Despite the surge in rates, refinance applications swelled 18%, largely driven by a 22% increase in conventional applications. As a result, the refi share of mortgage activity was up by 2.5% week over week to 57.3% of total applications.

Purchase loan applications also experienced a boost, up by 4% on a seasonally adjusted basis and 12% on an unadjusted basis.

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“Purchase applications also increased in the final full week of January but remained 7% lower than a year ago,” Kan said. “The average purchase loan size hit a new survey high once again at $441,100. Stubbornly low inventory levels and swift home-price growth continue to push average loan sizes higher.”    

The average contract interest rate for 30-year fixed-rate mortgages with jumbo loan balances and loans backed by the FHA increased to 3.59% and 3.86%, respectively. The average contract interest rate for 15-year fixed-rate mortgages increased to 3.01%.