National Folklore Cultural Heritage (NFCH) refers to traditional villages and historic houses that preserve Korea’s indigenous way of life. These sites remain inhabited by residents, making them living heritage spaces. As such, their preservation and use present a complex challenge, requiring a balance between safeguarding their original form and accommodating residents’ contemporary living needs. This study proposes revisions to the Regulation on Installing Basic Living Facilities in NFCH, focusing particularly on issues surrounding water-using spaces such as bathrooms and toilets.