Residential drafting in Oregon City, Oregon
Oregon City is one of the oldest cities in the state, and its housing shows it. Victorians, early twentieth century Craftsman bungalows, and a historic downtown grid sit alongside newer development, and historic overlays affect a meaningful share of the older neighborhoods.
The bluff is the other defining feature. Elevation changes are dramatic across short distances, and geologic hazard overlays apply to steep slopes and areas with a high water table. On those parcels, the geotechnical and retaining questions come before the floor plan.
Older houses here bring the usual archaeology: stone or early concrete foundations, staged additions, altered openings, and permit records that do not match what is standing.
ADU standards
Setback, size, and parking rules for an accessory dwelling unit in Oregon City.
| Maximum size | 800 sq ft or 60 percent of the house, whichever is less (OCMC 17.20.010(D)(4)) |
|---|---|
| Basement conversion | Exempt from the size limit when no new floor area is added (OCMC 17.20.010(D)(4)) |
| Placement, detached | Behind the house's front building line, or 40 ft from the front lot line, whichever is less restrictive (OCMC 17.20.010(D)(2)) |
| Height, detached | The greater of the house's height or 20 ft (OCMC 17.20.010(D)(3)) |
| How many | One per detached single family dwelling (OCMC 17.20.010(C)) |
| Exterior | Finish materials, window trim of at least 2 inches, and eave projection must be similar to the house (OCMC 17.20.010(D)(6)) |
| Parking | None required (OCMC 17.20.010(D)(7)) |
| Review | Type I minor site plan and design review, run alongside the building permit (OCMC 17.20.010(E)) |
Oregon City is the only city in our Oregon coverage that requires a land use approval alongside the building permit. It is a Type I minor site plan and design review, run concurrently, and the city puts it at roughly two weeks (OCMC 17.20.010(E)). Worth building into the schedule rather than discovering at submittal.
The exterior standards are real. Finish materials have to be similar in type, size, and placement to the house, window trim has to match and be at least two inches wide, and eaves have to project the same distance (OCMC 17.20.010(D)(6)). That is more prescriptive than most Oregon cities and it affects the elevations from the start.
Short term rental is not a normal accessory dwelling use here. A stay under 30 days falls under the city's bed and breakfast and boarding house provisions, which require a Type III conditional use approval with a public hearing.
Planning office: Oregon City Planning
Sources: Oregon City Municipal Code 17.20.010. Ordinance 22-1001, effective June 2022. ORS 197A.425. Last checked August 2026.
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