Moving to Altadena, CA?

Exterior noise in Altadena's residential zones is capped at 50 dBA daytime / 45 dBA nighttime (single-family); 55/50 dBA (multi-family); 60/55 dBA commercial; 70 dBA all hours industrial.

Altadena is unincorporated, so LA County Title 12 Chapter 12.08 (Noise Control) applies. Nighttime exterior limits run 10:00 p.m. to 7:00 a.m. with stricter dB caps; daytime runs 7:00 a.m. to 10:00 p.m.

LA County Code Section 12.08.440 limits construction noise in residential areas to 7:00 a.m.–8:00 p.m. weekdays and 8:00 a.m.–8:00 p.m. on Saturdays. No construction is allowed on Sundays or county holidays.

LA County Code Section 10.36.010 prohibits owning or keeping any animal that habitually disturbs the peace by barking, howling, or other noise. Enforced by LA County Animal Care & Control.

LA County does not have a county-wide gas leaf-blower ban, but operation is subject to the Ch. 12.08 dB limits and construction-hours rules (7 a.m.–8 p.m. weekdays).

Altadena STRs must register annually with the LA County Treasurer & Tax Collector under LA County Code Chapter 7.96 (Title 7, Division 3). Registration is limited to a Host's Primary Residence — ADUs and vacation rentals are ineligible.

Un-hosted short-term rentals in Altadena are capped at 90 nights per calendar year. Hosted stays (host on-site) have no annual cap, but every stay is limited to 30 consecutive days or less.

Hosts must register annually with LA County TTC, pay $914, and submit a sworn affidavit affirming primary-residence status, a local responsible contact reachable 24/7, and consent of the property owner.

LA County does not require a specific liability insurance amount, but Hosts must provide working smoke detectors, CO detectors, flashlights, and tagged fire extinguishers (7.96.070.F-G).

STR hosts in Altadena must collect and remit a 12% Transient Occupancy Tax (TOT) under LA County Code Chapter 4.72, plus pay the $914 annual registration fee under Section 7.96.040.

STRs may not adversely affect neighborhood character via noise, vibration, glare, odors, or other nuisance under LA County Code Section 7.96.060.L; underlying noise limits in Ch. 12.08 still apply.

STR hosts must make on-site parking required under Sections 22.112.060 and 22.112.070 available to guests, and must post parking capacity and rules inside the unit (Section 7.96.070.H.2).

Guest occupancy is limited to two persons per bedroom plus two additional, with an absolute maximum of 12 guests per booking per LA County Code Section 7.96.060.K.

All fireworks — including 'Safe and Sane' — are illegal in unincorporated LA County including Altadena under LA County Fire Code Title 32 Section 5601.3.

Altadena sits in or adjacent to Very High Fire Hazard Severity Zones (Eaton Canyon, foothills). LA County Fire Code Title 32 restricts open flames and recreational fires; STRs in VHFHSZ must post a no-flame notice (LA County Code 7.96.060.O).

Open outdoor burning of vegetation is generally prohibited in unincorporated LA County. SCAQMD Rule 444 governs agricultural and rangeland burning; permits required from LA County Fire.

Altadena is largely in a Very High Fire Hazard Severity Zone. LA County Fire requires year-round brush clearance within 200 feet of any structure and 10 feet of combustible fences and roadways.

Most of Altadena sits in CalFire-mapped Very High and High Fire Hazard Severity Zones — the January 2025 Eaton Fire destroyed thousands of structures here. Properties in these zones face heightened defensible-space, ember-resistant construction, and disclosure requirements.

LA County Code Section 22.112.080 allows RV/boat storage in residential zones only in side or rear yards behind the required front setback, screened from view. Street RV parking is limited under Title 15.

LA County Code Chapter 15.36 (Abandoned Vehicle Abatement) authorizes the county to remove inoperative or abandoned vehicles from private or public property after notice. Funded by the AVA fee on vehicle registration.

Altadena CSD requires 2 on-site parking spaces for 1–4 bedroom homes, 3 for 5–6 bedrooms, and 4+ for 7+ bedrooms. Where 3+ spaces are required, the extras may be uncovered and developed in tandem.

LA County Title 15 (Vehicles and Traffic) governs Altadena streets. Standard rules: 72-hour limit on parking the same vehicle in one spot, no parking against curb direction, and posted street-sweeping zones enforced by LA County Sheriff & Public Works.

Altadena is an unincorporated community in Los Angeles County, so EV charger installations are permitted by LA County Public Works Building & Safety Division at the East LA District Office. New one- and two-unit single-family homes must be EV-Capable with conduit and panel space for a Level 2 charger under the 2022 California Building Standards Code (CBSC) and CalGreen §4.106.4. EVSE installations rated under 400 amps do not require an electrical plan check and may be permitted over-the-counter or through EPIC-LA, the County's online permit portal.

Pool barriers in Altadena must be at least 60 inches tall, with no more than 2 inches gap below, and gates self-closing and self-latching with latch at least 60 inches above ground (LA County Building Code Manual 3109.2).

Altadena CSD caps front-yard fences at 42 inches within 10 feet of the right-of-way (with open/non-view-obscuring design ≥80% transparency required for taller fences), and 6 feet beyond 10 feet from the right-of-way.

New/replacement fences in Altadena front yards may not be composed of barbed wire, concertina wire, razor wire, or broken glass. Chain link over 42 inches must be covered with live plant material.

LA County allows backyard chickens in R-1 zones in unincorporated areas (including Altadena) subject to coop setbacks under LA County Code Title 10 and Title 22. Roosters and large flocks may require additional permits or be restricted.

LA County Code Section 10.32.010 prohibits dogs running at large in any public place or private property other than the owner's, unless restrained by a chain or leash no longer than 6 feet.

Outdoor watering in Altadena (served by Lincoln Avenue Water Co., Las Flores Water Co., Rubio Cañon, and Kinneloa Irrigation District) is limited to 2 days per week assigned by address — typically Mon/Thu odd, Tue/Fri even — with 10-minute-per-zone caps.

In Altadena's Very High Fire Hazard Severity Zones, grass and weeds must be kept under 3 inches under LA County Fire Code Title 32 defensible-space rules.

Oak trees (genus Quercus) with a trunk circumference of 25 inches or more (8-inch diameter at 4.5 ft above grade) are protected — removal, damage, or encroachment into the protected zone requires an Oak Tree Permit under LA County Code Chapter 22.174.

Trimming protected oak trees (≥8 in DBH) requires an Oak Tree Permit if the work enters the protected zone or removes >25% of crown. Street trees in the public right-of-way are maintained by LA County Public Works.

LA County Fire's Brush Clearance program also functions as the weed-abatement ordinance — vacant and improved lots must keep weeds and grasses cut to under 3 inches in fire-hazard areas. Annual notices issued each spring.

Altadena CSD allows up to 2 home-based occupations per property with no more than 1 client visit or 1 client vehicle per hour, and a maximum of 2 non-resident employees per property (Section 22.306.070.A.7).

Every new or remodeled residential pool in Altadena requires a 60-inch barrier with self-closing/self-latching gates plus at least 2 additional safety features under the California Pool Safety Act.

All swimming pools, spas, and hot tubs in Altadena require a building permit from LA County Building & Safety under Title 26 (Building Code) plus a plumbing permit and electrical permit for equipment.

Altadena is an unincorporated CDP in Los Angeles County governed by LA County Code Title 22 §22.140.640 (Accessory Dwelling Units and Junior Accessory Dwelling Units), most recently amended April 2024. Single-family lots may add one ADU plus one JADU; multifamily lots may add up to two detached new-construction ADUs plus conversion ADUs in non-livable existing space.

Garage conversions to ADUs in unincorporated Altadena are governed by LA County Code Title 22 §22.140.640 and California Government Code §65852.2. No replacement parking is required when an existing garage is converted, and existing setbacks are grandfathered. Properties in Very High Fire Hazard Severity Zones also trigger Chapter 7A wildland-urban interface standards.

Carports in Altadena are accessory structures regulated under Altadena CSD 22.306.070 and LA County Code 22.110.040. They count toward the lot-coverage formula and the 2-space minimum parking requirement.

Sheds 120 sq ft or smaller and ≤12 ft tall typically don't need a building permit in Altadena, but they still must comply with Altadena CSD setbacks. Anything larger needs a permit.

Most of Altadena is in FEMA Flood Zone X (minimal hazard), but the area along Eaton Wash, the Arroyo Seco tributaries, and post-Eaton Fire burn-scar areas have heightened flood and debris-flow risk. LA County Code Ch. 22.142 (Floodplain Management) applies in mapped Special Flood Hazard Areas.

All grading and disturbed sites in Altadena must implement erosion controls under LA County Building Code Title 26 Appendix J and the County's MS4 permit. Rainy-season grading (Oct 15 – Apr 15) requires Best Management Practices approved by Public Works.

LA County operates under a regional MS4 permit issued by the LA Regional Water Quality Control Board. LA County Code Title 12 prohibits discharging non-stormwater (sediment, chemicals, paint, sewage, washwater) into storm drains.

Hillside grading exceeding 2,500 cubic yards cut + fill requires a Conditional Use Permit in Altadena (CSD 22.306.060.B.2.b). Grading during the Oct 15 – Apr 15 rainy season is subject to Public Works erosion-control requirements.

All commercial cannabis activity — including retail dispensaries, cultivation, manufacturing, testing, and distribution — is banned in unincorporated LA County (including Altadena) under Ordinance 2017-0025.

California Proposition 64 (Health & Safety Code 11362.1) allows adults 21+ to cultivate up to 6 cannabis plants for personal use. LA County Ordinance 2017-0025 limits cultivation to indoor or secured outdoor areas not visible to the public.

Residential solar permits in Altadena are issued by LA County Building & Safety under SB 1222/AB 2188's streamlined permitting — typically 3 business-day approval, $400–$500 typical fee.

Political signs on private property in Altadena are protected speech under the First Amendment (Reed v. Town of Gilbert, 2015). LA County Code Ch. 22.116 limits aggregate residential sign area but cannot impose content-based restrictions.

Trash, recycling, and green waste bins must be set out for collection on the designated pickup day and removed from the street within 24 hours after pickup. Service is by exclusive franchise haulers (Athens Services for most of Altadena).

LA County Code Title 11 (Health and Safety) and the Nuisance Abatement provisions in Title 22 prohibit accumulating trash, junked vehicles, overgrown vegetation, or maintaining buildings in disrepair. Enforced by LA County Code Enforcement.

LA County Code Section 22.140.470 (Outdoor Lighting) requires all outdoor lighting to be shielded so that direct illumination does not cross the property line, with hard caps in residential zones.

Tenants in Altadena covered by the LA County RSTPO can be evicted only for an enumerated 'just cause' — non-payment, lease violation, nuisance, owner move-in, withdrawal from market (Ellis Act), or substantial remodel — with relocation assistance for no-fault terminations.

The LA County Rent Stabilization & Tenant Protections Ordinance (RSTPO) caps annual rent increases in covered Altadena multi-unit buildings (built before Feb 1, 1995) at 3% or 60% of CPI, whichever is lower (effective 2025).

California SB 1383 requires all residents and businesses in Altadena to separate organic waste (food scraps + yard trimmings) from trash. LA County Code Chapter 20.87 implements at the county level via Athens Services' three-bin program.

Drone airspace is federally regulated — 49 USC 44809 governs recreational use. Altadena is under JWA/Burbank/LAX/El Monte airspace controls. LA County parks prohibit drone takeoff/landing under Section 17.04.560.

Mobile food facilities operating in Altadena need a LA County Department of Public Health Mobile Food Facility permit, a LA County business license under Title 7, and must operate from approved commissaries.

Door-to-door commercial solicitors in Altadena must obtain a business license under LA County Code Title 7 and respect 'No Soliciting' signs. Non-commercial canvassing (political, religious) is protected speech.

LA County Code Section 13.56 sets a curfew for minors under 18 from 10:00 p.m. to sunrise (school nights) and 12:00 midnight on weekends, in any public place in unincorporated areas.

County parks in Altadena (e.g., Loma Alta, Farnsworth, Charles White Park) close at sunset. LA County Code Section 17.04.530 makes it unlawful to be in a county park between sunset and sunrise without special permit.

Altadena R-1 max height: 35 ft on lots ≥20,000 sf; 30 ft on lots <20,000 sf and flag lots. Maximum 2 stories above grade. No portion of any structure may exceed 23 ft if within 15 ft of any property line.

Altadena R-1 setbacks: front = smallest existing front yard on the same block (min 20 ft); rear = 35 ft (lots ≥20,000 sf) or 25 ft (lots <20,000 sf); side = 10% of avg lot width, min 5 ft interior / 10 ft reverse corner.

Altadena R-1 max Gross Structural Area (GSA) and lot coverage = (0.25 × net lot area) + 1,000 sq ft, never exceeding 9,000 sq ft total (Altadena CSD 22.306.070.A.4).

Removing or significantly damaging a native oak with an 8-inch trunk diameter (25-inch circumference) at 4.5 ft above grade requires an Oak Tree Permit from LA County Planning under Section 22.174.040.

Oak trees ≥36 inches in diameter qualify as Heritage Oaks under LA County Code Chapter 22.174 and receive heightened review. Removal is rarely approved.

LA County Code Chapter 7.86 limits garage sales in residential zones to no more than 2 per calendar year per address, with each sale lasting no more than 3 consecutive days. No permit is generally required for compliant sales.

HOAs in Altadena are governed by California's Davis-Stirling Common Interest Development Act (Civ. Code 4000 et seq.). LA County does not enforce private CC&Rs — disputes go to the HOA's internal dispute resolution and ultimately Superior Court.

LA County Code Title 30 (Residential Code) and Title 28 (Plumbing) require an automatic seismic gas shutoff valve on any new or substantially remodeled residence with natural gas service. Existing homes have no retrofit mandate.

Commercial filming in Altadena's unincorporated areas requires a permit from FilmLA (the official film office contracted by LA County). Permits cover insurance, neighborhood notification, parking, and police/fire monitoring.