The answer to 'supply line installation cost' is that the cost can vary significantly depending on several factors. In general, the typical range for a basic supply line installation by a professional plumber is between $150 to $500. The final cost will depend on the complexity of the job, the materials used, the accessibility of the installation site, and your location.
More complex installations, such as replacing multiple supply lines or working in tight spaces, may cost more. Additionally, the type of supply line (e.g., copper, PEX, or CPVC) can affect the price. It's essential to get local quotes from reputable plumbers to get an accurate estimate for your specific project.