New garbage disposal. New garbage disposal installation typically costs $250 to $450, including the new unit and removal of the old one. Disposals themselves cost between $50 and $350. There are a number of features available, including power options, noise reduction, anti-jamming and more. Expect to pay more for a disposal with these high-tech aspects. When installing a garbage disposal, choose one with a warranty. Many models include a two-year warranty that covers most damage.