How Altadena Handles Tree Protection: A Practical Guide

If you live in Altadena or are thinking about moving there, tree protection are one of those things you probably won't think about until they affect you directly. Altadena has 2 specific rules on the books covering different aspects of tree protection, and some of them might surprise you.

Tree Removal Permits

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.

Key details: Code Section: LA County Code 22.174.040. Protected Size: ≥8 in DBH. Permit Authority: LA County Planning. Required: Arborist report. Penalty: Up to $1,000/tree + 2:1 replacement.

Unpermitted oak removal is a misdemeanor under Section 22.174.080 — fines up to $1,000 per tree, replacement (typically 2:1), and restitution for tree value.

Compared to other cities, Altadena takes a harder line on tree removal permits. The enforcement and penalty structure reflects that.

Heritage & Protected Trees

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.

Key details: Heritage Threshold: ≥36 in DBH. Code Section: LA County Code Ch. 22.174. Replacement Ratio: Up to 4:1.

Unpermitted Heritage Oak removal triggers enhanced penalties under 22.174.080 — fines and replacement value can exceed $10,000 per tree based on appraised value.

Compared to other cities, Altadena takes a harder line on heritage & protected trees. The enforcement and penalty structure reflects that.

The Bottom Line

Altadena is tougher than many cities when it comes to tree protection. Out of the 2 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in Altadena, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

These rules come from Altadena's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.