Tariffs imposed by the Trump administration on imported steel and aluminum increased from 25% to 50%, intensifying uncertainty among homebuilders.

That’s about to double. In a proclamation issued Tuesday, Trump confirmed that the U.S. will begin taxing nearly all steel and aluminum imports at 50% after the clock strikes midnight Wednesday. Steel and aluminum from the U.K., meanwhile, will continue to be levied at 25% due to a recent trade deal.

Home builders, car manufacturers and can makers are among those that will see higher prices for materials. Those companies could charge customers more.