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

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What multifamily in Canyon looks like

Canyon is a small unincorporated enclave of homes in a redwood canyon off Pinehurst Road, between Moraga and the Oakland hills. A 2026 county project notice on CEQAnet calls it a tiny unincorporated community. There are no apartment buildings. Rental housing means single-family homes, cabins, and homes with a second unit, ADU or junior ADU. For an investor, the realistic plays are a house with an existing permitted second unit, or adding an ADU where the site can support it. Two-to-four-unit loan programs can still apply to a home with ADUs. See financing 2-4 unit properties and apartment building loans.

Where the zoning allows it

Contra Costa County zones Canyon under Division 84. We did not confirm which districts are mapped there, so read the county map for the parcel. Districts typical of the county’s rural and wooded areas allow these residential uses:

District	Units allowed	Notes
Large-lot single-family (R-20 to R-100)	One home, plus an ADU and junior ADU under Chapter 82-24	SB 9 two-unit projects only where state criteria are met
F-R Forestry Recreation	Uses allowed in single-family and agricultural districts, plus summer homes and residences	½ acre and 80 ft average width for a home. 50 ft or four stories. 25 ft setback from public roads
A-2 General Agricultural	One home, an ADU and JADU, and farmworker dwellings by right. A second single-family home by land use permit	Agricultural rules
Duplex or multifamily districts	Not confirmed in Canyon	County D-1 and M districts exist elsewhere

ADUs. County zoning allows ADUs on residential and agricultural lots under Chapter 82-24. In Canyon the binding limits are fire safety, access, slope, creek setbacks and septic. See our ADU investment guide.

SB 9. State law limits SB 9 in Very High Fire Hazard Severity Zones unless fire mitigation standards are met. It also limits it outside urbanized areas. The Moraga-Orinda Fire District says parts of its service area are in state Very High Fire Hazard Severity Zones, so check the hazard map and SB 9 eligibility for each parcel. See our SB 9 lot split guide.

Rent rules: state law only

The Attorney General’s rent cap page lists no local cap for unincorporated Contra Costa County. Covered Canyon rentals follow the Tenant Protection Act. Contra Costa is in the AG’s San Francisco Area region, where the cap is 6.3% for increases starting August 1, 2025 and 8.8% for increases from August 1, 2026 through July 31, 2027. A single-family home owned by an individual can be exempt with the required lease notice. An owner who lives on site and rents an ADU may also fall outside the cap, depending on the configuration. See our AB 1482 guide and just cause eviction guide.

Canyon rental property rules

No local registry or inspection program. Unincorporated Canyon has no local rent registry or rental inspection program that we found. State habitability law and county code enforcement apply.
Permits for existing units. Older canyon cabins and second units were often built without permits. Before you count rent from a unit, confirm it was permitted or can be legalized under current ADU rules.
Short stays. We did not verify county short-term rental rules. Confirm them with the county.
Cannabis. Canyon is not one of the nine areas in the county’s cannabis exclusion district, but personal and commercial cannabis rules under county code and state law still apply.

Fire, access, creeks, septic and water

These decide whether a Canyon property can take another unit:

Fire. MOFD, formed in 1997, covers about 42 square miles and names Canyon in its service area. Expect requirements for fire access, water supply, defensible space and ignition-resistant construction for any new unit.
Access and creeks. Pinehurst Road is narrow, and some homes depend on a single driveway over a creek. The 2026 county notice concerned replacing a failing 72-inch culvert under the only driveway to a home at 50 Pinehurst Road with a 12-foot bottomless arch culvert. That needed a county drainage permit, creek-slope rock armoring and temporary water diversion. Budget for that kind of work when inspecting a property.
Water. We could not confirm a public water provider for Canyon from official sources. Contra Costa LAFCO’s EBMUD profile lists nearby Moraga but not Canyon. Confirm the source, whether public, a well or a spring, and its capacity.
Septic. Assume septic until confirmed otherwise. An ADU usually needs a septic evaluation and may need a larger system.
Structures. Wood homes on slopes need geotechnical and seismic review. Elevated decks on a building with three or more units trigger SB 721 inspections.

Underwriting a Canyon multifamily purchase

Get the county zoning for the parcel and confirm every dwelling’s permit history.
Check the fire hazard severity zone and ask MOFD about access and water flow for an ADU.
Identify the water source and get septic capacity confirmed by a qualified inspector.
Inspect driveways, culverts and creek banks, and price any repair that needs a drainage permit.
Collect leases and estoppel certificates, and confirm AB 1482 status and notices.
Add insurance (often a major cost in fire zones), reassessed property tax and the county transfer tax of $0.55 per $500 (Clerk-Recorder) in our rental property analysis.

Questions people ask

Are there apartment buildings in Canyon?

No. Canyon’s housing is single-family homes, cabins and second units in an unincorporated canyon.

Does Canyon have rent control?

No local rent control. Covered units follow AB 1482, 8.8% for increases from August 1, 2026.

Can I add an ADU in Canyon?

County zoning generally allows ADUs, but fire access, water, septic, slope and creek setbacks will decide whether one is feasible.

Who provides fire service in Canyon?

The Moraga-Orinda Fire District, which names Canyon in its service area.

Does SB 9 apply in Canyon?

Possibly, but state law limits it in Very High Fire Hazard Severity Zones and outside urbanized areas. Check each parcel.

Who regulates building in Canyon?

Contra Costa County’s Department of Conservation and Development, with drainage permits from county Public Works for creek work.

Canyon’s adopted planning priorities

The 2045 Contra Costa General Plan, Canyon guidance calls for parcel-specific access review, habitat protection and development compatible with the community’s unusual topography and historical building pattern. Its actions include drainage work along Pinehurst Road, emergency turnarounds along Pinehurst and Canyon Roads, and possible zoning changes. These are adopted planning directions, not evidence that a rezone or road improvement has been completed. Compare today’s parcel map and permit file with those directions before treating a proposed business or additional dwelling as feasible.

Sources & notes

Note: The zoning districts mapped in Canyon, its water and sewer providers, and parcel fire hazard zones were not confirmed from official sources.

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

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