114 local rules on file · Pop. 29,581 · Alameda County
Showing ordinances that apply to San Lorenzo, CA
San Lorenzo is an unincorporated community with a population of approximately 29,581 in Alameda County, California. Because San Lorenzo is not an incorporated city, it does not have its own municipal government or city code. Instead, Alameda County ordinances apply directly to residential and commercial properties here. The rules below are the county-level regulations that govern your area. Nearby incorporated cities in Alameda County may have different rules.
Home occupations in unincorporated Alameda County must not generate traffic, parking demand, or deliveries beyond what is normal for a residence, limiting client visits to a small number per day.
Unincorporated Alameda County allows home occupations in residential zones as accessory uses, subject to the county zoning ordinance limits on scale, appearance, and off-site impacts under Title 17.
These unincorporated areas are also governed by Alameda County ordinances.
Cottage Food Operations are governed by state law (AB 1616 as amended by AB 1240) and registered or permitted through Alameda County Environmental Health; Class A registers, Class B is permitted and inspected.
Cattle, horses, goats, sheep, and swine are permitted on Alameda County Agricultural (A) and Rural Agricultural (RA) zoned parcels with minimum acreage requirements. Livestock are generally prohibited on R-1 lots.
Alameda County unincorporated areas generally allow chickens on residential parcels with setback requirements. Roosters and larger livestock are limited to agricultural zones. Minimum lot sizes apply for multiple animals.
Alameda County prohibits the intentional feeding of deer, coyotes, raccoons, skunks, bears, and other wildlife. Violations are a public nuisance and can trigger fines. Songbird feeders are generally allowed.
Alameda County requires dogs to be leashed in all public places including streets, sidewalks, and parks, except in designated off-leash areas. Leash length is limited and owners must maintain control at all times.
Alameda County does not impose breed-specific bans. California Food and Agricultural Code 31683 preempts local breed discrimination in licensing and ownership, though mandatory spay/neuter for specific breeds is permitted.
Beekeeping is permitted in most Alameda County zones with setback and hive-count limits. Keepers must register with the County Agricultural Commissioner under CA Food and Agricultural Code 29040.
Recreational fires in Alameda County are regulated by BAAQMD Regulation 6 Rule 3 (wood-burning) and fire code Section 307. Fire pits must use clean seasoned wood or natural gas/propane, be 25 feet from structures, and are prohibited during Spare the Air alerts.
Outdoor open burning is essentially prohibited in Alameda County under BAAQMD Regulation 5 Rules 3 and 6. Agricultural and prescribed burns require district permits and are limited to designated burn days. Residential yard waste burning is not allowed.
Much of east Alameda County including the Oakland Hills, Castro Valley, and Sunol foothills is designated Very High Fire Hazard Severity Zone by CAL FIRE, triggering strict defensible space rules.
Public Resources Code 4291 requires 100 feet of defensible space around all structures in VHFHSZ and SRA areas of Alameda County, enforced by CAL FIRE and the Alameda County Fire Department.
California Health and Safety Code 13113.7 requires smoke alarms in every bedroom, outside each sleeping area, and on every level of all dwellings in Alameda County. Alarms over 10 years old must be replaced, and new installations must be 10-year sealed lithium battery units or hardwired with battery backup.
All fireworks - including 'safe and sane' types - are prohibited in unincorporated Alameda County. Only three cities (Dublin, Newark, Union City) permit safe and sane fireworks during a limited window. Possession of dangerous fireworks is a misdemeanor under California Health & Safety Code §12700, with state fines starting at $1,000 and reaching $100,000 for large quantities.
Fire pits allowed per California Fire Code with proper clearance. Prohibited on BAAQMD Spare the Air days if wood/solid fuel. Gas fire pits permitted.
Alameda County requires weeds and grass to be kept below 12 inches in urbanized areas, with stricter 4-inch limits in Very High Fire Hazard Severity Zones under PRC 4291 defensible space rules.
Rainwater harvesting is legal and encouraged in Alameda County under CA Rainwater Capture Act of 2012 (AB 1750). Rain barrels under 5,000 gallons for landscape irrigation generally need no permit.
East Bay Municipal Utility District (EBMUD) and Alameda County Water District (ACWD) enforce permanent water waste rules plus drought-stage restrictions. AB 1572 bans potable water on non-functional turf starting 2027.
The Alameda County Weed Abatement Program run by the Fire Department requires property owners to remove weeds and combustible debris annually, with violations resulting in abatement and tax liens.
Alameda County requires trimming of trees that obstruct public rights-of-way, block street-sign visibility, or interfere with utility lines. Protected heritage and native oak trees may require a permit before trimming.
Alameda County regulates removal of protected trees including heritage oaks, trees over specified diameters, and trees in designated natural resource areas. Permits are often required before removal on private property.
Native and drought-tolerant plants are encouraged throughout Alameda County. State MWELO requires climate-appropriate plants for new landscapes, and EBMUD/ACWD offer rebates for lawn-to-native conversions.
Artificial turf is permitted in Alameda County as a water-saving lawn alternative. State AB 1572 restricts potable irrigation of non-functional natural turf starting 2027, boosting turf adoption.
Retaining walls over 4 feet in height (measured from bottom of footing to top) require a building permit and engineered plans in unincorporated Alameda County under the California Building Code.
Alameda County requires a building permit for fences over 7 feet tall in unincorporated areas. Fences under 7 feet generally do not need a permit but must comply with zoning height and setback limits.
Under California Civil Code 841 (Good Neighbor Fence Act), adjoining landowners in Alameda County share equal responsibility for reasonable costs of shared boundary fences unless one party shows the cost would be unjust.
Alameda County Zoning Ordinance generally limits residential front yard fences to 3-4 feet and side or rear yard fences to 6-7 feet, with clear-vision triangles required at driveways and intersections.
CA Health and Safety Code 115920 requires pool enclosures at least 60 inches (5 feet) tall with self-closing, self-latching gates around residential pools and spas in Alameda County.
Alameda County prohibits barbed wire, razor wire, and electrified fences in residential zones. Chain link may be restricted in front yards in some areas, and hazardous materials are banned countywide.
Alameda County Zoning Code §17.52.430 limits fences to 4 feet in required front yards and 6 feet in side and rear yards. A 2-foot limit applies within 30 feet of street intersections for sight visibility.
Alameda County unincorporated areas require driveways to be paved, maintain clear sight lines, and not block sidewalks or public right-of-way. Encroachment permits needed for new driveway approaches.
Alameda County unincorporated areas generally allow overnight street parking but prohibit storing vehicles in one spot over 72 hours per CVC 22651(k). Oversized vehicles and RVs face stricter limits.
Alameda County enforces CVC 22651(k) allowing removal of vehicles parked 72+ hours. Abandoned vehicles on private property and public streets can be reported to the Sheriff for abatement.
Alameda County supports residential EV charging installations through streamlined permits per AB 1236. HOAs cannot prohibit EV chargers on owner-controlled parking per Civil Code 4745.
Unincorporated Alameda County regulates RV parking through zoning ordinance. 72-hour street limit applies. Specific requirements vary by PD and zoning district.
Short-term rentals in unincorporated Alameda County must comply with the countywide noise ordinance and general nuisance rules; amplified sound and outdoor gatherings are restricted during nighttime hours.
Unincorporated Alameda County does not set an STR-specific occupancy cap but enforces building code, fire code, and nuisance rules that effectively limit total guests based on bedrooms and egress.
Unincorporated Alameda County imposes a Transient Occupancy Tax on short-term lodging of 30 days or fewer; combined TOT rates in Alameda County cities typically range from about 10 to 14 percent.
Alameda County does not mandate a specific STR insurance policy, but standard homeowner policies usually exclude commercial hosting, making dedicated STR coverage or platform liability coverage essential.
STRs in unincorporated Alameda County must provide on-site parking consistent with the residential zoning standard and should limit guest vehicles to the number of on-site spaces to avoid neighborhood impacts.
Unincorporated Alameda County does not currently impose a countywide annual night cap on short-term rentals, but individual cities and future county programs may limit un-hosted rentals to a set number of nights.
Unincorporated Alameda County requires rental housing registration under Chapter 6.64. STRs under 30 days prohibited in ADUs and JADUs. Business license required for any rental activity. Annual registration renewal required.
Amplified music in unincorporated Alameda County must not exceed noise ordinance decibel limits or be plainly audible beyond the property line during nighttime hours. A special event permit is required for amplified outdoor events.
Alameda County Noise Element sets tiered decibel limits by zoning and time of day: 60 dBA daytime and 50 dBA nighttime in residential areas, with higher limits in commercial and industrial zones.
Aircraft noise around Oakland International Airport is regulated under FAA Part 150 and preempts local control. Alameda County participates in the Port of Oakland noise abatement program and land-use compatibility planning under the Airport Land Use Commission.
Outdoor music in unincorporated Alameda County requires compliance with residential decibel limits and typically a temporary use or special event permit for amplified gatherings over a set attendance threshold.
Industrial and manufacturing noise in unincorporated Alameda County is regulated through zoning-based decibel limits, conditional use permits, and CEQA analysis. Stationary sources must not exceed 70 dBA at industrial property lines or intrude into adjacent residential zones.
Alameda County unincorporated areas allow leaf blowers during general construction/maintenance hours. California AB 1346 bans the sale of new gas-powered leaf blowers statewide as of 2024, though use of existing equipment is not prohibited.
Alameda County noise ordinance (Chapter 6.60) sets detailed dB limits by zone and time. Residential nighttime (10 PM–7 AM): 45 dBA for 30+ min/hr, up to 65 dBA max. Daytime (7 AM–10 PM): 50 dBA for 30+ min/hr, up to 70 dBA max. 5 dB penalty for tonal/speech/music noise.
Converting an attached or detached garage to an ADU in Alameda County is allowed ministerially under CA Gov Code 65852.2, with no replacement parking required for the ADU conversion.
Alameda County complies with California Government Code 65852.2 mandating ministerial ADU approval. ADUs up to 1,200 sqft for detached and JADUs up to 500 sqft are allowed on most residential lots.
Carports in Alameda County generally require a building permit and must meet residential setbacks. They may count toward lot coverage limits but are often allowed in setbacks with reduced requirements.
Unincorporated Alameda County treats a foundation tiny home as an Accessory Dwelling Unit under Title 17 Chapter 17.55 (Ordinance O-2024-32, Sept 2024). ADUs up to 1,200 sq ft are generally by-right under California Government Code Section 65852.2. A tiny house on wheels is classified by HCD as a recreational vehicle under ANSI A119.5 and is not a permanent dwelling.
Unincorporated Alameda County regulates sheds under Title 17 Section 17.52.260: a detached accessory building in any R district must be one story, no taller than 15 feet, and at least 6 feet from any other building on the lot. Title 15 adopts the California Residential Code; sheds 120 sq ft or less are generally permit-exempt under CRC R105.2.
Hot tubs and spas deeper than 18 inches require permits and follow the same California Pool Safety Act fencing or locking-cover rules as pools; smaller spas follow electrical permit requirements.
Swimming pools and spas in unincorporated Alameda County require building, plumbing, and electrical permits and must comply with the California Building Code and Swimming Pool Safety Act (H&S 115920).
Unincorporated Alameda County enforces the California Swimming Pool Safety Act (Health & Safety Code §§115920-115929). Pools deeper than 18 inches require an enclosure at least 60 inches high, with gates that self-close and self-latch at 60+ inches above grade. New or remodeled pools must have at least two of seven approved drowning prevention features.
Unincorporated Alameda County applies California's Swimming Pool Safety Act (HSC 115920-115929) through Title 15 Chapter 15.08, which adopts the California Building and Residential Codes (2022 CRC Appendix AX). New or remodeled residential pools must have at least two of seven approved drowning-prevention features; any isolation barrier must be at least 60 inches tall.
Alameda County elevators are regulated by Cal/OSHA Elevator Unit under Title 8 CCR 3000-3137. Annual inspections and permits are required, with enforcement by state inspectors.
Alameda County enforces California H&S Code 17920.10 treating deteriorated lead paint in pre-1978 housing as substandard. Oakland, Berkeley, and Alameda have old housing stocks with strict abatement rules.
Pest control in Alameda County is regulated by CA DPR and county Environmental Health. Landlords must provide pest-free housing under Civil Code 1941.1 and SB 655.
Scaffolding in Alameda County must comply with California Labor Code 7150-7157 and Cal/OSHA Title 8 CCR 1635-1670. Cal/OSHA permits required over 36 feet; encroachment permits for public right-of-way.
Unincorporated Alameda County limits maximum lot coverage to 35-45 percent in residential zones under Title 17. Coverage includes all structures with roofs, with some exemptions for uncovered decks and pervious surfaces.
Unincorporated Alameda County sets minimum front, side, and rear yard setbacks by zoning district under Title 17. Cities like Oakland, Fremont, Berkeley, Hayward, and Livermore adopt their own standards.
Alameda County limits residential structure heights to 30-35 feet in most R-1 zones under Title 17, with stricter limits in hillside overlays. ADUs are capped at 16-18 feet per state law.
Alameda County regulates grading under Title 15 and CBC Appendix J. Permits are required for cuts or fills over 50 cubic yards or 3 feet in depth; hillside overlays have stricter rules.
Alameda County requires erosion control during the rainy season (October 1 to April 30). Projects over 1 acre need a Construction General Permit and a SWPPP.
Alameda County participates in NFIP. FEMA maps designate Special Flood Hazard Areas along the Bay shoreline in Oakland, Alameda, San Leandro, Hayward, and creek corridors countywide.
Alameda County complies with SF Bay Regional Water Board MRP 3.0. Projects disturbing 10,000 sf or more must incorporate Low Impact Development treatment per Provision C.3.
HVAC condensers, heat pumps, and pool equipment in Alameda County must not exceed residential decibel limits at neighboring property lines: 60 dBA daytime and 50 dBA nighttime. Setback and screening are required for new installations.
Bars and nightclubs in unincorporated Alameda County operate under conditional use permits with noise conditions limiting amplified music, door-open times, and patron crowd noise. Violations can trigger ABC license review.
Standby and portable generators in Alameda County must comply with residential noise limits (50 dBA night, 60 dBA day) except during verified power outages. BAAQMD permits apply to larger stationary units.
Alameda County property maintenance rules require trash, recycling, and compost bins to be stored out of public view except during the collection window.
Alameda County, located in the San Francisco Bay Area, has no snow sidewalk clearing ordinance because measurable snowfall is extremely rare in unincorporated lowlands.
Alameda County requires vacant lot owners to maintain properties free of weeds over 12 inches, trash, and fire hazards. Annual weed abatement program inspects parcels before fire season.
Alameda County Nuisance Abatement Ordinance targets property blight including junk accumulation, overgrown weeds, graffiti, and derelict structures in unincorporated areas.
Alameda County unincorporated areas fall under California AB 1482 statewide rent cap limiting annual increases to 5 percent plus CPI, maximum 10 percent.
Alameda County unincorporated areas do not have a rental registration program. Landlords must comply with state disclosures but no county-level rental license is required.
Alameda County unincorporated areas are covered by AB 1482 just cause eviction rules requiring landlords to cite a specific lawful reason for terminating tenancies over 12 months.
Alameda County offers 3-business-day solar permitting under AB 2188 and SB 379. Systems must comply with Title 24 and the 2022 Solar Mandate for new homes.
Alameda County HOAs cannot prohibit solar under CA Civil Code 714 (Solar Rights Act). Only reasonable restrictions are allowed that do not significantly reduce efficiency or raise cost.
Alameda County unincorporated areas are served by Waste Management and Alameda County Industries with weekly collection. StopWaste coordinates countywide reduction mandates.
Alameda County residents receive bulk pickup appointments through their hauler for furniture, mattresses, and appliances. StopWaste operates household hazardous waste facilities.
Alameda County mandates recycling and organics separation under SB 1383 and StopWaste Mandatory Recycling Ordinance. Residents must separate paper, containers, and organics.
Alameda County requires trash, recycling, and compost bins to be placed curbside no earlier than noon the day before collection and removed within 24 hours after pickup.
Alameda County treats light trespass onto neighbors as nuisance under Title 17 and Civil Code 3479. Residential fixtures cannot exceed 0.5 foot-candles at adjacent property lines.
East Alameda County supports dark sky preservation near Lick Observatory. Title 17 requires shielded full-cutoff fixtures in rural and hillside zones, stricter near the observatory influence area.
HOAs in Alameda County operate under California Davis-Stirling (Civil Code 4000+). Board meetings require 4-day notice, open session participation, and minutes available within 30 days.
Alameda County HOAs follow Civil Code 5600-5740 for assessments. Regular assessments cannot increase more than 20 percent annually, and special assessments over 5 percent of budget require member approval.
Alameda County HOAs must offer Internal Dispute Resolution (IDR) under Civil Code 5900-5920 and Alternative Dispute Resolution (ADR) before filing most lawsuits. Both processes are low-cost alternatives to litigation.
Alameda County HOAs conduct architectural review under Civil Code 4765. Associations must provide fair, reasonable procedures with written decisions within a defined timeframe and a right to appeal to the board.
Alameda County HOAs enforce CC&Rs under Civil Code 5850-5865. Before imposing fines, associations must provide written notice, an opportunity to be heard, and a published schedule of monetary penalties.
Under CA Streets and Highways Code 5610, adjacent property owners are responsible for maintaining sidewalks fronting their property in Alameda County unincorporated areas.
Alameda County prohibits blocking sidewalks with vehicles, merchandise, overgrown vegetation, or construction materials. Clear 4-foot ADA-compliant passage must be maintained.
Alameda County's Code Enforcement Division investigates violations in unincorporated areas. Complaints can be filed by phone at (510) 670-5460, by email at PlanningCode.Enforcement@acgov.org, or by visiting the Community Development Agency offices.
Alameda County Code Enforcement typically conducts initial site visits within 3-5 business days of receiving a complaint. The full enforcement process, from initial notice to resolution, can take weeks to months depending on compliance and whether formal hearings are needed.
The most common code violations in unincorporated Alameda County include property nuisances (junk, debris, overgrown vegetation), junk vehicles, unpermitted structures, illegal grading, and zoning violations such as unauthorized land uses or setback encroachments.
Security cameras are legal on residential and commercial properties in Alameda County. Video-only recording in public-facing areas is permitted. Audio recording triggers California's strict two-party consent law (Penal Code 632), requiring all parties' consent.
In unincorporated Alameda County, residential fences up to 6 feet tall in rear and side yards generally do not require permits. Front yard fences are typically limited to 3-4 feet. Privacy fences can help establish reasonable expectation of privacy for legal purposes.
California is a two-party (all-party) consent state. Recording any confidential communication without all parties' consent is a crime under Penal Code 632. This applies to phone calls, in-person conversations, and audio on security cameras.
California maintains a state-level list of noxious weeds and invasive plants regulated by the California Department of Food and Agriculture. Alameda County follows state regulations and also participates in regional invasive species management through the Alameda County Weed Management Area.
Alameda County does not have a specific bamboo ban, but running bamboo that spreads onto neighboring properties can be addressed as a nuisance under county ordinances and California civil law. Property owners are responsible for preventing invasive spread.
Alameda County generally permits front-yard gardens including food gardens in unincorporated areas. California law (AB 2561) prohibits local governments from banning front-yard food gardens. Landscaping must comply with county zoning setbacks and water-efficient standards.
In unincorporated Alameda County, storage sheds under 120 square feet without electrical or plumbing are exempt from building permits. Larger sheds require permits. All sheds must meet setback requirements and height limitations.
Residential fences up to 6 feet tall in unincorporated Alameda County generally do not require building permits. Fences over 6 feet, retaining wall/fence combinations, and fences in front yards exceeding zoning height limits require permits.
Small ground-level decks (under 200 sq ft, less than 30 inches above grade, not attached to a building) are generally exempt from permits in Alameda County. Larger or elevated decks require building permits with structural plans.
Most renovation work in unincorporated Alameda County requires building permits. Cosmetic changes like painting and flooring replacement are exempt. Work involving structural, electrical, plumbing, or mechanical systems requires permits and inspections.