The Real Permit Bottleneck for a Los Altos Teardown Isn't Zoning. It's the Trees.

Most Los Altos buyers who write an offer on a 1950s or '60s ranch with rebuild potential are thinking about the building department. They picture demolition, then a foundation, then framing, timed against a construction loan and a school year. What they aren't pricing in is the backyard.

In 2024, Los Altos rewrote its Tree Protection Ordinance, and the rewrite quietly changed which trees on an established lot count as protected. That change now sits ahead of the building permit in the sequence, and it can add months to a schedule that a buyer assumed was mostly a design and construction problem.

What "protected" used to mean, and what it means now

Before the update, a tree needed a trunk of 15 inches in diameter to require a permit before removal. The new ordinance lowers that threshold to 12 inches for most species, and to 10 inches for native trees such as oaks, which the city singled out because natives need less maintenance, tend to survive better, and support local wildlife. That drop sounds small until you walk a typical Los Altos lot that has been landscaped for forty or fifty years. Trees that were saplings when a family bought the house in 1975 have long since crossed both thresholds.

The city raised the removal fee from $75 to $300 to bring it in line with neighboring cities, and added a $1,200 in-lieu fee when a removed tree isn't replaced in kind. Unauthorized removal of a protected tree now carries a fine of $5,000 or more, and heritage tree violations can be assessed at full appraised value. None of this is a subtle cost. It's a line item that didn't exist, or existed at a much smaller scale, before the rewrite.

The practical effect for a rebuild is this: a landscape plan that never touched a permit application under the old rule almost certainly needs one now. If your due diligence period doesn't include a walk of the lot with a certified arborist, you're finding this out after you've already committed to a purchase price built on a demolition timeline that no longer holds.

The permits stack before you ever touch the foundation

A demolition permit is separate from, and has to be finalized before, a building permit. Layered on top of that: a Bay Area Air Quality Management District asbestos notification number and sewer cap coordination, both of which have to be documented as part of closing out the old structure. If protected trees are anywhere near the building footprint, add the tree side of the process to that stack.

The city targets 30 days to process a complete tree removal application, and heritage tree removals carry a 10-day public notice period before approval, on top of the arborist report itself. None of that overlaps neatly with the demolition and asbestos sequence. It runs in parallel at best, and it can gate the start of grading if a tree the framing plan assumed would come out turns out to require mitigation, replacement, or a redesign of the footprint to preserve a root zone.

A buyer who assumes "close, demo, build" as one continuous line is going to be surprised by how many discrete approvals sit inside that first word. A seller marketing a property as rebuild-ready owes a buyer, and honestly owes themselves during pricing, a clear-eyed look at what's actually standing on the lot before either side treats the existing structure as worthless.

The "two lots for the price of one" pitch doesn't hold up as often as it's marketed

SB9, the state law that allows a single-family lot to be split into two under specific conditions, gets mentioned in a lot of Los Altos listing language as upside. The reality on the ground is narrower than the pitch. In a staff report presented to the Los Altos City Council in mid-2024, city planning staff noted that 18 SB9 applications had been submitted to date, but only 9 of those requested an urban lot split rather than a two-unit development on a single lot. That split has likely shifted since, but it's a useful signal that most owners pursuing SB9 in Los Altos aren't actually dividing their parcel. One third-party site that grades how restrictively California cities have implemented the law scores Los Altos a C, citing the volume of local conditions layered on top of the state framework.

Tree protection and objective design standards still apply to any lot being split under SB9, which means the same 12-inch and 10-inch thresholds that govern a straightforward teardown also govern whether a lot can be divided in a way that leaves each resulting parcel with a workable building envelope. A lot that looks like an obvious two-for-one on a plat map can turn out to have a mature oak sitting exactly where the new lot line needs to go.

None of this means SB9 has no value in Los Altos. It means the value is parcel-specific, and it depends on a feasibility read that accounts for the trees, setbacks, and access on that exact lot, not a general assumption that the law applies evenly across the city.

Why the median price won't sit still

If you've compared Los Altos price reports recently, you may have noticed they don't agree. One widely used housing data source put the three-month median sale price at $4.2 million for the period ending in May 2026, down 13.8 percent year over year. A local brokerage's first-quarter 2026 report put the median above $5 million, at $5,068,000, up 4 percent from the year before, with the top sale of the quarter at $8.5 million.

Both numbers can be accurate at the same time, and the reason is the same dynamic driving everything above. Los Altos's sales mix right now includes lots being sold for land value with a dated structure still standing, and it includes finished, newly built homes on similarly sized lots. Those are two different products wearing the same zip code. A quarter with more land-value sales pulls the median down. A quarter with more finished rebuilds closing pulls it up. Neither report is wrong. They're sampling different points in the same rebuild pipeline this article is describing, which is exactly why a single median figure tells you less about Los Altos right now than it would in a market where most homes sell close to their original condition.

What this means before you write an offer or set a list price

If you're buying with rebuild plans, get a certified arborist onto the lot during your inspection period, not after close. Ask specifically which trees clear the 12-inch or 10-inch threshold and whether any qualify for heritage designation, since that status changes both the process and the potential fine exposure.

If you're selling a long-held property and your agent's marketing leans on "SB9 potential" or "teardown value," ask for a parcel-specific read before that language goes into the listing. A generalized pitch about lot splits or land value that doesn't account for what's actually growing on the property can set a buyer's expectations in a direction the permitting process won't support, which tends to surface as a renegotiation once due diligence starts rather than a clean close.

A few direct questions

Does a dead or hazardous tree still require a permit to remove? No. The city's updated ordinance specifically excludes trees that are dead, diseased beyond recovery, or deemed hazardous from the permit requirement.

How long should I budget for a tree removal permit? The city targets 30 days for a complete application, and heritage tree removals add a 10-day public notice period before approval. Budget for the arborist report itself as a separate, earlier step.

Can I still pursue an SB9 lot split if the property has large trees? Possibly, but tree protection and objective design standards apply to lot splits the same way they apply to a standard remodel or rebuild. The split has to produce a buildable envelope on each resulting parcel once those standards are applied, which is a parcel-specific question rather than a citywide yes.

Whether you're pricing a legacy property for sale or evaluating a lot for a ground-up build, the trees on it are doing more to shape your timeline and your numbers than most closing documents will tell you upfront. If you want a read on a specific Los Altos property, reach out to Gretchen Swall to schedule a confidential consultation.