Single-family housing starts, which account for the bulk of homebuilding, dropped 4.3% to a seasonally adjusted annual rate of 841,000 units last month, the Commerce Department said on Thursday.
Single-family homebuilding tumbled 27.3% on a year-on-year basis in January.
Last month, single-family homebuilding plunged in the Northeast and West, with the latter likely depressed by flooding in California.
Single-family building permits dropped 1.8% to a rate of 718,000 units, while those for housing projects with five units or more rose 0.5% to a rate of 563,000 units.
The inventory of single-family housing under construction fell 1.1% to a rate of 752,000 units.