Estimating glass labor comes down to four moves: takeoff the quantities, pick a crew, apply a production rate, and convert the hours to a burdened labor cost. The part that bites estimators is the production rate, because glazing productivity swings wildly with system type, panel size, height, and how the storefront or curtain wall is sequenced into the frame. Use ranges built from your own past jobs, not a single number pulled from a table.
What You Are Counting
Glazing labor is not one task. Break the takeoff into the actual work pieces before you pick any rate. For a typical storefront or curtain wall scope you are counting glass square footage, number of panels (EA), linear feet of mullions and perimeter framing, door leaves, and hardware sets. Each of these carries its own production rate, so lumping them all into one number is how jobs go sideways.
- Glass infill, measured in SF, split by monolithic, insulated, or laminated units.
- Aluminum framing and mullions, measured in LF, including horizontals and verticals.
- Door leaves and hardware sets, measured in EA, including closers, locks, and panic devices.
- Perimeter sealant and flashing, measured in LF, usually done by the same crew.
- Setting blocks, shims, and wedge anchors, counted in EA but usually bundled into the panel rate.
If the scope includes demolition of existing glass or frames, count that separately. Removing old storefront before installing new has its own production rate and its own crew, often a laborer pair with a glazier supervising.
Crew and Production Rate
A common glazing crew is two glaziers for field work, sometimes three on large curtain wall jobs where a third handles material handling and rigging. For simple in and out storefront swaps you can run a single glazier with a laborer. Pick the crew first, because the production rate is expressed in man hours per unit for that crew size, not per individual.
Production for glass is typically tracked as man hours per SF for infill, man hours per LF for mullions and perimeter, and man hours per EA for doors. Expect a wide band. A straightforward 4 by 8 lite in a stick system on the ground floor installs fast. A 5 by 10 insulated unit on the fifth floor of an occupied building, set from a swingstage, takes several times longer per SF. RSMeans and similar references publish ranges for storefront, curtain wall, and window wall systems, but treat any published number as a starting point and adjust it to your crew and conditions.
Apply productivity factors on top of the base rate. Height and access are the biggest movers: anything above two stories usually needs scaffolding or a boom lift, which cuts the effective rate. Congested interiors, occupied tenant spaces, and night work all slow the crew. Cold weather affects sealant cure and handling. A learning curve applies if the crew is new to the system.
Step by Step Labor Estimate
Run the math in a consistent order so you can check it against past bids. The order below works for almost any glazing scope.
- Takeoff: list each system separately. Storefront at grade, curtain wall above, separate doors and hardware.
- Crew: pick the crew size and composition for each system. Two glaziers is the default for field install.
- Rate: assign a man hour per unit rate for glass infill, mullions, doors, and sealant. Use a low and high number.
- Hours: multiply quantity by rate to get labor hours for each line. Add them for total hours.
- Burden: add labor burden, typically 30 to 45 percent on top of the bare wage, covering taxes, workers comp, insurance, and benefits.
- Cost: multiply burdened hours by the wage rate. That is your direct labor cost.
- Add mobilization, layout, cleanup, and punch list hours. These are real hours, usually 5 to 10 percent of install hours.
For a representative storefront scope of 600 SF of glass, 24 panels, and 240 LF of mullions, a typical crew might land around 48 labor hours for install plus layout and cleanup. At a burdened wage in the $40 to $65 range, that lands near $1,920 to $3,100 in direct labor cost. The glass labor rate before burden often runs $25 to $50 per hour depending on region, license level, and union versus open shop. Always confirm against your actual burdened labor cost, not a published average.
Factors That Move the Number
System type is the single biggest factor. Stick built curtain wall is slower than captured storefront because each mullion is field assembled and glazed. Unitized curtain wall is faster per SF on site but requires a crane and rigging crew, which is a separate labor line. Window wall in a midrise sits between the two.
Panel size and weight change everything. Once a lite exceeds about 60 SF or gets into insulated units, you need two glaziers plus a suction rig, and you lose the ability to use a single ladder set. Sealant work inside occupied spaces slows down because of protection, ventilation, and access rules. Perimeter conditions matter too: a flush punch opening installs faster than a recessed pocket with returns.
Do not forget the door and hardware side. Storefront doors with commercial hardware, closers, and panic devices are often a full day per leaf for hanging, hardware, and adjustment. Estimators who fold doors into the glass SF rate routinely underbid door heavy scopes.
Common Mistakes
- Using one blended production number for glass, mullions, and doors. Doors and hardware deserve their own line.
- Forgetting mobilization, layout, cleanup, and punch list hours. These alone can be 10 percent of install.
- Not burdening the labor rate. Bare wage is not your cost. Add taxes, insurance, benefits, and overhead.
- Ignoring access. Height, scaffolding, swingstages, and crane time all cut the effective production rate.
- Underestimating sealant and flashing. Perimeter sealant is its own LF line with its own rate.
- Skipping the learning curve on a new system. A crew new to unitized curtain wall will run slower than their stick system rate.
Putting It Together
Build a one page worksheet for each glazing scope. List the systems, the quantities, the crew, the low and high production rate, the resulting low and high labor hours, and the burdened labor cost. Compare the total to two or three past jobs of similar type. If the new number is more than 15 percent off a comparable job, find out why before you bid. Production rates are not opinions, they are records. Use your own records first, published ranges second, and a single point estimate never.