In short: A full bathroom installation takes 7 to 12 working days from strip-out to handover. A like-for-like replacement in an unchanged layout is often nearer seven; moving the toilet, forming a wet room or changing the layout pushes it to twelve or beyond. The bathroom itself is out of use for most of that time.
What's in this guide 6 sections
01 The realistic answer
A full bathroom installation takes 7 to 12 working days. That figure assumes one team working continuously — which is the single biggest variable, and the one most quotes do not mention.
Where a company subcontracts each trade, the same physical work can take three to six weeks of calendar time, because there are gaps between contractors. The plumber finishes on Tuesday, the plasterer cannot come until the following week, the plaster needs three days to dry, and by then the tiler has taken another job. None of that is extra work; it is all waiting.
02 Day by day: what actually happens
| Stage | Typical days | What happens |
|---|---|---|
| Strip-out | Days 1–2 | Old suite, tiling and flooring removed. Waste taken away. Floors and access routes protected. |
| First fix | Days 2–4 | Pipework re-run, new electrical circuits, extractor provision, any drainage alterations. |
| Plastering / boarding | Days 4–5 | Walls made good or re-boarded, wet areas tanked. |
| Drying | Days 5–7 | Plaster dries. Other work continues around it where possible. |
| Tiling | Days 6–9 | Floor and wall tiling, setting out planned before the first tile is fixed. |
| Second fix | Days 9–11 | Suite, brassware, shower, screens and lighting fitted and tested. |
| Finishing & handover | Days 11–12 | Silicone, joinery, snagging walk-through and final clean. |
03 What makes it take longer
- Moving the toilet or soil stack — this is drainage work, not pipework, and it is the single change most likely to add days as well as cost.
- Forming a wet room — floor works and tanking cure times add three to five days over a standard bathroom.
- Structural changes, such as removing the wall between a bathroom and a separate WC.
- Large-format tiles, natural stone, mosaic or herringbone layouts, all of which take substantially longer to lay than standard ceramic.
- Materials arriving late or wrong — the most common cause of delay on jobs where the customer supplies the suite.
- Finding failed pipework, rot or unsafe wiring behind the old bathroom. Not common, not rare either, especially in pre-1960s housing.
04 What makes it faster
- Keeping the existing layout. If the toilet, bath and basin stay roughly where they are, days come off immediately.
- Having everything on site before day one. Nothing costs more time than waiting for a delivery.
- One team doing every trade, so there are no gaps in the schedule.
- Deciding the details early — tile layout, brassware finish, where the shelf goes. Mid-job decisions stop work.
05 Will you be without a bathroom the whole time?
The bathroom itself will be out of use for most of the installation, typically 7 to 10 working days. If it is the only bathroom in the house, that is the part worth planning around rather than the total job length.
A good fitter will sequence the work to reconnect the toilet as early as is practically possible and tell you in advance which days will be the most disruptive. In older terraced housing with a single bathroom, some customers arrange to be away for the busiest few days. Ask about this at quote stage — the answer tells you a lot about how organised the company is.
06 Questions worth asking before you book
- Which trades are yours, and which are subcontracted?
- What is the working-day estimate, and what would make it longer?
- Which days will the toilet be out of use?
- Will everything be on site before you start?
- Who do I call if something goes wrong after completion, and how quickly can you get here?
The last one matters more than people expect. A fitter twenty-five miles away is far less likely to come back promptly for a snag than one from the next village, whatever they promise while quoting.
