Shower Plumbing

Shower Plumbing near you

Shower plumbing covers everything between the incoming water and the outlet: the valve, the supply arrangement that feeds it, the pump where one is fitted, the tray or enclosure waste, and the branch pipe that carries the water away. Most British houses have one of a small number of arrangements, and which one you have decides whether a new shower is a half-day swap or a job that touches the hot water system.

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This type of work often has to be done by a licensed or certified trade. Ask to see licences and proof of insurance before work starts.

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The two questions that decide a shower installation are pressure and temperature. Pressure decides what will work: a mixer fed from a loft cistern behaves nothing like one fed from a combination boiler, and putting a high-flow head on a supply that cannot deliver the flow produces disappointment rather than a shower. Temperature decides what is safe, and this is where British guidance is more specific than most people expect — and more specific about baths than about showers.

There is one more thing that shows up in a shower and nowhere else in a house: warm water sitting still in a head and hose between uses, then being turned into an aerosol you breathe. That is a small risk in a family home in regular use and a larger one in a holiday let or a rarely used second bathroom, and it is worth a paragraph rather than a shrug.

Which shower your supply will actually run

An electric shower, which takes cold water and heats it on demand, so it works on almost any supply but delivers a flow limited by its own rating.
A manual mixer, which blends stored or boiler hot with cold and relies on you to correct the temperature when something else in the house draws water.
A thermostatic mixer, which holds a set temperature against changes in incoming pressure and is the default choice in a modern British bathroom.
A gravity-fed mixer served from a loft cistern and a hot water cylinder, which needs enough height between the cistern and the head to work at all.
A pumped gravity system, where a twin-impeller pump boosts both hot and cold feeds; a pump drawing more than 12 litres per minute from the supply is one of the fittings needing advance notice to the water undertaker.
A mains-pressure mixer fed by a combination boiler or an unvented cylinder, where flow is limited by the incoming supply rather than by height.
A digital or remote-processor shower, which is a thermostatic mixer with the valve sited away from the wall, usually chosen for a tiled recess with no room for a bar valve.

Scalding at a shower: what the Building Regulations do and do not require

This surprises people, so it is worth stating plainly. Requirement G3(4) of Schedule 1 to the Building Regulations 2010 says that the hot water supply to any fixed bath must be designed and installed to incorporate measures ensuring the temperature of the water that can be delivered to that bath does not exceed 48 degrees Celsius. It says fixed bath. It does not say shower. There is no equivalent numerical ceiling written into Part G for a shower outlet.

What Part G does say about showers is broader. Approved Document G, the 2015 edition with 2024 amendments, states that requirement G3(4) will be met if the hot water outlet temperature is appropriate for the appliance being served and any device limiting the maximum temperature at the outlet cannot be easily altered by building users. The second half of that sentence is the useful one for a shower: a thermostatic valve with a factory-set override button is doing exactly what the guidance describes, and a valve whose maximum can be turned up by anyone who finds the ring is not.

So a thermostatic shower valve is a sensible choice rather than a legal requirement in an existing house, and it becomes more than sensible where children, older people or anyone who cannot react quickly to a temperature change will use the room. Approved Document G is guidance for England; Wales publishes its own editions, Scotland works to its building standards technical handbooks, and Northern Ireland uses the Department of Finance technical booklets, so check your own country rather than reading the English document across.

Flow rates in a new dwelling: the fittings approach numbers

If the shower is going into a newly built dwelling in England, its flow rate is capped by the water efficiency requirement rather than by taste. Approved Document G allows a fittings approach as an alternative to running the full water efficiency calculator, and Table 2.1 sets the maximum consumption for each fitting at the standard level: for a shower, 10 litres per minute. Table 2.2 applies where the optional tighter requirement has been imposed as a condition of planning permission, and there the shower figure drops to 8 litres per minute.

Two details in the Approved Document catch people out. First, the fittings approach is only available if every fitting is within the table — exceed any one value and the full water efficiency calculator must be completed instead. Second, the Approved Document states that where a shower is not to be provided, or where a waste disposal unit, a water softener or water re-use is to be provided, the calculator must be completed regardless. A new house designed around a bath and no shower is not a shortcut.

None of this binds you when you replace a shower in an existing home. The figures are still a useful yardstick, because they describe the flow a modern British shower is designed around, and because a head demanding far more than 10 litres per minute is a head that will expose whatever your incoming supply actually delivers.

Showerheads, stagnation and legionella

HSE points out that showers create and disperse water droplets which may be inhaled, giving a foreseeable risk of exposure to legionella, while noting that where they are used regularly, as in most domestic settings, the risks are reduced.
HSE's summary of control in residential settings is to keep the hot water hot, the cold water cold, and to keep it moving, which in a household is mostly a matter of use rather than equipment.
HSE advises that tenants regularly clean and disinfect showerheads, which is the single most useful maintenance task on a shower and takes a descaling solution and an hour.
HSE describes the risks from hot and cold water systems in most residential settings as generally low, owing to regular water usage and turnover, so this is about the rarely used bathroom rather than the family one.
Where a landlord rents out a property, or even a room within their own home, HSE states they have legal responsibilities to ensure the health and safety of the tenant, and assessing and controlling legionella risk sits inside that.
Run a little-used shower for a few minutes before anyone uses it after a holiday or a void period, directing the spray away from the face while the standing water clears.
Replace a perished hose rather than descaling it repeatedly, since a hose that has been sitting in the tray is also the fitting the water regulations single out for backflow protection.

The shower complaints a plumber hears most often

Temperature swinging when a tap or WC is used elsewhere, which points at a manual mixer, at shared branches, or at a thermostatic cartridge that has furred up.
Weak flow on a gravity system, usually a question of the height between the cistern and the head rather than the shower itself.
An electric shower that runs cooler in winter, which is normal physics rather than a fault: incoming mains water is colder, so the same element raises it less.
Scale narrowing the head and the valve in a hard water area, which shows up first as a spray pattern that has gone ragged at the edges.
A tray or enclosure leaking at the junction rather than in the plumbing, where the water is running behind the tiling and appearing on a ceiling below.
A slow-draining tray, which in a shower is frequently hair and soap in a shallow trap rather than a problem further down the branch.
A pumped shower that has become noisy or cuts out, often air being drawn into the pump because the cistern connection or the flow switch needs attention.

Replacing or installing a shower: the order the work runs in

Establish the supply type first — gravity, pumped, combination boiler or unvented — because it rules out whole categories of valve before anyone chooses a finish.
Measure the actual flow at the existing outlet rather than trusting the boiler's specification, since the incoming supply and the pipework decide what arrives.
Confirm the waste arrangement: Approved Document H's Table 1 gives a shower a trap of 40mm diameter with a 50mm seal, reduced to not less than 38mm only where the appliance discharges directly to a gully.
Agree where the valve body will sit and how it will be reached later, because a concealed valve with no access panel becomes a tiling job the next time it needs a cartridge.
Settle the electrical question separately where an electric or pumped shower is involved, since work in the zones around a bath or shower is treated as a special location in England and is a job for a registered electrician.
Plan the tanking and tiling sequence with the plumbing, not after it, as most shower leaks are finishing failures rather than plumbing ones.
Test at full flow with the tray loaded before anything is boxed in, and again after the silicone has cured.

What drives a shower plumbing quote, and how LokalMatch fits in

A like-for-like valve swap and a full shower installation are different jobs with different price structures. What moves a quotation is whether the supply arrangement is staying the same or changing, whether pipework has to be rerouted or chased into a wall, whether a pump is being added, how the waste will be run and whether the floor build-up allows it, whether tiling and tanking are being disturbed and who is making good, whether an electrician is needed for an electric or pumped unit, and how reachable the valve position is once the wall is closed up. A ground floor shower over a solid floor is a different proposition from the same shower on a suspended timber first floor.

LokalMatch exists to make the introduction. Post the job once with your postcode — what you have now, what you want instead, and whether tiling is part of it — and plumbers working in your area will get in touch. There is no charge to homeowners; pros pay to receive the requests. LokalMatch does not fit showers, plays no part in pricing, and does not vet, rank or recommend anyone who responds, so comparing what each quotation includes, and asking who is responsible for the tiling and the electrics, is your job rather than ours.

Shower Plumbing: frequently asked questions

Does the 48 degree rule apply to my shower?

No. Requirement G3(4) of Schedule 1 to the Building Regulations 2010 is written for a fixed bath and sets its limit on the water that can be delivered to that bath. Part G contains no equivalent numerical limit for a shower outlet. What Approved Document G does say is that the hot water outlet temperature should be appropriate for the appliance being served and that any device limiting the maximum temperature at the outlet should not be easily alterable by building users, which is a good argument for a thermostatic valve with a factory-set maximum.

Is there a legal maximum flow rate for a shower?

Only in a new dwelling in England, and then indirectly. Approved Document G's fittings approach sets maximum fittings consumption values, and Table 2.1 gives a shower 10 litres per minute at the standard water efficiency level. Where the optional tighter requirement has been imposed as a condition of planning permission, Table 2.2 reduces that to 8 litres per minute. Exceeding any value in the table means the full water efficiency calculator has to be completed instead. Replacing a shower in an existing home is not caught by this.

Do I need to worry about legionella from my shower?

In a home in regular use, not much. HSE describes the risks from hot and cold water systems in most residential settings as generally low because of regular water usage and turnover, while acknowledging that showers create and disperse droplets that may be inhaled. Its practical advice is to keep hot water hot, cold water cold and the water moving, and to clean and disinfect showerheads regularly. The case for more care is a rarely used shower, a second home or a holiday let, where the water sits still between uses.

Why does my shower go cold when someone turns on a tap?

Because a manual mixer blends two supplies at fixed proportions, so when one of them loses pressure the blend changes. A thermostatic valve is designed to correct for exactly that and hold the set temperature. If you already have a thermostatic valve and it still swings, the usual suspects are a scaled or seized cartridge, debris in the strainers, or a supply arrangement where hot and cold are at very different pressures — for example a cylinder feeding hot by gravity while the cold comes off the rising main.

Does fitting a shower pump need telling anyone?

It can. The Water Supply (Water Fittings) Regulations 1999 list, among the installations requiring advance notice to the water undertaker in England and Wales, a pump or booster drawing more than 12 litres per minute connected directly or indirectly to a supply pipe. A twin pump on a gravity system drawing from a cistern is a different arrangement from one drawing from the supply pipe, so ask your installer which applies to the pump being proposed. Scotland works to its own byelaws notified to Scottish Water.

Can an electric shower be installed without an electrician?

No. Beyond the obvious danger, the zones around a bath or shower are treated as a special location in the building regulations, and in England an addition or alteration to existing circuits in a special location must be notified to a building control body. The usual route is an installer registered with a competent person scheme who self-certifies the work. Scotland uses a building warrant system and Northern Ireland has its own arrangements, so check locally rather than assuming the English position.

Sources

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

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What affects the cost of shower plumbing

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

Type of problem and how easy it is to find
Access to pipes behind walls, under floors or underground
Parts and fixtures chosen
Age and material of the existing pipes
Emergency, evening or weekend service
Permits and inspections, where required

How to compare plumbers before you hire

Hire a plumber who is licensed for this work in your area, especially for gas water heaters, sewer lines and new plumbing.
Ask whether they charge a flat rate or by the hour, and what the call-out fee covers.
For leaks and drain problems, choose someone who explains the cause and doesn't only clear the symptom.
Get the scope in writing for larger jobs such as a water heater, sewer repair or re-piping.
If it's urgent, ask how soon they can arrive and whether after-hours rates apply.

Questions to ask plumbers before you hire

Are you licensed for plumbing work in my area?
Do you charge a flat rate or by the hour, and is there a call-out fee?
What do you think is causing the problem?
Will this work need a permit or an inspection, and who will arrange it?
Will you need to open walls, floors or the yard to reach the problem?
What warranty do you offer on parts and labour?

When to call a pro for shower plumbing

An active leak: shut off the main water valve if you can reach it safely, then call a plumber.
Sewage backing up into drains or the basement
No hot water, or water pooling around the water heater
Pipes that may have frozen during a cold snap

Shower plumbing permits and local rules

Some shower plumbing work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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