Multifamily and Duplex Properties for Sale at Lake Berryessa: Zoning and Rent Rules

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What multifamily at Lake Berryessa looks like

The private communities near Lake Berryessa, including Berryessa Highlands, Berryessa Estates and Spanish Flat, are mostly single-family subdivisions and rural lots in unincorporated Napa County. Income property usually means a house with an ADU or JADU, a duplex where zoning allows, or a share of the small number of Housing Element sites the County has set aside for apartments at Spanish Flat. Because the shoreline is federal land, there is no private lakefront to build on, and small water and sewer districts set the real limit on new units. For financing, see financing 2-4 unit properties and apartment building loans.

Where the zoning allows it

Napa County’s Title 18 applies throughout the Berryessa area.

District or site	What it allows	Key limits
AH combining district, Spanish Flat Sites A–F (2009)	Single-family and multifamily by ministerial building permit	Up to 25 units/acre, 110 units combined. Ownership units affordable to moderate income for 40 years
AH, Spanish Flat 2023 site (APN 019-261-040 and part of 019-261-041)	Residential at a set density range	20 to 25 units/acre. 20% of units for low-income households for 40 years
RM Residential Multiple, where mapped	Multifamily and SRO units without a use permit	20 to 25 units/acre. 20% lower-income set-aside
Residential single and country districts	One home plus ADU and JADU	County ADU rules and covenant
AW Agricultural Watershed	One home, ADUs, a guest cottage, small farmworker housing	Large minimum lots
MC Marine Commercial	A deed-restricted commercial ADU by use permit	Moderate-income or lower occupants

Spanish Flat AH sites. Chapter 18.82 lists six 2009-era Spanish Flat parcels by assessor number (019-261-038, -035, -026, -025, 019-262-001 and 019-050-003), plus the 2023 site. Its history:

Ordinances. Ordinance 1321 (June 23, 2009) created it; Ordinances 1491 (June 4, 2024) and 1495 (September 24, 2024) last amended it.
Ministerial approval. Projects that meet the chapter’s affordability, density, design and mitigation rules need only a building permit, reviewed ministerially without CEQA review, though subdivisions still go through the Subdivision Map Act.
Multifamily standards. Buildings of three or more units need a 0.9-acre site, 40% maximum coverage and 35-foot height. Parking is 1 space per studio, 1.25 per larger unit and 0.25 guest spaces per unit.
Two units. Projects of two or fewer units on a lot need 3,500 square feet and two parking spaces plus one per second unit.
Mitigation. The 2009 sites carry measures from the April 22, 2009 EIR, and the 2023 site carries measures from the January 24, 2023 EIR.
Use it or lose it. If construction does not start within a year of permit, reserved units return to the pool.
One set of rules. Owners use AH standards or base zoning, not both.

The County announced state certification of its Housing Element on July 12, 2024, reporting the Spanish Flat rezoning complete.

ADUs. The County’s ADU page allows ADUs up to 1,200 square feet and JADUs up to 500, and it warns that inadequate water, groundwater overuse or failing septic can sink a permit. See our ADU investment guide.

SB 9. SB 9 reaches only single-family lots in urbanized areas or urban clusters, so many Berryessa parcels, and all agricultural land, may not qualify. Confirm with the County. See our SB 9 lot split guide.

Rent rules: state law only

Rent caps. The Attorney General’s rent cap page, updated July 16, 2026, places Napa County in All Other Counties. Covered units may rise up to 7.7% for increases from August 1, 2025, and 8.6% from August 1, 2026 through July 31, 2027. No Napa County jurisdiction appears on the AG’s chart of local rent ordinances. See our AB 1482 guide and just cause eviction guide.

Restricted units. Units on the Spanish Flat sites, or under the RM set-aside, carry recorded affordability covenants that override market pricing for their term.

Lake Berryessa rental property rules

No short-term rentals. County Code Section 18.104.410 bars transient commercial occupancy of dwellings in every residential and agricultural district. A lake-area cabin cannot be underwritten as a vacation rental.
ADU covenant. The County requires a recorded covenant that neither the ADU nor the main home will be rented for under 30 days before the ADU permit issues.
Camping is not housing. County Chapter 12.08 limits overnight camping on the federal lake lands, including sleeping in vehicles or on boats, to Reclamation-designated areas.
Transfer tax. The County’s document transfer tax is $0.55 per $500, customarily paid by the seller, with no city tax.

Water, sewer and fire recovery

Napa LAFCO’s 2021 sphere of influence report lays out the constraints:

Berryessa Estates. The Lake Berryessa Resort Improvement District provides water and sewer within a sphere of about 217 acres. Eight units on outlying jurisdictional land use septic and wells. The report notes fiscal distress and aging pipes.
Berryessa Highlands. The Napa Berryessa Resort Improvement District’s sphere includes the 10-lot Oakridge Estates subdivision. About 110 homes in its boundary burned in the 2020 Lightning Complex fires. Its treatment plant sits on two district parcels that staff proposed adding to the sphere.
Spanish Flat. The Spanish Flat Water District lost most of its utility systems there in the 2020 fires.

New units on the AH sites cannot get permits without proof of sewer and water, usually a will-serve letter. For rebuilt or older buildings, ask for permits and final inspections. Buildings of three or more units with elevated decks need SB 721 balcony inspections, and older wood-frame buildings merit a seismic retrofit review. Get a wildfire insurance quote early.

Underwriting a Lake Berryessa multi-unit purchase

Confirm the zoning, and whether the parcel is one of the named Spanish Flat AH sites.
Identify the water and sewer provider and get capacity in writing, or test the well and septic.
Count only permitted units and read any ADU or affordability covenant.
Underwrite long-term rents only, and model covered increases at or below 8.6%.
Collect leases, the rent roll and estoppel certificates.
Rebuild expenses with reassessed taxes, district charges and fire insurance in our rental property analysis.

Questions people ask

Where can apartments be built near Lake Berryessa?

Mainly on the Spanish Flat sites named in County Chapter 18.82, and on any RM-zoned land.

Do the Spanish Flat sites need a public hearing?

Not if the project meets the chapter’s standards. Approval is a ministerial building permit.

Can I rent my lake cabin on Airbnb?

No. The County bars transient occupancy of dwellings in residential and agricultural districts.

Is there rent control at Lake Berryessa?

No local ordinance applies. Covered units follow AB 1482.

How big can an ADU be?

Up to 1,200 square feet under the County’s ADU page, with JADUs up to 500, if water and septic allow.

Why does the water district matter so much?

Small resort districts serve these communities, and the 2020 fires damaged their systems. New units need proof of service.

Sources & notes

Note: RM, AW, ADU covenant and Housing Element details come from County sources reviewed for our Napa County page; we did not confirm which parcels near the lake are mapped RM. Utility conditions are as of 2021.

General information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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Matthew Martinez

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