Why California Homeowners Never Leave — And What It Means for Silicon Valley Buyers and Sellers

If you've ever wondered why it feels nearly impossible to find a home in Silicon Valley, a big part of the answer comes down to this: California homeowners simply don't sell. And they have very good reasons not to.

A recent study analyzed homeowner tenure across the country, and the results are striking. The typical U.S. homeowner stays in their home for about 12 years. In California, that number is dramatically higher across the board — and in the Bay Area, it's off the charts. San Jose homeowners hold onto their homes for an average of 18.7 years. San Francisco comes in at 16.5 years. Los Angeles tops the entire country at 20 years, the longest span of any major metro in America. No other state comes close. The median ownership across all metros outside California is just 8.7 years.

So why are Californians so reluctant to move? The answer is largely one word: Proposition 13.

Prop 13: A Great Deal for Homeowners, a Painful Problem for the Market

Passed in 1978, Proposition 13 caps property taxes at 1% of a home's original purchase price and limits annual increases to just 2%, regardless of how much the home's value has actually risen.

Here's what that looks like in practice. Say you bought a home in San Jose for $300,000 in 1995. Under Prop 13, your property taxes today would still be well under $10,000 per year. But if you sold that home — which might now be worth $1.5 million or more — and bought something comparable nearby, you'd be paying property taxes based on the new purchase price. That's potentially $15,000 or more per year, in addition to giving up your low mortgage rate and paying transaction costs on both ends of the deal.

For most longtime California homeowners, the math is simple: staying put is dramatically cheaper than moving.

It's understandable that Californians hold on, because they're financially motivated to do so. But as they also note, it's a serious problem for anyone trying to break into the market.

The Lock-In Effect Is Real — and It's Getting Worse

Prop 13 isn't the only force keeping homeowners in place. The mortgage rate environment of the last few years has added another powerful layer of lock-in. Roughly 80% of California homeowners currently carry a mortgage rate below 5%. Today's rates sit around 6.25% or higher. For a homeowner with a $900,000 mortgage at 3%, moving to a comparable home and taking on a new loan at 6.25% could mean an extra $1,500 to $2,000 per month, every month, for 30 years.

The result? Homeowners who might otherwise be ready to downsize, upsize, or simply change neighborhoods are choosing to stay. And when owners don't sell, inventory stays thin. And when inventory stays thin, prices stay high or go higher.

What This Means if You're Buying in Silicon Valley

The inventory crunch is real, and it's not going away anytime soon. In Silicon Valley especially, the combination of Prop 13 benefits and rate lock-in means that many of the most desirable homes simply never come to market. When they do, competition tends to be fierce.

The California Association of Realtors (C.A.R.) is forecasting active listings to rise about 10% in 2026, which is encouraging, but we're still working from a very low baseline. A 10% increase in limited supply is still limited supply.

For buyers, this means preparation is everything. Getting pre-approved, knowing your target neighborhoods deeply, and working with an agent who can identify opportunities before they hit the open market can make all the difference in a low-inventory environment.

What This Means if You're Selling in Silicon Valley

Here's the flip side: if you are ready and able to sell, you're entering a market where your competition is limited. Motivated buyers are out there, and well-priced, well-presented homes in Silicon Valley continue to attract serious attention.

If you've owned your home for a significant number of years, you've also likely accumulated substantial equity — equity that can work hard for you in the next chapter, whether that's a move within the Bay Area, a different California market, or somewhere else entirely. California's Proposition 19, passed in 2020, also allows eligible homeowners (those 55 and older, severely disabled, or victims of natural disasters) to transfer their Prop 13 tax base to a new home anywhere in the state, which can make a move more financially viable than many people realize.

The Bottom Line

California's tax laws are genuinely great for homeowners — Prop 13 is one of the most powerful financial tools a California homeowner has. But collectively, the incentive to stay put is suppressing supply in a market that already can't build fast enough to meet demand. The result is what Silicon Valley buyers know all too well: a competitive, expensive, low-inventory market that shows no signs of fundamentally changing.

Understanding these dynamics is key to making smart decisions — whether you're buying, selling, or just trying to figure out your next move.