Intro

On many jobs, clients ask for a garden tap before summer. Here’s a straight, practical guide to install an outdoor tap at your house. We cover tools, pipe sizes, drilling, backflow rules, and testing. You’ll see every step from marking the wall to final sealant. It’s simple work if you plan it right. Most installs take 1.5–3 hours. We also share pricing tips and a clean finish method that prevents winter damage.

Quick Answer

To install an outdoor tap, tee off the cold mains, fit an internal isolating valve and drain‑off, drill a sloped hole, mount a wall plate and hose union tap with a double check valve, connect 15 mm pipe, pressure test at 3 bar for 10 minutes, then seal and insulate. Typical height is 600–900 mm above ground.

Inhoudsopgave

• Key Takeaways
• Plan It Right: Route, Rules, and Tools
• What You Need to Install an Outdoor Tap at Your House
• Step‑By‑Step: Install an Outdoor Tap at Your House
• Test, Seal, Insulate, and Finish
• Pricing, Timing, and Common Mistakes
• FAQ
• Conclusion

Key Takeaways

• Use 15 mm pipe, a double check valve, and an isolator with drain‑off.
• Drill a 22 mm hole with 5–10 mm fall to the outside.
• Mount the tap 600–900 mm high using 6 x 60 mm screws and plugs.
• Pressure test at 3 bar for 10 minutes before sealing.
• Insulate inside pipework and drain down before frost.

Plan It Right: Route, Rules, and Tools

A clean route saves time. Pick the shortest run from a cold mains pipe, often under a kitchen sink. Avoid hot feeds. Aim for an internal isolating valve within 300 mm of the exit point. Add a drain‑off so you can empty the line in winter.

Know the rules. In the UK, outside taps need backflow protection. Fit a double check valve (many hose union bib taps include one) to meet BS EN 1717 and Water Regulations. Use WRAS‑approved parts. Don’t connect to softener outlets or tanked supplies.

Have the right tools ready:

• 22 mm diamond or carbide core bit (for the sleeve)
• SDS drill and 8 mm masonry bit (plugs)
• Adjustable spanner, pipe wrench, PTFE tape (8–12 wraps)
• Pipe cutter, deburrer, flux and torch (if soldering), or push‑fit tools
• Silicone or mortar, spirit level, tape measure

What You Need to Install an Outdoor Tap at Your House

Materials that keep the job tight and compliant:

• Hose union bib tap 1/2" with integral double check valve
• Wall plate elbow 1/2" x 15 mm
• 15 mm copper or barrier PEX pipe and clips (every 300–500 mm)
• 15 mm isolating valve and 15 mm drain‑off valve
• 15 mm tee to connect to mains
• 22 mm conduit/sleeve for the wall penetration
• Rawl plugs and 6 x 60 mm exterior screws
• Pipe insulation for the indoor run

Tip: Sleeve the pipe through the wall. It protects the pipe and allows movement. Seal the sleeve to the wall, not the pipe, so the pipe can expand.

Step‑By‑Step: Install an Outdoor Tap at Your House

Follow these steps in order. Keep it neat and you’ll be done fast.

1. Isolate and drain

• Turn off the stopcock. Open a cold tap to relieve pressure. Place towels or a tray.

2. Mark the position

• Choose 600–900 mm above finished ground. Check there’s clear space inside. Mark wall plate holes with a level.

3. Drill plug holes

• Use an 8 mm masonry bit for plugs. Don’t fix the plate yet.

4. Drill the wall penetration

• From inside, drill a pilot, then a 22 mm core hole. Angle it with 5–10 mm fall towards the outside. This lets water drain.

5. Fit the sleeve

• Push a 22 mm sleeve into the hole. Trim flush. Don’t foam the pipe in place; the sleeve must remain free.

6. Prepare the tap assembly

• Wrap the bib tap’s thread with 8–12 wraps of PTFE. Thread it into the wall plate elbow. Nip up with a spanner. Keep the outlet pointing down.

7. Mount the wall plate

• Plug the holes. Fix the plate with 6 x 60 mm exterior screws. Check the tap is level.

8. Run the internal pipe

• From the tee on the cold mains, run 15 mm pipe to the hole. Fit a 15 mm isolating valve and a 15 mm drain‑off valve on the straight run, ideally within 300 mm of the wall. Clip the pipe every 300–500 mm.

9. Connect through the wall

• Pass 15 mm pipe through the sleeve to the wall plate elbow. Use a 15 mm compression or solder joint at the elbow. Inside, connect the run to the tee with solder or push‑fit. Wipe flux. Support all joints.

10. Backflow check

• Ensure the tap or the line includes a double check valve. If the tap doesn’t have one, add an inline 15 mm double check valve on the indoor run.

11. Pressure test

• Close the drain‑off. Open the stopcock and isolating valve slowly. Check for leaks. If you can, test to 3 bar for 10 minutes. Tighten any weeps.

12. Seal and finish

• Seal around the sleeve outside with silicone or mortar. Insulate the indoor pipe. Fit a hose guard plate if needed. Label the isolator and drain‑off.

Time on site: planning 20 minutes, drilling 10–15 minutes, pipe and fixings 40–70 minutes, test and finish 20–30 minutes. Total 1.5–3 hours for a standard run under 2 metres.

Test, Seal, Insulate, and Finish

• Test method: Close all outlets. Pressurise to operating pressure (often 2–3 bar). Hold 10 minutes. Dry tissue on each joint shows weeps fast.
• Seal right: Seal the sleeve‑to‑wall interface, not sleeve‑to‑pipe. This avoids stress and allows movement.
• Insulate: Use 13 mm wall insulation on indoor runs, especially in garages and utility rooms. Clip before and after bends.
• Winterise: To drain down, close the isolator, open the outdoor tap, then open the drain‑off. Leave the outdoor tap open over winter to prevent trapped water.

Pricing, Timing, and Common Mistakes

On most jobs, a straight run with one tee and one elbow is quick. Complex routes, boxed‑in cupboards, or thick stone walls take longer.

Typical materials: £35–£75. Typical labour: 1.5–3 hours.

Common mistakes to avoid:

• No backflow protection. Always include a double check valve.
• Level hole. Always create 5–10 mm fall to the outside.
• No drain‑off. You need to drain down before frost.
• No sleeve through masonry. Pipes need a 22 mm sleeve.
• Loose fixings. Use proper plugs and 6 x 60 mm screws in sound brick, not soft mortar.

Quoting tip: Snap a few site photos and record pipe route notes. Tools like Donizo let you capture details by voice, turn them into a clear proposal, and send a branded PDF for e‑signature. After acceptance, convert to an invoice in one click. That keeps small jobs tidy and paid.

Internal resources to explore:

• See our guide to "professional proposals" for fast, clean quotes.
• Read "pricing labour and materials" for margin control on small works.
• Check "invoice templates" to speed up end‑of‑job admin.

FAQ

Do I need a double check valve on an outdoor tap?

Yes. UK Water Regulations and BS EN 1717 require backflow protection. Many hose union bib taps include an integral double check valve. If yours doesn’t, fit a 15 mm inline double check valve on the cold feed to the tap.

What height should I mount the tap?

Most installers set the outlet between 600–900 mm above finished ground. Pick a height that’s easy to reach and keeps hoses off the ground. Keep clear of steps and door swings.

Can I tee from the kitchen cold feed?

Usually yes, if it’s a mains cold feed. Don’t tee from a tank‑fed line. Fit an isolating valve and a drain‑off on the branch, and ensure backflow protection with a double check valve.

How do I prevent freezing in winter?

Fit an isolator and a drain‑off indoors. Before frost, close the isolator, open the outdoor tap, then open the drain‑off to empty the line. Insulate indoor pipework. In very cold areas, consider a frost‑proof tap body.

Do I need permission or to notify Building Control?

In general, a like‑for‑like outside tap addition isn’t notifiable to Building Control. But the work must comply with the Water Supply (Water Fittings) Regulations. Use WRAS‑approved parts and include backflow protection.

Conclusion

Installing an outdoor tap is straightforward when you plan the route, protect against backflow, and include a drain‑off. Use 15 mm pipe, a sloped 22 mm wall sleeve, and test to 3 bar for 10 minutes before sealing. Next steps:

• Walk the route and mark your heights and fixings.
• Pre‑assemble your tap and wall plate on the bench.
• Fit the isolator and drain‑off within 300 mm of the wall.

If you quote small plumbing jobs often, platforms such as Donizo help you capture site notes by voice, send proposals for e‑signature, and invoice fast. Do it once, do it right, and you’ll avoid call‑backs all year.