Tualatin Homes Have a River. Your Inspector Should Know What That Means.

The Tualatin River's floodplain runs through the city. The soils are clay. The housing spans 60 years of construction eras, each with its own inspection profile. As a Certified Master Inspector® with 10+ years of inspection experience and 12 years of contractor experience, Russ knows this market from the crawlspace up.

Russ Motyko, Certified Master Inspector performing a home inspection
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Tualatin Housing Market

$638,900
Median sale price
22 days
Median days on market
24
Homes sold last month
43
Homes for sale now
Live Market Data · Updated March 2026
Source: Redfin Data Center

These Homes Have History. So Do I.

A Tualatin Oregon home representative of the Washington and Clackamas County housing stock Russ inspects
Tualatin, Oregon

Tualatin is unlike most cities in the Portland metro. The river doesn't just run near it, it runs through it. The floodplain shapes the drainage conditions for entire neighborhoods. Clay soils throughout the Tualatin Valley swell when wet and shrink when dry, which puts steady pressure on foundations, retaining walls, and crawlspace vapor barriers year after year. And the city straddles two county lines, putting it in reach of dual radon zone exposure that most buyers don't know about until someone tells them.

Not only do I have 10 years of inspector experience, I have also worked as a Contractor for 12. My specialty is difficult and high-end framing jobs, but I have replaced roofs, built, painted, and installed cabinets, ran wiring, poured concrete, waterproofed showers, set tile, replaced siding and windows, installed drywall, and set doors. That background is what lets me read a home the way a builder does, and spot what they got wrong.

When I walk a 1980s ranch in the Tualatin Commons area, I already know to check under the kitchen sink for the gray plastic fittings that indicate polybutylene plumbing. When I drop into the crawlspace of a 1970s home near the river corridor, I know what 50 years of seasonal moisture does to a vapor barrier that was never replaced. These aren't things you learn from a checklist. They come from doing this work long enough that Tualatin homes stop surprising you.

I hold Certified Master Inspector® certification (top 3% of the industry), Oregon OCHI license #1898, and Washington DOL license #1856. Every inspection includes free thermal imaging.

Tualatin Homes by Construction Era

Tualatin grew in three distinct waves. Each produced a different housing profile with a different set of inspection priorities. Understanding which era you are buying into changes what the inspection needs to focus on.

Pre-1965 Homes

Tualatin's oldest residential blocks grew up alongside its industrial base near the river corridor. Modest ranch homes and early split-levels from the 1950s and early 1960s are the city's oldest housing, and they carry the full profile of that era's systems at or past end of useful life.

Galvanized steel supply pipes were standard through the early 1960s. After 60-plus years of internal corrosion, the diameter has narrowed, pressure has dropped, and discoloration appears at fixtures. Full replacement runs $10,000 to $25,000. Federal Pacific Stab-Lok electrical panels appear in some homes from the late 1960s and are consistently flagged by insurance underwriters.

Cast iron drain lines in these homes have been in Tualatin's clay-heavy, wet river-corridor soils for six decades or more. Root intrusion and soil movement are facts of life here. A sewer scope is not optional on any pre-1965 Tualatin home.

Common findings in pre-1965 homes
Galvanized steel supply pipes
Corroded internally after 60+ years. Reduced pressure, discoloration at fixtures. Replacement $10,000 to $25,000.
Federal Pacific Stab-Lok panels
Documented safety issues. Insurance carriers routinely flag and require replacement.
Cast iron sewer lines at end of life
60-year-old cast iron in clay-heavy river corridor soils. Root intrusion and scale are consistent findings. Sewer scope is high-priority.
Crawlspace moisture and vapor barrier failure
No modern waterproofing managing decades of river-corridor moisture exposure. Wood rot and pest activity follow.
Roofing at or past service life
60-year-old homes have often been re-roofed once or more. Current roof age and layering documented in report.

1965–1985 Homes

This is the dominant housing era in Tualatin. The city's planned subdivision growth from the late 1960s through the mid-1980s filled in what had been mostly agricultural land, producing the ranch homes and two-story colonials that make up a significant share of Tualatin's active inventory today. This era also generates the most consequential inspection findings in the market.

Polybutylene plumbing is the single most important finding in Tualatin's 1980s homes. It was installed widely during the city's growth peak, degrades from chlorine exposure in municipal water, and fails at fittings suddenly rather than developing slow leaks. Insurance carriers increasingly require replacement before coverage is offered. Identifying it before closing is the inspection contingency doing exactly what it is designed to do.

Original vapor barriers from this era are now 40 to 50 years old. They have torn, shifted, and degraded in most homes where they were not upgraded. The low-lying drainage environment of the Tualatin River corridor makes crawlspace moisture nearly universal in homes from this period.

Common findings in 1965–1985 homes
Polybutylene plumbing (1978–1985 builds)
Sudden fitting failure from chlorine degradation. Insurance frequently requires replacement. Cost: $10,000 to $20,000.
Degraded crawlspace vapor barriers
40 to 50 years of river-corridor moisture exposure. Most have not been upgraded. Wood rot and mold follow.
Federal Pacific and Zinsco panels
Documented safety concerns. Insurance carriers frequently flag or decline coverage on homes with these panels.
Sewer lines approaching end of useful life
Pre-1985 drain infrastructure in clay soil with root intrusion. Sewer scope recommended on every home from this era.
Roofing and sealant age
40-plus-year-old homes have often been re-roofed once. Age, condition, and remaining life are always documented.

1985–2005 Homes

Tualatin's remaining parcels filled in through the late 1980s and 1990s with newer subdivision development. These homes benefit from updated building codes, but they are not defect-free and some of Tualatin's core inspection concerns still apply regardless of home age.

CPVC plumbing replaced polybutylene from about 1995 through 2005. In the oldest 1990s installations, it is now 25 to 30 years old and showing oxidative brittleness at fittings near heat sources. Composite siding on 1990s homes absorbs moisture and fails from the bottom up, particularly where grading at the foundation is imperfect. In Tualatin's low-lying terrain, imperfect grading is common.

Radon is as relevant in a 1998 build as a 1975 build. It's a soil gas. Any home in Tualatin's dual-county radon zone warrants testing regardless of age.

Common findings in 1985–2005 homes
CPVC plumbing brittleness (1990s homes)
25 to 30 years old in oldest installations. Cracking at fittings and discoloration near heat sources.
Composite siding failure (1990s construction)
Hardboard and wood-fiber siding absorbs moisture and fails from the bottom up. Tualatin's low terrain compounds grading issues.
Roofs at or beyond service life
25-year shingles from the late 1990s are past expected lifespan. Replacement $10,000 to $20,000.
Grading and crawlspace moisture (even in newer builds)
Clay soil plus imperfect grading directs water toward crawlspaces. Compounds over multiple wet seasons.
Radon (regardless of home age)
Radon is a soil gas. A newer home does not mean lower radon. Every Tualatin purchase should be tested.

2000s and Newer Construction

Tualatin's remaining infill and southern neighborhoods filled in through the 2000s with newer suburban development adjacent to Sherwood and the Washington County urban growth boundary. These homes tend to be in better overall condition. But newer construction does not mean defect-free construction.

Grading and drainage on recently developed lots can still be inadequate. In Tualatin's clay-heavy soil, even modest grading errors contribute to crawlspace moisture over time. HVAC installation quality varies between builders. And radon is a factor in any home, regardless of when it was built. The gas comes from the soil, not the structure.

If your home was built within the last few years and is still within the builder's one-year warranty window, the 11-month warranty inspection documents defects before that deadline passes. The clock starts at closing. Schedule before you hit month 10.

Common findings in 2000s and newer homes
Grading toward foundation
Clay soil plus imperfect finish grading sends water toward the crawlspace. Common and expensive post-close.
HVAC installation defects
Improperly sealed ducts, disconnected exhaust vents, and balancing errors are consistent in newer construction.
Window and door flashing deficiencies
Improper flashing allows moisture into wall assemblies that look perfect from the outside.
Radon (yes, even in new homes)
Radon is a soil gas. A newer home in Tualatin's dual-county radon zone still warrants testing.
11-month warranty items (if still in warranty)
For buyers in newer developments still within the builder warranty window, see our 11-month warranty inspection.
Home Risk Quiz

Is Your Dream Home Hiding Significant Issues?

See Your Potential Home Through an Inspector's Eyes.

Transform your observations into a clear risk profile. In just two minutes, you will receive a breakdown of what a professional inspector would be concerned about based on what you saw.

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8 quick questions. No contact info required.

1 of 8
01

How old is the home?

You'll have the year built from the listing or the seller. Home age is the single biggest driver of inspection risk.

02

What did the roof look like from the street?

Look for curling shingles, dark patches, missing granules, or visible moss. A good look at the roof from the ground can tell you more than you'd think.

03

Did you notice any musty smell inside the home?

A musty or earthy odor is the most reliable clue buyers can detect about crawlspace moisture or mold — even without going under the house.

04

Did you see the electrical panel? What did it look like?

It's usually in a utility room, garage, or hallway. Federal Pacific (orange breakers) and Zinsco panels are known fire risks and still common in Portland-area homes from the 1960s to 1980s.

05

Did you notice any water stains on ceilings or walls?

Look near the corners of ceilings, under windows, and in bathrooms. Even old-looking stains matter — they show water has been in places it shouldn't be.

06

How did the overall condition of the home feel?

Trust your gut. A home that feels well-loved and maintained usually is. One that feels neglected almost always has deferred items hiding out of sight.

07

Did the home have a finished basement, addition, or garage conversion?

These are some of the most common places to find unpermitted work. A finished space isn't automatically a problem — but without permits, there's no record of whether it was done safely.

08

Where are you in your homeownership journey?

This helps us tailor your results to your situation.

Tualatin Area by Area

Tualatin's neighborhoods reflect its development history. Where a home sits in the city tells you a lot about its age, drainage context, and likely inspection profile.

Riverfront and Old Town Core
Pre-1970 — deepest risk profile

The oldest residential blocks near Tualatin's original downtown and the river corridor contain the city's most complex inspection profiles. These homes have the deepest histories of layered ownership and system updates, and the most direct exposure to the river corridor's drainage conditions. Buyers here should budget realistically for system updates and expect a thorough inspection that takes time to document properly.

Tualatin Commons and Central Neighborhoods
1980s–1990s — polybutylene era

The planned neighborhoods surrounding Tualatin Commons are the heart of the city's 1980s and 1990s subdivision development. Ranch homes and two-story colonials on curvilinear streets dominate. Polybutylene and CPVC plumbing eras are well represented. Crawlspace moisture from the low-lying terrain is a consistent concern. Sewer scope recommended on all pre-1995 homes in this area.

South Tualatin and I-5 Corridor
2000s and newer

Tualatin's newer southern neighborhoods along the I-5 corridor border Sherwood and the Washington County urban growth boundary. Homes tend to be in better overall condition, but drainage in clay soils is still a concern, radon testing is still warranted, and newer construction defects still show up. Being newer does not exempt a home from a thorough inspection.

Nyberg Area and East Tualatin
Mixed eras — Lake Oswego/Tigard border

East Tualatin borders Lake Oswego and Tigard and blends into those markets. Housing ages and prices vary. This area has seen significant commercial and mixed-use development in recent years. Residential properties in transition zones warrant attention to adjacent land uses and their influence on drainage and soil conditions, particularly where infill development has disturbed established grades.

Tualatin Country Club Area
1970s–1990s — established residential

The neighborhoods around the Tualatin Country Club feature some of the city's more established residential streets, with mature trees, larger lots, and homes that are now 30 to 50 years old. These properties are well past the point where deferred maintenance shows up clearly. Roof systems, plumbing, and crawlspace conditions all need careful attention, and the drainage environment remains a factor throughout.

Tualatin Hills Area (Washington County side)
Mixed eras — dual-county boundary

Properties on the Washington County side of Tualatin's city limits sit within the broader Portland metro radon exposure area rather than the Zone 1 designation that applies in Clackamas County. The radon argument is the same either way: test every property. Clay soils and seasonal drainage patterns apply throughout, and the Washington County portion includes homes from multiple decades with the inspection profiles you would expect from each.

What Makes Tualatin Homes Different to Inspect

Tualatin's river corridor, clay soils, and dual-county radon exposure create inspection concerns specific to this part of the Portland metro.

River Corridor Crawlspace Moisture

The Tualatin River's floodplain creates a low-lying drainage environment that affects crawlspaces throughout the city's older residential core. Clay soils with limited permeability mean that water entering a crawlspace has nowhere to drain quickly. It saturates and sits. Original vapor barriers from the 1970s and 1980s are 40 to 50 years old and have degraded in most homes where they were not upgraded. Wood rot in floor framing and mold on structural members are the consequence. We physically enter every crawlspace on every inspection. Not from the hatch. All the way in.

Most consistent finding in older Tualatin homes

Expansive Clay Soils

The Tualatin Valley's clay soils swell when wet and shrink when dry. This seasonal movement puts gradual pressure on foundations, retaining walls, and exterior grading. It also makes every imperfection in a home's drainage detail worse over time. A downspout that drains two feet from the foundation in a sandy-soil city becomes a crawlspace moisture problem in Tualatin. Grading, drainage, and exterior drainage connections are documented carefully on every Tualatin inspection.

Foundation settling and drainage issues compound yearly

Dual-County Radon Exposure

Tualatin is one of the few cities in the Portland metro that straddles two counties with two different radon designations. The Clackamas County portion carries EPA Radon Zone 1, the highest possible rating. The Washington County portion sits within the broader Portland metro elevated radon exposure area. Either way, the answer is the same: test every property. Radon is colorless, odorless, and the second-leading cause of lung cancer in the United States. Your neighbor's test result does not predict yours.

Spans EPA Zone 1 and elevated metro radon area

Everything We Check in a Tualatin Home

Every inspection covers all accessible systems and components, roof to crawlspace. We physically enter attics and crawlspaces. We operate every system we can safely access. We do not check boxes. We evaluate the home.

Roof & Attic

Shingles, flashing, gutters, attic insulation, ventilation, and moisture.

Electrical

Panel, breakers, wiring type, outlets, GFCI and AFCI protection.

Plumbing

Supply pipe material, drain lines, water heater, pressure, and fixtures.

HVAC

Furnace, AC, heat pump, ductwork, and distribution. Age and condition noted.

Foundation & Structure

Cracks, settling, retaining walls, and visible structural framing.

Crawlspace

Full physical entry. Moisture, vapor barrier, insulation, and wood rot.

Interior

Walls, ceilings, floors, windows, doors, and built-in appliances.

Exterior & Grading

Siding, deck, driveway, grading, and drainage away from foundation.

Free Thermal Imaging on Every Tualatin Inspection

In a city where crawlspace moisture is a near-universal concern and clay soils make drainage a constant variable, the infrared camera is essential equipment, not optional. It finds moisture inside wall assemblies and floor systems before visible damage appears. It also catches insulation gaps, HVAC leaks, and electrical hot spots. Included at no extra charge on every inspection.

Learn More →
Dual-County Radon Zone

Radon Testing in Tualatin

Tualatin is one of the few cities in the Portland metro that straddles two counties with two different radon zone designations. The Clackamas County portion carries EPA Radon Zone 1, the highest possible designation for indoor radon potential. The Washington County portion sits within the broader Portland metro elevated radon exposure area.

Either way, the answer is the same: test every property. Radon is a colorless, odorless radioactive gas produced by the natural breakdown of uranium in soil and rock. It enters homes through foundation cracks, crawlspace openings, and soil contact points. It's the second-leading cause of lung cancer in the United States.

Your neighbor's test result does not predict yours. Radon levels vary from property to property based on specific soil conditions, foundation type, and ventilation. The only way to know what is entering the home you are buying is to run a test on that specific home. At $150 added to your inspection, radon testing in Tualatin is not a question.

Learn About Radon Testing →
Radon facts for Tualatin buyers
#2
Second-leading cause of lung cancer in the U.S. After smoking. Responsible for about 21,000 deaths per year nationally.
1 in 4
Portland metro homes test above EPA action level The 4 pCi/L action threshold is exceeded in roughly one in four homes tested across the metro area.
48h
Test takes 48 hours Continuous electronic monitor placed at the start of the inspection. Digital results delivered promptly.
$150
Added to your inspection Standalone testing is $195. Add it at booking and save $45.

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Tualatin Home Inspection FAQs

Questions buyers in Tualatin and the surrounding area ask most before booking.

Yes. Crawlspace moisture is among the most consistent findings we document in Tualatin, particularly in homes from the 1970s and 1980s. The Tualatin River's floodplain creates a low-lying drainage environment throughout the city's older residential core. Clay soils with limited permeability mean that water entering a crawlspace has nowhere to drain quickly. Original vapor barriers from the 1970s and 1980s are 40 to 50 years old and have degraded in most homes where they were not upgraded. We physically enter every crawlspace on every inspection. Free thermal imaging is included and is especially effective at catching moisture that has migrated into floor systems before it becomes visible.
Polybutylene is a gray plastic plumbing material installed widely in Oregon homes from the late 1970s through mid-1990s. It was sold under brand names including Quest and FlowGuard. Chlorine in municipal water degrades it over time, and fittings fail suddenly rather than slowly. Tualatin's 1980s housing stock has a meaningful concentration of polybutylene because it was installed during the city's most active subdivision growth period. Insurance carriers have increasingly moved to requiring replacement before offering coverage. Replacement typically runs $10,000 to $20,000. Finding it during inspection converts a potential post-closing emergency into a pre-closing information item.
Tualatin spans both Washington and Clackamas counties. Clackamas County carries EPA Radon Zone 1 designation, the highest possible level indicating elevated indoor radon potential. Washington County properties are within the broader Portland metro radon exposure area. Either way, testing is warranted. Radon is colorless, odorless, and the second-leading cause of lung cancer in the U.S. Your neighbor's test result does not predict yours, because radon levels vary from property to property based on soil conditions, foundation type, and ventilation. The only way to know what is entering the specific home you are buying is to test it. Radon testing is $150 added to your inspection.
For any Tualatin home built before 1990, yes. Cast iron sewer lines in Tualatin's clay-heavy river corridor soils have been under significant stress since installation. Soil movement, root intrusion, and six decades of service life produce consistent findings when these lines are scoped. A sewer line replacement costs $8,000 to $20,000 and is entirely your expense after closing if it was not discovered and negotiated beforehand. We can refer you to a trusted plumber who performs sewer scope inspections, typically scheduled the same day as the home inspection.
Tualatin home inspections start at $395 for homes up to 1,000 sq ft and scale by square footage up to $795 for homes up to 5,000 sq ft. Free thermal imaging is included at every price point. Radon testing is $150 when added to an inspection. See full pricing at trustedhome.org/pricing.
Most Tualatin home inspections take 2.5 to 4 hours depending on the size, age, and condition of the home. Older homes with large crawlspaces and multiple findings typically run toward the longer end. Most reports go out the same day. After you receive your report, call or text with any questions. Unlimited follow-up is included.
Thermal imaging is included at no extra charge on every inspection. Competitors in the Portland metro typically charge $150 to $250 for this as a separate add-on. Russ includes it because the infrared camera consistently finds moisture that has migrated into floor systems and wall assemblies, insulation gaps, and electrical hot spots, all of which are invisible to the eye. In Tualatin, where crawlspace moisture is a near-universal concern in older homes, it is essential equipment. Learn more about thermal imaging.
The Certified Master Inspector® (CMI®) designation is the highest credential in the home inspection profession, held by the top 3% of the inspection industry. It requires a verified track record of completed inspections, education, and peer review. Russ is Oregon City's only Certified Master Inspector® with 10+ years of home inspection experience and 100+ inspectors trained, serving Tualatin and the full Portland metro. Learn more about the CMI® designation.
Yes. Trusted Home Inspections is veteran-owned and offers a 10% military discount for veterans, active duty, reservists, National Guard members, and military families. Mention your service when you book. See full details at trustedhome.org/military-discount.
That decision is yours and your agent's to make. During the inspection contingency period, you can negotiate a price reduction, request repairs or credits, or walk away. None of those options exist after closing. The report is your documentation. Russ is available after delivery to help you understand what is critical, what is manageable, and what requires a specialist to evaluate further.

Serving Portland Metro & Southwest Washington

Available 7 days a week within a ~35-mile radius of Portland. Not sure if we cover your area? Just call.

~35-mile radius from Portland
Available 7 days a week
Dual-licensed OR & WA
Oregon state-licensed home inspector seal
Oregon Certified OCHI Lic. #1898
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Washington Licensed DOL Lic. #1856

Multnomah County home inspections. Portland and the rest of Multnomah County are full of older housing stock, including 1920s craftsman bungalows in SE Portland, Pearl District lofts, and mid-century homes in NE Portland. Older homes mean knob-and-tube wiring, cast iron drains, and aging foundations. I’ve inspected hundreds of homes across Multnomah County and know exactly what to look for in each neighborhood.

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