So you’re staring at that old, stained kitchen sink thinking it’s time for an upgrade. Or maybe you’re in the middle of a kitchen remodel and the sink installation is your next challenge. Either way, you’re probably wondering if this is something you can actually handle yourself. Let’s walk through exactly how to get this done.
Before you disconnect anything, let’s make sure you have everything on hand. Nothing worse than having your kitchen torn apart and realizing you need to make a hardware store run.
Look, kitchen sink installation isn’t dangerous like electrical work, but there are a few things to keep in mind. First, you’ll be working with water connections, so know where your main water shut-off is, just in case. Most of the time, you’ll just use the shut-off valves under the sink, but if those fail (and old ones sometimes do), you need a backup plan.
Clear everything out from under your sink cabinet. I mean everything. You need room to work, and trust me, you’ll be spending quality time down there. Put down some towels to cushion your back and catch any drips.
If you’re installing a heavier sink like cast iron or composite, get help. These sinks can weigh 50+ pounds, and trying to position them solo while lying on your back is a recipe for disaster.
Alright, let’s get that old sink out of there. This is usually the messiest part, so let’s do it right.
Locate the hot and cold shut-off valves under your sink and turn them clockwise until they stop. Turn on the faucet to release pressure and verify the water is off. No water coming out? Perfect. Still getting water? Your shut-off valves might need replacing (common in older homes), or you’ll need to shut off the main water supply.
Place your bucket under the connections. Using your wrench, disconnect the supply lines from the shut-off valves. Water will drip out. This is normal. Let it drain into your bucket. These connections can be tight, especially if they’re old. If they won’t budge, try some penetrating oil and let it sit for 10 minutes.
This is where things get a bit messy. Loosen the slip nuts connecting your P-trap to the sink drain and wall drain. Have that bucket ready because there’s definitely water in there, and it might not smell great. Once disconnected, remove the entire P-trap assembly. Stuff a rag in the wall drain pipe to prevent sewer gases from coming up.
If you have a drop-in sink, look for clips underneath holding it in place. Unscrew these clips and set them aside (you might reuse them). For undermount sinks, there are usually brackets or clips attached to the underside of the counter. Remove these carefully.
Run a utility knife along the edge where the sink meets the counter to break the caulk seal. This might take some effort if the caulk is old and stubborn.
For drop-in sinks, you should be able to lift it straight up. It might be stuck from years of caulk and grime, so gently work it loose. Undermount sinks need to be supported from below as you remove the last clips. This is definitely a two-person job.
Once out, clean up any old caulk or putty from the countertop using a plastic scraper. Don’t use metal on laminate countertops as it can scratch.
Now, for the fun part; putting in your new sink. The process varies slightly depending on your sink type, but here’s the general approach.
Set your new sink in the opening to make sure it fits properly. It should sit flat with even reveals on all sides. If your new sink is smaller than the old one, you might have a problem. If it’s slightly larger, you might need to trim the opening (laminate only — don’t try this with granite or quartz).
This is so much easier to do now than after the sink is installed. Follow your faucet’s instructions, but generally, you’ll feed the supply lines through the hole, position the faucet, and tighten the mounting nuts from below. Hand-tight plus a quarter turn is usually enough. Don’t overdo it!
For the strainer, roll plumber’s putty into a rope and place it around the drain opening underside. Press the strainer into place from above, then from below add the rubber gasket, cardboard friction ring, and mounting nut. Tighten until the putty squeezes out, then clean the excess.
Run a continuous bead of silicone caulk or plumber’s putty around the countertop opening edge. Don’t skimp here, as a good seal prevents water damage to your cabinet.
Carefully lower the sink into place. Press down evenly to spread the sealant. You should see it squeeze out slightly all around. If your sink came with clips, install them now from below, spacing them evenly. Tighten the clips gradually, alternating sides to ensure even pressure.
Wipe away squeezed-out sealant with a damp cloth. For silicone, you want to do this right away. For plumber’s putty, you can wait until it firms up a bit.
Undermount installation is trickier and varies significantly based on your countertop material. For solid surfaces like granite or quartz, you’ll need special clips and probably professional help for cutting and polishing. But if you’re replacing an existing undermount with the same size, here’s the process:
Install your faucet and strainer while the sink is accessible. Apply a bead of silicone adhesive around the sink rim according to manufacturer instructions.
You’ll need help here. Have someone hold the sink in position from below while you check alignment from above. The sink should be centered and level. Use a 2×4 brace system to hold the sink in place temporarily.
Install the mounting clips according to your countertop type. For stone counters, these usually involve brackets that attach to threaded posts epoxied into the stone. For wood or laminate, you might use clips that screw into the underside. Follow your specific sink’s instructions carefully.
Keep the support braces in place for at least 24 hours while the adhesive cures. Don’t connect plumbing yet. Let everything set properly.
With your sink securely mounted, it’s time to get the water flowing again.
Connect your P-trap to the sink drain tailpiece. Use slip-joint washers at each connection and hand-tighten the nuts. Then give them another quarter turn with pliers. Don’t overtighten as you can crack the plastic. Align everything so water flows smoothly toward the wall drain.
Remove the rag from the wall drain and connect the P-trap. Make sure all connections are secure but not overtightened.
If your old supply lines looked crusty or are more than 10 years old, replace them. New braided stainless steel lines cost about $10 each and give you peace of mind. Connect them to your shut-off valves first (use Teflon tape on the threads), then to your faucet connections. Again, hand-tight plus a quarter turn is plenty.
Remove the aerator from your faucet (debris might come through the lines initially). Turn on the shut-off valves slowly. Check all connections for leaks. Turn on the faucet and let it run for a minute. Check under the sink again. Sometimes leaks only show up under pressure.
Look particularly at the strainer connection and P-trap joints. If you see any drips, tighten the connection slightly. Still leaking? You might need to reseat the connection with fresh putty or tape.
Fill the sink with water and then drain it, watching for leaks at the strainer and drain connections. Run the garbage disposal if you have one. Make sure both hot and cold water work properly. Check that the sink doesn’t move or shift when you press on it.
Since you’re often doing both at once, let’s cover faucet installation specifically. Even if you’re keeping your old sink, a new faucet can transform your kitchen.
Preparing for faucet installation starts with choosing the right faucet for your sink configuration. Count your holes, most sinks have 1, 3, or 4 holes. You can use fewer holes than you have (cover extras with deck plates or soap dispensers), but you can’t use more without drilling.
Removing the old faucet follows the same initial steps as sink removal — turn off water, disconnect supply lines. Then loosen the mounting nuts holding the faucet to the sink. These can be incredibly stubborn after years of corrosion. A basin wrench is worth its weight in gold here, letting you reach those nuts in tight spaces. Sometimes you need to cut old supply lines to get access.
Installing the new faucet is easier on a new sink, but here’s the process either way: Clean the mounting surface thoroughly. If you have a gasket, place it on the sink. If not, use plumber’s putty. Feed the faucet lines through the appropriate holes. From below, thread on the mounting hardware. Center the faucet and tighten evenly.
For pull-down spray faucets, connect the spray hose to the faucet body (usually a quick-connect fitting). Make sure the weight is properly positioned on the hose so it retracts smoothly. Connect your supply lines, using Teflon tape on threads.
The key to a good faucet installation is taking your time with the mounting. A wobbly faucet will loosen over time and cause leaks. Make sure it’s centered, straight, and firmly mounted before connecting water lines.
If you’re installing a sink in a brand new countertop or doing a full remodel, the process has some additional considerations.
First, you need to cut the opening (unless you bought a custom counter with pre-cut holes). For laminate countertops, use the template that came with your sink. Tape it in position, ensuring it’s square to the cabinet face and centered. Drill starter holes in the corners, then cut with a jigsaw using a fine-tooth blade. Go slow to prevent chipping.
For butcher block or wood counters, the process is similar but seal all cut edges with polyurethane to prevent water damage. Multiple coats are better than one thick coat.
Stone countertops (granite, quartz, marble) require professional cutting with specialized tools. Don’t attempt this yourself unless you have experience and proper equipment. The cost of ruining a granite slab far exceeds professional installation fees.
New installations also mean you’re likely running new drain lines. Make sure your drain alignment matches your sink position. The drain should connect to your P-trap without excessive angles or strain. If it doesn’t line up, you might need to modify the drain pipe positioning (this usually requires a plumber, especially if you’re not comfortable with pipe work.)
The kitchen cabinets are arguably the costliest (taking about 30% of your total budget) and most important consideration in your kitchen remodel. If you’ll be using your current layout, and simply updating the look of your space, refinishing or painting your cabinets can save you a great deal of money. It’s also something you can likely do yourself with just a bit of homework and preparation. If you’ll be expanding your space or changing the layout, consider a combination of new and existing cabinets. Maybe you’ll be adding a new kitchen island. If so, you may be able to paint or refinish the cabinets around the perimeter of your kitchen and install complementary cabinets for the kitchen island.
The options available for countertops are virtually unlimited. There’s stone, tile, concrete, quartz, marble, butcher block, stainless steel, granite, Formica and Corian just to name the most popular. While not the most expensive part of a kitchen remodel, the countertop can certainly take a bite out of your budget, depending on the material you choose. As with the cabinets, if you’re simply adding a kitchen island, you may be able to keep your existing countertops on t
