How to Install an Outside Tap (UK DIY Guide)
Installing an outside tap is useful for garden watering, car washing and general outdoor cleaning. While many DIYers can complete this job, it involves connecting to your internal cold water supply and drilling through an exterior wall.
This step-by-step UK guide explains how to install an outside tap safely and when professional help may be required.
Tools You’ll Need
- Adjustable spanner
- Pipe wrench
- Drill with masonry bit
- Spirit level
- PTFE tape
- Pipe cutter (if required)
Materials Required
- Outside tap kit (tap, backplate and wall plate elbow)
- Isolation valve
- Pipe fittings
- Rawl plugs and screws
- Pipe clips
Step 1: Choose the Location
Select a spot close to your internal cold water pipe.
Ensure the location is:
- Accessible
- Away from electrical wiring
- At a suitable height
- Protected from frost where possible
Step 2: Turn Off the Water Supply
Turn off the internal stopcock.
Open a downstairs tap to drain residual water.
Confirm no water is flowing before cutting any pipe.
Step 3: Drill Through the Wall
Drill a hole through the wall at a slight downward angle towards the outside.
This helps prevent water flowing back into the property.
Insert the pipe sleeve through the wall.
Step 4: Connect to the Cold Water Pipe
Cut into the internal cold water pipe.
Install an isolation valve.
Connect the pipe leading to the outside tap kit.
Secure fittings using PTFE tape where required.
Step 5: Secure the Outside Tap
Fix the backplate securely to the external wall.
Attach the outside tap to the wall plate elbow.
Tighten carefully.
Step 6: Turn the Water Back On
Slowly turn the internal stopcock back on.
Open the new outside tap.
Check for leaks inside and outside.
Tighten connections if necessary.
Common Mistakes to Avoid
- Connecting to hot water supply
- Not fitting an isolation valve
- Drilling without checking for cables or pipes
- Overtightening brass fittings
- Failing to protect pipe from frost
Outdoor taps should ideally include a double check valve to prevent backflow.
When to Call a Professional
You should contact a plumber if:
- Pipework needs rerouting
- You are unsure about drilling through walls
- There are no nearby cold water pipes
- Leaks occur inside the property
- You require frost protection upgrades
See our Plumbing Repair Cost Guide for typical UK pricing.