Solano County, CA Accessory Structures: ADU Rental Restrictions (2026)
Key Facts
- Minimum Term
- 30 days when ADU and JADU share a lot
- Governing Section
- Solano County Code § 28.72.10(B)(2)(p)(4)
- ADU Size Cap
- 800 sq ft when paired with a JADU
- JADU Footprint
- Existing home footprint plus 150 sq ft
- Separate Rule
- JADUs alone also barred from short-term rental
Summary
When a Solano County lot carries both an accessory dwelling unit and a junior accessory dwelling unit, Section 28.72.10(B)(2)(p)(4) bars renting either unit for less than 30 days, closing off short-term or vacation-rental use of that combined pair even though a standalone ADU faces no such floor.
p. Accessory Dwelling Unit and Junior Accessory Dwelling Unit on Same Lot. An accessory dwelling unit and a junior accessory dwelling unit are not allowed on the same lot unless all of the following requirements are met:
(1) The accessory dwelling unit is detached from the primary dwelling and complies with all applicable development standards.
(2) The accessory dwelling unit does not exceed 800 square feet gross floor area.
(3) The junior accessory dwelling unit is entirely within the existing space of an existing single-family dwelling, or entirely within the proposed space of a proposed single-family dwelling; provided, that an existing single-family dwelling may be expanded by not more than 150 square feet for the sole purpose of accommodating ingress and egress for the junior accessory dwelling unit.
(4) When a lot is developed with both an accessory dwelling unit and a junior accessory dwelling unit, neither unit may be rented for a term of 30 days or less.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 1868, passed April 9, 2026).
Full Breakdown
Solano's zoning code allows an ADU and a JADU on the same lot only if four conditions in subsection (p) are all met. The accessory dwelling unit must be detached from the primary dwelling, hold no more than 800 square feet of gross floor area, and comply with every other applicable development standard; the junior accessory dwelling unit must sit entirely inside the existing or proposed footprint of the single-family home, with an allowance to expand that home by up to 150 square feet solely to add ingress and egress for the JADU.
The fourth condition, subsection (p)(4), is the rental restriction: neither the ADU nor the JADU on that lot may be rented for a term of 30 days or less once both units exist together. That 30-day floor mirrors, but is legally separate from, the standalone minimum-term rule in subsection (q)(4) that already bars any junior accessory dwelling unit from short-term rental on its own. The combined effect is that Solano County does not allow either half of an ADU/JADU pair to be marketed as a vacation rental or booked through short-term platforms; occupancy must run at least a full month.
A single, stand-alone ADU without a companion JADU is not subject to (p)(4), but subsection (i) still bars selling or otherwise conveying it separate from the primary dwelling, so the unit stays tied to the parcel even when it can be rented.
Violations & Fines
Renting an ADU or JADU on a combined-unit lot for stays under 30 days violates Section 28.72.10(B)(2)(p)(4) and can trigger code enforcement through the Department of Resource Management, including a notice to cure and the county's administrative penalty process under Chapter 10; a JADU rented short-term also independently violates the standalone minimum-term rule in subsection (q)(4).
Frequently Asked Questions
Can I rent out my ADU as a short-term rental in Solano County?
Does the same rule apply to junior accessory dwelling units by themselves?
What size can the ADU be if I also build a JADU?
Sources & Official References
Other rules in Solano County
California rules heatmap·Compare Solano County to another location·View the California accessory structures overview
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