New single-family home size had been falling since 2015 in response to declining affordability conditions. An exception occurred in 2021, when new home size increased as interest rates reached historic lows. However, as mortgage interest rates increased in 2022 and 2023 and affordability worsened, demand shifted back toward smaller homes.
More recent data suggest these trends have stabilized amid modest affordability improvements. According to fourth quarter 2025 data from the Census Quarterly Starts and Completions by Purpose and Design and NAHB analysis, median single-family square floor area was 2,183 square feet, effectively unchanged from the start of the year. Average (mean) square footage for new single-family homes registered at 2,447 square feet, a small increase.
On a one-year moving average basis, the average size of a new single-family home was essentially unchanged at 2,404 square feet, while the median size remained stable at 2,163 square feet.
Home size trends in 2026 are likely to remain relatively flat, reflecting crosswinds from housing affordability constraints and elevated construction costs.