Los Angeles County — Oak Tree Permits

District-by-District Applicability

All Unincorporated Los Angeles County Zones

Chapter 22.174 applies by tree size and proposed impact, not by a named zoning district. A covered oak on a residential, commercial, agricultural, industrial, or other zoned lot in the County’s unincorporated areas is subject to the same permit trigger in § 22.174.030.A.

The chapter does not establish permitted uses, lot area, height, setbacks, floor-area ratio, or parking ratios for any district. Verify those separate rules through Los Angeles County Zoning, Los Angeles County Land Use, Los Angeles County Development Standards, and Los Angeles County Parking.

Specific Plan and Overlay Areas

Chapter 22.174 does not identify a separate oak-tree district or overlay designation. A parcel may also be subject to a Los Angeles County Specific Plans, Los Angeles County Overlay Districts, or Los Angeles County Hillside Management Areas rule set, but additional parcel-specific standards are not established by the Chapter 22.174 materials addressed here.

Verify with the jurisdiction whether a specific plan, overlay, or another County permit changes the applicable review path.

Exemptions

An Oak Tree Permit is not required in the following circumstances, provided the stated limits are met:

• A permit, variance, or subdivision tentative map—including a minor land division—was approved before August 20, 1982, the chapter’s effective date. § 22.174.030.B.1
• The County Forester determines after visual inspection that an emergency exists because an oak is hazardous or dangerous due to structural weakness, insect damage, decay, or irretrievable damage from flood, fire, wind, or lightning. The resulting exemption is filed with Regional Planning and expires after 90 days, after which a new inspection is required for a new exemption. § 22.174.030.B.2
• Emergency or routine public-utility maintenance is necessary to protect or maintain utility lines or other public-utility property. § 22.174.030.B.3
• Medium branch pruning does not exceed 2 inches in diameter and follows the stated tree-health guidelines. § 22.174.030.B.4
• The trees are planted, grown, or held for sale by a licensed nursery. § 22.174.030.B.5
• Work within an existing road right-of-way is needed for sight distance, clear street or sidewalk easements, or address damage to public infrastructure, as required by the Director of Public Works. § 22.174.030.B.6
• Eligible disaster-recovery temporary housing is involved under the disaster provisions specifically listed in the chapter. § 22.174.030.B.7

The emergency exemption is narrow: it depends on a County Forester determination, not solely an owner’s assessment that a tree appears unsafe. § 22.174.030.B.2

Application Materials and Site Analysis

An application must include the materials required by the Oak Tree Permit Checklist, plus the chapter’s additional submittals. § 22.174.040.A–B

The site plan must show:

• Proposed construction, excavation, grading, landfill, and any grade change inside each tree’s protected zone. § 22.174.040.B.1.a
• Each affected covered oak and each covered oak within 200 feet of proposed construction, grading, landfill, or other activity. § 22.174.040.B.1.b
• A unique identification number for each plotted tree, with a corresponding permanent tag on the north side of the tree. § 22.174.040.B.1.b
• The protected zone for each plotted tree. § 22.174.040.B.1.b
• The location and size of proposed replacement trees and all surface-drainage systems. § 22.174.040.B.1.c–d

An Oak Tree Report must be certified true and correct and prepared by a person whose expertise is acceptable to both the Director and Fire Department. It evaluates trunk size, canopy and protected zone, tree structure, tree health, the project’s impacts, recommended mitigation, potential heritage status, and any County resource-conservation-district identification. § 22.174.040.B.2.a

The Director may waive the report for removal of a single tree associated with a single-family residence that is a permitted use in the zone, and/or where the information is unnecessary to process the application. That is discretionary, not an automatic homeowner exemption. § 22.174.040.B.2.b

An accessory dwelling unit may be authorized under separate California ADU law, but that does not itself establish an exemption from Chapter 22.174 where the ADU-related work affects a protected oak. Verify with the jurisdiction.

Conditions, Replacement, and Construction Protection

Conditions may be imposed to support the required approval findings. The review authority may evaluate the surrounding vegetative character, the number of affected trees, replacement effectiveness, and development plans when deciding whether to require replacement. § 22.174.070.A

Where replacement is required, the baseline condition is at least a 2:1 ratio: exclusively indigenous oak trees, each at least 15-gallon and 1 inch in diameter one foot above the base. The authority may instead require one larger container specimen per replacement tree when feasible and warranted. § 22.174.070.A.6.a

Replacement oaks must be maintained for 2 years, and the permittee must replace any that die during that period. They are to be planted and maintained on the subject property, if feasible in the same general area as the removed trees; planting is supervised by a person with Fire Department-acceptable oak-care expertise. § 22.174.070.A.6.b–d

Common protective conditions include:

• Install and maintain chain-link fencing at least 4 feet high around protected zones; the Fire Department must inspect it before site activity begins. § 22.174.070.B.1
• Use hand tools or small hand-power equipment for approved excavation or grading within the protected zone or within 15 feet of the trunk, whichever distance is greater. § 22.174.070.B.3
• Protect other covered oaks on the property from storage, machinery, and construction access. § 22.174.070.B.4
• Permanently tag site-plan trees on the north side using noncorrosive, all-weather material. § 22.174.070.B.5
• Implement recommended corrective measures, such as pest control, pruning, or fertilization. § 22.174.070.B.6
• Avoid protected-zone utility trenching where feasible. § 22.174.070.B.7
• Keep the Oak Tree Report, location map, fencing plans, permit, and conditions available on site from the start of grading through development. § 22.174.070.B.8
• Provide the Fire Department’s oak-tree information manual to the owner, subsequent owners, and any homeowners association. § 22.174.070.C

Building-code compliance is separate from oak-tree approval; see the California Building Standards Code. Design changes prompted by tree protection may also require separate Los Angeles County Design Review review where independently applicable.

Checklist

• Confirm the parcel is in unincorporated Los Angeles County.
• Identify every oak of the genus oak that meets the 8-inch diameter / 25-inch circumference threshold, including qualifying multiple-trunk trees. § 22.174.030.A.1
• Confirm whether any smaller oak is a prior required replacement tree and therefore protected. § 22.174.030.A.2
• Determine whether the proposal involves removal, relocation, damage, or protected-zone encroachment. § 22.174.030.A
• Evaluate whether a specific exemption applies and, for an emergency, obtain the required County Forester determination. § 22.174.030.B
• Submit the Oak Tree Permit Checklist materials and a site plan showing all required trees, protected zones, work, drainage, and replacement trees. § 22.174.040.A–B.1
• Obtain a certified Oak Tree Report unless the Director grants a report waiver. § 22.174.040.B.2
• Plan for any imposed replacement, maintenance, tagging, fencing, and on-site-document conditions. § 22.174.070
• Do not begin protected-tree work until required fencing is installed, inspected where required, and permit documents are available at the site. § 22.174.070.B.1, B.8

Risks & Ambiguities

Plain-English Summary

If a mature oak on your unincorporated Los Angeles County property is 8 inches or more in diameter, you usually cannot remove it, damage it, move it, or build into its protected zone without an Oak Tree Permit. Plan early: the County may require a tree report, protective fencing, and replacement indigenous oaks at at least a 2:1 ratio. § 22.174.030.A; § 22.174.070

Source References

• Los Angeles County Zoning Code, Oak Tree Permit purpose — § 22.174.010
• Los Angeles County Zoning Code, definitions cross-reference — § 22.174.020
• Los Angeles County Zoning Code, applicability and exemptions — § 22.174.030
• Los Angeles County Zoning Code, application and review procedures — § 22.174.040
• Los Angeles County Zoning Code, conditions of approval — § 22.174.070
• Los Angeles County zoning & planning overview
• Los Angeles County Development Standards