Accessory Structures in Pasco, WA (2026)
5 verified accessory structures rules for Pasco, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Pasco allows one attached or one detached ADU per residential parcel with a conforming single-family home (not in the RP zone). The ADU may be up to 1,000 sq ft or 55% of the main house, whichever is less, and up to 25 ft tall. No extra parking is required, but occupants must live in the ADU more than 180 days per year.
Pasco Accessory Dwelling Unit (ADU) Rules
Some RestrictionsShed Rules
In Pasco, detached storage buildings such as sheds are a permitted residential accessory use, limited cumulatively to 200 square feet of gross floor area and 15 feet in height, with no container (shipping-container) storage allowed. A habitable structure and a non-habitable structure such as a shed must be at least 6 feet apart.
Pasco Shed Rules
Some RestrictionsGarage Conversions
Converting a garage into living space in Pasco generally creates an accessory dwelling unit (ADU). Pasco's ADU Guide lists a garage conversion (attached or detached) as a recognized ADU type. The resulting unit is capped at 1,000 sq ft or 55% of the main house, whichever is less, and requires building permits.
Pasco Garage Conversion Rules
Some RestrictionsCarport Rules
Pasco has no carport-specific ordinance; carports are governed as residential accessory structures under the zoning code. Detached accessory structures must meet the zoning district's setbacks, and a non-habitable structure must be at least 6 feet from a habitable one. A building permit is generally required.
Pasco Carport Rules
Some RestrictionsTiny Homes
Pasco has no separate tiny-home ordinance. A permanent tiny house on a foundation is treated as an ADU, capped at 1,000 sq ft or 55% of the main house, whichever is less. A tiny home on wheels (titled as a motor vehicle) and RVs/motorhomes are not recognized as ADUs and cannot serve as permanent dwellings.