Trump has refused to sign landmark housing legislation.

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YIMBYs and the abundance movement are set to notch a big national victory, as long as President Donald Trump signs a landmark piece of legislation.The House and Senate overwhelmingly passed the 21st Century ROAD to Housing Act this week, a 374-page document with sweeping changes to America's housing policies for the next few decades. Largely, the bill makes it easier and cheaper to build new homes, prevents major corporations from swallowing supply, and supports communities most affected by the climate crisis.Championed by Democrats and Republicans alike, it would be a rare bipartisan win ahead of midterms and would build on headline-making affordable housing successes in cities like Austin, Minneapolis, and New York.The bill hit a stumbling block Wednesday morning after Trump indicated he may not sign it into law."Today's Housing News Conference and Signing is hereby cancelled until such time as we pass the desperately needed SAVE AMERICA ACT, which I consider to be a National Emergency," he posted Wednesday on Truth Social.Business Insider spoke with economists and real estate analysts for their biggest takeaways on what the bill would mean for you should it finally become law.Pushing down the cost of housing supply with looser building regulationsA central driver of America's housing problem is supply. There are millions of lower- and middle-income households looking to rent and buy, but not enough affordable places to live. It leaves public housing wait lists overflowing, and expensive homes across the country sitting vacant.