Free Download · May 2026

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.

State-by-state ADU rules in plain language: where they’re allowed, how big, and what the exceptions are
The 7 utility and infrastructure triggers: water meters, electrical panels, SDC fees, stormwater, septic, fire code, and sewer sizing, each with the specific condition that activates it and what it costs
10 due diligence questions to ask before a property goes under offer, gets a lot approval, or gets listed
The jurisdiction wildcard section : why laws are still changing and which county had no ADU rules at all until September 2025
For Property Buyers For Builders For Realtors
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3
states covered: Oregon, Washington & Idaho
$70K+
max on septic replacement alone. That’s before water meters, electrical panels, SDC fees, and stormwater costs that most PNW ADU projects also trigger.
Sep 2025
when Jefferson County, OR adopted its first-ever ADU ordinance, after having zero framework
What’s Inside

What the guide covers

Section 01

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 breakdown
Section 02

The 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+
Section 03

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 question
Section 04

The 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 changes
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