For designer Sandra Nunnerley, New Zealand native and New York transplant, a home’s interiors should always be site-specific. Such is the case for all of her projects—ranging from ultramodern high-rises in Hong Kong to Shingle-style cottages in the Hamptons—but especially so for a ski chalet in Aspen that seamlessly hits the sweet spot between comfortable and luxurious. Although most of the design is her own, she refuses to take full credit for all of the chalet’s alpine-friendly details: “I actually inherited the project from [Ancram, New York–based architect] Alan Wanzenberg.” Shortly after signing the deed, the original owners abruptly decided to sell, leaving the project mostly unfinished and up for grabs. Enter the current buyers, a couple (with four extremely athletic adult children), who wasted no time bringing on Nunnerly—their longtime, trusted interior designer—to create a rustic yet contemporary ski home.