The number of renter households nationwide rose 2.7%, in the third quarter year over year, to a record 45.6 million, according to a report from technology-powered real estate brokerage Redfin. That rate of growth is three times faster than the 0.9% increase in homeowner households, which now total a record 86.9 million. The 2.7% increase — representing 1.18 million additional renter households — was the second fastest pace since 2015, only trailing the first quarter’s 2.8% rate. Renter households have formed faster than homeowner households for the past four quarters as the cost of buying a home rose faster than the cost of renting, the report states. Rentership rates are lower in metros where, historically, it’s been more affordable to buy a home. In Cape Coral, 21.8% of households are renter households — the lowest share among the metros Redfin analyzed. It’s followed by Charleston (23.7%) and Columbia (24.5%), South Carolina; Allentown (27.2%), Pennsylvania; and Detroit (28.2%).