Most timeline estimates you find online are close to useless, because they answer a question nobody actually asked. "Two to three weeks" describes a cosmetic refresh. It has almost nothing in common with a renovation that relocates plumbing.
The useful question is narrower: what does your scope require, and which parts of it can run in parallel?
What actually drives the schedule
Four things account for most of the variation.
Whether plumbing moves. Keeping fixtures in their existing positions removes an entire phase. Relocating a toilet or converting a tub to a walk-in shower means opening the floor, running new supply and waste, and — depending on jurisdiction — an inspection before anything gets covered.
Whether the substrate survives. This one is genuinely unknowable until demolition. A bathroom that has been leaking quietly behind the tile needs the substrate replaced before waterproofing can begin. Nobody can tell you in advance whether that applies to your bathroom.
Material lead times. Tile, vanities, and glass enclosures are ordered, not collected. A custom glass panel is templated after the tiling is finished, which means the measurement cannot happen early. That gap sits in the middle of the schedule regardless of how efficient everything else is.
Inspection scheduling. Where inspections are required, their timing is set by the inspector's calendar, not the contractor's. This is a common source of apparent delay that no amount of site efficiency will remove.
Why the phases cannot all overlap
Bathrooms are small and trade-dense, which is an awkward combination. Only one trade can realistically work in the room at a time, and several phases have hard dependencies:
- Waterproofing cannot start until the substrate is sound
- Tiling cannot start until the waterproofing has cured
- Glass cannot be templated until the tiling is complete
- Final plumbing cannot be connected until the tiling is finished
Each of those is a sequence, not a scheduling preference. A larger crew does not compress them.
What to ask before you commit
Rather than asking how long it takes, ask for the sequence in writing:
- Which phases are planned, and in what order
- Which phases depend on an inspection
- Which materials have lead times, and when they must be ordered
- What happens to the schedule if the substrate turns out to be damaged
- How you will be told when something changes
A contractor who can answer those has thought about your project specifically. One who leads with a single number has not.
The honest summary
A cosmetic refresh that keeps the layout is a substantially shorter project than a renovation that moves plumbing. Beyond that, anyone quoting you a precise duration before seeing the space is guessing.
What you should expect is a written sequence, a clear list of the decisions that affect it, and notification when something changes.