August 8, 2026
What to Ask a Glazing Sub Before You Put Them on Your Schedule
Finding a glazing contractor you can count on is harder than it should be.
Not because there aren’t good ones. Because the thing that makes a sub good — whether they’ll answer the phone in week six when something moves — is almost impossible to see in week one. The bid looks fine. The license checks out. And then you’re standing in a finished bathroom with no glass, explaining it to your client.
Here are the seven questions that surface the difference before it costs you anything.
1. Who's actually going to be on my job?
There’s a real gap between the person who bids your job and the person who shows up to install it. Ask who runs the crew, whether the owner sees the project, and whether the same people who measured will be the ones installing.
The answer tells you how much translation has to happen between the estimate and the install — and every translation is a chance for something to get lost.
2. What's your lead time, and what makes it longer?
Any sub can give you a number. The useful follow-up is what stretches it.
Custom sizes, non-stock hardware finishes, specialty glass, and oversized units all carry different lead times than standard material. A sub who can tell you which of those apply to your job is a sub who has actually thought about your job. A sub who says “two weeks, no problem” without asking what you’re specifying is guessing.
3. What do you need from me before you measure?
This is the single most valuable question on the list.
Glass gets field-measured off finished surfaces — tiled walls, finished curbs, cured waterproofing. A sub who measures too early hands you a piece of glass that doesn’t fit. A sub who waits too long puts the material order on your critical path.
Ask what has to be done before they measure, and ask for it in writing. If they can’t answer specifically, they haven’t done this on enough jobs to protect your schedule.
4. Where does blocking need to go, and when do you need to tell my framer?
Railings, heavy doors, and header supports all need something solid behind the finish surface. That decision gets made during framing and becomes very expensive to fix after drywall and tile.
A glazing sub who raises blocking on their own, before you ask, is thinking about your sequence instead of just their scope.
5. How will I hear from you — and how often?
Ask specifically. Not “do you communicate,” because everyone says yes.
Do they confirm dates in writing? Do they call before they head out? If material slips, who tells you and how fast? The goal is simple: you should never find out about a problem on your job from your own client.
6. Can you send a COI, W-9, and current workers' comp certificate?
Standard paperwork, but the speed of the response is the real signal. A sub who turns it around the same day is organized. A sub who takes a week to find their insurance certificate will take a week to find your delivery date, too.
If you’re on a public job, also ask whether they handle certified payroll and prevailing wage before you get to the bid.
7. What does the estimate include, and what would trigger a change order?
An itemized estimate protects your bid. A lump sum protects theirs.
Ask what’s excluded, what assumptions the number is built on, and what would change it. Then ask whether change orders come in writing before material gets ordered. The answer to that last one is worth more than a few percent on the bid.
The pattern underneath all seven
Every one of these questions is really asking the same thing: will this sub tell me things before I have to ask?
The subs who cost you clients aren’t usually bad at glass. They’re bad at information. They know about the delay for four days before you do, and by the time it reaches you, your only remaining option is the expensive one.
How we answer these
At Aim Fuller Glass, our owner is personally involved on every project. Our technicians are uniformed and trained to communicate at every stage — we coordinate with you days in advance and call before we head out, so you’re never chasing us for updates.
We’re a licensed C-17 glazing contractor with 15+ years serving Ventura County, and our site requirements, lead times, and paperwork are all published on our General Contractors page so you don’t have to ask.
Your reputation shouldn’t be at the mercy of a sub who won’t pick up the phone.
Getting started is simple:
Email Aim Fuller Glass your project details.
Get a personal consultation and free visual mockup.
Get glass handled by the pros — on time.