Tracking Home Prices: The Case-Shiller Index

The Case-Shiller methodology tracks repeat sales of single-family homes — comparing the sale price of a home today to the price paid the last time that same home sold. This repeat-sales approach controls for differences in property quality that distort median-price statistics. If the median price rises because more expensive homes are selling, that appears as appreciation in median statistics but not in Case-Shiller.

The index family includes a National Home Price Index, a 10-City Composite, a 20-City Composite, and individual metro indices. Data is released monthly with a two-month lag. The base period is January 2000 = 100, meaning an index value of 300 indicates prices have tripled since January 2000. Case-Shiller is best used for tracking broad price trends over time rather than for valuing individual properties.

The Case-Shiller National Index tells a dramatic story. From 1990 to 2000, prices grew steadily at roughly 3-4% annually. From 2000 to the July 2006 peak, prices accelerated sharply, with some metros like Miami, Las Vegas, and Phoenix posting 100%+ gains. The subsequent crash took national prices down approximately 27% peak-to-trough by February 2012.

Recovery began in 2012 and accelerated through the 2020s. By late 2024, the national index exceeded 320, meaning home prices had more than tripled since 2000. The pandemic period (2020-2022) produced the sharpest two-year appreciation in the index's history, driven by record-low interest rates, remote work flexibility, and constrained housing supply.

Case-Shiller is most useful for three analytical purposes. First, comparing appreciation rates across metros identifies markets that are outperforming or underperforming national trends. A metro consistently outperforming may offer continued momentum but also bubble risk. Second, comparing current index values to historical peaks and troughs helps assess where a market stands in its cycle.

Third, the ratio between Case-Shiller price indices and income or rent indices reveals affordability trends. When prices grow much faster than incomes or rents, the market is becoming less affordable and more vulnerable to correction. This price-to-income or price-to-rent divergence was a key warning signal before the 2008 crash and is a metric that disciplined investors monitor continuously.