5 county-level rules, plus city-specific rules for 1 city in Lane County, Oregon.
Verified from official government sources
Rural Residential (RR) lots of at least 2 acres may add one accessory dwelling unit, capped at 900 sq ft of usable floor area and located within 100 feet of the existing single-family dwelling (Lane Code 16.290, Ordinance 23-05).
Lane Code 16.290(8)(c)(xi)(aa)-(bb)
The ADU will be located no farther than 100 feet from the existing single-family dwelling... The ADU will not include more than 900 square feet of usable floor area.
In the Rural Residential zone, accessory structures must sit at least 20 feet from a State, County, or public-road right-of-way and 10 feet from other property lines. Small buildings under 120 sq ft may encroach into the 10-foot setback (Lane Code 16.290(7)).
Lane Code 16.290(7)(a)
Structures other than a fence or sign shall be located: At least 20 feet from the right-of-way of a State road, County road or a local access public road... At least 10 feet from all other property lines.
Turning a garage into living space is a change of use that requires a Lane County building permit and must meet Oregon Residential Specialty Code plus zoning rules. In the RR zone a converted unit may qualify as the parcel's one allowed ADU under Lane Code 16.290.
A carport is a structure under Lane Code 16.290(7), so it must meet the same setbacks as other buildings: 20 feet from a road right-of-way and 10 feet from other property lines. Larger carports require a building permit for the county to verify anchoring and setbacks.
Lane Code 16.290(7)(a)
Structures other than a fence or sign shall be located: At least 20 feet from the right-of-way of a State road, County road or a local access public road specified in LC Chapter 15; At least 10 feet from all other property lines.
A tiny house on a permanent foundation is treated as a dwelling or ADU under Lane Code 16.290 and must meet building code plus the 900 sq ft ADU cap. In the RR zone, one recreational vehicle used for residential purposes is allowed under a rental agreement per LC 16.290(9).
Lane Code 16.290(2)(w)
Not more than one (1) recreational vehicle used for residential purposes on a lot or parcel that is subject to a residential rental agreement and meets the standards of LC 16.290(9).
1 cities in Lane County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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