A bathroom renovation can look simple right up until somebody starts opening walls. Then the surprises begin.
The floor is not level. The plumbing sits three inches from where the new shower drain needs to go. The wall that looked perfectly straight is, in fact, doing its own thing. And the glass door you saved on Pinterest cannot open without hitting the vanity.
This is why the contractor matters as much as the design. A professional custom glass company should be able to explain how the project will work before installation day, not improvise once the materials arrive. The same goes for the general contractor, plumber, tile installer, and anyone else touching the room.
You do not need to interrogate them for two hours. You do need to ask the right questions.
Have You Done This Exact Kind of Project Before?
“Do you have experience?” is too broad.
Almost every contractor will say yes.
Ask what they have installed that looks like your project. A frameless shower enclosure in a new luxury building is not the same job as fitting glass into an older bathroom with uneven tile and walls that have shifted over time.
The same applies to glass railings, mirrors, partitions, and custom doors.
Ask to see completed projects. Not only the polished professional photos either. Regular phone pictures can tell you a lot about how corners, hinges, seals, and awkward spaces were handled.
You are looking for proof that the contractor understands the messy middle part, not only the final reveal.
Who Is Actually Doing the Installation?
Sometimes the person who gives the estimate is not the person who shows up.
That is not automatically a problem. Larger companies have separate sales, measuring, fabrication, and installation teams. Still, you should know who is responsible for each stage.
Ask:
- Who takes the final measurements?
- Who fabricates or orders the glass?
- Are the installers employees or subcontractors?
- Who do you contact if something goes wrong?
The answer should be clear.
When everybody is “handling their own part,” problems have a habit of falling between those parts.
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How Will You Measure the Space?
Glass is not forgiving.
Tile can be trimmed. Paint can be touched up. A custom glass panel that is half an inch too wide is simply wrong.
Final measurements should usually happen after the surrounding surfaces are finished, especially when the glass needs to fit between tiled walls. Even a small change in tile thickness can affect the opening.
Ask when measurements will be taken and whether the contractor checks for walls that lean, floors that slope, or corners that are not perfectly square.
Because they often are not.
Older New York buildings, in particular, rarely offer the clean geometry shown in design software. A good installer expects that. A careless one discovers it late.
What Materials Are You Using?
Do not settle for “high-quality glass.”
Ask what that actually means.
For shower enclosures and railings, the contractor should explain the glass type, thickness, edge finish, and hardware. Tempered safety glass is commonly used because it behaves differently from ordinary glass if broken, but the full specification still depends on the application.
Hardware matters too.
Hinges, brackets, handles, channels, and fasteners need to suit the weight of the glass and the conditions around it. A bathroom is wet every day. An outdoor railing deals with weather, temperature changes, and wind.
The cheapest hardware may look fine when it is new.
Give it a year.
What Can Be Customized?
“Custom” gets used very loosely in renovation work.
Sometimes it means the panel is cut to fit. Sometimes it means you can choose almost every detail, from the door swing to the finish of the hardware.
Ask what can actually be changed.
For a shower enclosure, that may include:
- door placement and opening direction;
- fixed panels;
- glass thickness or texture;
- handle style;
- hardware finish;
- height;
- privacy options.
This is where practical decisions matter more than the prettiest showroom sample.
A large door may look impressive, but not if it blocks the toilet. Clear glass may open the room, but frosted glass could make more sense in a shared bathroom.
The contractor should help you catch those conflicts before anything is ordered.
What Happens Before Installation Day?
A good installation starts well before the glass arrives.
The contractor may need to check the tile, wall support, waterproofing, shower curb, and surrounding fixtures. If the glass is part of a larger bathroom renovation, the timing has to line up with the rest of the work.
Ask what must be finished first.
Also ask whether the glass installer needs blocking or reinforcement inside the walls. This is especially important for heavy doors, railings, benches, and grab bars.
Once the tile is finished, fixing hidden support becomes much harder. And much more expensive.
How Long Will the Project Really Take?
There are usually two timelines: the optimistic one and the real one.
Ask for both.
Custom glass may need to be measured, fabricated, finished, transported, and installed. That does not happen overnight. Bathroom renovations can also stall while waiting for tile, plumbing parts, permits, or another trade to finish.
Ask for a rough schedule with the main stages clearly separated:
- site visit and estimate;
- final measurements;
- fabrication;
- installation;
- curing or waiting time before use.
Also ask what could delay the job.
A contractor who says “nothing should go wrong” has either been incredibly lucky or has not done this very long.
What Is Included in the Price?
A low estimate may leave out more than you think.
Check whether the quote includes removal of old glass, hardware, delivery, installation, cleanup, sealing, and disposal. Ask whether wall repairs or extra visits cost more.
And get it in writing.
Nobody remembers a casual conversation the same way once an unexpected charge appears.
The quote should also explain what happens if the final measurements change the price. That can happen, but it should not arrive as a mystery after the glass has already been ordered.
What Warranty Do You Provide?
A warranty does not mean much until you know what it covers.
