Catherine Koh

Catherine Koh is an economist at NAHB with the Forecasting and Analysis Department where she analyzes housing-related data and trends to produce industry forecasts and analysis. She has worked at the International Monetary Fund and World Bank prior to joining NAHB and focuses on economic and financial research. She has published an IMF Working Paper on migration as well as several IEO background papers. She holds a master’s in applied economics from Johns Hopkins University.

Foundation Types in 2024: Slabs Continue to Rise, Crawl Spaces Decline

In 2024, 73% of new single-family homes started were built on slab foundations, according to NAHB analysis of the U.S. Census Bureau’s Survey of Construction (SOC). Although this was a modest year-over-year increase of 0.6 percentage points, it continues the upward trend in slab adoption, widening the gap between slabs and other foundation types. In…

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Mortgage Applications Tick Up in July as Rates Ease Slightly

Mortgage application activity picked up in July as interest rates eased modestly. The Mortgage Bankers Association’s (MBA) Market Composite Index, which tracks mortgage application volume, rose 2.4% from June on a seasonally adjusted basis. Compared to July 2024, total applications were up 24.5%. The average contract rate for 30-year fixed mortgages edged down by 4…

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Use of Private Water and Sewer Systems in New Single-Family Homes

The share of new single-family homes built with individual septic systems declined slightly in 2024 compared to the previous year, while the share of homes served by private wells remained steady. According to NAHB’s analysis of the Census Bureau’s Survey of Construction (SOC), approximately 16% relied on individual septic systems, and 9% of new single-family…

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