professional and shall be based upon a site survey prepared by a WA State professional surveyor.
  2. Label land use, lot lines, and approximate location of structure on abutting properties.
  3. Provide size, type, and location of all significant trees on site.  Label trees “to remain” or “to be removed”.
  4. Label, location, and dimension any critical areas or buffers on or near site.
  5. Identify all drainage features.
  6. Provide new and existing landscaping type and width (Type I, Type II, etc.).
  7. Contour lines that reflect existing and proposed grades:
    1. For sites with flatter areas with a gradient that is equal to, or less than 15%, provide 5’ contour lines. 
    2. For sites with steeper areas with a gradient that is more than 15%, provide 1’ contour lines.
  8. Provide site data such as lot coverage calculations for existing and proposed buildings, impervious surface coverage, cut or fill volume in cubic yards.
  9. Provide location to the closest fire hydrant.
  10. Show Temporary Erosion and Sediment Control plan (TESC).

 

 

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