The Vote That's Quietly Splitting Windsor's Housing Market in Two

If you've been watching Windsor listings this year, you've probably noticed something that doesn't add up. Homes on one side of town are selling in under three weeks with prices climbing into the double digits. On the other side, homes are sitting closer to five weeks and prices are actually easing back. Same town. Same school district boundaries in many cases. Same wine country zip code. Two completely different markets.

The instinct is to blame this on lot size, or renovation quality, or which streets happen to be trading this month. Those things matter at the margins. But the real driver goes back to a ballot measure Windsor voters passed in January 1998, one that most people shopping for a home here today have never heard of, and one that determines almost everything about where new supply can land and how much of it there will be.

A Line Drawn by Ballot, Not by Geography

Windsor incorporated in 1993 specifically because the town wanted more control over its own growth. Within five years, voters had approved an urban growth boundary by a 72 percent margin, a line around the town that development cannot cross. It was written to last twenty years. In 2017, Windsor's voters renewed it again, this time for another 22 years, which pushes the boundary out to 2039.

Alongside that boundary sits a second, less-discussed piece of policy: a town growth ordinance that caps new home construction at 150 units per year. Not per neighborhood. Per year, for the whole town.

150 homes a year. That's the entire allotment for new construction in Windsor, a town of roughly 26,000 people, fixed by an ordinance its own voters have chosen to keep on the books through 2039.

That combination, a hard boundary plus an annual cap, doesn't just slow growth. It rations it. And rationed supply behaves differently than free-flowing supply. It doesn't spread evenly to wherever demand happens to be hottest that year. It goes wherever the town's area plans say it's allowed to go, regardless of which side of town buyers are actually competing over.

Where the Trickle Is Allowed to Land

Windsor directs almost all of its permitted growth into three specific corridors: Old Redwood Highway, Shiloh Boulevard, and downtown. Each of these carries a Compact Residential zoning designation that allows 12 to 32 units per acre on lots as small as 3,000 square feet, a density Windsor would never have approved outside these corridors.

Downtown has already absorbed most of what it's going to. The New Urbanist village built around the old train station brought more than 130 condominiums and 50 businesses into the core by 2006, anchored by the five-acre Town Green that opened in 2001. That corridor is largely built out. Which means the pressure now sits on Shiloh Boulevard and Old Redwood Highway, and on whatever handful of projects happen to be working through approval at any given time.

Right now, that handful looks like this:

• Shiloh Village, an 80-acre vision plan on Shiloh Road, includes a four-story building with 76 units of affordable senior housing, an anchor grocery store, and roughly 60,000 square feet of retail and a health clinic, built to LEED Gold standards.
• Cora Creek, a 106-unit apartment community at 8975 Conde Lane, sits inside the SMART rail station's transit zone. The Windsor Planning Commission approved it in April 2025, a grading permit has been issued, and groundbreaking was expected later in 2026. The buildings are planned all-electric on Sonoma Clean Power, with deliberately limited parking because residents are meant to use the train.
• Redwood Glen, a 43-unit affordable housing project at 8550 and 8560 Old Redwood Highway, was approved back in 2022. Entitlements have been extended, but as of mid-2026 construction hadn't started, since affordable housing financing takes longer to assemble than market-rate financing.
• Ross Ranch Estates, a 31-lot subdivision on about 17 acres near Jensen Lane and Vinecrest Road, was approved in 2023. Final maps are in and staff review is ongoing, but ground hasn't broken. Its lots run from 15,000 to 30,000 square feet, the kind of estate-sized parcel that's genuinely hard to find anywhere in this county.

Notice what's missing from that list: ordinary, market-rate, detached single-family homes on standard lots. Almost everything in Windsor's current pipeline is either age-restricted, income-restricted, rental, or transit-oriented. Only Ross Ranch Estates offers anything close to the large, private lot that a move-up buyer is typically shopping for, and it's still sitting in staff review.

The Number That's Actually Diverging

Here's what that pipeline gap looks like when you compare Windsor's two Redfin-tracked submarkets side by side.

Read that table straight and it looks contradictory. East Windsor is selling faster than a year ago but at slightly lower prices. West Windsor is selling dramatically faster and at meaningfully higher prices, on a much smaller pool of transactions. Town-wide, Windsor's overall median sat near $774K as of September 2026, down about 2 percent from both the prior month and the prior year.

None of those three numbers, taken alone, tells you the truth. Together, they describe two mini-markets moving in opposite directions inside the same calendar year, inside the same town, inside the same growth boundary.

Why a 150-Home Cap Makes This Possible

In most markets, this kind of split corrects itself. If one side of town runs hot, builders and sellers respond by pushing more inventory toward it. Windsor can't do that. Permits are rationed for the entire town, and the corridors where those permits are allowed to land are fixed by area plans, not by where buyers happen to be bidding this year.

That's why the composition of the pipeline matters more here than in a typical Sonoma County market. Cora Creek and Redwood Glen add rental and income-restricted units near the Old Redwood Highway and SMART station corridors. Those units don't compete with the resale detached homes driving West Windsor's median higher, so they won't move that number even once they're built. Shiloh Village adds senior housing and retail, also outside the price tier that's currently accelerating.

The one project that could actually touch West Windsor's price tier is Ross Ranch Estates, precisely because it's the only large-lot, market-rate subdivision in the current pipeline. It's also the one still furthest from breaking ground. Until it, or something like it, clears review, the imbalance between Windsor's two sides has no natural release valve. The boundary and the cap don't just limit how much Windsor grows. They decide which price tier gets relief first, and right now the answer is not the one that's under the most pressure.

What This Means If You're Comparing Windsor to the Rest of the County

If you're cross-shopping Windsor against Santa Rosa, Healdsburg, or Petaluma using a single median price, you're comparing a number that's doing something unusual behind the scenes. Windsor's median isn't smoothing out normal market noise. It's averaging two submarkets that are being supplied by policy, not by builders chasing demand.

Practically, that means a few things worth checking before you anchor on any headline figure. Ask which side of town a listing sits on, not just its list price. Ask whether any of the four projects above are near it, and what kind of housing each one actually adds, because a 106-unit rental building a half mile away tells you something very different than a 31-lot estate subdivision would. And if you're selling into the tighter side of this market, recognize that scarcity here isn't temporary noise. It's the intended result of a boundary the town's own voters extended through 2039.

That's the kind of context that doesn't show up on a portal listing, and it's exactly the kind of thing worth talking through before you price a home or make an offer in this town. If you'd like a clearer read on where your street sits inside this pipeline, or you're weighing whether now is the right moment to list on the tighter side of Windsor, reach out to Rhonda Alderman to request your complimentary home valuation. Two decades of watching Sonoma County's town-by-town quirks play out is exactly the kind of detail that belongs in your pricing conversation, not left out of it.

A Few Common Questions

Does the growth boundary mean Windsor will eventually run out of room to build? Not exactly. The boundary limits where growth can happen, not whether it happens at all. Windsor still has approved capacity inside its three designated corridors. What the boundary and the 150-home cap do is control the pace and the location, which is why supply additions show up unevenly rather than all at once.

Will Cora Creek or Redwood Glen bring prices down once they're finished? Probably not for detached, market-rate resale homes. Both are rental or income-restricted projects aimed at a different segment of the market. They add housing stock and ease overall demand pressure on rentals, but they aren't the kind of inventory that competes directly with a single-family home purchase.

Is one side of Windsor a better long-term buy than the other? That depends entirely on what you're trying to buy and hold, and it's the kind of question that benefits from a conversation about the specific street and price tier rather than a general rule. The pipeline detailed here is a good starting point for that conversation, not a substitute for it.