The Yangtze River Delta is a relatively developed area with many detached houses in the suburbs. Such detached houses are usually 1–3 stories high, mostly self-built by local people. Due to the lack of passive design guidance in the design and construction process, these houses’ energy consumption is usually high. At present, residents in the area use air conditioners, fans, and other electrical equipment in their daily lives. This paper takes detached houses in the suburbs of Ningbo as the research objects, through performance simulation and big data mining of a large number of generated samples, and proposes a passive design strategy suitable for the local building form and envelope structure, which can guide local housing construction.