A disposal swap is a common project for a homeowner with basic tools. It is also the kind of job where the parts you can see are the easy part. Before you decide, check three things: the power, the mounting and drain connection, and the paperwork on the old and new units.

Check the power before anything else

Find the breaker that serves the disposal and switch it off. Mark it so no one turns it back on while you work. Confirm the power is off at the unit with a tester before you touch any wiring. Note whether the unit is hard-wired or uses a plug, because that decides whether you can reuse the connection or need a licensed electrician to change it.

If the circuit, the switch, or the wiring needs changing, that is the point to hire the work out.

Check the mount and the drain

Look at the mounting assembly under the sink. Most disposals fit a standard mount, but some do not. Measure the existing mount and compare it with the new unit's mount type before you buy.

Check the drain connection and the trap. If the new unit's drain outlet sits in a different place, the drain run may need changes, and those changes are often where a simple swap turns into a plumbing job. Check the dishwasher connection too, if one feeds into the disposal, since that knockout may need to be opened or left closed depending on the layout.

Check the paper

Read the warranty on the new unit. Some warranties ask for a licensed installer or a permit, and a self-installed unit may not carry the same terms. Keep the old unit's record in the house file so you can show the install year and the model.

Decide by skill and risk

If the power is confirmed off, the mount matches, the drain is a straight swap, and the warranty does not require a licensed installer, the job sits in the range many homeowners handle. If any of those checks fails, book the visit. A leak under the sink is easier to prevent than to clean up, and that is the reason to stop at the first failed check.

The Garbage Disposal: typical service life and when to plan page gives the planning frame for the unit itself.