A tub to shower conversion removes a bathtub and builds a shower in its place. It sounds simple. In practice, it touches plumbing, waterproofing, tile, glass, and ventilation. This guide walks through each part, so you can discuss scope with a provider in plain terms.
Start with the reason
A conversion starts with a reason, not with a tile sample. You may shower daily and bathe rarely. You may find the tub edge hard to step over. You may want a seat and a handheld head. You may want a shower that is easier to clean than a tub surround with many joints. Write the reason down. It will guide choices about entry height, seat type, and glass.
A conversion may not fit every home. A home with only one bath and no other tub needs a second thought. A home where the tub footprint gives a very small shower needs a measure first. A home where the drain must move a long way needs a budget check first. A provider can test those limits with a visit and a measure.
Measure the tub space
Measure the tub alcove length and width. Measure the height from floor to tub edge. Measure the door swing and the toilet clearance. Note the drain location. Note the valve location. Note the window location, if any. Photos help, but measurements help more. A provider needs numbers to price a base, a glass panel, and a tile layout.
Check the wall type too. Tile over plaster, tile over drywall, and tile over a cement board base behave differently during demo. Check the floor type. A concrete slab, a wood joist floor, and a tile floor each affect drain work in a different way. Tell the provider about past leaks near the tub. A past leak can point to a wall or floor problem that demo will expose.
Drain and plumbing
The drain is the core decision. A tub drain sits at one end of the tub. A shower drain sits where the shower floor slopes to it. In some conversions, the old drain can serve the new shower with minor work. In others, the drain must move. A drain move can mean cutting a floor, rerouting a pipe, and patching the floor. That adds labor and inspection time.
The shower valve also matters. A pressure balanced valve helps keep temperature steady when another tap runs. A thermostatic valve offers finer control, at a higher cost. A handheld head on a slide bar helps seated use and cleaning. A fixed head alone can be hard to use for seated showering. Choose a valve and head for daily use, not just for looks.
Water supply lines should be checked during demo. Old galvanized lines, corroded valves, and weak shut offs are common finds in older homes. A provider should tell you how those finds will be priced. A shut off that fails during work can flood a room fast. A provider who checks shut offs before demo is planning well.
Waterproofing and base
Waterproofing is the layer that keeps shower water out of walls and floors. It sits behind tile and under the shower floor. It is easy to skip in a quote and hard to fix after tile goes in. Ask the provider to name the waterproof product type and the areas it will cover. Ask how corners, drain joints, and wall to floor joints will be sealed. Ask how the layer will be checked before tile goes in.
The shower base sets the slope. A factory base has a built in slope to the drain. It offers a set size and a predictable install. A tiled base is built on site with a slope to the drain. It offers a custom size and a matched tile look. It needs skilled work to get the slope right. A flat spot on a tiled base will hold water. A low spot near a wall can push water toward a joint. Ask the provider to explain the slope plan in plain terms.
Curb height is part of the base plan. A high curb keeps water in, but it adds a step. A low curb eases entry, but it needs a careful slope and glass plan to keep water inside. A barrier free entry has no curb, but it needs a floor slope and drain plan that a low curb job may not need. Tell the provider about mobility needs early. The curb choice depends on it.
Tile, glass and fixtures
Tile choice affects labor time and cleaning. Large wall tile can be faster to set and gives fewer grout lines. Small mosaic tile on a shower floor can add grip and suit a slope, but it takes more time to set. Porcelain tile suits wet areas well. Natural stone needs sealing and care. Grout color affects cleaning and leak spotting. Dark grout can hide stains. Light grout can show dirt sooner, which can help you spot a problem early.
Glass choice affects water control and cleaning. A fixed panel with an opening suits a large shower. A hinged door needs swing space. A sliding door suits a tight room. A curtain suits a budget job and a small space. Glass thickness and hardware quality affect how the door feels each day. Ask about cleaning access for each option. A glass panel that cannot be reached for cleaning will look streaked fast.
Fixtures complete the job. A seat can be built in, fold down, or freestanding. A built in bench suits a large shower. A fold down seat suits a small shower and keeps floor space clear. Grab bars should be fixed to blocking in the wall, not just to tile. Ask where blocking will go. Ask for bar locations on the plan before tile goes in.
Ventilation and finishes
A new shower needs a fan that vents outside. A fan that vents into an attic or a wall cavity can push moist air into a hidden space. That moisture can feed mold and rot. Ask where the fan vents to. Ask about fan size for the room size. Ask about a timer or humidity control. A fan that runs after a shower helps dry the room.
Finishes outside the shower matter too. Paint, trim, and caulk near a shower need to handle moisture. A provider should seal joints at the shower edge, the vanity, and the floor. A caulk line that is neat and full will last longer than a thin line with gaps. Check seals after the job. Run the shower and watch corners and glass seals for leaks.
Timing, cost and permits
Timing depends on drain moves, tile choice, glass type, and building rules. A simple conversion with a drain in place can move faster than a tiled base with a drain move. Permit review, material delivery, and inspections add time. Condo and co-op buildings may set work hours and elevator rules. Ask for a written schedule with milestones, not just a start date.
Cost follows the same drivers. Drain moves drive cost most. Tile and glass drive cost next. Building charges and permit fees add to the total. Ask for a scope that lists demo, plumbing, waterproofing, base, tile, glass, and fixtures as separate lines. That split helps you compare providers on the same job.
Permits vary by city and by building. A conversion that moves plumbing, changes wiring, or moves a wall may need a permit. A simple swap in place may need less review. Ask the provider to confirm the permit route for your exact plan. This guide does not give legal advice. The local permit office is the source for a ruling on your address.
Questions to ask a provider
Ask these questions on the first call. What is the drain plan? How will waterproofing be checked before tile? What is the curb height and entry step? What base type suits my drain and budget? Where will grab bar blocking go? Who files permits, if permits apply? How will demo surprises be priced? What is the payment schedule?
Take notes on each answer. Compare scopes line by line, not just totals. A provider who explains drain, slope, and waterproofing is planning a shower that will last. A provider who talks only about tile color may miss the core job.
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Common questions
How long does a tub to shower conversion take on site?
Time on site depends on drain location, tile choice, glass type, and building rules. A conversion with a drain in place and a factory base can take less time than a tiled base with a drain move. Permit review and material delivery add time before work starts. Ask the provider for a written schedule with milestones.
Can I keep the same footprint when I convert a tub to a shower?
In most cases, yes. The shower sits where the tub stood. That footprint sets the shower size. A larger shower needs a wall move, which changes scope and permit needs. A provider should measure the tub alcove and test the entry path. A shower that is too small to turn in will not feel safe or useful.
What is the most common mistake in a tub to shower conversion?
The most common mistake is weak waterproofing behind tile. A shower that looks fine can leak into walls and floors if the waterproof layer fails. Ask the provider how waterproofing will be checked before tile goes in. Ask about drain slope, corner seals, and glass seals. Those checks matter more than tile color.
Should I choose a factory base or a tiled base?
A factory base offers a set size and a built in slope, which can speed install. A tiled base offers a custom size and a matched look, but it needs skilled slope and waterproof work. Choose by drain location, cleaning habits, and budget. Ask the provider to price both options where the choice is close.