Say you're two months from listing a home on one of Agoura Hills' larger hillside lots, the kind with a mature oak holding down the backyard, and your contractor wants to reshape the patio to fit a pool before the listing photos go up. Before work starts, the key question is what the revised ordinance means for that tree.
As Citizen Portal reported, the city adopted a consolidated Protected Tree Ordinance, numbered 25-482, after its Planning Commission voted unanimously in October 2025 to forward the rewrite to City Council. Principal Planner Robbie Necipich framed the project publicly as a fix for enforcement gaps and slow permit timelines, with an explicit goal of reducing costs for single-family homeowners. In particular, the rewrite streamlines routine work while increasing mitigation owed for removing large, established trees.
What the ordinance actually changes
The city's Oak Tree Ordinance page says that before this rewrite, Agoura Hills protected any oak with a trunk diameter of two inches or more, a threshold so low that a volunteer seedling barely thicker than a garden hose could meet it. Mitigation for an approved removal was calculated using the percentage of canopy or root zone affected. The Los Angeles County code also required no fewer than four native replacement trees for any oak removed or relocated, no matter how that percentage worked out.
Ordinance 25-482 moves the size threshold to six inches in trunk diameter for nearly every protected species, roughly the width of a soda can, with one exception. Scrub oak stays protected at any size, because its shrubby, multi-stem form rarely produces a single trunk that would clear six inches anyway. The ordinance also adds two species to the protected list for the first time: California sycamore and Southern California black walnut, both now covered at that same six-inch threshold.
On the mitigation side, the canopy and root-zone percentage method is gone. Replacement obligations are now scaled directly to the trunk diameter of the tree removed, a change city staff described as increasing mitigation specifically for large-tree removals, even as the rest of the ordinance was built to reduce homeowner costs. Here's the comparison in one place:
| What changed | Before Ordinance 25-482 | Under the new rule |
|---|---|---|
| Protected size threshold | Two inches in trunk diameter for oaks | Six inches for most species, any size for scrub oak |
| Species covered | Native oak species only | Adds California sycamore and Southern California black walnut |
| Removal mitigation | Canopy or root-zone percentage, four-tree floor | Scaled directly to the trunk diameter of the tree removed |
| Permit structure | — | Three types: General, Hazardous, and Development |
| Fire-related removal fee | — | Free when tied to a fire department order |
| Minor permit fee | — | Around $250, with a separate fee resolution expected |
How the ordinance affects larger trees
The math changes the moment you're talking about removing or heavily encroaching on a tree big enough to matter to the property's character. Under the old percentage-based system, a large oak's mitigation depended on how much of its canopy or root zone the project disturbed, with four trees as the guaranteed minimum regardless of how that percentage came out. Under the new diameter-scaled system, a wide, established trunk drives the mitigation number directly, and city staff have been explicit that this was designed to raise what large removals owe, not lower it.
That's the part of the rewrite that a seller planning pre-listing improvements needs to sit with. The trees that make an Agoura Hills backyard photograph well, the wide canopy oaks and the sycamores with real height on them, are exactly the ones where the new math costs more, not less, if your project requires removing them.
Where the timeline gets tight
Construction near a protected tree can affect project planning. The protected zone extends from the tree's dripline out an additional five feet, so a pool shell, a retaining wall, or even a new irrigation trench can fall inside that boundary without the tree itself being touched. If your project sits in that zone, address permit planning early.
Escrow doesn't pause for that. The ordinance rewrite tried to reduce a related source of friction, too. Patricia Schultz, representing the Hill Rise Open Space Association, told the Planning Commission that homeowners often feel caught between fire-safety guidance calling for clearance around structures and tree preservation rules. The new Hazardous Tree Permit category exists partly to resolve that tension, waiving the fee entirely when the removal is tied to a fire department order.
What this means before you break ground
A few practical moves follow directly from how the ordinance is now structured.
- If a pool or addition can be redesigned to route around a protected tree instead of through its zone, ask about the fee waiver the city built in for exactly that kind of design modification.
- If the work is prompted by a fire-safety concern rather than a renovation, ask whether it qualifies for the Hazardous Tree Permit tied to a fire department order, since that path is free.
- Before finalizing pool or patio design near any mature tree, talk to the city's Oak Tree Consultant, who holds hours at City Hall on Tuesdays and can flag protected-zone conflicts before your contractor pours anything.
- The current roughly $250 fee for minor permits is described by city staff as provisional, with a formal fee resolution still pending as of the ordinance's adoption
None of this makes a legacy oak a liability. A mature tree is still one of the strongest visual assets a listing in this city can have, and buyers moving to Agoura Hills for the tree canopy and hillside character are not going to be talked out of that preference. What changed is the cost of altering one of those trees as part of getting a home ready to sell: mitigation for large-tree removals can be higher under the new system.
If you're weighing a pre-listing project on a lot with real tree cover, or trying to figure out what a specific parcel in Agoura Hills can support before you commit to a design, that's a conversation worth having early, not after the permit application is already in the queue. It's also the kind of detail that matters if you're evaluating a property for its improvement potential rather than just its current condition.
A few questions before you break ground
When is a Hazardous Tree Permit free? Removals tied to an actual fire department order fall under the Hazardous Tree Permit category, which is free.
Does a young oak that sprouted on its own count as protected? Only if it's a scrub oak, which is protected at any size. Other oak species are protected once the trunk reaches six inches in diameter, up from the two-inch threshold that used to apply to oaks. The newly added sycamore and black walnut are protected at six inches as well.
Every lot in this city carries its own mix of protected trees, slope, and prior permit history, and the fastest way to find out what your specific property is dealing with is a direct conversation before design work starts, not after. Tessa Cosentino works Agoura Hills alongside Malibu and the surrounding canyon and coastal communities, and can help you think through timing before a tree permit becomes a closing-week surprise. Let's Chat — Schedule a Time to Connect.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
