Key Takeaways:
- A standard alcove tub leaves a 60-inch opening, which is wide enough for a hinged door with a fixed panel or a frameless slider.
- Glass cannot hide an out-of-plumb wall, so framing, backing, and curb pitch are checked before templating and the glass and hardware are specified to absorb what is found.
- Final templating happens against finished tile, never against open studs, and the quote follows that measurement.
Pulling out a tub is the easy part of a bathroom conversion. The harder decisions come after demolition, when the opening is bare and the door choice starts driving tile layout, curb height, and where the shower head can point. Homeowners who settle the glass plan early tend to end up with a cleaner install and fewer change orders.
The crews at IDEAL Shower Doors see tub conversions every week across the North Shore and southern New Hampshire, and the same handful of details decide whether the finished shower feels custom or compromised. This guide walks through the door decisions in the order they actually come up on a job, from opening width to the frameless shower door styles that fit a former tub alcove.
What the old tub alcove gives you to work with
Most alcove tubs sit in a 60-inch by 30-inch or 32-inch space with walls on three sides. That footprint converts well, because 60 inches of width supports a comfortable entry with room left for a fixed panel.
Height is the second variable. Once the tub deck is gone, the new pan or curb sets the floor level, and the glass height follows from there. Taller glass looks better in rooms with high ceilings and adds weight that the hinge package has to carry.
Plumbing position decides the rest. Moving the valve to a side wall keeps a person out of the cold spray at startup and opens the entry wall for glass. Leaving the valve where the tub filler was is cheaper and workable, though it usually narrows the door options.
Door styles that suit a converted tub space
A hinged door with an inline fixed panel is the most common answer for a 60-inch opening. The panel covers the wet zone near the shower head, the door handles the entry, and water control stays predictable.
A barn-style frameless slider fits rooms where a swing would collide with a vanity or a linen door. The glass runs on a top-mounted track, so no floor space is lost to a swing radius, and the tradeoff is track cleaning as part of the routine.
A splash panel or support panel suits a long walk-in layout with no door at all. Water containment then depends on the pan slope, spray direction, and panel length, so the design has to be right the first time.
Which style handles water best?
A hinged door with a fixed panel and a properly cut sweep gives the tightest water control of the three. Frameless enclosures minimize splash-out rather than sealing the opening, so a walk-through layout needs a longer panel and a shower head aimed away from the entry.
Glass thickness, hardware, and weight
Three-eighths inch tempered glass is the trade standard for most frameless doors and covers the majority of tub conversions. Half-inch glass is a heavier upgrade that changes hinge selection, clamp sizing, and the backing needed inside the wall.
Weight drives the hardware conversation. A tall door in thicker glass needs hinges rated for the load and solid blocking behind the tile, which is a decision made during framing rather than after tile goes up.
Finish is where personal taste comes back in. Chrome and brushed nickel stay quiet in the room, matte black and bronze become a feature, and the handle is the piece touched every day. Coordinating the door hardware with the shower trim keeps a converted alcove from looking pieced together.
Curb, threshold, and the details installers check
Curb pitch matters more than curb height. A curb that slopes outward sends water toward the bathroom floor no matter how good the glass is, so pitch gets verified before templating.
Wall plumb is checked at several points from top to bottom. Older homes around Danvers and the surrounding towns often run out of plumb by a quarter inch or more across a shower opening, and frameless glass shows every bit of it. Homeowners planning a conversion can see finished examples on the Danvers, MA shower door page.
Backing is the quiet one. Hinges need solid material behind the tile, and adding it after the tile is set means cutting into finished work. A short conversation before the tile order prevents that entirely.
FAQs
Is converting a tub to a walk-in shower worth it?
For a household that never uses the tub, the conversion turns dead space into daily-use space and usually improves how the room feels. Families keeping one bathtub in the home for resale often convert the primary bath and leave the hall bath alone.
Do I need a curb or can the shower be curbless?
Both work. A curbless pan gives the flattest look and depends on correct floor slope and drain placement, and the framing has to allow the pan to recess into the floor structure.
What size shower do I get from a standard tub space?
A 60-inch by 30-inch alcove gives a generous single shower. New Hampshire’s code sets 900 square inches with a 30-inch least dimension, and Massachusetts requires a 32-inch by 32-inch rough-in, so a 30-inch-deep alcove meets New Hampshire and sits at the Massachusetts limit on depth.
When should the glass company measure?
Final measurement happens against finished surfaces after tile is set and grouted. Earlier site visits are design walkthroughs, useful for confirming backing and valve placement, and no glass is ordered from them.
How long does the glass part of the project take?
Fabrication starts after the final measurement, and the shop confirms the schedule when the glass and hardware are selected. Custom notches, thicker glass, and specialty finishes extend lead time.
Turning the alcove into a shower you actually like
A tub conversion succeeds on decisions made before the tile order: door style, glass thickness, curb pitch, and where the water goes. Get those right and the glass install is the calm part of the project.
The team measures against finished tile, checks plumb and backing at multiple points, and prices the enclosure around the real opening rather than a catalog number. That is why converted alcoves come out looking planned instead of patched.
Reach out to us today for a free consultation and we will review your opening and the door styles that fit it.
