The Order Matters More Than the Budget
People planning a bathroom remodel typically think in terms of what they want — new tile, new vanity, better fixtures — rather than the sequence in which those things need to happen. But bathroom renovations are one of the most sequence-dependent projects in home improvement, where doing the right thing in the wrong order creates expensive problems that require undoing work you’ve already paid for.
This guide is about the why behind each step’s position in the sequence — not just the what.
Step 1: Address Any Existing Water Damage Before Anything Else
Before a single tile is purchased or a vanity is selected, probe the existing walls and floor for moisture damage. A cheap moisture meter (under $20) tells you what years of water exposure may have done to the substrate. Soft spots in the subfloor near the toilet or tub, discoloration on walls, or visible mold are all signals to stop and assess before adding new finishes on top of damaged structure.
Finishing over moisture damage is the most expensive mistake in bathroom renovation. A failed subfloor discovered after new tile is installed requires tearing up the new tile, repairing the floor, and re-tiling. Discovering it before you start costs nothing extra.
Step 2: Rough Plumbing and Electrical Relocations
If you’re moving the toilet, shifting a shower drain, adding a double vanity where a single one existed, or relocating electrical outlets — all of this must happen while the walls are open and before any finishes go in. This seems obvious, but many people purchase the tile first, fall in love with a layout, and then discover their planned location conflicts with existing plumbing runs.
Draw your planned layout first, have a plumber and electrician walk through it before you order anything, and get their input on what’s feasible without major rerouting. Then order materials.
Step 3: Install Cement Board (or Waterproofing Membrane) Before Any Tile
Standard drywall — including ‘moisture resistant’ green board — is not appropriate as a substrate behind shower tile. It absorbs water when grout and caulk fail (which they always eventually do), promoting mold growth and structural decay. Cement board or a liquid waterproofing membrane over cement board is the correct substrate for any wet area.
Skipping this step to save money is one of the most common and most expensive bathroom renovation mistakes. A shower that looks beautiful for three years and then requires complete gut and retile because the substrate is failed is far more expensive than the cost of doing it right the first time.
Step 4: Tile Floors Before Tile Walls
Floor tile goes in before wall tile. This sequence allows wall tile to land on top of the floor tile surface, covering the floor tile’s edge — a cleaner finish detail. Doing it in reverse (walls first, then floor) leaves the floor tile edge exposed and requires additional trim pieces or a less clean termination.
The exception is shower wall tile, which should lap down and terminate above the shower floor, with a bead of flexible caulk (not grout) at the joint. This caulk joint — not grout — at every change-of-plane is what allows the substrate to flex without cracking.
Step 5: Vanity and Fixtures After Tile, Before Paint
Install the vanity after tile work is complete. This way, the tile floor runs under the vanity (or just to it, if the vanity will be permanent and large), and any cutting of tile for plumbing penetrations is done with the final fixture measurements in hand.
Painting is the last thing that happens — after all trade work is done, all fixtures are installed, and all surfaces are complete. Painting before fixtures means touching up around every plumbing and electrical installation. Painting last creates a clean, professional finish in one pass.