Massachusetts is considering changing state building codes to allow single staircases in multi-family residential buildings up to six stories. Advocates say the change would result in smaller buildings, space savings that could lead to 130,000 new housing units. Before changing the building codes, which currently require two exit stairways, Massachusetts Governor Maura Healey has signed an executive order establishing a technical advisory panel to study potential safety issues. “We’re all about making it easier to build more housing across our state to drive down costs for everyone,” Healey said in a statement. “While the double-stair requirement plays an important role in ensuring safety, it’s also holding us back from the type of housing construction we need to meet demand.” …New York City and Seattle, Washington have “permitted single-stair buildings up to six stories for decades,” the administration says…, as have the states of Tennessee, Montana, and Connecticut.