Planning Your ADU

A hand drawing construction plans.

From Idea to Reality: Here’s How to Get Started

Building an ADU is a big project, but you don’t have to figure it out alone. Whether you’re using a pre-approved plan or creating something custom, this guide will help you plan with confidence.

Tip: Start with the end in mind

Is this for family? Rental income? Downsizing?  Let your long-term goals guide your decisions now.

Step 1: Check What’s Possible on Your Property

Start by confirming your property is eligible for an ADU.  Consider:

  • Lot size and zoning
  • Existing buildings or features (slopes, streams, trees)
  • Setbacks and height limits

Please refer to our answers to common questions to help inform your property's eligibility.  If you have questions about the constraints and feasibility of building an ADU on your property, you can contact a City planner by calling 425-587-3600 or submit your questions through Our Kirkland.

Step 2: Choose Your Design Approach

Think about who will live there, how much space they’ll need, and if stairs are a concern.  You can:

Step 3: Consider Your Timeline

The process from idea to move-in can take a while. The permitting process for a standard ADU generally takes approximately 3 months with additional time for design and construction. A pre-approved DADU application will take less time.

Step 4: Build Your Team

Most homeowners benefit from hiring at least one professional:

  • Designer or architect
  • Permit consultant
  • Builder or contractor
  • Lender or loan officer

Some designers in our pre-approved program can assist with permitting and project coordination, too.  Want more information? Contact a City planner by calling 425-587-3600 or submit your questions through Our Kirkland.

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