Multifamily and Duplex Properties for Sale in Annapolis: Zoning and Rent Rules

What multifamily in Annapolis looks like

Annapolis is ranch, vineyard and timber country on the ridges east of The Sea Ranch, and it has no apartment buildings to speak of. Rental income comes from a main home with an accessory unit, farmworker or agricultural employee housing on working land, older second homes on large parcels, and occasional vacation rentals. The North Sonoma Coast Fire Protection District’s hazard plan counted fewer than 10 new developments in Annapolis in recent years, which gives a sense of how slowly the housing stock changes. For two to four units, read financing 2-4 unit properties; for larger buildings elsewhere, see apartment building loans.

Where the zoning allows it

Annapolis is not an Urban Service Area on the County’s GIS layer, and for rural land the County’s agricultural and resource zones under Article 06 are the ones to know. Multifamily dwellings are not listed in any of them.

The density figure for a given parcel is set by the general plan map within each range. We did not map Annapolis parcels; check each one.

ADUs and farmworker housing. ADUs are permitted in every zone above. Farmworker and agricultural employee housing are permitted in the four farm and resource zones, which can make a working vineyard’s housing more valuable than its acreage suggests. Confirm that any existing farmworker units hold the right permits and are rented to qualifying workers. See our ADU investment guide.

SB 9. SB 9 applies only in single-family residential zones and excludes prime farmland and very high fire hazard severity zones without state mitigation, so it rarely helps on Annapolis farm and timber land. See our SB 9 lot split guide.

Coastal parcels. If part of a parcel lies inside the Coastal Zone, Chapter 26C applies; coastal ADUs are called second dwelling units and junior ADUs are not yet provided for there, per Permit Sonoma.

Rent rules: state law only

Rent cap. The Attorney General’s rent cap page, updated July 16, 2026, does not name Sonoma County in a regional group, so covered units fall under All Other Counties: up to 8.6% for increases from August 1, 2026 through July 31, 2027. The AG’s local ordinance chart lists no Sonoma County jurisdiction.

Coverage. Many Annapolis rentals are houses owned by individuals, which may be exempt if the lease gives the required notice. Employer-provided farmworker housing has its own state rules, separate from AB 1482; have counsel review any employee tenancy. See our AB 1482 guide and just cause eviction guide.

Annapolis rental property rules

• Vacation rentals. Sonoma County requires an annual license for every vacation rental. Its April 2023 action limits licenses to individuals and family trusts, one per person, caps occupancy at 12 or the septic capacity, and requires written evacuation plans and defensible space.
• Fire-driven caps. Article 79 lists significant fire hazard and inadequate road access among the reasons the County may cap or bar vacation rentals. Annapolis was not on the 2023 District 5 list, but those criteria are worth watching here.
• Agricultural farmstays. On farm and resource land, farmstays are a permitted agricultural use, distinct from vacation rentals.
• Transfer tax. The County Recorder charges $0.55 per $500, less assumed loans; no city tax applies.

Fire, access, water and buildings

Fire service. The North Sonoma Coast Fire Protection District, formed April 1, 2016, replaced the Annapolis Volunteer Fire Department, the Sea Ranch department and CAL FIRE service. It lists apparatus buildings at Annapolis Station No. 1 and No. 2.

Wildfire. The district’s plan ranks wildfire as its top hazard, says new Annapolis homes and agricultural properties are all in high wildfire risk areas, and lists a community wildfire protection plan for Annapolis as a planned action. Horicon School is the area’s evacuation zone and air medical landing site. Insurance availability and cost can decide whether a rental pencils.

Road access. The same plan describes Annapolis Road as a primary fire response route with repeated landslides and dead trees on unstable banks.

Water and septic. Expect wells, springs or ponds and septic. Have each tested and, for any building with three or more units and elevated decks, budget SB 721 balcony inspections; older wood-frame homes may need seismic retrofit review.

Underwriting an Annapolis multifamily purchase

1. Confirm the zoning district, general plan density and which dwellings hold permits.
2. Separate farmworker housing from ordinary rentals and review the rules for each.
3. Test wells and septic for every occupied unit.
4. Get fire insurance quotes and a defensible-space review early.
5. Collect leases, the rent roll and estoppel certificates.
6. Rebuild expenses with reassessed taxes, road upkeep and insurance in our rental property analysis.

Questions people ask

Sources & notes

1. Sonoma County 2021 Hazard Mitigation Plan, North Sonoma Coast FPD Annex
2. Chapter 26, Article 06, Agricultural and Resource Zones
3. Chapter 26, Article 08, Residential Zones
4. Sonoma County GIS, Urban Service Areas
5. Permit Sonoma, Coastal Zone ADUs
6. Chapter 26, Article 79 and April 2023 vacation rental action
7. Sonoma County Recorder, Documentary Transfer Tax
8. California Attorney General, rent caps

Note: Annapolis-specific facts come mainly from the 2021 hazard mitigation plan annex and reflect conditions then. We did not map parcel zoning, confirm Coastal Zone status or check fire hazard severity zones. The SB 9 exclusions and farmworker housing law are summaries of state law. For countywide context, see our Sonoma County multifamily guide and Sonoma County commercial guide.

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

Related: Annapolis real estate guide · Commercial real estate in Annapolis · Multifamily investing guide · Investor services