What you Need to Know before installing a New Sink

Are you looking to spruce up your bathroom or kitchen with a new sink? This exciting project can easily turn into a nightmare if you’re unprepared for the plumbing and installation issues you may encounter along the way. Here’s what you need to know before installing a new sink:

1. Getting a sink that fits the existing countertop opening is easiest.

Measuring all four sides of the opening is important to make sure that your new sink covers it.


If the new sink is too small, it leaves gaps along the sides. It may even fall right through. However, if it’s bigger than the opening, you’ll have to enlarge the hole. This task may be difficult for the average DIY-er.

2. Choosing the right sealant matters.

We recommend against using Plumber’s putty, although it’s been the standard for so long. It may crack as the clay dries out with time, causing leaks.


Pure, 100 % silicone sealants work better for undermount sink installations, thanks to their good adhesive properties. They’re also designed for resilient flexibility.


Unlike Plumber’s putty, silicone sealants won’t fail quickly.

3. Install the new faucet before installing the sink.

Many newbies tend to install the sink first before installing the faucet. To save you the hassle, mount the faucet to the sink first, along with all its accessories. The mounting nuts will be more accessible.


To ensure a proper seal, mount the faucet with silicone. This keeps the faucet from moving around in case the nuts loosen.

4. Different sinks have a different number of holes for the faucet and its accessories

If you’re using a single-handle faucet, a sink with one hole works fine. But it’s impossible to add another hole if your sink has too few holes.


We suggest choosing the faucet and its accessories first, then buying a sink with matching holes.

5. Remove old caulk so the new sink sits properly.

New caulk doesn’t stick to the old one, so it’s important to completely remove the old caulk first. It will keep moisture from seeping into areas where you don’t want it.

6. Flush the supply lines to clear any sediment

Plumbing work may release sediment in the pipes. This may clog your new faucet, so it’s important to flush it before attaching the lines to the faucet.

7. Have all materials and tools ready before you begin working to avoid last-minute shopping trips.

You’ll need screwdrivers, wrenches, safety glasses, silicone caulk, and a whole lot more for this project. Getting everything ready can save you time.

Let our plumber help you install a new sink today

We love helping homeowners give their bathroom or kitchen a new look. When a Good Guy installs your new sink, you can rest assured the job is done properly and completed as quickly as possible. If you don’t want to leave anything to chance, CONTACT US!


We’re also available for other plumbing installation, maintenance, repair, and replacement services. Booking an appointment online is simple and easy, and even more convenient if you download our app.




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