If you have been wondering why so few homes are for sale right now, the short answer is something agents and lenders call the lock-in effect. It describes what happens when homeowners who locked in a very low mortgage rate years ago are reluctant to sell, because buying their next home would mean trading that rate for one roughly a point and a half higher. In California, that reluctance is not an edge case: it is the majority of the market. This article explains the numbers behind the lock-in effect, what it means if you are buying or selling in the Pasadena and San Gabriel Valley area, and how to think about your next move in a market like this one. It comes to you from Alejandro Espitia, Broker Associate and REALTOR with Apex Realty and Investments, California license 01213999, licensed in California since 1996, with 200+ homes sold across Los Angeles, San Bernardino, San Gabriel, and Riverside, in English and Spanish.
What is the lock-in effect?
The lock-in effect is simple to describe and hard to unwind. During the pandemic years and the early 2020s, mortgage rates were extraordinarily low, and millions of homeowners bought or refinanced at rates around 3% to 4%. Today those same owners sit on monthly payments they will never see again. If they sell, they would have to finance their next home at today's rate, and the difference can run into hundreds of dollars a month for a comparable house. So they stay put, they remodel instead of move, and the homes they might have listed never come to market. Fewer listings is a big part of why the supply of homes for sale feels so thin.
The numbers behind the lock-in effect
Every figure in this article comes from a public source and is labeled with that source and its as-of date, exactly as published. These four numbers are the backbone of the whole story.
The lock-in effect by the numbers
| Metric | Figure | Source |
|---|---|---|
| 30-year fixed mortgage rate | 7.40%, the highest since late 2023, up from 6.27% a year earlier | Freddie Mac Primary Mortgage Market Survey, week of October 15, 2026 |
| Share of California homeowners with a mortgage rate below 5% | Roughly 76% | California housing market forecast, October 2026 |
| California statewide median single-family home price | $901,420 | California Association of Realtors, August 2026 |
| California for-sale inventory | About 3.7 months of supply, up from recent lows but still tight | California Association of Realtors data, August 2026 |
All four figures come from the public sources named above, as of the dates shown, and are reproduced without alteration. Market data moves month to month, so the as-of dates are part of the story.
Why the mortgage rate matters this much
The two numbers that do the heavy lifting are the mortgage rate and the share of owners holding a low one. At 7.40%, the 30-year fixed rate sits at its highest since late 2023, up from 6.27% a year earlier, according to the Freddie Mac Primary Mortgage Market Survey for the week of October 15, 2026. Against that backdrop, an estimated 76% of California homeowners hold a mortgage rate below 5%, per the California housing market forecast published in October 2026. When the overwhelming majority of owners pay far less than the going rate, the cost of trading up becomes steep, and that is exactly the math the lock-in effect is built on.
A market with real prices and tight supply
The price and supply figures set the stage for what buyers are actually facing. California's statewide median single-family home price was $901,420 in August 2026, per the California Association of Realtors. For-sale inventory stood at about 3.7 months of supply, also per C.A.R. data for August 2026, up from recent lows but still tight by any historical measure. In practical terms, buyers are not fighting the frenzy of the boom years, but they are shopping in a market where homes are expensive and the pickings are relatively slim.
What the lock-in effect means for buyers
- Less bidding-war chaos than the boom years, but not a buyer's market: homes that are priced well and presented well still sell on time.
- Higher monthly payments are the real story. At 7.40%, the payment on a median-priced California home is a serious number, so the loan structure you choose matters as much as the price you negotiate.
- Getting pre-qualified early, and then comparing loan structures across lenders, matters more than ever. A small difference in rate or points can be worth thousands over the life of the loan.
- Be ready to act when the right home appears. In a market with roughly 3.7 months of supply, the well-priced homes do not sit.
What the lock-in effect means for sellers
For sellers, the lock-in effect cuts both ways. The good news is that well-priced homes still attract strong offers, because qualified buyers are out there and supply is limited. The harder truth is that the days of list it and it flies are gone. Pricing right the first time is now essential: overprice, and a home can sit and lose the momentum that the first couple of weeks bring. A realistic list price, honest condition, and a smart agent matter more than market timing.
What this means in Pasadena and the San Gabriel Valley
The lock-in effect plays out street by street, and the Pasadena and San Gabriel Valley market has its own flavor of it. Every neighborhood carries its own mix of long-term owners, some with very low rates, some with none, and the inventory picture changes block to block. The statewide numbers are the frame; your actual choices come down to the specific homes, prices, and loan options in front of you right now. That is where a personalized look beats any forecast.
If you are weighing a move, bring your situation to a real conversation. Call or text Alejandro at 626-314-9170, or use the form below, for a personalized look at how the lock-in effect, today's rates, and current inventory play out for the homes you are actually considering, in English or Spanish.
Read next
Related guides on this site
All figures in this article come from the public sources named above, with their as-of dates, and have not been altered. They were current at publication and can change month to month. This article is for general information and is not mortgage, legal, or tax advice.
This guide is for general information, and is not mortgage, legal, or tax advice. Loan products and rates vary by lender, and all terms come from the lender, never from this website.
