Authorizes certain counties to opt in to an exemption from state and local sales and use tax on certain building supplies

HB 3236 creates a sales tax exemption for building supplies used in constructing unattached single-family homes within participating counties or municipalities. It directly affects homebuilders and homeowners in jurisdictions that opt into the program, limiting the exemption to purchases under $250,000 per home. To qualify, a county or municipality must pass an ordinance to join the program, and homebuilders must obtain a department of revenue exemption letter confirming eligibility. The exemption applies only to construction of single-family homes, not attached dwellings, and runs from January 1, 2027, through 2031.