A 1930s semi on Prestwick Road in Oxhey, WD19, called us after a DIY outside tap kit
split at the first hard frost, flooding the
utility room and leaving a repair bill of over £400 that a properly fitted double check valve and isolation
point would have prevented.
Every outside tap installation Watford job we complete includes a
WRAS-approved double check
valve, an internal isolation valve, and a full
pressure test before we leave. That
keeps your new tap legal, not just working on day one.
What Does Outside Tap Installation Involve?
Outside tap installation adds a dedicated cold or hot water outlet to an external wall, connected safely
to your home's mains supply. A qualified plumber taps
into the existing cold pipe, fits a WRAS-approved double check valve to meet UK water regulations, and
adds an isolation valve for winter drain-down.
Most Watford homes take a self-cutting saddle valve connection into the nearest 15mm cold pipe, usually
near a kitchen, bathroom, or utility room. A short run of pipe is routed through the outside wall using a
wall flange for a weatherproof finish, then connected to the tap itself.
Victorian terraces in Nascot Wood and Central Watford often have thicker solid walls, while 1930s semis
in Oxhey and Garston usually need a shorter, simpler run. We check wall thickness and pipe access during
the initial survey, before confirming your fixed price.
How We Fit Your Outside Tap
1
Survey and Quote
We check your wall type, nearest pipe, and access, then confirm a fixed price with no hidden extras.
2
Isolate the Supply
The mains or nearest stopcock is turned off before any pipework is cut or connected.
3
Fit the Valve and Pipe
A double check valve and isolation valve are fitted, then pipe is routed through the wall.
4
Mount and Test
The tap is mounted, joints checked, and the system pressure-tested for leaks before the water is left on.
5
Winter-Proof the Line
We show you how to isolate and drain the tap each winter to avoid frost damage.
Outside Tap Installation Cost Guide (Watford)
Job Type
Typical Price (Watford)
Cold-only outside tap, straightforward access
£120 - £180
Cold-only outside tap, longer pipe run or harder access
£180 - £240
Hot and cold mixer outside tap with thermostatic valve
£220 - £300
Added frost protection (insulation and drain-down valve)
+£20 - £40
Why Choose Watford Plumbers for Your Outside Tap
Gas Safe registered company (reg. 574111), for every job we quote
No call-out fee, ever, on any outside tap installation
WRAS-approved double check valve fitted as standard on every job
Same-day and next-day booking across WD17 and WD18
Fixed, upfront price agreed before any work begins
Local experience with Watford's
hard water and Thames Water supply area
Areas We Cover
We install outside taps across WD17 and WD18, and extend our outside tap installation service to WD19,
WD23, WD24, and WD25 on request.
Local areas we cover regularly include Nascot Wood, Oxhey, Cassiobury, Bushey, and Rickmansworth, along
with the streets around Garston and Watford Junction.
Most outside tap installations in Watford cost between £120 and £280, depending on access, pipe
run length, and whether you choose a cold-only or combined hot and cold tap. We give a fixed,
upfront quote after a quick look at your property, with no call-out fee added.
Same-day and next-day appointments are available across WD17 and WD18 for most bookings. Call
before midday and we can often fit your outside tap that afternoon. Every job is scheduled with a
clear arrival window so you are not left waiting in all day.
Yes, UK water regulations require every outside tap to have a double check valve fitted. This
stops contaminated garden water flowing back into your drinking supply. Our engineers always fit
a WRAS-approved valve as standard, meeting Water Supply (Water Fittings) Regulations 1999 in full.
Yes, an unprotected outside tap can freeze and split in cold weather, often causing a leak once it
thaws. We fit an internal isolation valve so you can shut off and drain the tap each winter, and
insulated pipework to reduce the risk further.
Yes, we can run a second pipe from your hot water supply to give you a mixed hot and cold outside
tap. This is popular for washing muddy dogs or garden tools. A thermostatic valve is fitted to
prevent scalding, as required for safety.
Yes, we cover Nascot Wood, Oxhey, Cassiobury, Garston, Bushey and Rickmansworth alongside WD17
and WD18. Victorian terraces and 1930s semis across these areas often need different pipe routing
depending on wall thickness, which our engineers always assess before confirming your fixed price.
Fitting an outside tap yourself is legal, but the pipework must still meet Water Supply (Water
Fittings) Regulations 1999, including a double check valve. Many DIY kits are fitted without one.
If unsure, an honest assessment from a qualified plumber avoids a costly mistake.
No call-out fee, ever.
Call 07425 281 744 or contact us online to book your outside tap installation.
WhatsApp us a photo of your outside wall for a faster upfront quote -- no call-out fee, ever.
