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State ADU guidance prompts county updates; up to three ADUs allowed by state

Siskiyou County Planning Commission · June 3, 2026
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Summary

Presenters noted recent state guidance allows up to three accessory dwelling units on single-family parcels (attached, detached, junior ADU); staff cautioned that utility, sanitation and cost constraints make broad local uptake uncertain.

S5/Presenter summarized recent state ADU guidance incorporated into the draft zoning: single-family homes can potentially have up to three accessory dwelling units (one attached, one detached and a junior ADU), subject to compliance with health, sanitation and county standards. "From a single family perspective...the state is clarified that a single family home can have actually up to 3 accessory dwelling units," S5/Presenter said.

Presenters and commissioners noted the practical barriers: high construction costs and utility/septic capacity in rural Siskiyou County make full utilization unlikely for most property owners. S8/Presenter added that HCD reviews adopted ADU ordinances and that past state drafts had proposed two ADUs; the new change to three expands allowances but remains constrained by site conditions.

Staff said they updated development standards and clarified cross-references with the housing element and HCD guidance to remain compliant. Commissioners requested attention to wildfire-safety and septic/sewer limits as part of implementation.