NC and SC Crawl Space Building Code [The Hidden Requirements That Affect Your Home’s Value — Complete R409 Guide for Carolina Homeowners]
⚡ QUICK ANSWER North Carolina and South Carolina both permit closed crawl spaces under their residential building codes — but with specific requirements. NC code under Section R409 of the 2024 NC Residential Code (mandatory July 1, 2025) requires a Class I vapor retarder, sealed foundation vents, mechanical drying, and a 3-inch termite inspection gap….