How To Fit an Inset Kitchen Sink

how to fit a kitchen sink

Whether you're fitting a new sink in your brand new kitchen or looking to replace an existing sink with a shiny new one, we've put this guide together to help you get your new sink installed and ready to go!

Step 1: Remove the old sink (if replacing)

If you're installing a new sink in a brand new kitchen then you can skip to step 3!

To remove your old kitchen sink, firstly you’ll need to start by turning off the hot and cold water supply and disconnecting the waste pipe. If your sink has been secured to the worktop with silicone sealant, you’ll need to carefully cut it off with a knife.

remove a kitchen sink

Take a look underneath the sink and you’ll be able to locate multiple clamps and fixing clips that keep the sink in place. You'll need to undo these, and to do this you'll need to use a slot-headed screwdriver. You can then lift the old sink completely out of the worktop space and out of the way ready to prep the area for your new sink.

Step 2: Clean and treat the worktop

Once your old kitchen sink is out, ensure to thoroughly clean the area and remove any old sealant so it is prepped and ready for your new sink to be fitted (being careful not to scratch the worktop in the process!). You can then also apply a new waterproof sealant with a brush and leave it to dry, helping to protect your worktop from any water escapes.

Step 3: Assemble your new kitchen sink

While the sealant is drying, take this time to assemble your new sink ready for installation (referring to the manufacturer’s instructions). This could also include the tap and waste unit, so make sure these are also ready to go. You’ll also need to attach the new fixing clips (which will come with your new sink) these will hold the sink in place - with two on each side for stability.

Step 4: Apply sealing strip/putty


When installing a new kitchen sink you must ensure that you properly seal the edges of the sink where it sits on your worktop. This seal is needed to prevent any water leaks and to avoid damage to your worktop.

Turn your sink upside down so you can easily apply the seal (which each sink is supplied with). This will usually come as either an edging strip that has an adhesive side or as a small tub. These are both designed provide a watertight seal which is long-lasting and durable. Apply this all around the edge of your sink to ensure complete protection.

Step 5: Position the sink

Carefully place and position your new sink in the gap left by your old model (or in the new gap created in your new kitchen) to ensure a comfortable fit. The sink should sit perfectly on the sealing putty around the edges that sit on your worktop.

Step 6: Clamp the clips


With the clips you’ve already attached in step 3, you need these fit the sink’s rim to the worktop. Clamp the sink firmly in place and cut off any excess sealant where possible for a neater appearance.

Step 7: Taps & Pipes


To attach new taps or put your new back on to water supply pipes, you’ll need to use connectors. Then, apply PTFE tape to the thread of the pipe - where it joins the tap - to create a watertight seal.

Final step...put it to the test!

Turn the water back on and position a bucket under the waste pipe. Do not reinstall the waste pipe yet as it is easier to fix any leaks first. If there aren’t any leaks, continue to re-fit the waste piping. Then, open the taps and check for any leaks and apply the waste plugs.


And there you have it! Your brand new inset kitchen sink is fitted and ready to go.

If you found this post useful, you might also like - How to Fit New Taps - The Best Kitchen Sink Taps - Kitchen Sink Buying Guide.

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