What the Home Inspection Covers in Washington State:
A Guide for Portland-Area Agents
Washington has its own inspector license, its own standards of practice, and its own contract forms. Here is what changes when a Portland agent’s deal crosses the Columbia.
Portland-area agents work transactions on both sides of the Columbia River, and Washington inspections are not identical to Oregon inspections. Washington has its own licensing rules, its own standards of practice, and its own contract forms.
Agents who assume the inspection works the same way in Vancouver and Clark County as it does in Portland can miss differences that affect how they manage due diligence.
This guide covers what changes on the Washington side: who can inspect, what the inspection covers, what Clark County homes tend to need, and how the contingency forms differ.
Washington State Inspector Licensing
Washington requires home inspectors to be licensed under RCW 18.280, the Home Inspector Licensing Act, administered by the Department of Licensing. Licensing requires a 120-hour board-approved Fundamentals of Home Inspection course, 40 hours of field training with an experienced licensed inspector that includes at least 5 actual inspections, and passing an exam with both a state and a national portion. Licenses renew every two years with 24 hours of continuing education.
Oregon certification is separate and does not satisfy Washington’s requirement. An inspector certified only in Oregon is not permitted to perform home inspections for pay in Washington.
When your deal is on the Washington side, confirm the inspector holds a current Washington license. A dual-licensed inspector removes the question and gives you one inspector across your whole service area. Trusted Home Inspections is licensed in both states: Oregon (OCHI #1898) and Washington (DOL #1856). For more on why that matters, see working with a dual-licensed OR/WA inspector.
Washington Inspection Standards
Washington’s Standards of Practice for home inspectors, WAC 308-408C, define what a licensed inspector must inspect and report on. The core scope is close to Oregon’s: structure, roofing, exterior, plumbing, electrical, heating and cooling, insulation and ventilation, and interior components. The wording and some scope details differ, but buyers on the Washington side get a comparable level of evaluation to buyers in Oregon.
Property Considerations on the Washington Side
Clark County and the SW Washington communities of Vancouver, Camas, Battle Ground, and Ridgefield have their own housing stock. Some of it looks like Portland’s Oregon-side inventory. Some does not.
What tends to come up on Washington-side inspections.
- Newer construction is more common. Clark County has seen heavy residential development in recent decades, and a larger share of homes are newer than in Portland’s inner neighborhoods. Newer homes have fewer age-related material concerns but still produce findings tied to maintenance, system age, and construction quality.
- Radon. Clark County, WA sits in EPA Radon Zone 1, and elevated readings turn up across the Portland metro. Testing is the only way to know.
- Sewer laterals. Older Clark County homes with original laterals carry the same cast iron, clay, and Orangeburg concerns as Oregon homes of the same era. A sewer scope, arranged separately through a plumber, makes sense on older homes on both sides of the river.
- Underground oil tanks. Less common than on the Oregon side, but present. Homes with a history of oil heat still warrant a closer look.
- Septic systems. Rural Clark County homes on septic fall under county operation and maintenance rules, and a separate septic evaluation by a licensed provider is the place to get answers.
For radon specifics, see radon testing in Portland transactions.
For more, see the septic system inspection guide.
Washington Inspection Contingency Differences
Washington and Oregon use different standard purchase and sale forms. On the Washington side, the Northwest MLS Form 35 inspection addendum is the common inspection contingency instrument. Its default inspection period is 10 days after mutual acceptance unless the parties agree otherwise, and a buyer who does not respond by the deadline is generally treated as having waived the contingency.
Oregon’s OREF sale agreement handles the inspection period, buyer notices, and repair requests differently. Agents who mostly work Oregon deals and occasionally cross into Washington should review the Washington inspection contingency with their principal or managing broker so they run the Washington timeline correctly.
Seller disclosure differs too. Washington sellers use the statutory disclosure statement under RCW 64.06 (NWMLS Form 17), and Oregon sellers use the form in ORS 105.464. For how the two disclosure rules compare, see Vancouver WA home inspections: what Portland agents should know.
On the Washington side, check three things: the inspector’s Washington license, the Form 35 deadline, and septic status on rural homes. The inspection itself covers much the same ground as in Oregon.
Working With Trusted Home Inspections Across the Metro
Trusted Home Inspections is licensed in Oregon and Washington and inspects across the full Portland metro, including Vancouver, Camas, Battle Ground, Ridgefield, and Washougal on the Washington side. One inspector and one phone number for your whole service area. Russ is a Certified Master Inspector®. Thermal imaging is included at no additional charge on every inspection, most reports go out the same day, and inspections are scheduled seven days a week.
Visit the resources page for real estate agents, schedule an inspection, or call (971) 202-1311.
Washington State Home Inspection FAQ
