If you are planning a build and you have typed "commercial construction cost per square foot" into a search bar, you already know the annoying part. Every source hands you a different number. One says $150. The next says $600. A third throws out $1,200 and walks off like that settled it. So let's be straight with you. In 2026, most commercial projects in the United States land somewhere between $150 and $600 per square foot. Simple structures like warehouses can come in well