Kitchen Sink Installation Cost: Drop-In, Undermount and Apron

Swapping a kitchen sink sounds like a quick afternoon job, and sometimes it is. The average kitchen sink installation cost runs roughly $300 to $1,200 for labor and basic materials, not counting the sink itself. A like-for-like drop-in replacement sits at the low end, while an undermount sink in a new stone countertop or a farmhouse sink that needs cabinet modifications can push the total well past $2,000.

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The biggest factors are the sink style, whether the countertop needs a new or enlarged cutout, who does the work, and how much of the plumbing has to change. If you keep the same size and layout, most of your money goes to the sink and an hour or two of labor. Once you change the footprint, the price climbs quickly because countertop fabrication and cabinet carpentry enter the picture.

Here is how the costs break down so you can budget accurately and know what to ask for in a quote.

Kitchen Sink Installation Cost by Sink Type

Drop-in sinks

Drop-in sinks rest on the countertop with a rim that hides the cutout. They are the easiest and cheapest to replace, especially if the new sink matches the existing hole. Labor is usually 1 to 3 hours. They work with laminate, tile and solid surface counters, which makes them the default for budget remodels.

Undermount sinks

Undermount sinks attach to the underside of a stone or solid surface countertop, giving a clean edge that lets you wipe crumbs straight into the basin. Installation requires clips or brackets epoxied to the underside of the countertop and a precise, polished cutout. Replacing an undermount sink without damaging the counter is more delicate work, and it often takes a fabricator to cut the old sealant, support the new sink and reseal it. Expect higher labor costs than for a drop-in.

Farmhouse sinks

Farmhouse sink installation cost is the highest of the three because the sink sits in a cabinet cut out to show the apron front. You may need a dedicated apron-front sink base, or a carpenter to cut down the face frame of your existing cabinet and build internal supports for a heavy fireclay or cast iron sink. The countertop almost always needs to be recut or replaced to fit around the apron. Cabinet modification alone can add $200 to $800.

Labor: Plumber vs Handyman vs Contractor

Who you hire has a big impact on the bill.

• Handyman: Often charges $50 to $100 per hour and can handle simple drop-in swaps that reuse existing plumbing connections. Check local rules; some areas require a licensed plumber for any plumbing work.
• Licensed plumber: Typically charges $75 to $150 per hour or a flat rate of $200 to $600 for a standard sink swap. Plumbers handle drain changes, venting, new shutoff valves and code compliance.
• Countertop fabricator: Needed for undermount mounting, enlarged cutouts and new stone counters.
• General contractor: Coordinates the plumber, fabricator and carpenter for farmhouse or full kitchen projects, usually adding a markup of 10 to 20 percent.

Many plumbers charge a minimum service fee or a trip charge, so bundling jobs, such as replacing the faucet, disposal and shutoff valves at the same time, can save money compared with separate visits.

Countertop Cutout and Fabrication Fees

If your new sink does not match the existing opening, the countertop will need work:

• Laminate cutout: Relatively inexpensive, but you cannot shrink a cutout. A smaller sink needs a new counter.
• Stone or quartz cutout for undermount: Fabricators often charge $150 to $500 for a polished cutout, more for enlarging an existing one in place.
• Faucet holes: Drilling new holes in stone typically adds $25 to $75 each.
• Countertop replacement: If the counter must be replaced to fit the new sink, your project becomes a countertop job with costs that can run into the thousands.

Cutting stone produces crystalline silica dust. Fabricators should cut wet, and if any cutting happens on site, ventilate, wear an N95 or better respirator and clean up with a HEPA vacuum.

Plumbing Extras That Add to the Bill

Costs to replace a kitchen sink often grow once the old cabinet is opened. Common extras include:

• New faucet: $100 to $500 for the fixture plus $100 to $250 in labor if installed separately.
• Shutoff valves: Old multi-turn valves often fail; replacing them adds $75 to $200 each.
• Supply lines and drain parts: Braided supply lines, a new P-trap and tailpieces usually add $30 to $100 in parts.
• Garbage disposal: $100 to $400 for the unit plus labor to install or reconnect.
• Dishwasher connection: Reconnecting a drain hose and air gap or high loop is usually minor.
• Drain relocation: Moving the drain for a deeper sink or different bowl layout can add $200 to $800, more if walls must be opened.
• Water damage repair: Rotted cabinet floors or subfloor under a leaky old sink can add several hundred dollars.

A disposal or instant hot water dispenser needs power under the sink. If there is no existing outlet, a licensed electrician should add one; kitchen outlets need GFCI protection under current codes.

DIY Replacement Steps for a Drop-In Sink

A handy homeowner can often replace a drop-in sink with the same cutout. The typical sequence:

1. Shut off the water at the valves under the sink and open the faucet to relieve pressure.
2. Turn off the breaker for the disposal and confirm power is off with a non-contact voltage tester before disconnecting it.
3. Disconnect the supply lines, drain and dishwasher hose. Keep a bucket and towels handy.
4. Remove the clips under the counter and cut the old caulk with a utility knife.
5. Lift out the old sink and clean the countertop surface.
6. Test-fit the new sink, install the faucet and strainer on it while it is out of the counter.
7. Apply sealant around the rim, set the sink, and tighten the clips.
8. Reconnect plumbing and check for leaks with the water on, including running a full basin down the drain.

Undermount and farmhouse installations involve heavier lifting, adhesive mounting and cabinet carpentry, so most homeowners hire them out.

Before starting any DIY swap, look closely at the cabinet floor for soft spots, dark stains or a musty smell. Those are signs of a long-running slow leak, and it is far cheaper to replace a rotted cabinet bottom while the sink is out than after the new one is sealed in place. Take photos of the existing drain and supply connections before disconnecting anything; they make reassembly faster and help you explain the setup to a plumber if you get stuck. Finally, check the sink manufacturer’s instructions for the required cabinet width and clip spacing, because a sink that is even half an inch too wide for the base will not seat properly.

Ways to Save on Your Kitchen Sink Installation Cost

• Choose a sink that matches the existing cutout.
• Schedule the sink change with a countertop replacement so the fabricator handles cutouts at the shop.
• Bundle faucet, valves and disposal into one plumbing visit.
• Buy the sink yourself but confirm the installer will warranty the labor.
• Get at least three written quotes that list labor, parts and any cabinet work separately.

Troubleshooting After Installation

Slow drain. Check the P-trap alignment and make sure the dishwasher hose is not kinked.

Leak at the strainer. Reseat with fresh plumber’s putty or silicone and retighten the locknut.

Sink rim lifting. Clips may be loose or missing; tighten evenly and reseal.

Undermount sink sagging. The adhesive or clips have failed. Support the sink from below immediately and call the fabricator.

When to Call a Licensed Professional

Call a licensed plumber whenever the drain location changes, the venting is questionable, the shutoff valves will not close, or you see signs of leaks inside the wall. Plumbing changes may require permits depending on your jurisdiction. Hire a countertop fabricator for undermount installations and any stone cutting, and a carpenter for farmhouse cabinet modifications. Any new outlet or circuit for a disposal should be installed by a licensed electrician. Getting these trades involved up front keeps your kitchen sink installation cost predictable and protects your cabinets and floors from slow leaks.