Know What the MLS Doesn’t Tell You Before You Buy, Build, or List.
Oregon, Washington, and Idaho ADU rules in plain English. Plus the infrastructure category most budgets skip: water meters, electrical panels, SDC fees, stormwater, fire code. Each one has a trigger. On most PNW properties, more than one gets crossed.
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What the guide covers
ADU Rules by State
Oregon, Washington, and Idaho rules in plain English. Where ADUs are allowed, how large they can be, what the owner-occupancy rules are, and what the exceptions are that most guides miss.
OR · WA · ID state-by-state breakdownThe 7 Hidden Costs
Water meter upgrades. Electrical panel work. SDC fees. Stormwater requirements. Fire-rated construction. Septic replacement. Sewer line sizing. Each with a real dollar range and the specific condition that activates the cost.
Cost ranges from $2,000 to $70,000+10 Questions to Ask First
A due diligence checklist for buyers, builders, and realtors. Each question flags a known ADU project trigger scenario, with a plain-English explanation of what you’re actually checking for and why it matters.
Buyer · Builder · Realtor labels per questionThe Jurisdiction Wildcard
ADU laws are still being written. This section explains why a guide like this has a date on it, which changes to watch for, and why the only way to know what’s true for your specific property is to run the data on that address.
Real examples of recent jurisdiction changesKnow before you commit. Not after.
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