Florida Home Inspector Practice Test

In new-construction homes, what is the minimum pipe size required for the main water supply line?

1. 1 inch

2. 3/4 inch

3. 1/2 inch

4. 2 inches

The correct answer is: 3/4 inch

The minimum pipe size required for the main water supply line in new-construction homes is typically 3/4 inch. This size is often considered the standard to ensure adequate water pressure and flow for the needs of an average household. A 3/4-inch pipe is capable of supplying sufficient water to bathrooms, kitchens, and other fixtures throughout the home without risking pressure drops or shortages during peak usage times. Choosing a pipe that is too small, such as 1/2 inch, can lead to insufficient water supply, especially during high-demand periods when multiple fixtures are being used simultaneously. Conversely, using a larger pipe size, such as 1 inch or 2 inches, may unnecessarily increase material costs and may not lead to significant improvements in flow or pressure for typical residential needs. Therefore, a 3/4-inch main water supply line strikes an appropriate balance between functionality and economy in new construction.