The answer to 'drain trap installation cost' is that the cost can vary widely depending on several factors. In general, a basic drain trap installation by a professional plumber can range from $150 to $300 or more. The exact cost will depend on the type of drain trap, the complexity of the installation, the materials needed, and your location.
Factors that can influence the cost include the accessibility of the drain, whether any additional plumbing work is required, and the hourly rate of the plumber. DIY installation of a basic drain trap may be possible for some homeowners and could cost $50 to $150 in materials, but it's important to ensure the work is done properly to prevent leaks or other issues.