HO-3 and HO-5 attach to a completed dwelling. Course-of-construction coverage is a different product.
A standard homeowners policy assumes walls, a roof, and occupancy. A framed shell, materials on site, and a trailer full of windows are outside that contract. If a storm or theft hits during the build, the homeowners carrier will point at the date of occupancy — and decline.
Builders risk (course of construction) is written for that gap. It insures the structure and often the materials against fire, wind, theft, and vandalism until certificate of occupancy. Then you convert to homeowners, on purpose, the same week the permanent mortgage starts.
Do not let the GC tell you their general liability is “the same thing.” GL covers third-party injury from their operations. It does not rebuild your house.