The Republican tax law "isn't a positive" for housing because it "secretly" removed a subsidy for homeownership, top housing analyst Stephen Kim told CNBC on Wednesday.
While the cutting of the mortgage interest deduction to $750,000 from $1 million received a lot of attention, the nearly doubling of the standard deduction will also hit the housing market, he said.
"The vast majority of people who are currently itemizing their taxes will not do so anymore because they won't need to," the Evercore ISI analyst said in an interview with "Power Lunch."
"If you don't itemize your taxes, you don't qualify for the mortgage interest deduction, period. So this is sort of a backdoor way of removing a subsidy for housing that we've seen in this country for almost a century."
Because of those changes, he prefers stocks of building products makers over the homebuilders.
"They are a little bit more exposed to renovation and other international and commercial markets," said Kim, who ranked No. 1 in Institutional Investor's 2017 All-America research team for homebuilding and building products.
That run-up is another reason Kim believes there is more value in building products stocks.
"The valuations for the homebuilders have reached levels that are far beyond anything we've ever seen given the fundamental backdrop," he said. "Frankly, 2017 was a power move largely driven by multiple expansion. The actual estimates for the homebuilders didn't rise really that much from the beginning of the year to the end of the year."