Commercial Addition

Application Preparation

All permit applications are available to apply for electronically, through the Permit Portal.

When filling out an electronic permit application, depending on the permit type, there may be submittal document required. Each permit type has its own set of requirements and details you will need to provide.

Below is the specific information that will be needed to complete the listed permit application.


Project Description

A detailed description is needed for every project. Note: on the application the area for this description has a red asterisk.
Be Specific!


  • Adding a 150 square foot covered entry
  • Adding 200 square foot room to the back of an existing building


Submittals are needed for any projects, that require prior approval, through a plan review.

Submittals that are not needed for your project, will be removed during the initial application review. Additional submittal requirement may be added during the review, as needed.

Documents are required to be uploaded as a digital pdf or as a scanned pdf. All pages of a document are to be uploaded as one document, not individual pages. Each of the below listed requirements, are to be a separate submittal.  

Visit the General Requirements for Submittals page for document detail requirements.

  • Floodplain Significant Improvement Determination (Required only if the project is in the floodplain. Floodplain Administrator will assess through project valuation determination.)
  • Asbestos Survey (if disturbing sheetrock, ceilings, flooring, etc., must hire a certified asbestos tester to provide the survey)
  • ORCAA Notification (this is a permit you purchase through ORCAA if you are doing a large amount of demo or your Asbestos comes back positive and you need to have it moved.)
  • Asbestos Abatement Verification (this is required if you had any asbestos removed)
  • Benchmark Report (Building Finished Floor Elevation Benchmark - For properties not in the floodplain. Provided by Foundation Contractor, Engineer, Architect, or Land Surveyor. City Ordinance requires the bottom of the first floor to be 18 inches above the crest of the road. City-provided Benchmark form required.)
  • Flood Benchmark Elevation Certificate (Pre-Construction Flood Elevation Certificate - provided by a Land Surveyor, Architect, Engineer, or Contractor. Using the FEMA-provided current Flood Certificate form. This will be the first of 3 required surveys. This will confirm the current ground elevation and preconstruction finished floor elevation for existing or new buildings.)
  • Site Plan (The site plan will need to be the layout of the building showing the location of the addition in relation to the existing building and the property lines.)
  • Construction Plans
  • Energy Code Compliance Forms (Washington State Energy Code Requirements)
  • Engineering Calculations (This requirement is only if the project has been deemed to need engineering)
  • Final Flood Proofing or Final Elevation Certificate (required for occupancy of any new construction.)


This section of the application will require you to provide the below information.

  • How many stories is the building?
  • How many dwelling units are there, if any?
  • What is the building's existing square footage?
  • What is the total square footage of the addition?


Permit fees will be based on this project valuation. The valuation is the project cost, that includes all materials and labor at market price. 

All fee structures can be viewed on the Fees page.

  • Building Fees

Other Possible Requirements

This section of the electronic application will have a link for the possible additional permits needed for the project. Any additional permits listed, that are not required, will be removed during the review process.

The below links will take you to instructions on the information needed to complete them.