In May 2026, single-family homes in Los Altos Hills closed with a median of 9 days on market, according to MLSListings data for the town, with sales landing at 101% of list price. Widen the lens to Redfin's trailing three-month window ending that same month and the picture shifts: median days on market climbs to 15, up from 9 a year earlier, while the reported median sale price drops to $5.3 million against the single month's $6,865,000 figure from MLSListings.
Both numbers are accurate. Neither is wrong. The gap between them has less to do with how many buyers want to live in Los Altos Hills this summer and more to do with which sellers had their paperwork ready before the sign went up.
A market too thin to average cleanly
MLSListings counted 12 closed sales in Los Altos Hills in May 2026, against 15 active listings and 1.9 months of supply. Redfin counted 28 sales for the same month. Either way, this is a market measured in the dozens, not the hundreds of monthly closings you'd see in a larger city. When a market that thin includes even one estate at the very top of the range, or misses one that closed a week later, the median can move by hundreds of thousands of dollars without any real shift in what buyers are willing to pay for a comparable home. Larger lots also tend to carry a lower price per square foot than smaller, more finished properties, so a month with more big-acreage closings can pull the average down even while individual sellers are getting strong outcomes.
None of this makes the 9-day figure fake. It means the 9-day figure describes homes that were ready to sell the moment they hit the market, not homes that needed weeks of catch-up after an offer arrived. If you're preparing to list an estate here, the paperwork is the variable you actually control, and it's also the one most sellers put off.
Septic work has a season, and the season starts to matter now
Large sections of Los Altos Hills have no public sewer, so private septic systems are common on the acre-plus lots that define the town. The Town's own septic bulletin sets rules you won't find in more urban jurisdictions. Installation or repair work on a septic system is prohibited between November 1 and April 1 each year, with emergency repairs allowed only if the Town approves an erosion control plan first. Systems generally require two drainfields, each engineered to handle half of the required capacity, connected through an approved diversion valve, plus a reserve area sized for a full future expansion. Evaluating a site in the first place means excavating a soil profile trench to a depth of at least 11 feet with the county's Department of Environmental Health present to observe it. The Town also recommends pumping every three to five years to keep solids from reaching the drainfield.
Today is August 10, 2026. The seasonal freeze on septic work begins in about twelve weeks. If a buyer's inspector finds a problem with your system in October, you likely still have time to address it before the window closes. If that same discovery happens during a December escrow, the fix waits until spring, and so does your closing, unless the Town signs off on emergency erosion control work in the meantime. A pumping record and a current evaluation, done before you list, is what keeps that discovery from ever landing on someone else's timeline.
The well file that might not exist
Wells on Los Altos Hills parcels sit under a different set of records, held by a different agency, and those records don't reach back as far as most sellers assume. Santa Clara County's Department of Environmental Health requires clearance before construction of any water well in the county, but its own well log records only date to 1989. The Santa Clara Valley Water District holds older logs, back to the early 1970s, but if your well predates both systems or was drilled by an owner who never filed paperwork, there may be no county record to pull at all. In that case, the only way to establish current capacity is a fresh flow and water quality test, not a request for an old file. If the flow test comes back at 10 gallons per minute or less, the county requires a minimum 1,000-gallon storage tank in addition to whatever the fire department separately requires for the property.
Lenders add their own layer here. FHA and VA financing both require documented proof that well water is safe and sufficient before they will fund a purchase, which means a buyer using either loan type cannot close until that documentation exists, regardless of how quickly the rest of the transaction is moving.
Private roads come with a governance structure, not just a driveway
A meaningful share of Los Altos Hills properties sit behind long private driveways or shared roads rather than town-maintained streets. The Town's model road maintenance agreement, the kind recorded against many parcels here, establishes a Road Commission Agent elected by a majority of the properties sharing that road. That agent monitors the road's condition and initiates maintenance, and disputes among owners are resolved through binding arbitration where each participating owner gets one vote in selecting the arbitrator. If a lawsuit becomes necessary, the prevailing party can recover attorney fees.
Buyers and their attorneys ask for a copy of this recorded agreement as a matter of course once they know a property sits on a shared road. If you don't have a copy on hand, retrieving it means a records request to the county rather than a phone call to a neighbor, and that takes real time.
Sewer-connected properties aren't exempt from infrastructure disclosure either. Where Los Altos Hills does have sanitary sewer service, the Town is explicit that the property owner remains responsible for maintaining, repairing, and replacing the lateral line from the building to the main connection, along with the "Y" fitting at the main, the sewer relief valve, and the backflow preventer. A buyer who assumes sewer service means zero infrastructure responsibility is working from an incorrect assumption, and correcting that assumption after an offer is accepted is a worse conversation than disclosing it up front.
Where the record actually lives
| Disclosure item | Where you'd need to go to document it |
|---|---|
| Septic evaluation, pump history | Licensed septic evaluator plus Santa Clara County Department of Environmental Health, per Town bulletin requirements |
| Well flow and water quality | Fresh lab testing; county well logs only go back to 1989, Valley Water's to the 1970s |
| Recorded road maintenance agreement | Santa Clara County Recorder's Office, referencing the parcel's specific access easement |
| Sewer lateral condition | Owner's own maintenance records; Town confirms responsibility stops at the main, not the property line |
None of these live in a single file. That's precisely why sellers who start gathering them the week an offer arrives end up on the slow side of the market, while sellers who gather them before the sign goes up end up closer to the 9-day headline.
Frequently asked questions
Does every Los Altos Hills home rely on a septic system or private well? No. Parts of town have sanitary sewer service, and some properties connect to a public or shared water system. Even where sewer service reaches the property, the owner remains responsible for the lateral line, the connection fitting, and the backflow preventer.
What happens if my septic system needs repair during the November to April window? Non-emergency work waits until after April 1. Emergency repairs may proceed sooner only if the Town approves an erosion control plan first, so an evaluation done well before winter gives you the most options.
How do I find out if my property is on a private road with a recorded maintenance agreement? Check your title report or deed for a recorded access easement, or search Santa Clara County Recorder's Office records for the parcel. If a road maintenance agreement exists, it will be recorded against the property.
Getting ahead of it
A 9-day sale in Los Altos Hills isn't luck. It's the outcome of a seller who completed the septic evaluation, the well test, and the title pull before the listing went live, not after an offer created a deadline. Shabber Jaffer works through that sequence with sellers before a property hits the market, applying the same discipline he brought to financial statements during his years as a startup CFO to make sure the numbers and the paperwork agree with each other before a buyer ever asks. If you're weighing a listing before winter, Shabber Jaffer offers a free home valuation as the first step toward figuring out what your specific property needs before it goes live.
