Why Zillow's Growth Outpaces a Housing Market in Stasis

More sellers than buyers has become the defining feature of the American housing market. Redfin, an online real estate brokerage, estimates that for the seventh straight month there were roughly 50% more sellers than buyers across the United States — a gap of about 630,000 participants, the widest on record since Redfin began tracking the data in 2013. In places such as Austin, Texas, sellers outnumbered buyers by 128%.

The headline suggests catastrophe. A surplus of sellers usually means falling prices, eroded equity, distressed transactions. That would be bad news for real estate platforms whose revenues are tied to home-sale volume. Yet Zillow, the dominant consumer portal for American housing, has grown total revenue by 18% in each of its latest two quarters. The company's Q2 2026 top line of $772 million was 18% above the prior year, with an adjusted EBITDA margin of 23%. Shares trade at a forward price-to-earnings ratio of about 11, a valuation that implies the market expects that growth to stall.

The disconnect between a historically unbalanced housing market and a company growing faster than the industry lies in what the seller surplus actually means for people's behaviour.

The trouble is that a surplus of sellers is not the same thing as a flood of transactions. Many of those sellers sit on the sidelines, locked in by mortgage rates far below today's. The effective rate on outstanding home loans was 4.33% in mid-2026, while the average 30-year fixed rate has climbed to nearly 7% — a 15-month high, driven by stubborn inflation, Middle East supply shocks, and investor anxiety about the federal deficit. For every percentage-point gap between a homeowner's existing rate and current market rates, the probability of selling falls by roughly 18%, according to research cited by industry analysts. More than 80% of current homeowners carry mortgages below 6%. They are not listing because they cannot afford to buy elsewhere.

So the record seller surplus is partly a phantom. It counts people who would sell in a normal rate environment but cannot do so now without trading a cheap mortgage for an expensive one. The number of actual home sales reflects this constraint. Existing-home sales in July 2026 came in at an annualised rate of 4.06 million units, down 1.7% from June. J.P. Morgan forecasts home prices to remain flat in 2026, rising only 3% in 2027. The housing market, in Redfin's phrasing, is undergoing "a long, slow reset."

Zillow is growing because the reset benefits parts of its business that the seller headline obscures. When people cannot buy homes, they continue to rent. The share of first-time homebuyers fell to a record low of 21% in 2025; nearly three in five renters say they plan to keep renting this year. About 37% of renters told Zillow they would not buy even if rates dropped, down from 45% a year earlier. Renting has become a deliberate choice for many, not merely a holding pattern.

Zillow's Rentals segment revenue grew 31% to $209 million in Q2 2026, driven by a 42% increase in multifamily revenue. The platform now hosts 76,000 multifamily properties, up from 55,000 a year earlier. Rentals now account for nearly 27% of Zillow's total revenue, up from roughly 21% a year ago. The company is quietly shifting its revenue mix from transactions to the monthly recurring economics of rental listings and management.

The For Sale segment, where Zillow earns fees from real estate agents and lenders, grew only 14% in Q2 — with its Residential advertising component rising just 7%. This is the part of the business most directly exposed to the seller surplus and sluggish transaction volume. It is also the segment that generated most of Zillow's profit during its 2020-2021 boom. Growth of 7% against an industry backdrop of flat to modestly rising home prices reflects what should be expected when fewer homes change hands.

A second growth engine is Zillow's mortgage arm. Revenue from mortgage originations surged 75% to $84 million, with purchase-loan volume up 95% to $2.2 billion. This growth is partly counterintuitive: higher mortgage rates typically suppress purchase activity. But Zillow is capturing a larger share of a smaller pie, as its captive lender benefits from rate buydowns — builder incentives where the builder subsidises the buyer's interest rate — that funnel borrowers into Zillow's financing pipeline. In Q2, purchase-loan origination volume was up 95% even as industry-wide purchase origination volume was flat or declining.

None of this growth comes without margin trade-offs. Zillow's gross margin contracted by two percentage points to 73% in Q2, and its adjusted EBITDA margin narrowed from 24% to 23%. The Rental and Mortgage segments, while growing faster, are less profitable per dollar of revenue than the mature For Sale advertising business. Management is exchanging margin for market share in newer segments. Operating cash flow dropped sharply to $11 million from $87 million a year earlier, even as the company spent $200 million on share buybacks — more than double its adjusted free cash flow of $96 million for the quarter.

The forward picture introduces the real question. Zillow's Q3 revenue guidance of $745 million to $760 million came in below the analyst consensus of roughly $772 million, and management cited declining traffic and leading indicators pointing to a slower second half. Average monthly unique users fell 2% year-over-year to 239 million; quarterly visits dropped 2% to 2.5 billion. The company is growing revenue from a shrinking audience. That is a sign of higher per-user monetisation, but also of diminishing headroom.

To be sure, Zillow remains the dominant consumer destination for housing information in the United States. It is the only large category player to have expanded its real estate audience reach over the past seven quarters, according to Comscore data. Scale confers durability. Agents and property managers who need visibility will pay for it. The question is whether revenue growth of 18% is sustainable once the rental tailwind moderates and the broader housing market normalises.

Congress passed the 21st Century ROAD to Housing Act in July, introducing over 40 supply-side provisions aimed at easing construction and restricting large institutional investors from buying single-family homes. The legislation takes effect on 7 January 2027. If it succeeds in increasing supply and gradually lowering prices, more renters may re-enter the buyer pool. That would strengthen Zillow's For Sale segment but could slow the Rental business if occupancy pressure eases. The bill is a supply-side bet that affordability will improve over years, not quarters.

Zillow is earning revenue today from a housing market that is structurally stuck. People cannot buy, so they rent. The company's revenue mix reflects that reality. The investment case turns on whether this pattern is a multi-year transition or a new equilibrium. If mortgage rates remain in the mid-to-high 6% range, as most forecasters expect through 2026 and 2027, the rental tailwind should persist. If rates fall materially below 6%, the 5.5 million buyers currently on the fence, to use an industry phrase, may come back — and Zillow's growth rate may follow a different path.

The forward P/E of 11 prices in some deceleration. It does not price in a collapse, nor does it assume the 18% revenue growth rate continues indefinitely. The valuation reflects what appears to be the market's best guess: that Zillow has successfully diversified beyond a single dependent on home-sale cycles, but that its fastest-growing segments carry lower margins and face uncertain demand. The evidence supports that read. What remains to be seen is whether the housing reset Redfin describes is long enough to reward the pivot, or whether Zillow has timed its rental expansion to a temporary dislocation.