DIY costs typically range from $300-$800, primarily for the sink, disposal, and basic plumbing supplies. Hiring a professional can increase the total to $700-$1500+, as you'll also pay for labor, which averages $150-$300 per hour, plus potential permit and old unit disposal fees.

Key cost drivers include the sink's material (e.g., granite composite and cast iron are pricier than stainless steel), the garbage disposal's horsepower and features, and brand reputation. Additionally, complex plumbing configurations, cabinet modifications, and unexpected issues with old connections can increase labor costs.

You'll need to budget for essential plumbing supplies like plumber's putty, silicone caulk, new P-trap components, and possibly shut-off valves. Basic tools such as a pipe wrench, screwdriver, adjustable wrench, and safety glasses are also crucial, and you might need specialized tools like a basin wrench or garbage disposal wrench.

Request detailed, itemized quotes that clearly separate costs for labor, the sink/disposal (if supplied by them), additional materials, permit fees, and disposal of the old units. Compare these line by line and inquire about warranties on their work. Don't hesitate to check references and online reviews for each plumber.