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Crawl space vapor barrier installation cost varies based on the size of the area, material quality, and labor rates. On average, homeowners can expect to pay between $1,200 and $4,000 for a professional installation. This process involves sealing the crawl space floor and walls with a heavy-duty plastic sheet to prevent moisture buildup, mold growth, and structural damage. Costs may increase if insulation or drainage improvements are needed. Investing in a vapor barrier enhances energy efficiency and protects your home’s foundation. When budgeting, consider the long-term savings on repairs. Crawl space vapor barrier installation cost is worth the protection it provides.