The Lock-In Effect Is Loosening: What Falling Mortgage Rates Mean for San Diego's Housing Supply
For years, San Diego homeowners with 3% pandemic-era rates refused to sell — freezing inventory and squeezing buyers. As rates trend toward 5.9% by end of 2026, that lock-in effect is finally breaking. Here's what it means for both sides of the market.
For years, the single biggest constraint on San Diego's housing supply wasn't zoning or construction — it was mortgage math. The lock-in effect is loosening, and what falling mortgage rates mean for San Diego's housing supply is significant: more listings are coming, and the market dynamic that has defined this region since 2022 is starting to shift.
What the Lock-In Effect Actually Did to San Diego Inventory
The lock-in effect was simple but powerful. Homeowners who locked in 3% rates during the pandemic looked at 7% rates and made a rational decision: stay put. Selling meant trading a payment they could afford for one that was often 40–50% higher on a comparable home. In a market like La Jolla — where median prices already push well past the state average — that math was especially prohibitive. The result was chronically low inventory, sustained price pressure, and buyers competing hard for whatever came to market.
San Diego's undersupply problem was real before the pandemic. The lock-in effect made it structural.
Why 5.9% Changes the Calculation
Fannie Mae projects the average 30-year fixed rate will fall to roughly 5.9% by the end of 2026. That number matters because it meaningfully closes the gap between what locked-in homeowners have and what they'd be taking on if they moved. It doesn't eliminate the trade-off, but it makes it survivable — especially for owners sitting on substantial equity after years of appreciation.
As that gap narrows, pent-up seller decisions start converting into actual listings. Homeowners who've delayed relocating, right-sizing, or cashing out begin to act. The result is a wave of new supply entering a market that has been starved of it. Find out what your home is worth →
San Diego's coastal markets — historically among the most supply-constrained in California — stand to see this play out in real time. The state median price is expected to rise a modest 3.6% to around $905,000 in 2026, but San Diego's coastal submarkets are projected to outperform that average, precisely because demand here remains structurally high.
What This Means For You
• **If you're a buyer:** More listings mean more options and slightly less frantic competition. This doesn't flip into a buyer's market overnight, but the negotiating environment will be more balanced than anything you've seen in several years.
• **If you're a seller:** You'll have more competition from other listings than you've faced recently. Pricing accurately and presenting well matters more now — the days of selling anything at any price are fading. Find out what your home is worth →
• **If you're a homeowner watching the market:** The lock-in effect loosening doesn't mean prices drop — San Diego's chronic undersupply still provides a price floor. It means normalization: steadier appreciation, more transaction volume, a healthier market overall.
• **If you're an investor:** Quality assets in supply-constrained San Diego submarkets remain the play. As inventory rises modestly, the gap between well-maintained properties and the rest will become more visible to buyers.
This is a normalization year, not a correction. Understanding that distinction is what lets you move with the market rather than react to headlines. For deeper context on San Diego's current conditions, explore the Palisade Realty blog for ongoing local updates.
Frequently Asked Questions
How does the lock-in effect impact home prices in San Diego specifically?
As the lock-in effect loosens and more listings enter the market, price growth is expected to moderate — not reverse. San Diego's chronic undersupply still supports values, but the days of extreme low-inventory price spikes should ease as supply and demand come into better balance through 2026.
Will more listings mean it's finally a buyer's market in San Diego?
Not exactly. Increased supply will give buyers more choices and modestly more negotiating room, but San Diego's structural undersupply means demand still exceeds inventory in most submarkets. Think of it as a more balanced market rather than a full shift to buyer's market conditions.
Should I sell now or wait for rates to drop further before listing?
If you've been holding off specifically because of the rate gap, the improving math at 5.9% makes this a reasonable window to reassess. Waiting for rates to fall further means competing with the additional sellers who will also wait — the first wave of new listings often captures the strongest buyer demand. A current market valuation is a good starting point for that decision.