Glazing Cost Per Square Foot
(2026): Storefront vs Curtain Wall
Glazing cost per square foot depends almost entirely on system type. Storefront runs $25-$60/SF, low-rise curtain wall $25-$75/SF, and tall multi-story unitized curtain wall can reach $200-$400/SF once structural and performance requirements pile on.
Cost per square foot by system
The single biggest variable in a glazing estimate is which system the architect specified. Storefront and curtain wall are genuinely different structural and cost categories, and conflating them is one of the most common sources of scope gap in commercial glazing bids.
Storefront systems — grade-level entries, lobbies, low-rise retail — run roughly $25–$60/SF installed. Individual windows within a storefront package can reach $50–$150 installed when you factor in hardware, flashing, and sealant. Curtain wall changes the calculus significantly. Low-rise stick-built curtain wall (typically under four stories, no crane required) runs $25–$75/SF. Tall multi-story unitized curtain wall is a different universe: $200–$400/SF once you account for unitized panel fabrication, engineering, crane time, and structural backup framing.
Separate storefront from curtain wall in your takeoff from the first pass. They carry different labor rates, different engineering requirements, and different subcontractor pools. Blending them into a single line item produces a number that is wrong in one direction or the other.
| System | Installed cost range | Typical context |
|---|---|---|
| Storefront | $25–$60/SF | Grade entry, low-rise retail, interior partitions |
| Curtain wall, low-rise | $25–$75/SF | 2–4 story, stick-built, no crane |
| Curtain wall, multi-story | $200–$400/SF | High-rise, unitized panels, crane-dependent |
| Individual windows (storefront pkg) | $50–$150 installed | Per opening, includes hardware and sealant |
Crew productivity
Productivity assumptions drive your per-SF labor cost as much as any wage rate. A two-person storefront crew installs 150–250 SF per day under normal conditions — clean deck, frames pre-delivered to the opening. At that rate, a 2,000 SF package takes roughly 2–3 weeks including punch list, accounting for glass delivery sequencing, sealant cure time, and hardware installation. Estimators who use raw installation days and forget punch list time consistently under-schedule glazing.
Curtain wall productivity is lower and crane-dependent. Unitized panels arrive pre-glazed from the fabricator and stack-mount onto structural anchors — installation can be fast once the crane is in position, but crane scheduling, floor cycle coordination, and wind hold days compress daily output significantly. On tall buildings, access logistics often dominate the schedule more than the panel-hanging rate. Build labor buffer explicitly rather than assuming best-day rates across the full duration.
Glass vs. system cost
The glass itself typically represents 40–60% of total material cost on a glazing package. The remainder is aluminum framing, mullions, gaskets, thermal breaks, setting blocks, and anchors. IGU performance requirements are the main lever: a code-minimum double-pane clear unit is inexpensive, but adding a low-E coating, argon fill, and a U-0.24 or tighter target for ASHRAE 90.1 compliance raises glass cost measurably. Triple glazing can run two to three times the cost of a standard double pane.
Specialty glass types add further cost above vision glass benchmarks:
- Spandrel glass (ceramic frit or painted back) is a moderate premium and requires coordination with the spandrel cavity insulation detail.
- Fire-rated glazing — required at corridor windows, stairwell enclosures, and atrium smoke barriers — can run three to five times the cost of equivalent vision glass, and the framing must be fire-rated to match.
- Structural glass (point-fixed or frameless) carries a fabrication premium and requires engineer-stamped connection details that affect the backup structure cost too.
Mark which openings call for vision, spandrel, fire-rated, or structural glass before you price anything. Grouping all glazing under a single unit cost is a reliable way to underbid specialty items.
What to check before the takeoff
Four items determine whether your number holds through VE and buyout. Missing any of them is the kind of scope gap that surfaces at the worst possible moment.
System type per the glazing schedule and details. Confirm which openings are storefront, which are curtain wall, and which (if any) are window wall — a distinct system that sits between floors rather than spanning them. If drawings use system type language inconsistently, flag it during RFI before pricing.
Performance specifications: U-factor, SHGC, air and water infiltration. These drive glass cost and can affect the aluminum system selection. A project targeting LEED EA1 or a tight envelope compliance path will have more demanding specs than a code-minimum build. Pull the performance table and verify the unit you are pricing actually meets it — substitutions that fail the mock-up are expensive.
Vision vs. spandrel areas by elevation. Take them off separately. Spandrel area is typically measured as the glass-to-glass dimension including the cavity zone, and responsibility for the cavity insulation varies by project delivery method. Know which before you bid.
Anchorage and structural backup conditions. On renovation projects especially, the backup condition is often different from what the drawings assume. On curtain wall, confirm whether embed plates are the glazing sub's scope or the concrete contractor's.
- System type per glazing schedule and details
- Performance specs: U-factor, SHGC, air and water infiltration
- Vision vs. spandrel areas by elevation
- Anchorage and structural backup conditions
Questions estimators actually ask
What is the cost per square foot for storefront versus curtain wall?
Storefront runs about $25-$60/SF. Curtain wall runs $25-$75/SF for low-rise systems and $200-$400/SF for tall multi-story systems.
How much storefront can a crew install per day?
A two-person crew installs 150-250 SF of storefront per day. A typical 2,000 SF package takes 2-3 weeks including punch list.
What share of glazing cost is the glass itself?
Glass is typically 40-60% of the total material cost on a glazing package, with aluminum framing, gaskets, and anchors making up the rest.
How do I tell curtain wall from storefront in a takeoff?
Storefront is a lower, non-structural system usually at grade; curtain wall is a continuous, often multi-story enclosure. The glazing schedule and details define each; take them off as separate scopes.
What raises glazing cost per square foot?
Building height (crane and unitized systems), IGU performance like low-E and argon for tighter U-factors, and specialty glass such as spandrel, fire-rated, or structural glass.