Can a shower really be fitted in a day in London?

Yes, for most common jobs. A like-for-like electric shower swap takes 2–4 hours; a thermostatic mixer shower replaced onto existing pipework is about half a day; and a bath-to-shower conversion can be completed in a day if it reuses the existing tiled recess and waste position. What cannot be done in a day is a full tiled wet room — the waterproof tanking membrane and any new screed must cure before tiling, so that's a 3–5 day job — or any install that needs fresh tiling, a moved soil or waste pipe, or a booster pump added to a low-pressure gravity system. The honest test is whether the wall, waste and water/electrics already exist where the new shower needs them. If they do, it's a one-day fit; if they need moving, it isn't.

How much does it cost to fit an electric shower in London?

In 2026, fitting a customer-supplied electric shower as a like-for-like replacement in London typically costs £180–£350 in labour, finished in 2–4 hours. If the unit needs a new dedicated electrical circuit run back to the consumer unit — rather than reusing the existing shower circuit — add £200–£450 for the electrical work, because that is notifiable under Part P and needs certifying. A higher-kW unit (10.8kW) may need a thicker cable and a 45–50A breaker, which costs more than swapping a like-for-like 8.5kW. The shower unit itself is on top: a decent electric shower is £90–£300 retail. Always get the labour quoted as a fixed price and confirm whether a Part P certificate is included.

Can you convert a bath to a shower in one day?

Often yes — if you reuse the existing tiled wall and the waste can stay where it is. Removing the bath, fitting a shower tray and enclosure (or a walk-in panel) onto the existing tiled recess, and connecting an electric or mixer shower is a realistic one-day job for an experienced plumber. It stops being a one-day job the moment retiling is involved (tile adhesive and grout need curing time), or the waste needs relocating to suit a new tray position, or the floor needs levelling. A bath-to-shower conversion in London runs roughly £900–£2,500 depending on the tray, enclosure and whether any tiling is needed. If you want a fully tiled, level-access wet room rather than a tray, that's a separate, multi-day project.

Why is my shower pressure so low, and can a pump be fitted the same day?

Low shower pressure in older London homes usually means you're on a gravity-fed system: a cold tank in the loft and a hot cylinder in the airing cupboard, giving only the head of water above the shower. A shower pump can transform it, and fitting one to an accessible cylinder and tank is often a same-day job. The important rule is that you cannot legally run a pump directly off the incoming mains under the Water Supply (Water Fittings) Regulations 1999 — a pump must draw from a stored supply (the tank/cylinder) or via a break tank/accumulator, to protect the public water supply from being drawn down. If you're on a combi or unvented cylinder you already have mains pressure and a pump usually isn't needed (or allowed off the mains). The right fix depends on your system, which is the first thing a plumber checks.

Does fitting an electric shower need Building Regulations approval?

Yes. An electric shower draws a large current and sits in a bathroom — one of the special locations covered by Part P of the Building Regulations. Installing a new circuit for it, or working on the electrics in the bathroom zones, is notifiable work that must be done by a competent person and certified (either self-certified by a registered electrician through a scheme like NICEIC or NAPIT, or notified to building control). The circuit must be RCD-protected, correctly sized in cable and breaker for the shower's kW rating, and isolated by a pull-cord or an isolator outside the bathroom. A like-for-like swap onto a sound existing circuit is lower-risk, but the safe, compliant route is always an installer who can issue the electrical certificate. Don't accept a cash-in-hand electric shower fit with no paperwork.

Why do electric showers and mixer cartridges fail so fast in London?

Hard water. Central and north London sit on the hard Thames Water supply, and the dissolved calcium scales up the heating element inside an electric shower and the thermostatic cartridge inside a mixer shower. Scale on an electric element makes the shower run lukewarm then cut out; scale in a mixer cartridge makes the temperature wander and the flow drop. You can slow it down considerably: fit a scale-reducing showerhead (about £20), descale the head and hoses every few months by soaking them in a citric-acid or vinegar solution, and run an annual service on a mixer cartridge. When an element or cartridge does finally fail it's usually a quick same-day repair rather than a full replacement — worth a call before you assume the whole unit needs swapping.

Showers Fitted in a Day in London: Electric, Mixer, Wet Rooms — What's Realistic and What It Costs (2026)

Which showers can genuinely be fitted in a day in London — electric, mixer and bath-to-shower swaps — what counts as a one-day job, the regs, and 2026 costs.

"Showers fitted in a day" is one of the most-searched phrases in London plumbing — and for good reason. A broken shower is a daily-life problem, and nobody wants a bathroom out of action for a week. The good news is that most ordinary shower jobs genuinely are a same-day fit. The catch is that "shower installation" covers everything from a 20-minute electric-shower head swap to a five-day tiled wet room, and the gap between what's realistic in a day and what isn't is exactly where people get caught out. This guide sets out, honestly, which London shower jobs are a one-day fit, which aren't, what the regulations require, and what it all costs in 2026.

What "Fitted in a Day" Actually Means

The single question that decides whether a shower is a one-day job is this: do the wall, the waste and the water (and electrics) already exist where the new shower needs them? If the answer is yes, almost any shower can be fitted in a day. If the answer is no — if the waste has to move, the wall needs retiling, or a new electrical circuit has to be run — then you're into a multi-day project no matter what the advert says.

That's because the slow parts of a bathroom are never the plumbing. Connecting a shower to existing pipes is fast. What takes time is anything that has to cure: tile adhesive, grout, and above all the waterproof tanking membrane in a wet room. A plumber can fit a shower in two hours; a tiler's adhesive can't be rushed. So when you see "fitted in a day," read it as "fitted in a day where the bathroom is already set up for it" — which, for a like-for-like replacement, is usually true.

The Shower Types and Which Are One-Day Jobs

There are four common shower types in London homes, and they sit very differently on the one-day scale:

Electric shower (one-day, often half-day). Heats its own water on demand from the cold mains, so it doesn't depend on your boiler or hot water at all — which is why it's the go-to for a second bathroom or an en-suite. A like-for-like swap onto the existing circuit and pipe is a 2–4 hour job. The kW rating matters: 8.5kW is entry level, 9.5kW is standard, and 10.8kW gives the best flow but needs a thicker cable and a bigger breaker.
Thermostatic mixer shower (half to one day). Blends stored or mains hot and cold water and holds a steady temperature. Replacing one onto existing concealed or exposed pipework is half a day. It needs adequate pressure to work well — fine on a combi or unvented system, marginal on a low-pressure gravity setup without a pump.
Power shower (one day). A mixer shower with a built-in pump, used on gravity-fed systems to force the flow. A one-day fit where the pipework is accessible, but only suitable for stored-water (tank-fed) systems, not combis.
Digital / smart shower (one day). A processor-controlled mixer with a remote control unit. The fitting itself is a day where the pipework exists; the cost is mostly in the unit.

For the great majority of London replacement jobs — a dead electric shower, a leaking mixer, a tired power shower — the install is comfortably a same-day visit. The variable is almost never the shower; it's the state of what's behind the wall.

Bath-to-Shower Conversions

Swapping a bath for a shower is one of the most popular London bathroom changes, especially in small flats and for older residents who want step-in access. Whether it's a one-day job comes down to the same test as above. If the bath sits in a tiled recess, the waste can stay roughly where it is, and you're fitting a shower tray and enclosure (or a walk-in glass panel) in the bath's footprint, an experienced plumber can rip out the bath and have a working shower in by the end of the day.

It stops being a one-day job the moment tiling enters the picture. New tiles mean adhesive and grout that have to cure overnight before the shower can be used, so a conversion that involves retiling the recess becomes a two- or three-day job. The same applies if the waste needs relocating to suit a new tray position, or if the floor under the old bath needs levelling and reinforcing for a low-profile tray. A realistic London price for a bath-to-shower conversion is £900–£2,500 depending on the tray, the enclosure and how much tiling is involved — and the honest installers will tell you on the survey whether yours is a one-day or a three-day version before they start.

Wet Rooms: Why They Aren't a One-Day Job

If you've been promised a fully tiled, level-access wet room "in a day," be very careful. A wet room is a fundamentally different build from a tray-and-enclosure shower. It needs the entire shower area — and usually the whole floor — made completely watertight with a tanking membrane, the floor formed to fall towards a drain (often with new screed), and then the whole thing tiled. Every one of those layers has to cure before the next goes on. Skip the dry time and the tanking fails, water tracks into the structure, and you get exactly the kind of hidden leak that needs a leak detection survey to find six months later — often in the flat below.

A properly built wet room in London is a 3–5 day job and costs £4,000–£8,000 or more, depending on size, tiling and whether underfloor heating goes in. In a flat or mansion block there's an extra dimension: you are creating a wet area directly above someone else's ceiling, so leaseholders almost always need freeholder or managing-agent consent, and the waterproofing standard matters enormously. A wet room done right is superb; a wet room rushed into a single day is a flood waiting to happen.

The Regs: Part P, Water Fittings and Pumps

Two sets of rules govern a London shower install, and a good installer treats both as non-negotiable.

Part P of the Building Regulations (electrical). A bathroom is a "special location," and an electric shower draws a heavy current, so fitting one is notifiable electrical work. The circuit must be its own dedicated, RCD-protected supply, correctly sized for the shower's kW (a 10.8kW unit can pull 45A+, needing the right cable and breaker), and isolated by a ceiling pull-cord or an isolator switch outside the room. The work must be done by a competent person and certified — either self-certified by an electrician registered with a scheme such as NICEIC or NAPIT, or notified to building control. A like-for-like swap onto a sound existing circuit is the lowest-risk version, but you should always end up with paperwork. Treat a "cash, no certificate" electric shower fit as a red flag.

Water Supply (Water Fittings) Regulations 1999 (plumbing). These protect the public supply from contamination and over-draw. The one that catches people out with showers: you cannot run a booster pump directly off the incoming mains. A shower pump must draw from stored water (the loft tank and hot cylinder) or through a break tank or accumulator — pulling hard on the mains would risk drawing down a neighbour's supply. So if a salesperson offers to "just pump the mains" to fix your pressure, they're offering you a regs breach. The compliant fixes are a pump on a stored system, or, if you want mains pressure throughout, a switch to a combi or unvented cylinder — a bigger job, but the correct one.

2026 London Cost Guide

Indicative London labour pricing for 2026, from our own job log. Shower units are extra and vary widely by brand. Every job should be quoted as a fixed price after a quick survey or a few photos.

Job	Typical London cost (2026)	One-day?
Electric shower — like-for-like swap (labour)	£180–£350	Yes (2–4 hrs)
Electric shower — with new dedicated Part P circuit	£380–£800	Usually yes
Thermostatic mixer shower — onto existing pipework	£250–£500	Yes (half day)
Shower pump fitted to gravity system	£350–£650	Usually yes
Bath-to-shower conversion (reusing tiled recess)	£900–£1,600	Yes
Bath-to-shower conversion (with retiling)	£1,500–£2,500	No (2–3 days)
Tiled level-access wet room	£4,000–£8,000+	No (3–5 days)
Electric shower / mixer cartridge repair (descale or part)	£90–£200	Yes

A rule of thumb: anything that's a swap onto existing services sits at the bottom of those ranges and is a same-day fit; anything that moves services or adds tiling moves up the table and off the one-day list. The cheapest surprise to avoid is paying a "one-day" price for a job that was always going to take three.

What Delays a "One-Day" Shower

Five things turn a same-day fit into a return visit, and a decent installer flags them on the survey rather than discovering them mid-job:

Hidden corrosion or seized valves. In older Victorian and Edwardian London plumbing, the isolation valves feeding the shower are often seized with limescale, so the first job is sometimes replacing those before the shower can even be connected.
The pressure is wrong for the chosen shower. A mixer shower bought for a combi won't perform on a gravity system, and vice versa. Matching the shower to the system is step one — get it wrong and you're sending the unit back.
The electrics need upgrading. An old fuse box with no RCD, or a circuit too small for a higher-kW electric shower, means electrical work before the shower goes in.
Tiling or waste moves are needed. The single biggest "it's not actually one day" trigger — anything that has to cure or be relocated.
Access and consent in flats. In a mansion block or leasehold flat, water above another home can need managing-agent sign-off, and porter or lift logistics slow the day.

Choosing a London Installer

A few things separate a clean same-day shower fit from a botched one:

They survey before they quote. A photo or a five-minute look tells a good plumber whether yours is a one-day job. A fixed price should follow, not an open-ended day rate.
They can certify the electrics. For an electric shower, the installer should either be a registered electrician or work with one who issues the Part P certificate. No certificate, no job.
They match the shower to your system. Ask them to confirm your system type (combi, unvented or gravity) and that the shower suits it, before you buy a unit.
They're honest about what isn't one day. An installer who tells you a wet room is a four-day job is protecting you from a failed tank; one who promises it in a day is not.
They fix as well as fit. If your shower problem is a scaled cartridge or a dead element, a repair is often cheaper than a replacement — a firm that does emergency plumbing first will tell you which you actually need.

Our own engineers fit electric, mixer, power and digital showers and handle bath-to-shower conversions across all 32 London boroughs, working with registered electricians for the Part P side and matching every shower to the property's system before anything is ordered. Where the job is a genuine same-day fit, we do it in a day; where it isn't, we tell you up front.

The Bottom Line

Most London shower jobs really can be fitted in a day: a like-for-like electric shower in a morning, a mixer shower in half a day, a bath-to-shower swap that reuses the tiled recess inside a single visit. What can't be rushed is anything that has to cure or move — a tiled wet room is a 3–5 day build, and a conversion that needs retiling runs to two or three days. Get the job surveyed, match the shower to your system, insist on a Part P certificate for anything electric, and treat London's hard water as the thing that will eventually kill your element or cartridge. Do that and "fitted in a day" is a promise that holds — for the jobs where it was ever realistic in the first place.