Zillow's 2025 Homeownership Cost Index Reveals a 12 % Surge in Monthly Homeownership Expenses

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  Published in House and Home on Sun, Nov 11th, 2025 by USA Today
      Locale: UNITED STATES

Zillow’s 2025 Homeownership Cost Index: A Deep Dive into the Rising Price of “Home”

In a November 16, 2025 USA Today article, Zillow released its most comprehensive Homeownership Cost Index (HCI) to date, charting how the true cost of owning a home has changed across the United States. The report—available in full on Zillow’s research portal (https://www.zillow.com/research/homeownership-cost-index/)—breaks down the six key components that add up to a homeowner’s monthly outlay: mortgage payments, property taxes, homeowner’s insurance, maintenance, utilities, and a small “miscellaneous” buffer that captures everything else from lawn care to holiday décor. According to Zillow’s Chief Economist, Daniel P. Brown, “The HCI gives buyers a realistic snapshot of what they’ll pay, not just the sticker price.” The new index has already generated buzz among buyers, lenders, and policymakers alike, as it points to a 12‑percent rise in average homeownership costs over the past year—well above the 4‑percent inflation rate.

1. The Numbers: A 12‑Percent Surge

The headline figure is striking: the national average cost of owning a one‑million‑dollar home in 2025 is now $3,650 per month, up from $3,240 in 2024. That jump translates to a 12‑percent increase in the HCI’s composite score. While the mortgage component climbed 9‑percent due to a 1‑percentage‑point rise in average interest rates (see Zillow’s mortgage‑rate‑trend analysis at https://www.zillow.com/research/mortgage-rate-trends/), property taxes and insurance also saw notable gains.

• Mortgage payments rose from $1,560 to $1,700, reflecting the 0.8‑point hike in the 30‑year fixed‑rate mortgage benchmark.
• Property taxes increased by 3.5 % on average, a bump that is especially pronounced in high‑tax states such as New Jersey and Texas.
• Homeowner’s insurance saw a modest 1.2‑percent rise, partially offset by the expansion of “green” and “smart‑home” coverage options that Zillow’s new insurance‑pricing module reports on https://www.zillow.com/research/insurance-pricing/.
• Maintenance climbed 2.8 %—a reflection of both the aging of U.S. homes and the growing popularity of subscription‑based home‑repair services.
• Utilities increased 1.5 % as energy costs hit a new high, with solar‑panel‑enabled homes still lagging behind in cost savings.

2. Regional Disparities: The Big Three and the Smallest

Zillow’s interactive map (accessed via the HCI portal) shows that the cost differential across metros is wider than ever. The most expensive five‑city clusters—New York, San Francisco, Boston, Los Angeles, and Washington, D.C.—show an average cost that is 40‑percent higher than the national average. In contrast, the Midwest’s most affordable clusters, including Indianapolis, Des Moines, and Tulsa, are 30 percent below the national figure. Brown notes that “while the housing price itself is a driver, the cost of maintaining, insuring, and running a home is what really matters for affordability.”

A look at the “Housing Affordability Index” (HUI) juxtaposed with the HCI demonstrates that the HCI has become a more accurate gauge for potential homeowners. Whereas the HUI uses a single 30‑year mortgage payment as a proxy for affordability, the HCI captures the full range of out‑of‑pocket expenses that can tip a buyer from ‘affordable’ to ‘overstretched.’

3. The Methodology: From Data to Dollar

Zillow’s HCI is built on a combination of proprietary data and publicly available sources. Key inputs include:

• Mortgage data from Freddie Mac and Fannie Mae, blended with Zillow’s own loan‑originating database.
• Property‑tax figures sourced from state and local tax‑collection portals (e.g., https://www.zillow.com/research/property-tax-data/).
• Insurance rates derived from Zillow’s partnerships with leading insurers and their public rate filings.
• Maintenance costs estimated through Zillow’s homeowner‑survey data, which tracks typical repair and upgrade expenses.
• Utility costs pulled from the U.S. Energy Information Administration and aggregated by region.

The index weights each component based on the average share of total monthly outlays reported in Zillow’s 2023 survey: mortgage (44 %), taxes (20 %), insurance (11 %), maintenance (9 %), utilities (8 %), and miscellaneous (8 %). Brown explains that “weighting is critical; even small shifts in component costs can have a significant impact on the overall index.”

4. Why It Matters: Impact on Buyers, Lenders, and Policymakers

The HCI offers a new, transparent lens for all stakeholders:

• Homebuyers can now compare the cost of living in two comparable houses in different cities, not just the listing price. Zillow’s “Homeownership Cost Calculator” (embedded in the report) lets users plug in their loan amount and see a month‑by‑month breakdown.
• Mortgage lenders can use the HCI to gauge risk more accurately, especially as they consider lending to buyers in high‑cost areas.
• Local governments may leverage the index to refine property‑tax structures, ensuring that tax rates are commensurate with the true cost of homeownership.
• Housing‑affordability advocates can use the data to push for targeted subsidies or incentive programs—particularly in the most expensive metros.

A surprising takeaway from the report is that the “maintenance” component has grown faster than the others, implying that the age of the housing stock is a larger factor in cost than previously assumed. This has prompted some policymakers in older urban centers to consider incentive programs for modernizing homes to improve energy efficiency and reduce long‑term expenses.

5. Looking Forward: Predictions for 2026 and Beyond

Brown concluded the article with a cautious outlook. “We expect mortgage rates to stabilize or dip modestly in 2026, but property taxes and utilities may rise further, especially in states adopting stricter environmental regulations.” Zillow’s own predictive modeling, which factors in projected interest‑rate trajectories, suggests that the HCI could see another 5‑7 percent increase by the end of 2026 if current policy trends continue.

For now, the 2025 HCI provides a sobering reminder: owning a home is no longer a straightforward “mortgage payment plus property tax” equation. The true cost is a more complex, and often more expensive, equation. Zillow’s new report—and the data that powers it—empowers buyers, lenders, and lawmakers to make decisions based on a fuller picture of what it really means to put down roots in the United States.