Start with what is under the sink today
Open the cabinet and look. Is there already a disposal, or just a basket strainer and a trap? Is there a plug nearby, or a switch on the wall? Those answers shape the job more than any brand name.
Photograph the setup before you call if you can. A clear photo of the cabinet, the drain and the dishwasher hose lets a plumber give a more useful answer by phone.
Swapping a worn unit for a similar one is usually the simplest case. Adding a disposal where there has never been one is a bigger job because the sink, drain and power may all need changes.
One rule affects whether you need paperwork at all. The state Department of Community Affairs code alert says replacing a fixture with a similar one, with no change to the piping, is ordinary maintenance with no permit or inspection. Adding a new fixture is different, so check with your building department first.
Source: NJ Department of Community Affairs code alert, nj.gov/dca/codes/alerts/pdfs/OM_MW_03052018.pdf
What moves the price
We do not print numbers in a blog post because no single figure fits every kitchen. These are the factors that decide it.
Ask for a written price before work starts, and ask which of these items it includes. We give a clear price before work starts and can talk through likely factors by phone.
If a quote also covers new drain or water connections, remember that according to the New Jersey plumbing board, only licensed master plumbers and authorized contractors may do plumbing work in the state.
Source: NJ Division of Consumer Affairs, State Board of Examiners of Master Plumbers FAQ, njconsumeraffairs.gov/plu/Pages/FAQ.aspx
Planning an install? Call (732) 466-1098 and we will talk through your setup.
(732) 466-1098Common install scenarios compared
This table shows how the job changes with the situation under your sink.
| Situation | What the job involves | What to ask about |
|---|---|---|
| Replace an existing disposal | Remove the old unit, mount the new one, reconnect drain and power | Haul away and mounting parts |
| Add a disposal where none exists | New drain parts, possibly a new outlet or switch | Who handles the electrical work |
| Disposal with a dishwasher | Connect the dishwasher drain, remove the knockout plug | Air gap or high loop setup |
| Old sink or worn trap | Replace the strainer flange or trap while it is open | What else is worth doing now |
Permits and your local office
We have not verified whether a garbage disposal install needs a permit in New Brunswick, and we will not state a rule from memory. Ask the New Brunswick construction code office before work starts whether a permit or inspection applies to your sink.
The answer may differ from town to town, so do the same check if you live in a nearby community like Highland Park or North Brunswick. In North Brunswick the water comes from the township utility, which can answer supply questions.
Source: North Brunswick Township 2022 water quality report
A pre-install checklist for your kitchen
A few safe steps before the visit make the job go smoother.
- Clear out the cabinet below the sink so the plumber has room to work.
- Know where your sink-side outlet or switch is, and do not plug or unplug anything with wet hands.
- Turn off the power to the disposal at the breaker before anyone works on it. A wall switch alone is not enough.
- Never put your hand inside a disposal, even when it seems off. If a unit is stuck, use the hex key slot underneath or call for help.
- Tell the plumber about any slow drains in the kitchen so they can look at the line while they are there.
Power, drains and the dishwasher
Most disposal installs run on a household outlet, either switched or under the sink. If there is no outlet, a licensed electrician may be needed, and that adds time and a separate cost. Ask whether the quote includes electrical work or assumes you already have it.
On the drain side, the unit needs a proper connection to the trap, and the dishwasher drain should rise or loop before it joins. Ask the plumber how they plan to keep dishwasher water from flowing back into the sink.
How the install itself goes
- Power off and clear the areaThe plumber switches off the breaker, empties the cabinet and sets down a work mat.
- Remove the old partsThe old unit and the sink flange come out, and the sink opening is cleaned of old putty.
- Mount the new unitThe flange is sealed, the mounting ring is locked in and the disposal is hung from it.
- Connect drain and dishwasherThe discharge tube joins the trap, and the dishwasher hose is attached with a high loop or air gap.
- Restore power and testPower comes back on, water runs through the unit and every joint is checked for drips.
Questions that make a quote useful
A good quote lists what it covers. Does it include the disposal itself, mounting hardware, the power cord, drain parts and removal of the old unit? If any of those are missing, you may meet them as extras later.
If your drain already runs slowly, ask whether the quote includes clearing it. A new disposal on a partly blocked line will not fix the slow drain, and drain cleaning may be the smarter first step.
For a first-time install, ask about the larger fit-out too. Our plumbing installation service covers new fixtures and connections, which helps if you are redoing the sink at the same time.
Is a new unit worth it or is a repair enough
A disposal that hums but will not spin, or trips its reset button, can sometimes be freed and kept. A unit that leaks from the housing, or is rusted through, is usually done. Age and repair history matter more than the symptom alone.
If you are not sure, ask for the repair option and the replacement option in writing, side by side.
Also think about how you use the kitchen. A busy household that grinds food daily needs a sturdier unit than a single person who rarely uses it, and the quote should reflect that choice honestly.
Frequently asked questions
Same-day appointments are available when schedule permits. Call (732) 466-1098 and we will tell you what is open.
Tell us whether the sink already has a disposal and whether there is a nearby outlet. That lets us say what the visit will involve.
Only if there is no outlet or switch near the sink. Ask the plumber up front whether the quote includes electrical work, because that is the common surprise.
A switched outlet under the sink is the usual setup, but how your kitchen is wired decides the rest.
Sometimes. A stuck or jammed unit can often be freed. A leaking housing or heavy rust usually means the whole unit is at the end of its life.
No. A disposal grinds food but does not clear a blocked line. If your drain is slow now, ask the plumber to look at it before or during the install.
Turn off the breaker first. Then use the hex key slot under the unit, or call a plumber. Never put your hand in the opening.
Once it spins freely, press the reset button and run cold water for a short while to check that it grinds normally.