Housing Supply Gap

Housing supply gap measures the shortage of homes relative to demand. Calculation: estimate household formation (new households created annually by demographic changes, immigration, family formation), subtract new housing units built, revealing annual shortfall. Cumulative supply gaps (years of under-building relative to household formation) create increasingly tight markets. U.S. faces significant supply gaps in many markets: household formation (new households) growing faster than new housing. Supply gaps drive up prices, increase rents, create affordability crisis. Supply gaps can only be filled by: increased construction (addressing zoning barriers, labor/materials costs), reduced household formation (migration out of area, lower birth rates), or recession reducing new household formation. Recognizing supply gap magnitude helps: large gaps indicate structural under-supply requiring policy change; small gaps indicate short-term tightness. Investment implication: properties in supply-gap markets face strong fundamental demand supporting appreciation. Supply gaps are difficult to reverse quickly (construction takes years), suggesting sustained upward price pressure.