Why Build an ADU?

Flexible Living. Extra Income. Community Impact.

Building an ADU creates options and lasting value. 

For Your Family

• Keep loved ones close while giving everyone their own space.
• Create a safe, accessible home for aging parents or a caregiver.
• Provide independence for adult children or college grads returning home.

For Your Finances

• Rent your ADU to generate steady income.
• Sell a detached ADU for extra income
• Offset your mortgage or retirement costs.
• Boost your property value with a flexible housing unit.

For Your Community

• Help address Kirkland’s housing needs by adding more options.
• Offer a more affordable place to live for teachers, caregivers, and service workers.
• Create walkable, multi-generational neighborhoods with character.

ADU Toolkit Home

Return to the ADU Toolkit landing page.

What is an ADU?

An Accessory Dwelling Unit (ADU) is a smaller, independent home located on the same property as a primary residence. Learn more here!

Explore Kirkland’s Pre-Approved Plans

Save Time. Save Money. Start Building Sooner.

Planning Your ADU

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

Paying for Your ADU

An ADU is a serious investment—but it’s also one that can pay off over time through rental income, selling the unit, increased property value, or family support. Let’s talk cost, financing, and how to plan ahead.

ADU Permitting Process

Step-by-Step Guidance to Get Your Project Approved

Moving In or Renting Out

What Happens After Your ADU Is Built

Why the City Supports ADUs

Building a More Inclusive, Affordable, and Sustainable Kirkland