In Portland, the city’s residential permit page lists replacing or repairing siding that is not required to be fire-resistant as work that does not need a building permit. Gresham’s building page does not say either way about siding, so call the city to confirm for your address. In both cases, the work still has to meet Oregon’s building code, permit or not.
What Portland says
The City of Portland’s residential permit page includes, in its list of home repair projects that do not need permits, “Replace or repair siding that is not required to be fire-resistant.” The same page adds that even when a building permit is not needed, the project must meet the Building and Zoning Code requirements. For questions about whether your siding must be fire-resistant, the page points to the city’s General Inquiries line at 503-823-7300.
This applies to one- and two-family homes. Larger buildings follow different rules.
What Gresham says
The City of Gresham’s building permits page says a permit is needed to construct, enlarge, alter, repair, move or change the occupancy of a building or structure. The page I reviewed does not mention siding by name, and it links to a separate “projects that don’t require a permit” list. Permit Services is listed at 503-618-2845. Because the wording is general, call before assuming your project is exempt.
Oregon’s residential code is statewide, and other Oregon jurisdictions list siding repair and replacement that is not required to be fire-resistive as a permit exemption. Gresham may treat it similarly, but confirm with the city rather than guess.
Why “fire-resistant” matters
Some walls must be fire-resistant, usually because they sit close to a property line or another building. Your siding is not exempt from a permit if it falls in that category. Portland does not define it on the page above, so ask the city about your lot if your house sits tight to a neighbor.
No permit does not mean no rules
Even exempt work must follow code. Three things matter most for homeowners.
The wall must drain
Oregon’s residential code (section R703.1.1) requires exterior walls to be built so that water getting into the wall can drain out. That usually means a water-resistive barrier and a drainage space of at least 1/8 inch behind the siding, with integrated flashings, unless an approved drainage-enhanced barrier is used, as described in this City of Eugene form quoting the code. Some jurisdictions require a signed acknowledgment. See our rainscreen and house wrap guide.
Older homes: lead and asbestos
For homes built before 1978, federal lead-safe rules apply to contractors who disturb painted surfaces. In Oregon those are administered by the Oregon Health Authority and the CCB. Oregon DEQ lists siding among materials that may contain asbestos and generally requires an accredited asbestos survey before renovation of residences built before 2004, with an exemption for owner-occupants doing their own work. Confirm DEQ’s current rules, since sources vary on details.
Licensing
In Oregon, a contractor doing this work for pay must be licensed by the CCB. Check it using our CCB license guide.
Why Dave cares about this
A permit question is really a quality question. The rules exist so walls shed water, stay attached in wind, and do not become a fire or health problem. A contractor who treats code as optional when no inspector is coming is the one to worry about. Ask any bidder how they would build the wall if an inspector were standing there, and expect the same answer whether a permit is pulled or not.
Other things that can trigger a permit
Siding is often one piece of a bigger job. These can bring their own permit requirements:
- Structural changes, such as moving or enlarging window or door openings
- Replacing windows or sliding glass doors, which can have a separate permit or inspection in some cities
- Building or rebuilding a deck
- Adding exterior insulation or changing the wall assembly
- Work in a historic district or HOA with design review
Ask your city about each.
How to find out for your address
- Call the permit line: Portland General Inquiries 503-823-7300, Gresham Permit Services 503-618-2845.
- Tell them whether you are replacing like for like, changing materials, doing structural work, and how close the wall sits to the property line.
- Ask what is required at inspection, if anything.
- Ask your HOA, if you have one.
- Get the answer in writing or note the date and who you spoke with.
Your contractor should know this process. Dave works across Portland metro and East County cities, so he deals with this regularly. If a permit is needed, ask who pulls it and who pays for it before you sign.
Quick answers
- Do I need a permit to repair a few boards? Typically not; the city pages list repairs of non-fire-resistant siding as exempt in Portland.
- Do I need one in Gresham? Call 503-618-2845. The public page does not spell out siding.
- Does a new weather barrier need a permit? Not by itself, but it must meet code.
- Who is responsible for compliance? The owner and the contractor. Hire licensed.
- Does the permit raise my cost? If one is required, there will be a fee. Dave notes it in your estimate. See our cost guide.
Next step
Dave Shaffer has about 40 years of hands-on siding experience and works in Gresham, Portland and across East County. He can tell you what is typically required for your project. CCB #153635, licensed, bonded and insured.
Call or text Dave: 503-260-7647. Free estimates.