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Thinking about adding a second home to your property? Washington has expanded opportunities for ADUs, but zoning, utilities, site conditions, and construction costs still determine what's possible. This free guide walks you through what to consider before moving forward.
From evaluating your property to final inspections, building an ADU involves several important steps. Here's what to expect along the way.
Understand what state law allows, how local requirements differ, and what that means for your property.
Learn how zoning, available space, environmental restrictions, utilities, and site access affect what you can build.
Understand what drives construction costs, why smaller homes can cost more per square foot, and which utility questions to ask early.
Explore common ADU layouts, pre-approved plans, and the steps involved from planning through construction.
Review financing options, potential tax considerations, common challenges, and a practical checklist to help you plan your next steps.
You have space on your property and want to understand whether building an additional home is possible.
You're considering a separate living space for parents, adult children, or extended family while keeping everyone close.
You want to understand the costs, requirements, and practical considerations before investing in a rental ADU.
Find out what goes into building an ADU in Washington. Get the free nine-page guide covering property requirements, construction costs, utilities, permits, financing, and the steps from planning to completion.
Hilson Homes builds custom and semi-custom homes throughout Washington. If you're considering an ADU and want to discuss what's possible on your property, we'd welcome the opportunity to learn more about your project.
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