General Tap Installation Guide
The below guide will give you a general overview of the tools and methods required to install or change your bathroom taps. Please note all taps will be different and instructions will be supplied with most taps. Please use the services of a qualified plumber if you are at all unsure and don't feel competent to undertake the work.
Tools and Materials Needed:
- New tap
- Tap or adjustable spanner
- Plumber's tape (ptfe tape)
- Plumbers paste (thread sealant)
- Silicone sealant (optional)
- Bucket or towel (to catch any water)
- Plumbers’ putty (optional)
We use the term sink and basin. The general guide will apply to both basins and sinks when sink is mentioned.
Some taps have a single cold or premixed water supply and others will require a hot and cold water supply. This guide will need to be read and interpreted to suit the water supply required for your chosen tap.
Step 1: Turn Off Water Supply
Before starting, make sure to turn off the water supply to the sink. You'll usually find the shut-off valves under the sink. Turn them clockwise to shut off the water. Occasionally there will be no shut off valves installed, if this is the case the water will need to be shut off at the mains shut off or stop cock valve. It is regulation to fit shut off valves to all water outlets, so you will need to install shut off valves if none are fitted. (This guide doesn't cover retro fitting shut off valves).
Open the taps to relieve any pressure. If you have turned off the water supply at the mains shut off valve open any other taps in the system and leave them open whilst replacing the taps.
You may need to drain down your hot water tank if one is fitted, if no isolation or shut off valves are fitted. Consult your heating engineer for advice. (This guide does not cover draining down the hot water tank and refilling).![]()
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Step 2: Remove the Old Tap (if applicable)
Place a bucket or towel under the water connection to catch any water left in the pipework. Flexible buckets are ideal for the tight spaces under sinks and around pipework. If you’re replacing an old tap, use an adjustable or tap spanner to disconnect the water supply hoses. Some taps will have flexible hoses, some copper tails and others attached directly to the water inlet pipe with a tap connector. Then, remove any screws or bolts securing the tap to the sink. You might need a basin spanner to reach hard-to-reach nuts. Once the tap is loose, carefully lift it away.Step 3: Clean the Area
Clean the sink area where the tap will be installed. This ensures a good seal and prevents dirt or grime from interfering with the installation.Step 4: Apply Plumber’s Tape or paste (if needed)
There is mixed opinions amongst plumbers about whether plumbers tape, plumbers paste or nothing is required on threads, olives and pipe joints. Everyone has their own opinion and we won't add to the debate, but the details below allow for your chosen preference.
Wrap plumber's tape (ptfe tape) around the threads of the tap connectors to ensure a tight, leak-free seal when you attach the water supply lines. Be sure to wrap in the direction of the threads.
Apply plumbers paste to the threads, pipework and any olives to ensure a leak-free seal when you attach the water supply lines.Step 5: Install the New Tap
- Place the Tap: Position the new tap into the hole(s) on your sink. Ensure it aligns with the tap hole(s) correctly.
- Secure the Tap: Underneath the sink, slide the securing nuts or washers onto the tap’s mounting bolts and tighten them. You may need to use a basin spanner to get a good grip on the bolts.
- Don’t overtighten, but make sure the tap is secure and doesn’t wobble or move.
- Check the Position: Ensure the tap is aligned properly, and the spout faces the centre of the sink for optimal use.
Step 6: Connect Water Supply Lines
- Attach the Hoses: Connect the hot and cold water supply hoses to the corresponding tap connectors. Tighten them by hand first, then use an adjustable spanner to give them a final tighten (but don’t overtighten).
- Ensure Proper Connection: Make sure the hoses are attached firmly and correctly (hot to hot, cold to cold).
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Step 7: Apply Silicone Sealant (Optional)
If your tap comes with a base that needs to be sealed (e.g., a deck-mounted tap), apply a thin layer of silicone sealant around the base to prevent water from leaking beneath the tap. Silicon sealant is a personal choice and again splits opinion with professional plumbers. We won't join the debate, but details are given if it is your choice.
Step 8: Turn On Water Supply
Turn the water supply valves back on slowly. Check for any leaks around the water connections and base of the tap. If you notice any leaks, tighten the connections gently.
Step 9: Test the Tap
Turn on the tap to test the water flow, checking both the hot and cold functions. Make sure there are no drips or leaks, and that the water flows smoothly.
Step 10: Final Checks- Wipe away any excess silicone sealant, plumber’s tape or paste from the installation.
- Check the surrounding area for leaks again after a few minutes of use.
- Thoroughly clean the sink or basin to remove and dirt and installation debris.
Tips:
- If the tap doesn’t come with mounting hardware (e.g., washers or nuts), you might need to buy them separately.
- Some taps come with an installation template or instructions—follow them for specific details.
- If you're having trouble with the water connections, consider using a basin spanner for better leverage.
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Posted by Paul Thorn
21st February 2025
