The Nest Weekly — September 21, 2026

Week of September 21, 2026 | From Kaveh Sartipi, Nest Mortgage — Danville, CA

Bay Area Market Read

Last week I told you the rate drift was a nudge, not a regime change.

This week it became one. I want to own that plainly before anything else, because the whole read changed.

On September 16 the Federal Reserve raised its benchmark rate by a quarter point to a target range of 3.75% to 4%, its first increase in three years. Mortgage rates had already moved in anticipation, so the announcement itself was quiet. The week before it was not.

The rate snapshot

Loan type	Week ending Sept 17	Prior week	One year ago
30-year fixed	6.95%	6.76%	6.26%
15-year fixed	6.26%	6.09%	5.41%

Rates as of September 21, 2026 — subject to qualification. Current rates posted at NestMortgage.ai/rates.

Source: Freddie Mac Primary Mortgage Market Survey, national averages. These are survey averages, not quotes, and they are not what any individual borrower is offered. Your actual pricing depends on credit, equity, occupancy, property type, and loan structure. Daily quoted pricing has been running above the weekly survey, and some published daily averages have crossed 7%.

The honest read: this is the largest single-week move in either direction we have seen in months, and the 30-year is now running roughly seven tenths of a point above where it sat a year ago. The drivers are not mysterious. Inflation has been sitting near 3.4% against a 2% target, energy prices have spiked on overseas conflict, and the 10-year Treasury has pushed toward 5%. Mortgage rates track that 10-year far more closely than they track the Fed's own rate.

That last point matters more than the headline. The Fed did not set your mortgage rate this week. The bond market did, and it did most of it before the Fed spoke.

Current rates are published on NestMortgage.ai/rates and update regularly. Subject to qualification.

The part nobody is saying out loud

Here is what I have not seen in anyone else's market email this week.

A rate increase is unambiguously bad news for buyers in a market where sellers have all the leverage. It is a much more complicated thing in a market where they do not.

Bay Area supply is running around 2.2 months region-wide. San Francisco is at roughly 1.2 months, and the city's single-family median is up about 24% year over year to near $1.855 million, with condos up about 22%. In that environment a rate hike takes money out of a buyer's pocket and hands the seller nothing to give back. You simply pay more for the same house.

Now look east. As of early September, Alameda County was carrying roughly 1,600 listed properties averaging about 48 days on market with a median list price near $922,000. Contra Costa was carrying roughly 1,830 listings averaging about 54 days, median list near $751,000, with prices up only about 1% year over year.

A seller sitting at day 48 is a different negotiating partner than a seller sitting at day 8. The rate move raises their risk, not just yours. It thins the buyer pool that can still qualify at their price, and it makes the buyer who is still standing considerably more valuable to them.

In a one-month market, a rate hike is a tax on the buyer. In a fifty-day market, it is leverage the buyer can spend.

That is not a reason to celebrate a higher rate. It is a reason to stop treating this as one regional story. The same quarter point lands very differently on either side of the Caldecott.

Inventory and leverage

One caution on inventory figures, including mine. The listing counts circulating right now come from several different feeds that count actives, pendings, and coming-soon inventory differently. Comparing a number from one source this week against a number from another source last month will produce a swing that is measurement, not market. Months of supply and days on market are the steadier reads, and both of those say the same thing: the city is tight, the East Bay is not.

Where supply has rebuilt, the negotiable items are the ones that matter most right now. Seller credits applied toward a rate buydown. Repairs. Timeline. In a week where financing costs jumped, a credit directed at the rate is frequently worth more to a buyer's monthly payment than the same dollars taken off the purchase price. Sellers with a 54-day listing have a real incentive to participate in that conversation. Sellers with a 1.2-month market behind them do not.

What to do about it

For buyers: Requalify before you do anything else. If you were preapproved in July, your number has moved, and finding that out during an offer is the expensive way to learn it. Then decide which market you are actually in. If you are competing in the city, your edge is being fully underwritten and clean. If you are shopping the East Bay, your edge is asking for a credit toward a buydown and being willing to walk. Those are different strategies and this is not the week to confuse them.

For sellers: Your buyer pool just got smaller at your current price. That is arithmetic, not pessimism. You have three levers: price, credit, or time. In a tight pocket you may not need any of them. At 48 or 54 days on market, pretending it is still spring costs you more every week than the credit would have.

The closing thought: Waiting for rates to come back down has been a losing strategy for most of a year, and this week it got more expensive. That does not mean buy something. It means make the decision on the house, the payment, and your own timeline, rather than on a forecast that has been wrong repeatedly.

Questions about your specific situation, your specific zip code, or what you actually qualify for at today's pricing? Reply to this email or call me directly.

Kaveh Sartipi Mortgage Broker & Advisor, Nest Mortgage 925.718.0700 | Kaveh@MyNestMortgage.com NestMortgage.ai | 100 School Street, Danville, CA 94526

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Kaveh Sartipi | NMLS# 247776 | DRE# 01363588 | Answer Home Loans, Inc. is a Licensed Real Estate Broker, California Department of Real Estate DRE# 02058505 | NMLS# 1729528 | Equal Housing Lender. This is not a commitment to lend. All loans subject to credit approval, underwriting, and program guidelines. Rates and terms subject to change without notice.