New house construction or large addition information.
Consolidated Review Changes
As of Sept. 2, a new streamlined review process is being implemented for residential building permits (BS permits). The change is designed to make the permitting experience more efficient and predictable. The new process replaces independent, parallel reviews with a consolidated review process that brings all disciplines together to provide applicants with more consistent and aligned feedback across disciplines.
Key improvements:
- Coordinated review comments from all departments
- Review comments issued together with cross-discipline alignment
- Updated submittal information (coming soon)
These improvements are based on feedback from builders and developers seeking a more efficient and transparent review process.
Middle Housing Permitting
If you are applying for middle housing permits as of June 30, 2025, the Development Services Department has implemented the following permitting updates:
- Single structure with 1-2 new dwelling units.
- One BS permit will be required for the development
- Multiple structures with 1-2 new dwelling units (in each structure)
- One BS permit will be required for each structure.
- A GD permit (Clearing and Grading permit) will also be required to document site work and compliance with the land use, fire and transportations codes.
- For more information regarding GD permit requirements, please visit our GD permits page
- A single structure with more than two (2) new dwelling units
- A Commercial Building Permit (BM or BB) and a GD permit will be required.
- For more information about permitting requirements for a single structure with more than two (2) dwelling units, please visit our Medium Commercial Project (BM) and Major Commercial Project (BB) permit pages.
This permit also includes:
- Clearing and grading
- Demolition work, if required
- Electrical (except temporary power)
- Mechanical (except fire protection)
- Plumbing
- Right of way work on-site and in the public right of way
- Storm drainage connections
Contact a Utilities representative for information about water and sewer services.
Submittal Information
Construction of a new one or two-family residence or an addition greater than 3,000 square feet of new and/or replaced floor area. (BS)
Apply for this permit online at MyBuildingPermit. When entering your Application Information, choose the following:
- Application type: Building
- Project type: Single Family Residential
- Activity type: New Construction or Structure Addition-Major
- Scope of work: Residence and All Associated Structures (New Construction)
Required Documents
The documents listed below are the minimum necessary to proceed with the application process. If you believe that a required submittal document does not apply to your project, please upload the Document Waiver Form in place of the required document.
- Arborist Report
- Construction Stormwater Pollution Prevention Plan (CSWPPP Short Form)
- Disconnection of Water/Sewer Service Form
- Storm Drainage Report
- Structural or Lateral Calculations
- Construction Design documents (Single PDF, Bookmarked, including all plans below)
Construction Design documents must be submitted as a single PDF. This helps streamline the review process. When submitting the multi-plan set PDF, bookmarks are required. The text for each bookmark should correspond to the specific plan types, as listed below.
For assistance with electronic plan submittals, refer to Requirements for Electronic Plans
Additional Documents
These items may be required during plan review, as determined by the scope of your project.
- Adult Family Home Requirements
- Critical Areas or Shoreline Land Use Permit
- Geotechnical Report
- King County Health Department Approval
- required for installation of septic tanks or if the dwelling is served by a septic system, and if there is a private well on the property. During review, submit your approval in the form of a letter or stamped plan from the King County Health Department.
- Pool/Spa Plan
- School Impact Fee Form
- Issaquah and Renton School Districts
- Summary Statement of Special Inspections Form
- Title Report
- Sites that are not platted require a title report to locate easements and verify legal status.
- Oil Tank Decommissioning