Mercer Island, WA · King County
Accessory Dwelling Unit
This checklist guides Mercer Island applicants submitting an accessory dwelling unit land use application and its required supporting materials.
What this form is
Use this checklist when applying for Mercer Island review of an accessory dwelling unit. It identifies application materials, including a project narrative, code compliance matrix, title report, and development plan set, and provides space to certify that the submission is complete and accurate. Some listed materials are conditional or optional, and the code official may require additional documentation.
Who needs it
Applicants proposing an accessory dwelling unit on a single-family or middle housing property in Mercer Island should use this checklist.
How to submit it
Submit it to the city department named on the form; check the city website for current contact details.
About notarization
This checklist is signed and dated without notarization; separate ownership and agent-authority affidavits listed as attachments must be signed before a commissioned online notary.
How to submit this form
- 1
Download The Checklist
Download the Accessory Dwelling Unit PDF checklist.
- 2
Complete The Checklist
Prepare the listed application materials and sign and date the certification.
- 3
Gather Supporting Materials
Include required supporting items; provide conditional affidavits if applicable and a Concurrent Review Form only if requesting consolidated review.
- 4
Submit To The City
Submit it to the city department named on the form; check the city website for current contact details.
Frequently asked questions
- What is the Accessory Dwelling Unit checklist for?
- It lists materials for a Mercer Island accessory dwelling unit land use application and includes a certification for the applicant to sign and date.
- What materials does the checklist request?
- It lists a Development Application Form, project narrative, code compliance matrix, title report, affidavits when required, development plan set, and fees. A Concurrent Review Form is optional.
- Do I need a notary for the Accessory Dwelling Unit checklist?
- No. Sign and date this checklist without notarization. Separate ownership and agent-authority affidavits listed as attachments must be signed before a commissioned online notary.
- How do I submit the Accessory Dwelling Unit checklist?
- Submit it to the city department named on the form; check the city website for current contact details.
Need something notarized?
This Accessory Dwelling Unit doesn’t need a notary — but if you have another Mercer Island form that does, a commissioned online notary can help.