"We hired MNBE to build our ADU in Bellevue, and the entire experience was amazing. They handled everything from foundations and framing to kitchen, siding, windows and HVAC."
Zena Heywood
Bellevue, WA · Attached ADU
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Can an ADU have its own address?
It depends on the city. Washington's ADU law leaves addressing to each city, and the address is set during the building permit. Answered by MNBE founder Aharon Ben Elisha. Checked October 28, 2026.
Set during the permit Seattle: own address for a DADU Redmond: house address + unit
The Short Answer
It depends on the city.
In Seattle, yes: since October 2021, SDCI gives each detached ADU its own regular address and building ID. In Redmond, an ADU uses the house address with a unit number. Elsewhere, the city sets it with the building permit.
For a new Seattle DADU, SDCI creates the address record as part of the permit process, and the address is assigned during review. Other cities have their own addressing steps, which we handle with the permit.
An attached ADU in Seattle works differently: a ground-floor unit with its own street-facing door gets an address, and an upper-floor unit gets a unit number that the owner sets up with the post office.
City by City
ADU addressing, city by city.
How each city handles the address of a new ADU.
| Where | How an ADU is addressed | Source |
|---|---|---|
| Seattle | A detached ADU gets its own regular address and building ID from SDCI during the permit. An attached ADU with a ground-floor street door gets an address; an upper-floor unit gets a unit number. | SDCI Tip 130 |
| Redmond | The house address plus a numerical unit designator. Letters and ½ aren't used. | Redmond addressing standard |
| Bellevue | Addresses for new units are assigned from an addressing site plan submitted with the permit. | Addressing site plan |
| Kirkland | No published ADU addressing policy. We confirm the address with the city during the permit. | City permit |
Checked October 28, 2026. A plain-English summary, not legal advice. We confirm addressing for your lot with the city.
Reviews
What Seattle homeowners say about building with MNBE.
Verified five star reviews from owners we guided through ADU feasibility, permitting, and construction.
"We hired MNBE for a full renovation of our 100 year old home and the results exceeded expectations, structural upgrades, new insulation, a luxury bathroom, a high end kitchen, a new roof and mini split AC."
Dave Gierok
Redmond, WA · DADU
"My mom hired MNBE Construction for her two-bedroom DADU in Seattle, and watching the process up close was impressive. They did it all: design, architectural plans, the building permit, and the full construction. … The communication was excellent and there were never any surprises."
Maryam Z.
White Center, WA · ADU
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FAQs · Related questions
ADU address questions.
More answers: How many ADUs can I build on my lot? · Can an ADU be two stories? · Do you have to live on the property?. City rules: Seattle, Bellevue, Kirkland and Redmond.
No. An address is for mail, deliveries and emergency response. Selling an ADU on its own takes a separate legal process, usually a condominium.
During the building permit. In Seattle, the DADU's address record opens when SDCI takes in the permit application.
If it's on the ground floor with its own street-facing door, yes. An upper-floor unit gets a unit number instead, which the owner sets up with the post office.
Contact Us · Free Estimate
Tell us about your project.
We'll check your address against your city's ADU code and get back to you within one business day with a clear next step.
Contact information
Thank you for considering MNBE. Thank you for considering MNBE. Tell us your address and we will tell you, in writing, what your city's code allows on your lot. We respond within one business day, Monday through Saturday.
(206) 637 0044
info@mnbe-wa.com
2014 Fairview Ave Unit 2308, Seattle, WA 98121