Martha Stewart has a knack for transforming dated rooms into design showpieces. Now she’s undertaking another major renovation: the Hallmark Channel.

Beginning Monday, Stewart will provide eight hours of programming each weekday as part of an ambitious revamp of the Hallmark Channel. After pinning its fortunes on the broad appeal of sentimental made-for-TV movies and reruns of such classic shows as “The Golden Girls” and “Little House on the Prairie,” Hallmark plans to focus on home and lifestyle improvement and cooking shows.