Here is the math that keeps a lot of San Diego homeowners from listing their house, even when they'd otherwise be ready to move. Sell a $1.5 million home carrying a 3% mortgage and buy a comparable $1.5 million home at today's rate, and the monthly payment goes up by roughly $1,600. Not because the new house costs more. Because the money costs more. That single number is doing more to shape San Diego's housing market right now than any listing photo or open house sign.
It is also why the "median home price" you see quoted on portals and in market recaps is a less useful number than it looks. San Diego's market has split into two distinct behaviors depending on whether the roof is attached to a neighbor's or not, and the blended median hides that split almost completely.
The same county, two different markets
Look at inventory by property type and the divergence is hard to miss. In May 2026, detached single-family inventory across San Diego County was down 24.7% year over year, while attached inventory, meaning condos and townhomes, was up 5.6% over the same period. That is not a one-month blip. Two months earlier, in March 2026, a separate market report showed the same pattern: detached inventory down 21.5% year over year against attached inventory up 3.2%. The direction has held steady across the spring.
Price is following the same split. A county breakdown of February 2026 data, published that March, showed condo and townhome prices down 2.2% year over year even as detached home prices held firm, with condo supply sitting at roughly 2.8 months. Detached homes are scarce and holding value. Attached homes are more available and softening.
Here is where the "median" starts to mislead. The San Diego Association of Realtors' Market Activity Report, current as of early June 2026, put the countywide median sale price for May 2026 at $925,000. Redfin's window covering the three months ending June 2026, focused on the city of San Diego specifically, put the median at $984,000 with a price per square foot of $686 and homes averaging 23 days on market and about three offers each. Both numbers are accurate. They are also measuring different things, one blending detached and attached across the whole county, the other a narrower geography over a different stretch of months. Neither tells you what a specific type of home in a specific price band is actually doing, which is the only question that matters if you're the one shopping.
| Detached (single-family) | Attached (condo/townhome) | |
|---|---|---|
| Inventory, year over year (May 2026) | Down 24.7% | Up 5.6% |
| Inventory, year over year (March 2026) | Down 21.5% | Up 3.2% |
| Price direction (February 2026) | Holding firm | Down 2.2% |
| Months of supply (condo, February 2026) | — | ~2.8 months |
Why an owner won't trade a good rate for a lateral move
The mechanism behind the split has a name real estate economists use constantly this cycle: the lock-in effect. Freddie Mac's Primary Mortgage Market Survey put the 30-year conforming rate at 6.48% as of early June 2026. Anyone who bought or refinanced a detached home in 2020 or 2021, when rates sat below 3%, is now facing a two-to-three point jump in borrowing cost the moment they sell and rebuy. That's the $1,600-a-month math above, and it applies whether the move is a downsize, an upgrade, or a sideways relocation across town. For a huge share of detached owners, there is no financial reason to become a seller unless life forces the issue: a job change, a death, a divorce, a growing family that has genuinely outgrown the house.
Condo and townhome owners face a version of the same math, but the population selling those units skews differently. Investors, empty-nesters converting equity, and owners without as much rate advantage to protect are more willing to list, which is a large part of why attached inventory keeps climbing while detached inventory keeps shrinking. San Diego's 2026 conforming loan limit rose to $1,104,000, the highest ever set for the county, which helps some buyers stretch into detached inventory without tipping into jumbo financing. It does not solve the supply problem, because the properties simply are not coming to market at the rate buyers need.
What this means if you're shopping for a house
If a detached single-family home is the goal, expect the numbers above to translate into real friction at the offer table. Fewer listings means more competition for the ones that do appear, particularly anything move-in ready and reasonably priced. The 23-day average time on market for San Diego proper, per Redfin's spring data, reflects a market where well-prepared buyers still need to move decisively when the right property shows up. Waiting for a broader supply wave to arrive and soften prices assumes sellers will eventually give in to the math. Right now the data says most are not.
The practical response is to treat pre-approval and search criteria as fixed well before you start touring, and to be realistic that the properties matching your budget may require some patience on timing rather than negotiating leverage on price. Detached inventory tightening by roughly a quarter year over year is not a market where buyers currently hold the upper hand.
What this means if you're shopping for a condo or townhome
The attached market is behaving almost like a separate metro. More listings, slightly softer prices, and close to three months of supply on the condo side gives buyers actual room to negotiate on price, contingencies, or closing timeline in a way that detached buyers largely do not have right now. If lifestyle flexibility matters more to you than a private yard, this side of the market currently rewards patience and comparison shopping rather than punishing it.
The luxury tier runs on different rules
Above roughly $2 million, the lock-in effect matters less because financing matters less. Recent 2026 data on San Diego's luxury segment shows 68% of buyers above $2 million paying cash outright, with international buyers making up about 35% of transactions above $3 million and paying cash at an even higher rate, close to 85%. A cash buyer isn't weighing a 3% mortgage against a 6.5% one, so the lock-in dynamic that freezes so much of the detached market barely touches this tier.
That segment also transacts differently in another way. A meaningful share of San Diego's highest-value sales, particularly above $5 million, happen off-market through private, pre-MLS channels rather than public listings, with roughly 40 to 50% of transactions at that level never appearing on the open market at all. That does not mean discount pricing. Off-market sales in this tier typically close at 95 to 100% of what a public listing would command, sometimes more when a seller and buyer are a strong fit. What buyers gain through those channels is access and time, not a markdown.
What to actually watch instead of the headline number
If you are reading San Diego market coverage right now, the single most useful adjustment you can make is to stop asking what the median is doing and start asking what your specific property type is doing. A blended county median can sit flat for months while detached and attached inventory move in opposite directions underneath it, which is exactly what has been happening since at least March 2026. Ask any report, including this one, to break out detached from attached before you draw a conclusion from it.
A few direct questions
Will falling mortgage rates fix the detached shortage? Only partially, and not quickly. Even a meaningful rate drop still leaves most 2020 and 2021 buyers facing a higher payment than they have now, so the lock-in effect eases gradually rather than all at once.
Does a soft condo market mean condos are a bad investment right now? Not necessarily. Softer pricing and more supply can mean more negotiating room for a buyer with a longer time horizon, particularly compared to the tighter, more competitive detached side.
Is the luxury market really that different, or is it just more expensive? It behaves differently at a mechanical level. Cash purchases dominate above $2 million, and off-market sales become common above $5 million, both of which decouple that tier from the rate-driven dynamics shaping the rest of the county.
If you're trying to figure out where your own search or your own listing fits inside this split market, that is exactly the kind of conversation worth having before you make an offer or set a price. Pacific Harmony Realty works with buyers and sellers across San Diego's coastal and North County neighborhoods, and a straightforward look at what's actually happening in your property type and price range beats guessing from a headline number every time. Schedule your free consultation or request a complimentary home valuation when you're ready to talk specifics.
