Wet Room Shower Doors & Frameless Sliding Glass: The FAQ I Wish I'd Had

I buy and spec glass shower enclosures for a 140-person fit-out contractor. About a third of my job is doors—the other two-thirds is arguing with vendors about freight. Below is the FAQ I wish someone had handed me six years ago, because I learned most of it the expensive way.

Here's what I cover, in case you want to jump:

• Wet room vs. regular shower room — does the door spec change?
• Frameless sliding doors — worth it, or just design hype?
• Framed vs. frameless bypass: the real installed cost gap
• Where tub glass door budgets actually break
• The one code point that ends more installs than anything else
• When a wet room is the wrong call
• Sliding frameless tub door vs. bypass — how to pick
• Comparing three quotes without getting burned

Wet room vs. regular shower room — does the door spec change?

Yes, but not in the way most people expect. The shower tray is gone in a wet room, so the whole floor is the drain. That changes two things: you need a door with enough bottom clearance to not scrape the slope, and you need a sweep that handles constant splash rather than occasional overspray. A standard bypass kit—the kind that assumes a curbed base—usually fails there. I've had installers shim the track and it looked fine for a month. Two, actually—closer to five weeks—and the corners started weeping. For wet rooms I default to a semi-frameless or frameless sliding panel with a proper sweep and a floor guide, not a track sitting on what used to be a curb.

Frameless sliding doors — worth it, or just design hype?

Somewhat depends on what you mean by 'worth it.' When I compared two identical bathrooms side by side—same tile, same layout, one framed, one frameless—the difference wasn't cosmetic. The frameless version had no bottom track to trap soap scum, which is the single biggest complaint we log on service calls. That's the insight, really: frameless isn't a luxury aesthetic here, it's easier to clean. The trade-off is alignment. Frameless panels are heavier, and if the wall isn't true within about ⅛ inch over the panel run, the door sags or the gap gaps. So yes—worth it, if your framing crew is honest about plumb. Not worth it if they're not.

Framed vs. frameless bypass — what's the actual cost gap?

At the product level, frameless runs roughly 2 to 2.5x a framed bypass for the same opening width and glass thickness. That's the number everyone sees. What they miss is install time. A framed bypass is a one-person, 90-minute job. A frameless sliding door is a two-person job with leveling, shimming, and a return visit if the hinge side drifts. On our own cost tracking across about 180 orders, the installed gap lands closer to 3x, not 2x. That matters—'frameless' quotes that look competitive on paper stop being competitive once your installers bill for the second trip. I've watched this kill a value-engineering plan twice, and both times we ate the difference.

Where do tub glass door budgets actually break?

Not on the glass. On the surprises. I assumed for years that a 'standard' tub glass door was standard, and that took one order to correct: two vendors quoting the same nominal width had different tolerances on the tub ledge, and one required a header bar the other didn't. The quote looked $180 cheaper until the header, the drill template, and the custom sizing fee landed. Total delta: about $640 on a nine-unit job. Since then our purchase orders require three numbers on every tub glass door quote: rough opening, tub ledge width at three points, and whether the quote includes a header. If a supplier can't give me those, I don't send the PO. That's not arrogance, it's scar tissue.

The code point that ends more installs than anything else

Safety glazing. Every glass panel in a shower or tub enclosure in the US has to meet CPSC 16 CFR Part 1201, and the industry shorthand is ANSI Z97.1 or SGCC certification. That's not a 'good brands do this' thing—it's a legal requirement. What catches people is the application: it applies to the panel, not the assembly. So if you're sourcing a glass-and-hardware kit from a vendor who treats the glass as a commodity, ask for the SGCC mark on the pane itself. Etched, not stickered. I've watched a job get red-tagged because the certification was on a sticker that peeled off during installation. To be fair, most reputable suppliers know this. But 'most' isn't 'all,' and a red tag costs you a full re-glaze.

When is a wet room the wrong call?

I recommend wet rooms for most residential renovations where the floor can take a full slope and the client wants the open look. If any of these are true, I'd push back:

• The subfloor is timber and the client won't pay for a proper cement board and membrane build.
• The bathroom doubles as a powder room—guests will walk on a wet floor.
• There's no mechanical ventilation and the client won't add it.
• They want a tub and a wet room in the same footprint under 50 sq ft.

None of that means a wet room is bad. It means it's the wrong room for that job. I'd rather tell a client that in week one than in month four, when the tile is already up and the door is the only variable left.

Sliding frameless tub door vs. bypass — how do I pick?

Two questions decide it. First: do you need to reach into the tub from both sides? If yes, bypass. Second: is the tub ledge flat and wide enough to carry a bottom guide? If not, sliding frameless. For most of the tub-glass-door requests I see, the honest answer is bypass unless the client is specifically after the frameless look, because bypass is cheaper, simpler, and easier to service. I've installed sliding frameless tub doors where the ledge was tiled unevenly and every panel had to be re-cut. That was a $400 mistake I don't repeat. Looking back, I should have measured the ledge myself instead of trusting the tile sub's 'it's flat.' At the time I assumed a verbal OK was enough. It wasn't.

How do I compare three quotes without getting burned?

The lowest quoted price is very rarely the lowest total cost. Ask every vendor for four lines: unit price, freight, install time (or install cost), and warranty labor. Then ask what voids the warranty—this is where 'no maintenance' claims fall apart. Most glass door warranties exclude damage from common cleaning products, which means the client's usual bathroom spray can void coverage. Put that in writing, both ways. The vendor who resists giving you those four lines is usually the vendor who will cost you the most later. That's not pessimism, that's a pattern I've tracked across 200+ orders and still check every time.