Lake Forest, CA Landscaping Rules: Tree Removal & Heritage Trees (2026)
Tree removal permit rules in Lake Forest, CA, sometimes called heritage tree, protected tree, or street tree ordinances, list which trees require a permit before you can cut them down.
Key Facts
- Applies to
- SB 9 duplexes and urban lot splits only
- Mature tree defined
- 6-inch diameter or 8-foot height
- Replacement ratio
- 2 mature trees per tree removed
- Governing chapter
- LFMC Chapter 9.52, Two Unit Projects
Summary
Lake Forest, California requires any mature tree removed for a state-mandated SB 9 duplex or urban lot split to be replaced with at least two mature trees of the same type and equal or larger trunk diameter.
No mature tree may be removed on a lot with any development under this section unless removal is necessary to constructing a dwelling unit that must be allowed under State law.
ii. "Mature tree" means a tree with a diameter of six inches or more or a height of eight feet or taller.
iii. A tree may only be removed under subsection (F)(8)(a)(i) above if it is replaced with at least two mature trees of the same type and with a trunk diameter that is the same or larger than that of the removed tree.
b. Evergreen landscape screening must be planted and maintained between each dwelling and adjacent lots (but not rights of way) as follows:
i. At least one 15 gallon size plant shall be provided for every five linear feet of exterior building wall. Alternatively, at least one 24 inch box size plant shall be provided for every 10 linear feet of exterior wall.
ii. Plant specimens must be at least six feet tall when installed. As an alternative to the planting required by subsection (F)(8)(b)(i) above, a solid fence of at least six feet in height may be installed.
9. Nonconforming Conditions. A two unit project may only be approved if all nonconforming zoning conditions are corrected.
10. Utilities.
a. Each primary dwelling unit on the lot must have its own direct utility connection to the utility service provider.
b. All utilities must be underground.
11.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4722652; v7 updated 2026-02-17).
Full Breakdown
Government Code Section 65852.21 (SB 9) requires Lake Forest to ministerially approve two-unit residential projects; the city implements this mandate in Municipal Code Chapter 9.52. Section 9.52.050(F)(8)(a) restricts tree removal on any lot undergoing such a project: no mature tree, defined as six inches in trunk diameter or eight feet tall, may be removed unless removal is necessary to build a unit state law requires the city to allow, and any removed tree must be replaced with at least two mature trees of the same type and equal or larger trunk diameter. The identical two-for-one rule also governs SB 9 urban lot splits under Chapter 7.50.
Violations & Fines
Removing a mature tree without providing the required two-tree replacement breaches the two-unit project's approval conditions and can trigger code enforcement action against the property owner.
Frequently Asked Questions
Does this apply to any tree removal in Lake Forest?
What counts as a mature tree under this rule?
Sources & Official References
Other rules in Lake Forest
California rules heatmap·Compare Lake Forest to another location·View the California landscaping rules overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Tree Removal & Heritage Trees in Nearby Cities
How other cities in Orange County handle tree removal & heritage trees.