In the last week of February, the average 30-year mortgage rate slipped to 5.98%. It was the first time in four years that a buyer could borrow for under six percent, and for an industry that had spent those four years waiting, it looked like the turn. Two days later the United States and Israel struck Iran. On October 1, Freddie Mac put the same rate at 7.28%.
Nothing about a house in Ohio or Arizona changed in between. What changed was the price of money, and the war moved it. This report follows that chain from the Strait of Hormuz to the kitchen-table arithmetic of a family trying to buy, and on to the companies that sit in the middle of the transaction.
01 / THE SHOCKOil first, then everything priced off it.
The strikes began on February 28. On March 4 Iran closed the Strait of Hormuz, the channel that carries a large share of the world's seaborne oil. Brent crude, which had closed at $72.48 on the day of the first strikes, was above $112 by late March and reached about $126 at its peak in late April.
A two-week ceasefire in April reopened the Strait and gave markets a pause. A tentative agreement in June went further. But after a monthlong lull, Iran fired on its Gulf neighbors on September 2 in retaliation for new US strikes, and the fighting was back. On September 25, with negotiators in New York exploring a phased exit, Brent stood at $103.64 — still about 43% above where it began.
02 / THE CHANNELHow a barrel of oil reaches a mortgage.
Mortgage rates do not follow the Federal Reserve's overnight rate so much as the 10-year Treasury yield, and that yield moves with what investors expect inflation to do. Higher oil feeds directly into fuel, freight and materials, so the war raised those expectations. The 10-year yield, about 3.97% in late February, reached 4.46% by March 27. The 30-year mortgage rate followed, to 6.38% on March 26.
The relationship has been close all year. In late February the mortgage rate sat about two percentage points above the 10-year yield; in June, when news of a tentative deal pushed the yield down to 4.44%, the mortgage rate fell to 6.47% — again roughly two points above it. When the war eased, rates eased within days. When it flared, they rose.
Then the Federal Reserve joined in. On September 16 it raised its benchmark rate by a quarter point, to a range of 3.75% to 4.00%, its first increase since 2023. Chair Kevin Warsh said too many categories of prices were still rising; the committee's statement noted that uncertainty "remains elevated owing, in part, to geopolitical developments." The 30-year mortgage rate, 6.71% on September 3, reached 7.03% on September 24 and 7.28% on October 1, close to its highest level in three years.
On a $360,000 loan, the move from 5.98% to 7.28% adds about $309 to the monthly payment — roughly $3,700 a year, and more than $110,000 over the life of the loan.
Put another way: at the common guideline of spending no more than 28% of gross income on the mortgage payment, the household income needed for that same loan rose from about $92,000 to about $106,000. Many buyers did not lose interest in a home. They lost the ability to qualify for the one they wanted.
03 / THE STRAINA market that froze rather than fell.
The numbers show a market slowing down, not collapsing. Sales of existing homes ran at an annual pace of 3.98 million in August, down 2.0% from July, against a long-run norm of around 5.2 million. Unsold homes rose to 1.62 million, or 4.9 months of supply — the most in more than a decade. Prices have not given way: the median sale price was $429,100, up 1.6% from a year earlier. NAR's chief economist, Lawrence Yun, put it simply: mortgage rates and home sales "move in opposite directions."
Builders are feeling it more sharply. The National Association of Home Builders' confidence index fell to 32 in September, its lowest in a year, with expected sales over the next six months down six points and buyer traffic at 23. Thirty-eight percent of builders cut prices in September, up from 35% in August. In August, housing starts fell 2.6% and permits, which point to construction a few quarters ahead, fell 2.7%.
04 / OPENDOORThe business most exposed to a slow market.
Opendoor (OPEN) buys homes directly from sellers, makes repairs, and resells them. It earns a thin spread on each one, and it pays to hold every house in the meantime — financing, taxes, upkeep. That makes it one of the purest bets on how fast homes sell. When buyers slow down, Opendoor's houses sit longer, cost more to carry, and may have to be cut in price to move.
Its second-quarter results showed both the strain and the bet. Revenue fell 44% from a year earlier to $883 million, and homes sold fell 46% to 2,339. At the same time it bought 4,378 homes, up 149%, leaving 5,459 homes worth $1.85 billion in inventory. The company lost $162 million in the quarter, had $896 million of cash, and carried $1.76 billion of non-recourse debt secured on its homes. It described conditions as "one of the most challenging housing markets in decades."
Then August got worse. On September 10, chief executive Kaz Nejatian said "the last two weeks of August were among the worst we have seen for housing in years," pushed back the company's break-even target by six to eight weeks, and lowered its third-quarter outlook to revenue growth of 10% to 15%, from "at least 20%" in its second-quarter report. "We're making lots of progress," he said, "but rebuilds are bumpy."
The shares closed at $2.41 on October 1, down from $3.85 in late July and roughly half their value at the start of the year. At that price Opendoor is below the $3 floor of the Vance Value Screener, so it does not appear in our nightly ranking.
05 / THE BUILDERSPaying buyers to buy.
Large builders have a tool Opendoor lacks: they can buy down a customer's mortgage rate. Lennar, one of the two biggest, has been doing a great deal of it. In its quarter to August 31 it spent about 12% of the sale price on incentives, its gross margin on homes fell to 15.8% from 17.5% a year earlier, new orders fell 9% and the average sale price slipped 3% to $372,000.
Stuart Miller, Lennar's executive chairman, tied it directly to the war. Rates, he said, "are responding as inflation remains above the Fed's target, driven by geopolitical tension and higher oil prices," and consumer confidence "has declined as rates and affordability have driven more consumers to slow their purchase decision." He also said the underlying shortage of homes still supports demand — a point that matters for any recovery.
06 / DOWN THE CHAINWhat our own screen shows.
The strain shows up in the companies that supply and serve housing, which the Vance Value Screener does rank. On the close of October 1, out of 1,162 companies, every one of these sat in the bottom half, and each had fallen sharply over the past year (measured from twelve months ago to one month ago):
| Company | Rank | Score | 1 year |
|---|---|---|---|
| Builders FirstSource (BLDR) | 593 | 49.5 | −48.2% |
| Lowe's (LOW) | 699 | 46.3 | −20.4% |
| Home Depot (HD) | 721 | 45.7 | −21.1% |
| Louisiana-Pacific (LPX) | 796 | 43.6 | −22.5% |
| CoStar Group (CSGP) | 1,070 | 31.9 | −62.1% |
Builders FirstSource, which supplies lumber and components to homebuilders, is a useful example. The screen finds it fairly cheap — about 14 times operating profit — but it carries net debt of 3.4 times earnings before interest, tax and depreciation, covers its interest only 2.8 times, and its price has nearly halved. Cheap and stressed is exactly what a long housing slowdown produces.
07 / THE RECOVERYWhat it would look like, in order.
This year has already shown how a recovery would unfold, twice: after the April ceasefire, mortgage rates fell within a week, and after the June agreement they fell again. The order is predictable even if the timing is not.
First, a deal that holds. The plan discussed in New York in late September would have Iran reopen the Strait of Hormuz and the United States lift its economic blockade. A credible agreement on those terms is the trigger for everything that follows.
Second, within days: oil and bond yields. Brent would head back toward its pre-war level near $72, inflation expectations would fall, and the 10-year yield would follow. With mortgages running about two points above that yield, a return toward the 4% the 10-year yield started the year at points to mortgage rates near 6% again.
Third, within weeks: buyers return. In June, mortgage applications jumped 10.8% in a single week and pending sales rose. Many people who stepped back this year still want to move. And with nearly five months of supply on the market, they would come back to a market where they have room to negotiate, not a bidding war.
Fourth, over one or two quarters: the companies. For builders, the first sign would be smaller incentives, and margins rebuilding from around 16%. For Opendoor, it would be homes selling faster and costing less to hold. The 4,378 homes it bought in the second quarter were a bet on exactly this. In a firmer market they become revenue; in a weaker one, they become price cuts.
Last: the Federal Reserve. The Fed raised rates in September because inflation stayed high. It would cut only after inflation has clearly come down, which makes it the final step of a recovery, not the first.
History suggests the damage is a pause rather than a permanent loss. When oil rose about 75% in two months around the 1990 Gulf War, existing-home sales fell 4.3% that year — the market stalled, then resumed. What made 2026 different is that rates were already high when the shock arrived.
08 / THE RISKSWhat would keep the strain in place.
The talks are fragile. On September 25 the President rejected a peace proposal from Iran, and the Wall Street Journal reported that he had told aides he anticipates renewed bombing after the November midterms. Houthi attacks on Saudi Arabia remain a threat to supply, and the Fed has shown it is willing to raise rates again if inflation does not ease. A longer war means higher rates for longer, more incentives from builders, and more time for companies like Opendoor to carry homes they would rather sell.
For anyone following this, five numbers will show which way it is going: the price of Brent crude, the 10-year Treasury yield, Freddie Mac's rate every Thursday, the builders' confidence index each month, and Opendoor's next quarterly report.
This report is educational research. It is not a recommendation to buy or sell any security, and nothing in it predicts where any share price will go.
09 / SOURCESWhere the numbers come from.
Mortgage rates: Freddie Mac Primary Mortgage Market Survey, October 1, 2026 and September 3, 2026; June figures and the 10-year yield via the Associated Press; the February low and the 1990 comparison from Inman. War timeline, oil prices and March figures: Economic impact of the 2026 Iran war, Reuters via GV Wire (September 25) and Semafor (September 28). Federal Reserve decision: Kiplinger. Home sales: National Association of Realtors. Builder confidence: NAHB via Trading Economics; housing starts and permits for August from the Census Bureau, as reported. Opendoor: second-quarter 2026 results (SEC filing) and Yahoo Finance, September 10; share prices from StockAnalysis. Lennar: third-quarter 2026 results (SEC filing). Ranks, scores and one-year price changes for BLDR, LOW, HD, LPX and CSGP are from the Vance Value Screener on the close of October 1, 2026. Payment figures are our own arithmetic on a 30-year fixed loan, principal and interest only.