A crawl space is a narrow, unfinished area beneath a building, typically between the ground and the first floor. It provides access to plumbing, electrical wiring, and insulation, allowing for maintenance and repairs. Crawl spaces are usually ventilated to prevent moisture buildup, which can lead to mold and structural issues. These spaces can vary in height, often requiring a person to crawl to navigate them. While they are common in many homes, especially in regions with high water tables, they can also be a source of pests and humidity problems if not properly managed. Regular inspections are important for maintaining a healthy crawl space.