While basements are still commonly built in northern regions with deep frost lines, they are becoming less common in many modern housing developments due to several economic and engineering factors. Constructing a full basement requires expensive heavy excavation equipment, extensive waterproofing, and specialized labor. In regions with high water tables, expansive clay soils, or solid bedrock, building basements is cost-prohibitive, leading builders to favor slab-on-grade foundations or crawl spaces instead.
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