Ask what a home in Foster City costs right now and the answer changes depending on who you ask and when you ask it. In September 2026, one active-listing tracker put the citywide median at $1.38 million, or $859 a square foot. Sold-price data for the three months ending in April 2026 showed a median of $1.6 million, up 8.1 percent year over year. A June 2026 accounting of closed sales put the median at $1.43 million, down 28.5 percent from June 2025. A single-family-only tracker pulling from SAMCAR and MLSListings recorded July 2026's median at $2,122,500. That same tracker's April 2026 figure was $2,475,000, based on exactly two closed sales.
None of these numbers are wrong. They're measuring different things. Some count active listings, others count closings. Some blend condos and townhomes into the total, others isolate single-family homes only. And in April's case, the sample was so small that two transactions set both the median and the average for the entire month. The real story in Foster City isn't that the market went up or down. It's that "Foster City" isn't one market. It's at least four, stacked inside a single zip code, with a gap between the cheapest tier and the most expensive that runs well past a million dollars before water access even enters the conversation.
One City, Several Different Markets
Most of Foster City was built as planned-unit development, not detached single-family stock. That single fact does more to explain the price confusion than any seasonal trend. Condominiums and townhomes remain the most common entry point in the city, typically transacting in the $800,000 to $1.4 million range, while single-family homes form a comparatively thin slice of inventory that trades in a different price universe entirely. Buyers evaluating a condo or townhome in a planned-unit development should also budget for HOA dues that commonly run $400 to $900 a month as of mid-2026, a cost that shapes loan qualification as much as the sale price does.
A neighborhood-by-neighborhood ranking compiled roughly a month ago put this in concrete terms. Across the ten Foster City neighborhoods it priced, medians ranged from $1,270,000 in Metro Center, the city's office-tower and big-box retail district, up to $2,701,360 in Sea Colony, the largest neighborhood in the city and the one most fully organized around the water. Bay Vista landed at $2,215,070.
| Neighborhood | Median price (recent ranking) | What sets it apart |
|---|---|---|
| Metro Center | $1,270,000 | Office towers and retail, not primarily residential |
| Bay Vista | $2,215,070 | City's largest Eichler tract, built 1963 to 1968 |
| Sea Colony | $2,701,360 | City's largest neighborhood, organized around the lagoon |
That's a spread of more than $1.4 million within one small city, and it doesn't even capture the full range. Marina Point, described in that same ranking as the neighborhood "least about the water," anchors the affordable end with a mix of apartment complexes and a handful of detached homes. Treasure Isle, the city's oldest neighborhood, carries streets named for historic ships like Niantic and Balclutha and functions as close to a downtown as a planned lagoon city gets, with residential, retail, and office use sharing the same footprint. Isle Cove, condo-dense, remains one of the more accessible ways to get a Foster City address. Harbor Side puts more households directly on the water, street by street, than almost anywhere else in the city, mixing single-family homes with townhouses and condos rather than reserving lagoon frontage for detached estates alone.
What the Water Actually Buys
The widely quoted waterfront premium in Foster City runs 15 to 25 percent over comparable inland homes. That figure gets treated as if it reflects buyer taste alone, a simple willingness to pay more for a dock and a view. Part of it is something more structural.
Foster City's Waterfront Setback Policy, adopted as PC Policy 92-2001, imposes additional setback requirements on R-1 lots that front the lagoon, along with special fence, wall, and hedge standards, specifically to protect water views from neighboring properties. That policy sits inside the city's R-1 Single-Family Residence District rules under Municipal Code Chapter 17.12, and effective February 19, 2026, all new building applications, including remodels and rebuilds on existing waterfront lots, must comply with new objective Single-Family and Two-Family Design and Development Standards. In practical terms, a lagoon-fronting lot in Foster City has less buildable envelope than an equivalent inland lot, by design, because the city has written view protection directly into the zoning code.
Combine that with simple geography. The lagoon system covers roughly 218 acres and runs about 16.5 miles of channel through a city that was fully platted decades ago. There is no undeveloped shoreline left to subdivide. The premium on waterfront lots in Foster City isn't just a market signal responding to demand. Part of it is a supply constraint the city itself put in place and continues to enforce through its planning code.
Bay Vista adds an architectural layer on top of the water story. It holds the largest concentration of Eichler homes in the city, built between 1963 and 1968 with post-and-beam construction, glass walls, and atriums, sited on the streets and cul-de-sacs between Gull Avenue and Beach Park Boulevard. A buyer comparing Bay Vista to another lagoon-adjacent neighborhood isn't just comparing water access. They're comparing a specific mid-century architectural inventory that doesn't exist in the same concentration anywhere else in Foster City.
The Sample Size Problem
Foster City typically records only 5 to 20 single-family home sales in a given month. That's a small enough number that any single closing can move the reported median meaningfully, and in April 2026 the count dropped to just 2. When two homes set both the median and the average for an entire month, the resulting figure, $2,475,000, describes those two transactions more than it describes the market. Compare that to June 2026, when 17 closings (across all housing types) produced a $1.43 million median, or July 2026, when 8 single-family-only closings produced $2,122,500 at $1,142 a square foot with homes selling at 106 percent of list price in an average of 20 days. Three real, accurately reported numbers from the same year, none of them describing the same thing.
The practical takeaway for anyone comparing Foster City to another Peninsula city, or comparing one Foster City neighborhood to another, is to ask two questions before trusting a median: what's included, and how many transactions is it built on. A single month's snapshot in a market this thin is a data point, not a trend.
Reading a Foster City Comparison the Right Way
For a buyer specifically targeting lagoon access, the premium isn't the only variable that changes the real cost of ownership. Dock arrangements vary by property. Some waterfront homes carry a deeded private dock. Others sit in HOA communities where docks are shared and assigned by the association, or where community docks operate on a waitlist. That distinction affects both day-to-day use and resale value, and it's worth confirming before an offer goes in, not after.
Many waterfront homes, townhomes, and condos in Foster City fall under HOAs that maintain shoreline common areas, bulkheads, seawalls, and shared landscaping. Requesting the association's budget, reserve study, recent meeting minutes, and any pending special assessments is standard due diligence, and it matters more in waterfront communities where shared infrastructure carries real maintenance cost. Sellers preparing a listing in any building with elevated walkways should also confirm SB 326 balcony inspection compliance ahead of time, since it's the kind of item that surfaces during a buyer's inspection period and can slow or reprice a deal that otherwise looked straightforward.
A Short FAQ
Is Foster City's median home price over $2 million? For single-family homes tracked in isolation, mid-2026 medians clustered between $2.1 million and $2.5 million depending on the month and sample size. Citywide figures that blend in condos and townhomes, which make up most of the city's housing stock, run considerably lower, closer to $1.4 million to $1.6 million across the same period.
How much more does waterfront really cost? The commonly cited premium is 15 to 25 percent over comparable inland homes. The wider neighborhood-level spread, from roughly $1.27 million in Metro Center to $2.7 million in Sea Colony, reflects that premium plus zoning-driven scarcity and differences in housing product and architecture.
Why did 2026 market reports disagree so much month to month? Different trackers measure different things: active listings versus closed sales, all housing types versus single-family only, and month-to-month sample sizes that in Foster City's case ranged from as few as 2 single-family closings to as many as 25.
Comparing neighborhoods inside Foster City takes more than a single citywide number, and it takes knowing which of the four or five distinct markets a given address actually belongs to. If you're weighing a specific Foster City neighborhood against another, or trying to price a waterfront listing against the right comps rather than the wrong average, Chirko Group can walk through the neighborhood-level data with you and help you see what a given address is actually competing against.
