For most new single-family homes in Utah, a 200-amp main panel is the current standard and minimum RainFire Builders specifies for new residential construction. 200A supports all standard residential loads — HVAC, electric appliances, general circuits — plus one EV Level 2 charger. Homes with all-electric heating, multiple EV chargers, large shop equipment, or solar-plus-battery storage may benefit from 400A service or a main panel with a sub-panel. 100A service — common in pre-1990 Utah homes — is insufficient for modern loads and should be upgraded during any significant remodel. RainFire Builders performs a load calculation on every new build to confirm correct sizing.