Questions to Ask a Glass Installer Before You Sign Anything

Not every glass company operates the same way, and the difference shows up fast once a project is underway. Before you sign anything or hand over a deposit, ask these questions. The answers will tell you exactly who you’re dealing with.

Why the Right Questions Matter

Custom glass work, especially a frameless shower enclosure, is not a commodity purchase. The glass is fabricated to your exact opening. If the measurements are off, or the installer cuts corners on the process, there’s no easy fix. You’re either living with a poor result or paying to start over.

Homeowners across Wake County and the broader Triangle region are spending real money on high-end renovations. A custom frameless shower, a floor-to-ceiling mirror, a commercial storefront, these are precision projects. The installer you choose either has the process to handle them correctly or they don’t. These questions help you find out before it matters.

Questions About Experience and Credentials

Start here. An installer’s background sets the baseline for everything else.

How long have you been doing this, and what types of projects do you specialize in?

There’s a difference between a company that installs frameless shower enclosures every week and one that does it occasionally between other jobs. Ask specifically about the type of work you need. A specialist in custom residential glass thinks differently than a general glazier who handles whatever comes in.

Experience also compounds. Someone with 30-plus years has seen what goes wrong on unusual installs, in out-of-plumb bathrooms, on large custom mirrors, on commercial storefronts with tricky framing. That pattern recognition is not something you learn from a manual.

Are you licensed and insured?

In North Carolina, you want a glass company that is licensed and insured. That’s the correct language. If someone says they’re “bonded” as part of their pitch, note that NC does not require a surety bond for glass work, so that claim doesn’t add what they’re implying. Licensed and insured is what matters, and any reputable company should confirm it without hesitation.

Do you do this work yourself, or do you sub it out?

Some companies sell the job and hand it off. Others handle the full process from measure to install. Knowing who actually shows up to your home matters, especially for high-end custom work where accountability is part of the service.

Questions About the Measurement Process

This is where custom glass projects succeed or fail. The measurement process is not a formality. It’s the foundation of the entire job.

How do you handle the critical measure?

A good glass installer will come to your home, take precise measurements of the actual opening, and account for walls that aren’t perfectly plumb and floors or curbs that aren’t perfectly level. This is called a critical measure, and it’s the step that determines whether your custom glass fits correctly.

What you don’t want: an installer who tells you to send them your measurements and they’ll order from there. For a mirror on a flat wall, approximate dimensions can get you a rough estimate. For a frameless shower enclosure with angles, wall variance, and hardware placement, the installer needs to take those measurements themselves on-site.

When do you order the glass?

The correct answer is: after the critical measure. Glass is fabricated to the dimensions captured during that site visit. Any company ordering glass before measuring your actual opening is taking a shortcut that often shows up as a gap, a wrong fit, or a panel that won’t close cleanly.

Questions About the Glass Itself

You don’t need to become a glass expert to ask smart questions. A few targeted questions will reveal whether the person you’re hiring actually knows their material.

Will the glass be tempered?

For shower enclosures, the answer should be yes, always. Tempered safety glass is typically required by code in showers and other hazardous locations. It’s engineered to break into small, relatively blunt pieces rather than large sharp shards. Any installer who’s unclear on this, or who suggests tempered glass is optional in a shower, is not someone you want on this job.

For mirrors and windows, the answer depends on the location and application. A qualified installer can explain exactly what’s required for your specific project.

What thickness are you recommending, and why?

For frameless shower glass, the standard options are 3/8 inch and 1/2 inch tempered. Thicker glass feels more substantial, holds truer over wider spans, and tends to look more premium. The right choice depends on the size of your enclosure and the hardware being used. An installer who gives you a clear explanation of the tradeoffs is showing you their knowledge base. One who defaults to the thinnest option without explanation may be optimizing for margin, not quality.

Are there protective coating options available?

Factory-applied hydrophobic coatings reduce water spotting and make the glass significantly easier to keep clean. Not every customer wants them, but every customer should know they exist. If the installer doesn’t bring it up, ask.

Questions About Timeline and Process

Custom glass takes time. The fabrication process, material lead times, and installation scheduling all factor in. A transparent installer will give you honest expectations upfront.

What’s the typical timeline from measure to install?

For most custom glass projects, including frameless shower enclosures in the Raleigh and Durham area, you’re looking at roughly one to fifteen days from the critical measure to installation, depending on the complexity of the project and current material availability. Any company promising an instant turnaround on fully custom work should explain exactly how that’s possible.

What does your process look like from start to finish?

A well-run glass company has a defined process. A good answer sounds something like this: we prequalify the project and give you a rough estimate, then schedule a critical measure appointment, collect a deposit, order the glass, receive and inspect the materials when they arrive, then call you to schedule the installation. That sequence protects you. The QC step before installation, specifically inspecting the fabricated glass before it comes to your home, is worth asking about directly.

How precise is your scheduling for the measure appointment?

This is a small question that reveals a lot. Companies that respect your time show up in a tight window. A one-hour appointment window is the right standard. An open-ended “sometime in the afternoon” approach signals disorganization, and that disorganization tends to show up in other parts of the project too.

Questions About Pricing and What You’re Actually Getting

You deserve to know what you’re paying for. A reputable glass company should be transparent about what’s included in a quote.

Can you give me a rough estimate before I commit to a site visit?

An experienced installer can often give you a useful ballpark over the phone or online based on approximate dimensions and the type of project. This is a genuine service. It lets you determine whether a project is in the right range before either party invests time in a site visit. If a company refuses to give any estimate without a paid consultation, ask why.

What’s included in the quote?

Labor, hardware, seals, sweeps, any protective coatings, and the installation itself should all be clearly accounted for. Know what’s included and what would be an add-on. The final price is confirmed after the critical measure, since that’s when the exact specifications are locked in, but the components of the quote should be clear from the start.

What happens if something changes after I approve the quote?

Scope changes happen. If you decide mid-process to change a hardware finish or add a panel, how does the company handle that? A clear, honest answer here is a good sign. Vagueness or frustration at the question is not.

Questions About Warranty and Aftercare

Quality work should stand behind itself. Ask specifically what’s covered and for how long.

What warranty do you offer on the work?

A reputable custom glass company should offer coverage on both the product and the labor. Ask for the details in writing. Know what’s covered, what isn’t, and how to make a claim if something comes up after installation.

What do I do if there’s a problem after you’re done?

This question is about accountability. Does the company have a real answer, or does the conversation get uncomfortable? A company that stands behind its work will tell you directly who to call and what the process looks like. One that’s evasive here is telling you something important about how they handle problems.

One Final Question Worth Asking

After you’ve covered the practical questions, there’s one more worth putting out there: What should I know about this project that I haven’t thought to ask?

A seasoned installer, the kind with decades of real project experience in homes across Durham, Wake County, and the surrounding Triangle counties, will have something useful to say. They’ll flag a detail about your specific bathroom layout, mention a hardware consideration you hadn’t considered, or point out something about the existing tile work that could affect the install. If they don’t have anything to add, that’s worth noting too.