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Cascadia: middle housing, ADU parking exemptions and RV rules will be updated to match state law

Woodburn Planning Commission · July 27, 2026
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Summary

Consultants told the commission the WDO must be updated on middle housing definitions, ADU parking exemptions, density bonuses for affordable units, and standards allowing manufactured housing and RVs in specific contexts (RV occupancy requires permanent sewer/water hookups).

Cascadia said Woodburn largely met earlier middle-housing updates but must alter definitions so duplexes, triplexes and quadplexes may be attached or detached; the city will also need to add a density bonus for projects that include accessible or affordable units and create a procedure for middle-housing land divisions. The consultants added that accessory dwelling units must explicitly be exempt from requiring additional off-street parking.

On manufactured housing and RVs, consultants recommended removing standards that apply only to manufactured homes and eliminating age restrictions for manufactured units. They noted RVs may be permanently occupied in manufactured-dwelling parks but would require permanent sewer and water hookups; "It does require that the RVs have a permanent sewer and water hookup in order to be a permanent dwelling," Mary said.

Consultants also recommended permitting single-room occupancy (SRO) units in all zones that allow residential use, and removing occupancy restrictions based on familial relationships in definitions (e.g., changing "single-family dwelling" to "single-unit dwelling").