Kitchen Sink Installation: What to Know

When it comes to kitchen renovations, a proper kitchen sink installation can make all the difference. Whether you’re upgrading your existing sink or replacing an old one, getting the job done right ensures your kitchen runs smoothly and looks great. At All Needs Plumbing, we specialise in professional kitchen sink installation for homeowners and businesses across Australia. Here’s everything you need to know about installing or replacing a kitchen sink — and why hiring a pro is your best bet.

Getting Ready for Your Kitchen Sink Installation

First things first, before any work begins, we turn off your water supply to avoid leaks or flooding. This means shutting off both the hot and cold water valves under your sink or at the main water supply if necessary. Next, we disconnect the water lines, drain pipes, and any garbage disposal connected to your current sink. This preparation is crucial because it prevents water damage and ensures a smooth installation process without interruptions.

We always come fully equipped with the right tools and materials — from adjustable wrenches and plumber’s putty to silicone sealant, mounting clips, and a utility knife. Having the proper gear means the job is done efficiently and correctly, saving you time and stress.

Removing Your Old Kitchen Sink

Removing an old sink may seem simple, but it requires care and experience to avoid damaging your countertop or plumbing. We start by placing a bucket under your pipes to catch any residual water that might spill when disconnecting the plumbing. Then, we carefully disconnect the water supply lines, drain pipes, and the garbage disposal, if one is installed.

Using a sharp utility knife, we cut through the old sealant or caulk around the sink rim. This step is crucial because it loosens the sink from the countertop, making removal easier. After loosening any mounting clips or screws underneath, we carefully lift the sink out. Finally, we thoroughly clean the sink cutout area, removing any leftover sealant, grime, or debris. This ensures a clean surface for the new sink to sit on and helps form a watertight seal.

Installing Your New Kitchen Sink

Fitting and Sealing

We begin by test-fitting the new sink into the countertop cutout. This step helps us confirm that the sink fits perfectly without gaps or overhangs. If any minor adjustments are needed, we address them before proceeding.

We put a bead of silicone sealant around the edge of an undermount sink. This creates a waterproof seal between the sink and the underside of the countertop, preventing leaks and water damage. 

Pro-Tip: Silicone alone isn’t enough to hold an undermount sink securely. We always use mounting clips or brackets underneath the countertop to keep your sink firmly in place, ensuring it won’t shift or sag over time.

For drop-in sinks, we apply plumber’s putty or silicone around the edge of the sink rim before lowering it into the cutout. This seals the sink to the countertop, preventing water from seeping underneath.

Connecting Plumbing

Next, we install the drain assembly. We use plumber’s putty around the drain opening to create a watertight seal before tightening the drain flange. Then, we reconnect your water supply lines to the faucet valves, ensuring all connections are tight and leak-free.

We also reconnect the drain pipes and install the P-trap, which is essential to prevent sewer gases from entering your kitchen. If you have a garbage disposal, we will reinstall and connect it properly.

Final Checks

Before wrapping up, we turn your water back on and test all connections for leaks. We run water through the faucet and check the drainage to make sure everything flows smoothly. Once we confirm there are no leaks or issues, we clean up the work area, leaving your kitchen neat and ready to use.

Special Considerations for Your Kitchen Sink Installation

If you have an existing countertop made of granite, timber, or other materials, and want to install a new sink, we can handle that. Sometimes, installing a sink in an existing countertop requires precise cutting or reinforcement of the cabinet, especially for heavy farmhouse sinks. We possess the expertise and tools necessary to complete this task safely and accurately.

Pro-Tip: Always double-check your sink’s dimensions against your countertop cutout before installation. This simple step prevents costly mistakes and delays. If the new sink doesn’t fit the existing cutout, we can advise on options such as resizing the cutout or selecting a different sink model.

FAQs About Kitchen Sink Installation

Is silicone enough to hold an undermount sink in place?

Silicone sealant helps waterproof and partially hold the sink, but it’s not enough on its own. Mounting clips or brackets are essential for a secure, long-lasting fit. Relying solely on silicone can lead to the sink shifting or sagging over time.

Does a kitchen sink have to have a trap?

Yes, a P-trap is mandatory. Escaping sewer gases from your kitchen and eliminating unpleasant odours are two benefits. The trap also helps catch debris to avoid clogging your plumbing system.

Can you install a sink in an existing countertop?

Absolutely. We can install sinks in existing countertops, including those made of granite or timber, but this may require precise cutting and reinforcement. Our team has the expertise to handle these installations without damaging your countertop.

How long does it take a plumber to install a kitchen sink?

This depends on the type of sink and the complexity of the plumbing. A professional kitchen sink installation usually takes between one and two hours. More complicated setups, such as farmhouse sinks or those requiring cabinet modifications, may take longer.

When you change the sink, do you also need to change the countertop?

Not necessarily, as long as the new sink fits the existing cutout. We can make any necessary plumbing adjustments to ensure it works properly. This option saves you money and reduces renovation time.

What if I Want to Avail Kitchen Sink Installation Services?

If you’re ready to upgrade or replace your kitchen sink, we’re here to help. At All Needs Plumbing, we offer a $0 callout fee, so you only pay for the service you need. We provide 24/7 same-day service because we know plumbing issues don’t wait for business hours. 

A 15% discount is also available for seniors. Additionally, we offer a $150 discount on the installation of hot water systems. Our team is experienced, friendly, and committed to getting your kitchen sink installed quickly and correctly the first time. Contact us today and let’s get your kitchen working perfectly again.

Why Choose All Needs Plumbing for Your Kitchen Sink Installation?

With years of experience in kitchen renovations and plumbing, I’ve seen firsthand how a professional installation saves you time, money, and headaches down the track. We handle everything from start to finish, so you don’t have to lift a finger. Our attention to detail means no leaks, no misaligned pipes, and no unexpected problems. Trust us to make your kitchen sink installation smooth, reliable, and hassle-free.

Available 24/7 For Emergency

1300 110 230 Get a Free Quote