5 rules for unincorporated Clackamas County, Oregon.
Verified from official government sources
In unincorporated Clackamas County, ZDO Section 839 allows one ADU per single-family dwelling. Inside an urban growth boundary the ADU maxes at 900 sq ft (500 sq ft in R-2.5). Oregon HB 2001 mandates ADUs statewide. Cities set their own rules.
Clackamas County ZDO 839.01
Only one accessory dwelling unit shall be allowed per detached single-family dwelling or manufactured dwelling. The maximum floor area of an accessory dwelling unit shall be: 500 square feet in the R-2.5 District; and 900 square feet in all other zoning districts.
In unincorporated Clackamas County, ZDO Section 315 sets accessory-building setbacks. A shed behind the building line under 100 sq ft and 8 feet tall needs no setback; larger sheds need 3-5 ft side/rear setbacks. Sheds over 200 sq ft need a building permit.
Clackamas County ZDO Section 315, note 11
If an accessory building is located behind the building line of the main building, the applicable minimum rear and side setback standards for that accessory building are based on the accessory building area and accessory building height... 100 square feet or less, 8 feet or less: None.
Clackamas County has no separate 'garage conversion' ordinance. Converting a garage into living space is treated as either added dwelling area or an ADU under ZDO Section 839, needs building permits, and must keep required off-street parking. Cities set their own rules.
Carports are listed as a customarily permitted accessory structure in Clackamas County's ZDO and follow the same dimensional standards as other accessory buildings. Vehicle entries face a 20-foot front setback, and side/rear setbacks match Section 315. A building permit is generally required.
Clackamas County ZDO Section 315
Minimum Front Setback: 15 feet, except 20 feet to garage and carport motor vehicle entries.
A tiny home on a foundation is treated as a dwelling or ADU under Clackamas County's ZDO (Section 839 for ADUs). A tiny house on wheels is an RV and cannot be permanent housing except where ZDO Section 846 allows an RV as a second dwelling. Oregon adopted a tiny-home
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