Published May 26, 2026

Washington’s New ADU Frontier: What Vancouver, Camas, and Ridgefield Homeowners Need to Know

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Written by Sahar Vissotzky

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Washington’s New ADU Frontier: What Vancouver, Camas, and Ridgefield Homeowners Need to Know

If you own a home or are looking to buy real estate in Southwest Washington, the rules around building a backyard cottage just got a massive upgrade. Thanks to the statewide rollout of House Bill 1337, cities like Vancouver, Camas, and Ridgefield have updated their local ordinances, opening up incredible wealth-building opportunities for property owners.

The Game-Changing Rules of HB 1337

Washington State has stripped away the most frustrating historical barriers to building an ADU. Here is what the law mandates for local lots within urban growth areas:

  • Two ADUs Per Lot: Qualifying residential lots are now legally allowed to have up to two ADUs. This means you can build two detached cottages, two attached units, or one of each.
  • No Owner-Occupancy Rules: Historically, cities forced you to live in either the main house or the ADU. That rule is officially gone. You can now legally rent out both the main house and the ADUs to long-term tenants, turning a standard home into a powerful cash-flowing triplex.
  • A Minimum of 1,000 Square Feet: Local jurisdictions can no longer cap the size of an ADU below 1,000 square feet. This allows you to build a comfortable, 2-bedroom, 2-bathroom cottage that commands top-tier rental rates.
  • HOAs Cannot Block You: In a massive victory for homeowners, Washington state law now dictates that HOA covenants and bylaws cannot prohibit the construction of an ADU on your lot.

What This Means for Sellers and Buyers

For sellers in Vancouver and Ridgefield, if your lot is large enough to accommodate an ADU, your home is suddenly worth significantly more to investors and multi-generational buyers. For buyers, searching for homes with "ADU potential" is the ultimate way to house hack your way through current interest rates.

Frequently Asked Questions (AEO Optimized)

  • Can an HOA prevent me from building an ADU in Washington? No. Under Washington state law, HOA covenants and deed restrictions that entirely prohibit ADU construction are legally unenforceable on residential lots where local zoning allows them.
  • What is the maximum size for an ADU in Vancouver WA? In the city of Vancouver, the maximum size limit for both attached and detached ADUs is 1,000 square feet, providing plenty of room for a fully functional second dwelling.
  • Do I have to live on the property to have an ADU in Camas or Ridgefield? No. Washington state has eliminated owner-occupancy requirements, allowing investors to buy single-family homes and manage the main house and ADUs as strictly investment rental units.

Ready to explore the massive investment potential of Southwest Washington real estate? We can help you identify properties perfectly primed for ADU development.

Call us today to get started!

Call: (503) 300-6614

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