Glazing bids are not straightforward to compare. This guide is written for GCs who want to evaluate glazing bids the right way, understand what's included and what isn't, and make award decisions that don't generate change orders at the worst possible time.
What a Complete Div 08 Bid Includes
Division 08 covers openings — doors, frames, hardware, glazing, and specialty systems. A complete glazing bid should clearly address every one of the following items. If any are missing or vague, you need clarification before you can use the bid in a fair comparison.
System Identification and Product Specs
A complete bid names the specific systems being proposed. Not "aluminum storefront" — but which manufacturer's product line, which series, which finish, and what performance ratings. The difference between a standard commercial storefront and a heavy commercial system from the same manufacturer can be a significant cost difference and a major performance difference, particularly in Florida where wind and impact requirements are real.
If a bid says "as-specified" or "per plans" without naming a manufacturer and product, that bid is incomplete. You have no idea what you're buying, and you have no basis for comparison. A glazing sub who can't name what they're bidding hasn't actually priced your job — they've written a placeholder.
Glass Specifications
Glass is often the largest single cost in a glazing scope. A complete bid specifies the glass makeup: thickness, type (tempered, laminated, insulated, impact-rated), coating (Low-E, tinted, reflective), and applicable performance ratings (design pressure, U-value, SHGC). Omitting glass specs from a bid is like leaving the lumber species out of a framing bid. It changes everything about the price.
Scope Inclusions and Exclusions
A complete bid clearly lists what's in and what's out. Inclusions should cover: supply and installation of glazing systems, hardware, perimeter sealants by the glazing sub, and any required blocking or backing that is the sub's responsibility. Exclusions should be specific — not just "exclusions per plans and specs" as a catch-all.
Common legitimate exclusions: rough opening preparation by framing contractor, structural steel by structural sub, electrical for automatic door operators, final cleaning beyond standard glazing cleanup. These are normal exclusions. What's not acceptable: blanket exclusions that eliminate entire systems or conditions without specificity.
Hardware Schedule
Door hardware is frequently a significant cost item and is sometimes excluded from glazing bids even when the glazing sub is installing the doors. Clarify who is supplying and installing door hardware — closers, panic hardware, locksets, hinges, threshold, and weatherstripping. An apples-to-apples comparison requires the same hardware scope across all bidders.
Schedule and Lead Times
A complete bid should reference the project schedule and confirm the sub's ability to meet key milestones. It should also flag any long-lead items that could affect the schedule and note current fabrication lead times. A bidder who doesn't address schedule has not fully thought through the work.
Red Flags in a Glazing Bid
Not every problem in a bid is immediately obvious. Here are the patterns that signal risk:
Vague Exclusions
"All work not specifically listed herein is excluded." This language turns a lump-sum bid into a time-and-materials contract the moment anything comes up in the field. Vague exclusions are a preview of the change order conversation you'll have after award. A reputable glazing sub knows what they're bidding and can be specific about what they're not.
No Product Specifications Named
As noted above — a bid without named products is not a real bid. It's an estimate based on assumptions that the sub made, not the ones you need. Before award, you should know the manufacturer, product line, series, finish, and performance ratings of every system in the bid. If you can't get that information from a bidder, that's a serious warning sign.
No Schedule Acknowledgment
A glazing sub who doesn't reference your schedule hasn't committed to it. "We'll coordinate with the GC" is not a schedule commitment. A responsive bidder notes the key milestone dates, confirms that current lead times allow them to meet those dates, and flags any risks to the schedule upfront.
Unusually Low Price Without Explanation
When one bid is significantly lower than the others, it's almost never because that sub is more efficient. It's because they've excluded something, assumed a lower-grade product, or missed something in the scope. Before you award on price, identify specifically why the low bid is lower. If the bidder can't explain the gap, the gap will reappear as a change order.
No Warranty Information
Commercial glazing carries manufacturer warranties on glass and coatings, and the installing contractor should provide a labor warranty on their installation. A bid that doesn't address warranty is a bid from a sub who hasn't thought about what happens after the job is done.
How to Compare Bids Fairly
A fair bid comparison requires equal scope across all bidders. Before you put numbers in a spreadsheet, do a scope leveling exercise:
Step 1: List every system in the project. Storefronts, curtainwall, windows, doors, interior glass, specialty items — every line item in the glazing scope.
Step 2: Confirm each bidder has priced every system. If bidder A's price covers the storefront and curtainwall but bidder B excluded the curtainwall, they are not comparable numbers.
Step 3: Confirm product specifications are equivalent. If bidder A proposed a standard commercial storefront system and bidder B proposed a heavy commercial system that meets the specification, they are not the same product. Get the product specs from each bidder and verify equivalence against the architect's specification.
Step 4: Add back scope differences. If a bidder excluded something that you know will be a cost — like hardware that the other bidder included — add a reasonable allowance for that item before comparing totals.
Step 5: Factor in schedule risk. If one bidder has acknowledged your schedule and one has not, that difference has a dollar value. A delayed glazing scope has downstream costs in superintendent time, other trades waiting, and potential liquidated damages exposure.
Insurance and Bonding Requirements
Verify the glazing sub carries appropriate insurance before award. Standard requirements for commercial glazing typically include general liability coverage, workers' compensation, and automobile liability. Larger projects and certain owner requirements may also require builder's risk, professional liability (for design-assist scopes), or an umbrella policy above the primary coverage limits.
If your project requires a payment and performance bond, confirm the glazing sub is bondable — meaning a surety company is willing to write the bond — before you include them in a bid comparison. Not all glazing contractors are bondable, and discovering this after award wastes everyone's time.
License verification is straightforward in Florida: the state's DBPR database lets you look up any contractor's license status. For commercial glazing in Florida, look for a CGC (Certified General Contractor) or CG (Certified Glazing Contractor) license with no disciplinary history. ACG's license number is CGC1531993.
Verifying Track Record
Ask for references from GCs who have worked with the sub on comparable project types and scopes. A glazing sub with a strong residential track record is not necessarily the right choice for a ten-story curtainwall. Ask specifically: How did they manage the submittal process? Did they hit the schedule? How did they handle problems? Would you use them again?
Look at completed projects, not just portfolio photography. A glazing sub's portfolio shows what they've installed. References tell you what it was like to build alongside them. Both matter.
ACG has completed 350+ projects across Florida with over 1 million square feet of glass installed. We work with GCs across the state from our offices in West Palm Beach, Naples, and Tampa. Our portfolio shows the range of project types we handle, and we provide GC references on request. You can also visit our GC resource center for additional tools and resources built specifically for general contractors evaluating glazing scopes.
Why Lowest Bid Isn't Always Best
The economics of commercial glazing make this clearer than in most other trades. Glass is expensive. If something goes wrong — wrong glass is fabricated, a unit is broken during installation, a frame is measured incorrectly — the replacement cost is not trivial. A glazing sub with thin margins and minimal overhead doesn't have the cash flow or the bench depth to solve problems quickly.
The cost of a glazing scope that goes sideways — in superintendent time, change order management, schedule recovery, and potential claims — almost always exceeds the savings from accepting the low bid. The most expensive glazing scope is the one that delays your certificate of occupancy.
The right question isn't "who's lowest-priced?" It's "who can execute this scope on time and on spec, with the resources to handle whatever comes up?" That's the evaluation that produces the best outcome on the job.
ACG returns complete, itemized bids with named products, clear inclusions, specific exclusions, and schedule acknowledgment. We can usually price a commercial glazing scope within 48 hours of receiving drawings. Use the Scope Engine to start the process, review our full services, and contact us directly with any questions.
Frequently Asked Questions
What does Div 08 cover?
Division 08 in the MasterFormat specification system covers openings, which includes doors and frames, windows, storefronts and curtainwall systems, hardware, and specialty glazing systems like fire-rated glass and blast-resistant glazing. Glazing contractors typically bid and install all of these systems, though hardware supply is sometimes split between the glazing sub and a hardware supplier depending on project complexity.
How many glazing bids should I get?
For most commercial glazing scopes, three bids is the standard minimum to get a competitive range and have a meaningful basis for comparison. For very large or complex scopes, more bids can be valuable. For smaller or simpler scopes where the spec is tight and the market is thin, two strong bids from qualified subs may be sufficient.
Can I ask a glazing sub to rebid after I've received all bids?
Asking subs to revise their bids after you've received all pricing — sometimes called "bid shopping" — damages the trust that keeps good subs returning your calls on the next job. It also creates legal and ethical issues in some procurement contexts. The better approach is to ask clarifying questions and scope questions before bids are due, so you're receiving apples-to-apples bids in the first place.