How Long Does a Bathroom Take to Fit? 5 to 10 Working Days

How long does a bathroom take to fit? For a like-for-like replacement, where the bath, basin and WC stay roughly where they are, five to ten working days is the realistic window from strip-out to a room you can use. Move the soil pipe, take out a wall, or swap a bathroom for a wet room and you are into two to three weeks. The gap between those two numbers is not down to how fast the fitter works, and it is separate from what the job costs, which we break down in our new bathroom cost guide. It is down to how many separate trades have to come back, and how many curing times sit between them.

Below is the sequence a Kent bathroom fit actually follows, alongside our wider bathroom renovation guide, what each stage adds, and the three things that most often push a job past its quoted finish date.

Day by day: what happens in a straightforward bathroom fit

This is the common shape of a five to eight day job in an average family bathroom, with one fitter and a plumber and electrician in and out.

Day 1: strip out and make safe

Old suite out, tiles off, floor lifted where needed. Isolate the water and drop the electrical circuits. This is the day surprises appear: rotten floorboards under the bath, a hidden leak at the WC pan connector, or an old textured ceiling coating. Textured coatings applied before 2000 can contain asbestos and must be tested before anyone sands or scrapes them, which stops a job dead for a few days if it was not allowed for.

Day 2: first fix plumbing and electrics

Pipework is run to the new positions and capped, waste and soil connections are set, and cables are pulled for lighting, the extractor and any shaver socket or underfloor heating mat. Nothing looks finished at the end of this day, which is why homeowners often feel the job is behind on day two when it is not.

Day 3: boarding, tanking and floor prep

Walls are boarded and made flat, shower areas are tanked, and the floor is levelled or overboarded so tiles have something rigid to sit on. Deflection in a floor is the single most common cause of cracked grout a year later, so this is not a day worth compressing.

Days 4 to 6: tiling and grouting

The longest stage, and the one with a built-in wait. Tiles go on, the adhesive has to set, then grout goes in. On a full-height tiled bathroom this is rarely less than two days and often three.

Days 6 to 8: second fix and sealing

Suite fitted, brassware on, extractor wired and tested, shower screen up, silicone run last. Water is back on, the room is testable, and the fitter goes through the snag list.

The waits nobody can compress

Three of the delays in a bathroom fit are chemical, not human. They are worth understanding because they explain why a fitter cannot simply “do the tiling and the suite on the same day”.

A tiled and grouted bathroom awaiting second fix, with capped pipes where the taps will go — The same room tiled and grouted, waiting on second fix: the brassware goes on after the grout has set. | Grout is in by juhansonin (CC BY 2.0), via Flickr, https://www.flickr.com/photos/38869431@N00/3780368879

Tile adhesive. A standard-set cementitious adhesive such as BAL SPF S1 is rated to be grouted after 16 hours, with a five hour pot life. A rapid-set product such as BAL Supercover Rapidset can be grouted after 2 hours, but the open time drops to 20 minutes, which means less room for the fitter to adjust tiles as they go.
Silicone. A sanitary silicone such as DOWSIL 785 skins over in about 12 minutes at normal room conditions and reaches early water resistance after 2 hours, but full cure takes anywhere from 7 to 21 days depending on temperature, humidity and joint depth. You can shower that evening. Do not scrub the joint for a fortnight.
Screeds and levelling compounds. Where a floor has been screeded rather than overboarded, the drying time is set by the product and the depth, and it can add days rather than hours.

A fitter who quotes four days for a fully tiled bathroom is either using rapid-set products throughout, or is planning to grout over adhesive that has not set. Ask which.

What adds a week or more

The jobs that overrun are almost always the ones where the layout changed. In rough order of how much time they add:

Moving the WC. Everything else can be re-plumbed in 15mm or 22mm pipe. The soil connection cannot, and moving it usually means lifting floors, boxing a new run at a fall, or fitting a macerator. Add two to four days.
Converting to a wet room. A formed or cut-in floor former, full tanking of the floor as well as the walls, and a linear drain tied into the existing waste. Add three to five days.
Removing or moving a wall. Structural work brings in building control and, if the wall is shared, potentially a party wall notice with its own statutory notice periods. Add a week at least, and start the paperwork long before the fitter is booked.
A specified item on long lead time. The classic overrun. A made-to-order shower screen or a discontinued tile arriving in week three keeps the room out of use even though the work is done. Get every item on site before day one.

The paperwork that can stall a bathroom fit

Three separate regimes can apply to a domestic bathroom in England, and only one of them is likely to surprise you.

Part P, electrical safety. Since April 2013 in England, notifiable electrical work in a home is limited to installing a new circuit, installing a new or replacement consumer unit, and any alteration or addition to an existing circuit carried out in a special location. A room containing a bath or shower is a special location, but the notifiable zone is the space surrounding the bath or shower, not the whole room. In practice a new lighting circuit or a dedicated circuit for underfloor heating is notifiable and must be certified, either by a registered competent person or through a building notice to the council.

Part F, ventilation. The extract rate for a bathroom under Approved Document F is 15 litres per second for an intermittent fan, and where the room has no openable window the fan needs a run-on of at least 15 minutes after the room is vacated. Two useful details for a refurbishment: if there was no ventilation system in the original room, you are not obliged to add one, and replacing an existing fan on existing cabling does not need to be notified to building control. Note also that a new edition of Approved Document F has been published but does not take effect until 24 March 2027, so a bathroom fitted today is judged against the 2021 edition.

Water fittings regulations. Under regulation 5 of the Water Supply (Water Fittings) Regulations 1999, certain installations need advance notice to your water company. The one that catches bathroom projects is a bath with a capacity of more than 230 litres, measured to the centre line of the overflow, which covers a lot of freestanding and double-ended baths. Your supplier has ten working days to respond, and silence counts as unconditional consent, but if you order the bath the week before installation you may be waiting on a letter while the room sits empty.

How to keep the job on schedule

Everything on site before strip-out. Suite, tiles with 10% extra, adhesive, grout, screen, taps, wastes. Unboxed and checked for damage.
Agree the sequence in writing. Which days the plumber and electrician attend, and what the fitter does while adhesive sets.
Book the electrician’s certification, not just the electrician. A certificate that arrives three weeks later is a problem when you sell.
Allow a contingency day. Every fit uncovers something. A day of slack costs nothing if unused.
Keep a second WC available if you have one, or agree with the fitter which nights the WC will be reconnected.

Frequently asked questions

How long does a bathroom take to fit from start to finish?

Five to ten working days for a like-for-like replacement in an average family bathroom. Two to three weeks if the layout changes, the soil pipe moves, or the room becomes a wet room. Lead times on ordered items are separate and often longer than the fit itself.

Can a bathroom be fitted in three days?

Only a small shower room with limited tiling and rapid-set adhesive. A fully tiled bathroom cannot be tiled, grouted, fitted and sealed in three days without grouting over adhesive that has not reached its stated set time.

How long is a bathroom out of use during the work?

Typically from day one until second fix, so the whole of the fit. The WC can often be reconnected overnight in the first few days, but once tiling starts the room is usually out of action until the suite goes back in.

Do I need building regulations approval for a new bathroom?

Not for a straight replacement. Approval or a competent person certificate is needed where you install a new electrical circuit or consumer unit, do notifiable work around the bath or shower, alter drainage, remove a structural wall, or create a bathroom in a room that was not one before.

Should the plumber or the tiler come first?

First fix plumbing goes in before boarding and tiling, so pipework is buried and tile cuts land where they should. The plumber returns for second fix after grouting. A tiler working before first fix is a sign the job has been sequenced badly.

How long before I can use the shower after it is sealed?

Follow the sealant manufacturer’s figure. A sanitary silicone such as DOWSIL 785 reaches early water resistance after around two hours, but full cure can take up to three weeks, so avoid abrasive cleaners on fresh joints.

Sources

Approved Document P, electrical safety (GOV.UK)
Regulation 5, Water Supply (Water Fittings) Regulations 1999
Approved Document F Volume 1, ventilation, 2021 and 2026 editions, GOV.UK.
Manufacturer technical data: BAL SPF S1, BAL Supercover Rapidset, DOWSIL 785.

More bathroom costs, layouts and Kent trade guidance at Contemporary Structures.

How Long Does a Bathroom Take to Fit? 5 to 10 Working Days

Day by day: what happens in a straightforward bathroom fit

Day 1: strip out and make safe

Day 2: first fix plumbing and electrics

Day 3: boarding, tanking and floor prep

Days 4 to 6: tiling and grouting

Days 6 to 8: second fix and sealing

The waits nobody can compress

What adds a week or more

The paperwork that can stall a bathroom fit

How to keep the job on schedule

Frequently asked questions

How long does a bathroom take to fit from start to finish?

Can a bathroom be fitted in three days?

How long is a bathroom out of use during the work?

Do I need building regulations approval for a new bathroom?

Should the plumber or the tiler come first?

How long before I can use the shower after it is sealed?

Sources

Related guides