Replacing a kitchen sink tap can be a manageable DIY job when the existing plumbing is accessible and compatible with your new tap. If you’re wondering how to fit a kitchen tap, the process generally involves isolating the water supply, removing the old tap, fitting the replacement and checking the connections carefully for leaks.

Replacing an existing tap is usually more straightforward than altering pipework or changing the way your water supply is connected. However, older plumbing, seized fittings, restricted access beneath the sink, or missing isolation valves can quickly make a simple replacement more complicated. Taking a few minutes to check the existing installation before you begin can help you avoid unexpected problems later.

Before You Start: Check Your New Tap Fits

Make sure the tap and any new fittings or connectors are suitable for use with drinking water. WaterSafe recommends using compliant plumbing products that have been tested for use with drinking water.

Before removing your existing tap, check that the replacement suits your sink or worktop and is compatible with the existing plumbing. A few simple checks before you start can prevent you from getting halfway through the installation only to discover that something doesn’t fit.

Check the following:

• The number of tap holes: Make sure the new tap matches the number and arrangement of holes in your sink or worktop.
• The space underneath: Check that there is enough room beneath the sink for the fixing kit, connections and any tools you will need to install the tap.
• The connector length: Make sure the supplied tails or connectors can reach the existing water supplies without being stretched, kinked, twisted or bent sharply.
• Water pressure: Check whether the new tap has any minimum or maximum pressure requirements, particularly if it is a mixer or specialist tap.
• Existing connections: Make sure the connections supplied with the new tap match the existing plumbing.

Checking these details before you begin will make the installation more straightforward and help you spot potential problems before you remove the old tap.

What Tools Do You Need to Fit a Kitchen Tap?

The exact tools you’ll need depend on the tap and its fixing system, but it’s useful to have the following to hand:

• Adjustable spanner
• Basin wrench or tap spanner
• Screwdriver, depending on the fixing kit
• Bucket or bowl
• Towels or cloths
• Appropriate fittings or connectors if the existing connections do not match the new tap

Fitting kits can vary between tap manufacturers, so check the installation instructions supplied with your tap before you begin. They will tell you which components are included and whether any additional tools or fittings are required.

Stop and get help if: you cannot fully isolate the water supply, an isolation valve starts leaking, the existing pipework is damaged or heavily corroded, or replacing the tap requires you to alter pipework you’re not confident working on.

How to Remove the Old Kitchen Tap

1. Clear the Cupboard Under the Sink

Remove anything stored beneath the sink so you have enough room to see and reach the water connections and tap fixing.

Good access makes the job much easier, particularly when you need to work with both hands underneath the sink. Move cleaning products, bins and other stored items out of the way before you start.

2. Turn Off the Water Supply

If isolation valves are fitted beneath the sink, close the valves on both the hot and cold water supplies before disconnecting the tap.

If there are no suitable local isolation valves, you may need to turn off the property’s main internal stopcock instead.

Once the water is isolated, open the tap to release any remaining water and pressure in the pipework. Keep a bucket or bowl and a towel underneath the connections to catch any water that drains out.

3. Disconnect the Hot and Cold Water Connections

Using an appropriate spanner, carefully disconnect the hot and cold water supplies from the old tap.

Have a container or towel underneath the connections to catch any residual water. Before disconnecting them, make a note of which connection supplies hot water and which supplies cold water. This will help you connect the replacement correctly.

4. Undo the Tap Fixing

The tap is normally secured underneath the sink with a washer, fixing plate or bracket and a tap fixing nut or similar fitting.

This can be one of the more awkward parts of the job. Backnuts and other fittings can corrode or seize over time, while access behind a deep sink can be extremely restricted.

If a fitting is stuck, avoid simply forcing it. Excessive pressure can damage the surrounding pipework or the sink. If you cannot safely reach or release the fixing, it may be better to get professional help rather than risk causing further damage.

5. Lift Out the Old Tap and Clean the Area

Once the fixing and water connections have been removed, lift the old tap out from above the sink.

Before positioning the replacement, clean around the tap hole and remove any old grime, sealant or limescale. This gives the new tap a clean surface to sit against and makes it easier to achieve a secure fit.

How to Fit a Kitchen Tap Step by Step

Once the old tap has been removed and the area around the tap hole is clean, you can install the replacement.

1. Assemble the New Tap

Follow the manufacturer’s instructions and assemble the tap as directed. Depending on the design, this may involve fitting O-rings or base seals, threaded fixing rods, washers or fixing plates, kitchen tap connectors and other components supplied with the tap.

Use the components supplied with the new tap unless the manufacturer’s instructions say otherwise. Don’t assume fittings from the old tap will be suitable for the replacement.

2. Feed the Tap Through the Sink or Worktop

Feed the tap and its connections through the existing hole from above. Before securing it underneath, check that the tap is positioned correctly and facing the direction you want it to. It is much easier to make adjustments before the fixing is tightened.

3. Secure the Tap From Below

From underneath the sink, fit the supplied washer, plate or bracket and fixing nut according to the manufacturer’s instructions.

Hold the tap straight while tightening the fixing so it doesn’t twist out of position. Tighten it securely, but avoid overtightening, as excessive force can damage the sink, fittings or washers.

4. Connect the Hot and Cold Water Supplies

Connect the hot and cold supplies to the corresponding tap tails or connections, following the manufacturer’s markings or instructions.

Some installations use flexible tap connectors, while others may have a different arrangement depending on the tap and existing plumbing.

Don’t automatically use PTFE tape on every threaded connection. The correct sealing method depends on the type of fitting being used, so follow the manufacturer’s instructions for the tap and its connections.

5. Turn the Water Back On Slowly

Once everything is connected, restore the water supply slowly and run the tap. Let it run briefly to clear any trapped air while checking the connections as the system repressurises.

6. Check Carefully for Leaks

Check all the connections while the water is running, paying particular attention to:

• Both hot and cold water connections
• Flexible tails or other connectors
• Around the base of the tap
• Inside the cupboard underneath the sink

Don’t assume a connection is sound just because it doesn’t drip immediately. Check underneath the sink again after the tap has been used for a while.

If you notice water collecting underneath the sink, turn off the water supply and identify the leak source before continuing to use the tap.

What If Your Old Tap Doesn’t Have Flexible Connectors?

Not every kitchen tap installation will look like the neat setup shown in a typical DIY guide.

Older installations may have copper pipework connected directly to the tap rather than the flexible connections commonly found in newer installations. Your replacement tap may also come with flexible tails that don’t simply connect to the existing pipework.

In this situation, the existing plumbing may need suitable adapters or other connections to make the new tap compatible. You may also need to install or replace isolation valves.

This is not a job where it’s worth cutting or modifying water pipes based solely on a generic DIY guide. If the new tap doesn’t connect to the existing plumbing as expected, getting professional advice can be safer and easier than trying to adapt the installation yourself.

Common Problems When Replacing a Kitchen Tap

Even a straightforward kitchen tap replacement can come with a few unexpected problems. Here are some of the most common issues you may encounter and what to do about them.

The old fixing won’t come loose

Corrosion can cause the fixing or backnut underneath an older tap to seize. Restricted access can make it even harder to remove. Avoid using excessive force if it could damage the sink or surrounding pipework.

The new connectors don’t match

The existing pipework may use different connection types from those supplied with your new tap. If the connections don’t match, the plumbing may need to be adapted rather than forcing the fittings together.

The tap moves after fitting

Recheck the fixing kit and make sure the washer, bracket and fixing components have been fitted correctly. Tighten the fixing sufficiently to hold the tap securely, but avoid overtightening.

There’s a small leak underneath

Isolate the water supply and check the relevant connection. Don’t simply keep tightening the fitting, as excessive force can damage the connection or seal.

There’s no isolation valve

If there is no local isolation valve beneath the sink, you may need to turn off the property’s main water supply before disconnecting the tap.

When Should You Get a Plumber to Fit the Tap?

Knowing how to replace a kitchen tap can help you decide whether a replacement is suitable for a DIY job, but there are situations where getting professional help is the safer and easier option.

Consider contacting a plumber if:

• The existing pipework needs modifying.
• The isolation or shut-off valves don’t work properly.
• Existing fittings are badly corroded or seized.
• Access underneath the sink is extremely limited.
• A leak appears after installation, and you cannot identify the source.
• You’re not confident isolating and reconnecting the water supply.

A straightforward replacement may not require professional help, but once the job involves modifying pipework or dealing with damaged, seized or difficult-to-reach fittings, a plumber can help prevent a small job from becoming a much bigger problem.

If you need help with a tap replacement, plumbing alterations or an issue with your existing water connections, contact Absolute Plumbing Limited to assess the installation and carry out the work safely.

FAQs

Can I fit a kitchen tap myself?

Yes, you can often fit a kitchen tap yourself if the existing plumbing is accessible, the water supply can be safely isolated and the replacement is compatible. However, if pipework needs modifying, fittings are badly corroded or access is restricted, it may be safer to use a plumber.

Do I need to turn the water off to change a kitchen tap?

Yes. Always isolate the water supply before disconnecting the existing tap. If isolation valves are fitted beneath the sink, close the valves on both the hot and cold supplies. If there are no suitable local isolation valves, you may need to turn off the property’s main internal stopcock instead.

How long does it take to replace a kitchen tap?

A straightforward tap replacement can usually be completed relatively quickly, but the time required depends on the existing installation. Seized fittings, restricted access, incompatible connections or modifications to the plumbing can make the job take considerably longer than a simple like-for-like replacement.

Do all kitchen taps fit all sinks?

No, kitchen taps are not universally compatible with every sink. Different taps can require different hole arrangements, mounting space and water connections. Before starting, check the replacement tap’s specifications against your existing sink or worktop, including the available space underneath for securing and connecting it.

Do I need a plumber to replace a kitchen tap?

Not necessarily. A compatible replacement with accessible, working connections may be suitable for DIY installation. However, you should consider using a plumber if the existing pipework needs modifying, isolation valves do not work, fittings are seized or corroded, or access underneath the sink is particularly difficult.

Why is my new kitchen tap leaking underneath?

A new kitchen tap may leak underneath because a connection is loose or has not sealed correctly, a washer or seal is incorrectly positioned, or a fitting has been overtightened and damaged. Turn off the water supply and check the relevant connection against the manufacturer’s instructions. If you cannot identify the cause, contact a plumber.

Ready to Fit Your New Kitchen Tap?

Replacing a kitchen tap can be a straightforward job when the existing plumbing is accessible and compatible with the new fitting. Check everything before you start, isolate the water supply, follow the manufacturer’s instructions and check each connection carefully once the water is back on.

Most importantly, don’t force fittings that are seized, inaccessible or incompatible. If the existing plumbing needs altering or the installation looks very different from the standard process, getting professional help can be the safest and simplest option.

Not sure your tap is a DIY job? Absolute Plumbing Limited can take care of the installation for you.