Smoke and carbon monoxide detector requirements are among the most consistently misunderstood compliance items in Oregon real estate transactions. Oregon has specific statutory requirements for detectors that apply at the point of sale, and sellers who do not meet them create liability for themselves and friction for agents trying to close on time. Knowing what is required, what inspectors document, and what needs to happen before close keeps transactions moving.
Oregon’s Point-of-Sale Detector Requirements
Oregon Revised Statutes require sellers of residential property to provide functioning smoke alarms and carbon monoxide alarms as a condition of sale. The specific requirements have been updated over time and apply to both Oregon and Washington-side transactions, though with some differences.
In Oregon, the seller is required to certify on the Seller’s Property Disclosure that the home has functioning smoke alarms on each level of the home, in each sleeping room, and outside each sleeping area. Carbon monoxide alarms are required in homes with any attached garage, fuel-burning appliance, or fireplace. The alarms must be functioning at the time of transfer.
Oregon also has requirements for interconnected alarms in newer construction and for hardwired alarms in homes that were built or substantially renovated after certain code adoption dates. Battery-operated alarms are acceptable in most older Portland homes that have not been renovated to trigger hardwired requirements.
What Home Inspectors Document
Home inspectors test smoke and CO alarms as part of the standard inspection. They document presence, location, and whether alarms responded to test. Missing alarms, alarms that did not respond to test, and alarms whose battery or unit have exceeded their service life are all noted. Smoke alarms have a manufacturer-recommended replacement interval of 10 years. Alarms that are 10 or more years old may still test positive but are approaching the end of their reliable service life and will be flagged.
Inspectors also note placement deficiencies: a smoke alarm installed on a wall rather than a ceiling, or installed adjacent to a bathroom door where steam can trigger false alarms, is not correctly placed. These are code and safety items that belong in the inspection report.
Who Is Responsible for Correction Before Close
Under Oregon law, the obligation to provide functioning alarms at the point of sale falls on the seller. Missing or non-functioning alarms are not items buyers should be asked to accept as-is in standard transactions. The cost to add or replace smoke and CO alarms is minimal, typically $20 to $50 per unit, and sellers who have not addressed detector compliance before listing should do so before the inspection or in response to the inspection report. This is not a negotiating item in the same sense as a failing roof or an aging HVAC system. It is a statutory compliance obligation.
Combination Units and Placement
Combination smoke and CO alarm units are acceptable under Oregon requirements and are a practical solution for homes that need both. They are available at hardware stores for $30 to $60 and satisfy both requirements in a single device. For older Portland homes with gas appliances, a furnace, a fireplace, and an attached garage, CO detection is a real safety need, not just a compliance checkbox. Buyers who move into a home where the CO alarm was non-functional and the furnace has a cracked heat exchanger are in a genuinely dangerous situation.
Working With Trusted Home Inspections
Every inspection includes smoke and CO alarm testing and documentation of presence, placement, age, and function. Missing or non-functional alarms are flagged clearly as compliance items in the report. Certified Master Inspector dual-licensed in Oregon and Washington, free thermal imaging, same-day reports, 7-day scheduling.
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