Mold Removal Portland: $1,223 to $3,757 + City 10 Sq Ft Rule

National figures; we found no Portland-only mold price.

Do this now: you found mold in a Portland home

1. Find and stop the water, then dry wet materials. The EPA says drying within 24 to 48 hours usually keeps mold from growing.
2. Photograph the mold and any water damage before cleaning.
3. Small patch under about 10 square feet: the EPA says a homeowner can generally handle the cleanup. The CDC says never mix bleach with ammonia or other cleaners.
4. Larger areas, mold after a big leak or sewage, or mold in the ducts: call a remediation company. The EPA says not to run an HVAC system you suspect is contaminated.
5. If the mold came from a sudden leak, call your insurer before work starts.

Is it urgent? When mold needs a pro now

Mold is urgent when it covers more than about 10 square feet, follows a sewage or flood event, is inside heating or cooling ducts, or someone in the home has asthma or a weak immune system. The EPA's 10 square foot line is the point where it recommends following its professional remediation guidance. A small spot on a shower caulk line is not urgent; Portland's own rule calls trace mold on tub or shower caulk de minimis. The CDC does not recommend mold testing; see mold inspection for when testing helps.

Portland's mold rule: certified contractor over 10 square feet

Portland's Property Maintenance Regulations (administrative rule ENB-13.28, effective October 28, 2020) set mold levels for residential property. A "major level" is visible growth over 10 square feet in total, or minor growth on damaged material, and it must be remediated by a contractor holding an active Oregon or nationally recognized third-party mold certification; NORMI is one listed certifier. Ask any mold company which certification it holds and get the number.

The same rule says that where bathroom mold exceeds one square foot, the bathroom must have mechanical ventilation of at least 30 CFM vented to the outdoors, and an operable window does not count. If mold keeps returning on a Portland bathroom ceiling, a fan is usually part of the fix.

Why Portland homes grow mold

Portland's wet season is long. The airport records 0.01 inch or more of rain on 93.3 days a year and 36.92 inches in a normal year, NOAA's 1991 to 2020 normals show. Portland's median home was built in 1966, against a U.S. median of 1980, and 82,545 of its 307,719 housing units (26.8%) were built in 1939 or earlier, the Census Bureau's 2020 to 2024 American Community Survey shows. Older houses with crawl spaces, no bathroom fans and single-pane windows hold moisture, which is where mold starts.

Oregon rules when you sell or need help paying

Oregon sellers must disclose any mold testing or treatment, and the state's Healthy Homes Grant Program funds mold abatement for low-income households and landlords, the Environmental Law Institute's 2024 compilation of state mold laws shows. Portland Housing Bureau partners such as Community Energy Project and Unlimited Choices run repair programs for income-qualified owners; the bureau's page lists no amounts.

Local rules, programs and climate for Portland, from the official pages listed under Sources.

Questions to ask a Portland mold company

1. Which mold certification do you hold, and what is the number?
2. What is your CCB number, and can I see proof of insurance?
3. How will you contain the area, and what will you remove versus clean?
4. Will you find and fix the moisture source, or do I need a plumber or roofer too?
5. Do you also do the testing? (Some owners prefer a separate inspector.)

More Portland help

Leak that caused it: water damage restoration in Portland or plumber in Portland. Roof leaks: roof repair in Portland. National guide: mold removal and remediation cost. Other cities: mold removal in Seattle and mold removal in Sacramento. All prices: home repair costs.