The Working Families Home Construction Act of 2026 allows two major government-sponsored mortgage companies, Fannie Mae and Freddie Mac, to purchase and securitize construction loans made by banks, credit unions, and housing finance agencies to builders constructing affordable homes for middle-income families. The loans are capped at $100,000 per home and $2.4 million per project, can be used for land acquisition, infrastructure development, and construction costs, and must be sold to families earning between 90 and 130 percent of their area's median income with a requirement that buyers live in the home for at least one year. The bill requires builders to contribute at least 10 percent of project capital and allocates 22 percent of Fannie Mae's and Freddie Mac's new lending capacity to this program, reducing their traditional mortgage purchase allocations from 65 percent to 53 percent and from 35 percent to 25 percent respectively. This legislation aims to increase the supply of affordable housing for working families by directing existing government-backed mortgage infrastructure toward residential construction projects.