Wealthy Americans, largely untouched by the recession and eager for more living space, have been on a homebuying binge.

Demand for million-dollar homes is growing faster than any other price tier in the pandemic-driven U.S. housing boom. In October, applications for mortgages larger than $766,000 jumped 59%, the biggest gain for all segments measured by the Mortgage Bankers Association. By comparison, the increase for mortgages from $150,000 to $300,000 was 13%.