What information does the ADU certificate request?

It asks for owner contact details, parcel and property information, the ADU's location and square footage, and parking information. The owner also signs and dates the certification.

Who completes the Certificate of Accessory Dwelling Unit?

The form is for the property owner to complete. It includes information about the owner and residence, plus a certification that the information is true and correct.

How do I submit the ADU certificate?

Submit the completed form to the City of Duvall Community Development Department at PO Box 1300, 14525 Main Street NE, Duvall, WA 98019.

Duvall, WA · King County

No notary required

Certificate of Accessory Dwelling Unit (ADU)

Property owners use this form to provide Duvall with information about an accessory dwelling unit and certify that the information is accurate.

What this form is

This certificate collects owner and property details for an accessory dwelling unit, including its location, square footage, and parking information. The owner certifies that they understand applicable City requirements and that the information is true and correct under penalty of perjury. City staff sections are included for file, receipt, and department review details.

Who needs it

A property owner completing the certificate for an accessory dwelling unit in Duvall needs to provide the requested property information and sign it.

How to submit it

Submit the completed form to City of Duvall Community Development Department, PO Box 1300, 14525 Main Street NE, Duvall, WA 98019.

About notarization

The owner signs and dates this form without a notary; it includes a certification under penalty of perjury, but no notarized attachment or step is listed.

How to submit this form

1
Download The Certificate
Download the Certificate of Accessory Dwelling Unit (ADU).
2
Complete The Owner And Property Details
Enter the requested owner, parcel, location, ADU size, and parking information.
3
Review And Sign
Read the certification, then sign and date the form as the property owner.
4
Submit The Form
Send the completed form to the City of Duvall Community Development Department at the address listed on the form.

Frequently asked questions

What information does the ADU certificate request?: It asks for owner contact details, parcel and property information, the ADU's location and square footage, and parking information. The owner also signs and dates the certification.
Who completes the Certificate of Accessory Dwelling Unit?: The form is for the property owner to complete. It includes information about the owner and residence, plus a certification that the information is true and correct.
Do I need a notary for the ADU certificate?: No. The owner signs and dates this form without a notary. It includes a certification under penalty of perjury, but no notarized attachment or step is listed.
How do I submit the ADU certificate?: Submit the completed form to the City of Duvall Community Development Department at PO Box 1300, 14525 Main Street NE, Duvall, WA 98019.

Need something notarized?

This Certificate of Accessory Dwelling Unit (ADU) doesn’t need a notary — but if you have another Duvall form that does, a commissioned online notary can help.