Supply-chain backlogs are roiling the new home market, upending efforts to accelerate construction, limiting home-buyer choices, and causing some new owners to move into unfinished homes.

Home builders have increased activity in the past year in response to robust home-buying demand and a shortage of homes in the existing-home market. In many cases, the surge in demand in late 2020 and early 2021 overwhelmed builders, forcing many to halt sales in some markets while they caught up.