Several homebuilding groups say they support most of the massive housing reform bill making its way through Congress but want to see certain provisions including those related to build-to-rent and manufactured homes changed before it advances any further.

The 21st Century ROAD to Housing Act, co-sponsored by Senate Banking Committee Chair Tim Scott (R-SC) and Ranking Member Elizabeth Warren (D-Mass.), aims to boost housing supply and affordability by expanding programs, creating pilot projects and cutting regulatory red tape. If signed into law, it would be the largest legislative housing supply package in decades.

The bill, which passed the Senate earlier this month with overwhelming 89-9 bipartisan support, includes some provisions of an earlier version—the Renewing Opportunity in the American Dream (ROAD) to Housing Act—as well as housing reform legislation that the House passed in February by a whopping 390-9 vote,

But despite the enthusiasm for housing reform by both parties and both chambers, the…