Washington County, OR Parking Rules: Driveway Rules (2026)

Section 413-4 sets the physical standards every off-street parking and driveway surface must meet, and two of its subsections speak directly to residential driveways. 5 requires that, with narrow exceptions, off-street parking areas be constructed with curbs of concrete or asphalt, and states plainly that driveways for detached dwelling units that are less than 100 feet in length shall be paved and that all driveways for Townhouse dwelling units shall be paved without exception for length. Detached or two-unit attached dwellings on a single lot, and any parking area outside the Urban Growth Boundary (UGB), are exempted from the curbing requirement, and gravel-surfaced areas may use wood or other Review Authority-approved curb materials instead of concrete or asphalt.

11 sets the minimum width: the minimum driveway width for each single-family attached or detached dwelling unit with individual vehicular access to a street shall be 10 feet, with driveway depth tied to whatever setback the primary zoning district requires to the garage vehicle entrance. The same section allows a driveway to double as a counted parking space: within a driveway, each 10-foot wide area meeting the minimum driveway depth may be counted as one off-street parking space. 12 lets two adjoining lots, each with a Townhouse or detached dwelling, share a combined driveway if the combined width is at least 20 feet and each lot's portion measures a continuous minimum of 10 feet. 3 substitutes a gravel standard, four inches of base rock topped with two inches of three-quarter-inch minus leveling course, in place of full paving.