A buyer comparing two San Ramon listings this month might find them within $10,000 of each other on price. One sits in Central San Ramon, an established pocket near Bishop Ranch. The other is a few miles east in Windemere, part of the Dougherty Valley area that includes Gale Ranch. Same city, same school district, nearly the same sale price. What that buyer often does not see until escrow is that the two homes can carry very different monthly bills, and that the citywide median they used to sanity-check both prices was already hiding two different markets before the tax question ever came up.
That is the thing about a single median number for a city as varied as San Ramon. It tells you almost nothing about which of its neighborhoods is actually gaining ground, and it says nothing at all about a recurring charge that some San Ramon parcels carry and others do not.
The Median Is Averaging Two Different Trends
Redfin's neighborhood-level data, updated as of July 2026, shows Central San Ramon's median sale price at $1.5 million over the trailing three months, up 1.3% year over year, with price per square foot up a sharp 16.6%. In that same update, Southern San Ramon's median sale price for the most recent month came in at $1.3 million, down 10.2% year over year, even though it sold in a median of just 9 days. Two sub-markets inside the same city, moving in opposite directions, at nearly the same pace of days on market.
Zoom out to the citywide figure and that divergence disappears into an average. Depending on which tracker you check, San Ramon's overall median in 2026 has ranged from roughly $1.3 million to $1.6 million, with most sources showing a year-over-year decline in the mid-single to low-double digits. That single number is real, but it is a blend of a strengthening core and a softening south end, plus whatever is happening in Dougherty Valley, where local market trackers have described Gale Ranch holding near $2 million or more through the first part of 2026 while broader Dougherty Valley pricing pulled back further than the city average. A buyer who prices a home off the citywide median alone is comparing it to a market that does not actually exist anywhere in San Ramon.
The Charge That Never Shows Up in the Sale Price
Underneath that pricing story sits a second, quieter one: a chunk of San Ramon's newer inventory carries a special tax that has nothing to do with the sale price and everything to do with what you pay every year you own the home.
In 2014, the City of San Ramon formed Community Facilities District No. 2014-1 under the state's Mello-Roos Community Facilities Act. It started with a single subdivision, Acre, in what the city calls Tax Zone 1. Since then it has grown to include five additional annexed developments across three tax zones: The Preserve, formerly known as Faria Preserve, in Tax Zone 2; Promenade in Tax Zone 3; and three more projects, 500 Deerwood, Aspenwood, and 2481 Deerwood, all folded into Tax Zone 1. The district exists to fund the roads, parks, and public infrastructure that those newer projects need but that base property tax revenue, capped by Proposition 13, was never going to cover on its own.
That is not a hypothetical funding gap. Back in 2013, when the San Ramon Planning Commission was reviewing a proposed 48-unit townhouse project, the city ran an independent fiscal analysis required under a 2011 General Plan policy that mandates evaluating whether new development pays for its own share of city services. The analysis found the project would run a negative fiscal impact of roughly $500 per home, per year, once you accounted for what the city would spend serving those homes against what they would generate in tax revenue. The special tax exists to close that gap.
That structure was tested in court. The Building Industry Association of the Bay Area challenged the district on several grounds, arguing among other things that the city was using a special-purpose taxing tool to fund what was really general city revenue. In October 2016, a California Court of Appeal rejected every argument the BIA made, and both the California Supreme Court and the U.S. Supreme Court declined to review the decision. The tax stood. For San Ramon buyers today, that means CFD No. 2014-1 is not a temporary or contested charge. It is a settled, court-tested part of what some homes in this city cost to own.
Statewide, Mello-Roos charges in Bay Area developments typically run somewhere between $1,500 and $4,000 a year, and industry lending guides note that in CFD-heavy areas the combined effective property tax rate, base tax plus the special assessment, can land between 1.5% and 1.7% of a home's value, compared with 1.1% to 1.3% in areas without one. On a $1.5 million home, that spread is the difference between roughly $16,500 and $25,500 a year in property-tax-adjacent costs before you factor in an HOA. Lenders count the special tax toward your monthly housing expense for debt-to-income purposes, so it does not just affect your budget, it affects what you qualify to borrow in the first place.
The city's own finance records note that CFD No. 2014-1 now spans six separate developments across three tax zones, each annexed at a different point as Dougherty Valley continued to build out. A buyer touring homes in two of those zones on the same afternoon could be looking at two different tax schedules without ever seeing it on the listing sheet.
A Second Assessment Even Longtime Agents Miss
Layered on top of Mello-Roos in parts of Dougherty Valley is a charge most buyers have never heard of at all: the Geologic Hazard Abatement District. San Ramon's GHAD No. 1990-01 is an independent public agency formed to prevent, mitigate, and control geological hazards across roughly 2,767 acres of open space, including the West Branch area near Crow Canyon and Dougherty Roads, Old Ranch Summit, and the Dougherty Valley itself. It is funded through its own annual assessment on properties inside its boundaries, separate from both the base property tax and any Mello-Roos charge.
A GHAD assessment is not an HOA fee and it is not optional once a parcel sits inside the district. It is a public charge tied to the land, and like the Mello-Roos special tax, it will not appear anywhere in a home's listed sale price. It shows up on the county tax bill, and it is the kind of line item that only surfaces when someone actually pulls that bill rather than relying on the Zestimate-style headline number.
What Each Part of San Ramon Actually Looks Like Right Now
| Area | Recent price trend | Pace of sales | Typical tax layer |
|---|---|---|---|
| Central San Ramon | $1.5M median, up 1.3% year over year; price per square foot up 16.6% (three months ending July 2026) | Median 20 days on market | Established tract; generally base property tax only |
| Southern San Ramon | $1.3M median, down 10.2% year over year (last month of data, July 2026) | Median 9 days on market | Mixed; some newer parcels carry a Mello-Roos assessment |
| Dougherty Valley (Gale Ranch, Windemere) | Gale Ranch holding near $2M+ through early 2026; Windemere in the high-$1M range as of February 2026, per local market trackers | Generally faster, luxury-segment pace | Mello-Roos CFD, often more than one overlapping district, plus GHAD assessment in parts of the valley |
Why Buyers Keep Paying the Premium Anyway
None of this means Dougherty Valley is a worse buy. It means the extra charge is funding something specific, and for a lot of families, that something is the reason they are looking there in the first place. Dougherty Valley High School ranks 39th out of 2,162 California high schools according to SchoolDigger's most recent state comparison, and it feeds from elementary and middle schools inside the same Mello-Roos and GHAD boundaries that fund the roads, parks, and hazard mitigation those newer neighborhoods depend on. The tax and the amenity are the same transaction, just spread out over decades instead of paid at closing.
That is the trade a buyer is actually making when they choose Gale Ranch or Windemere over Central San Ramon at a similar price point. They are not paying more for the same house. They are paying a different way, over a longer time horizon, for infrastructure and schools that an older, already-built-out neighborhood does not need to keep financing.
What to Check Before You Write an Offer
- Pull the seller's most recent Contra Costa County property tax bill and look for any line labeled Mello-Roos, Special Tax, or CFD, along with a separate GHAD assessment line if the parcel is in Dougherty Valley.
- Ask for the CFD's Rate and Method of Apportionment, the document that spells out how the charge is calculated, whether it escalates annually, and when it ends.
- Confirm with your lender early whether the special tax and any GHAD assessment will be included in your debt-to-income calculation, since that can change your qualifying loan amount before you ever make an offer.
- If the home sits in one of CFD No. 2014-1's annexed zones, such as The Preserve, Promenade, Aspenwood, or the Deerwood parcels, ask specifically which tax zone applies, since the amount can differ by zone within the same district.
- Compare homes on total estimated monthly cost, principal, interest, base tax, any special tax, GHAD assessment, and HOA dues combined, rather than on list price alone.
A Few Questions Worth Asking Before You Tour
Does the Mello-Roos tax in San Ramon ever go away? Some CFDs are tied to bonds that get paid off on a set schedule, at which point the bond-related portion of the tax can end. Others fund ongoing services and continue indefinitely. The only way to know for a specific parcel is to review that district's formation documents.
Does every home in Dougherty Valley carry a GHAD assessment? No. The district's boundaries are specific, covering roughly 2,767 acres that include the West Branch area, Old Ranch Summit, and parts of Dougherty Valley. A parcel just outside those boundaries would not carry the charge even if it is a short walk from one that does.
Is a CFD the same thing as an HOA? No. An HOA is a private association governed by its own covenants, conditions, and restrictions, funding community-specific amenities. A CFD is a public special tax collected on the county tax bill and tied to the land itself. Many Dougherty Valley homes carry both, and they should be budgeted separately.
San Ramon's neighborhoods are not one market wearing different zip codes. They are genuinely different propositions, priced differently, taxed differently, and moving at different speeds this year. If you are comparing homes across Central San Ramon, Southern San Ramon, and Dougherty Valley and want the actual math behind two listings that look identical on paper, Julie Whitmer can pull the tax history and walk through what each one really costs before you write an offer. Schedule a complimentary home strategy call to get the full picture on the specific streets you're considering.