Glazing Schedule Explained: The Complete 2026 Reference

What a glazing schedule is and why it governs the facade

A glazing schedule is a per-type register: one row completely defines one glass type, and every opening on the project points to a row by its type mark. It governs the facade because it is the only place where intent scattered across elevations, sections and the specification is reconciled into a single, priceable, checkable definition.

Think of it as the contract between drawings. The energy model assumes a U-value; the certifier checks an SHGC; the fabricator cuts to a make-up; the installer sets a pane into a frame with the right edge bite. All four are looking at the same row. If the schedule is vague, each party fills the gap with an assumption, and those assumptions rarely agree.

• It fixes make-up: outer pane, cavity, inner pane, coatings and interlayers, in sequence.
• It fixes performance: U-value, SHGC, VLT and acoustic Rw as required values, not indicative ones.
• It fixes compliance: safety-glazing flags, wind zone and deflection basis.
• It fixes location: which type mark goes where, so nothing is left to be resolved on site.

On facade projects the schedule is what the glass fabricator prices and certifies against, which is why loose scheduling is the most common single source of tender-stage variation and site-stage rework in Hyderabad's commercial market. You can see how the schedule translates into finished facades across our recent projects.

What the schedule must carry against every type mark

Treat each row as a complete definition of one glass type. At minimum, schedule the following against every type mark:

• Type mark and description (for example GL-01, DGU vision glass; GL-02, spandrel; GL-03, laminated balustrade).
• Full make-up in sequence: outer pane, cavity, inner pane (for example 6 mm HS low-E / 12 mm argon / 6 mm clear).
• Nominal overall thickness and individual pane thicknesses.
• Glass treatment: annealed, heat-strengthened (HS) or fully toughened (FT), plus any lamination interlayer (PVB or SGP) and thickness.
• Coating type and surface number (for example low-E on surface 2 or 3).
• Performance set: U-value (W/m2K), SHGC, VLT, light-to-solar-gain ratio, and acoustic Rw where relevant.
• Edge and cavity detail: spacer type (warm-edge preferred), gas fill and percentage, secondary seal.
• Location and schedule of use, plus any safety-glazing flag.

Add columns for wind zone or design pressure where pane sizes vary across the elevation, and a remarks column for fire-rated, bird-safe, fritted or ceramic-printed variants. Where the same glass will be door-mounted or set into an operable sash, note the associated hardware family and profile early so the schedule reads as a buildable assembly rather than a glass wish-list. A schedule that stops at the glass but ignores the framing and fittings that carry and move it is only half a schedule, and the missing half always surfaces on site.

Performance criteria to lock down for Hyderabad and Telangana

The numbers you schedule are the ones the facade will be tested and certified against, so specify them as required values, not indicative ones. For Hyderabad's composite-to-hot climate, and for the hotter, more humid stretches of coastal Andhra Pradesh, solar control usually governs before U-value.

• SHGC: lower values (often 0.25-0.35 on vision glass) cut cooling load; check against your ECBC compliance route and the whole-building energy model. A glass at SHGC 0.27 versus 0.40 can shave meaningful tonnage off the HVAC plant on a large office floor.
• U-value: matters most on conditioned, high-glazing facades; a low-E DGU typically lands around 1.6-1.8 W/m2K, well below a monolithic pane at roughly 5.7 W/m2K.
• VLT: balance daylight and glare; a high light-to-solar-gain ratio (VLT divided by SHGC, ideally above 1.25) is the mark of good selective glass.
• Acoustic Rw: schedule asymmetric laminates (for example an 8.8 laminated outer pane against a 6 mm inner) where road or rail noise is present, common along Hyderabad's ORR and inner-ring corridors.
• Wind load: derive design pressures from IS 875 Part 3 for the site basic wind speed and terrain, then size glass thickness and pane area accordingly.
• Deflection: hold glass and framing deflection to the specified limit, commonly span/175 or 20 mm, whichever is less.

Reference ECBC for envelope performance and IGBC, GRIHA or LEED credits where the project targets a rating, and make sure the scheduled values actually deliver those credits. If you are unsure whether a single make-up can hit both the energy and the acoustic target, get a free quote with your elevation and we will run the numbers before you commit the schedule to tender.

Glazing schedule cost: indicative INR ranges

The schedule is where the facade budget is actually committed, because each type mark carries a rate, and the rate is driven by the make-up you write down. The figures below are indicative supplied-and-installed ranges for the Hyderabad and Telangana market in 2026 and are meant for early sanity-checking, not for final pricing.

• Plain toughened single glazed pane: roughly Rs 250-450 per sq ft, suitable for internal partitions and non-conditioned openings.
• Laminated safety glass (for example 6.38 mm PVB): around Rs 350-600 per sq ft, depending on interlayer and pane treatment.
• Standard low-E double glazed unit (DGU): commonly Rs 850-1,600 per sq ft, driven by coating grade, cavity build and gas fill.
• Acoustic or high-performance DGU with asymmetric laminated panes: Rs 1,400-2,400 per sq ft where road, rail or airport noise is a driver.
• Structural or frameless glass with SGP interlayer: from around Rs 1,600 per sq ft upward, before spider, patch or clamp hardware.

Two costs are routinely missed at schedule stage. First, hardware: floor springs, patch fittings, sliding gear and door closers must be rated for the scheduled pane weight, and under-rated hardware fails within months. Second, lead time as a cost: imported low-E coated glass and specialist fittings can both carry four to eight week lead times in the Hyderabad market, so a late schedule revision can cost more in programme than in glass. Precision at schedule stage is directly a budget decision, which is why loose scheduling shows up later as variation orders.

Safety, thickness and structural sizing

Safety glazing is a code obligation, not a preference. IS 2553 governs safety glass and NBC 2016 sets out where impact-safe glazing is required, and a good schedule flags every such location explicitly rather than leaving it to the installer to interpret.

• Specify toughened or laminated safety glass at doors and adjacent side panels, glazing below roughly 800 mm sill height, wet areas such as shower enclosures, and any large pane at human-impact risk.
• Prefer laminated (PVB, or the stiffer SGP) where post-breakage retention matters: overhead glazing, balustrades, and facades over public thoroughfares.
• Use heat-soaked toughened glass to reduce the risk of nickel-sulphide spontaneous breakage on fully-tempered facades, and specify the heat-soak test in the schedule remarks.
• Size glass thickness from the governing wind pressure and pane geometry; larger and more exposed panes need thicker or heat-treated glass, so thickness can legitimately vary by elevation zone.
• For structural and frameless glass, laminated interlayer choice (SGP versus PVB) affects load sharing and residual capacity, and belongs on the schedule alongside the bolt or clamp specification.

Where you carry frameless or bolted assemblies, cross-reference the structural glass calculation so the scheduled make-up matches the analysis, and confirm the fittings you select are rated for the scheduled pane weight and edge condition. A 12 mm toughened balustrade panel weighs around 30 kg per square metre, so the clamp, patch and spider selection is a structural decision, not a finish one.

IGU make-up and edge detailing

The insulated glass unit is a system, and its cavity and edge decisions belong on the schedule because they change both performance and durability.

• Cavity width: 12-16 mm is the usual sweet spot for argon-filled DGUs; wider cavities give diminishing thermal returns and can start to convect internally.
• Gas fill: argon is standard for improved U-value; note the fill percentage on the schedule, as a partially filled cavity underperforms its scheduled value.
• Spacer: specify warm-edge spacers to reduce edge condensation risk and improve the whole-unit U-value, which matters in humid coastal Andhra Pradesh conditions.
• Coating surface: place low-E on the correct surface (commonly surface 2 in hot climates) and state it explicitly, because a wrong surface silently changes SHGC and can quietly break energy compliance.
• Secondary seal and edge cover: ensure sufficient edge bite and UV-stable seals, especially for structurally glazed units where the seal is doing structural work.

Note that the centre-of-glass value differs from the whole-unit value once the frame and edge are included, so state which basis your scheduled U-value uses. This one distinction is where many schedules quietly fail an as-built energy check, because the model was fed a centre-of-glass number the whole unit never delivers.

Common glazing schedule mistakes to avoid

Most schedule failures are not exotic; they are the same handful of omissions repeated across projects. Catching them before tender is far cheaper than catching them on site.

• Scheduling glass but not the coating surface, so SHGC is left to the fabricator and energy compliance drifts.
• Quoting a centre-of-glass U-value as if it were the whole-unit value, then failing the as-built check.
• Inventing near-duplicate type marks (GL-01a, GL-01b) that fragment procurement and confuse the fabricator.
• Ignoring the hardware rating, so a heavy DGU sash or frameless door is hung on under-rated gear and drops within months.
• Leaving safety-glazing flags implicit, forcing the installer to interpret code on site.
• Forgetting lead time, so a late make-up change collides with an eight-week import and stalls the programme.

The cure for all six is the same: treat each type mark as a complete, self-contained definition, and reconcile it against the section details, the performance spec and the energy model before it is issued. A schedule reviewed once against those three documents will out-perform a schedule revised five times on site.

Coordinating and keeping the schedule live to site

A glazing schedule does not live in isolation; it has to marry to the framing and the moving parts, and it only works if it stays synchronised with the rest of the package through every revision.

• Match scheduled glass thickness to the framing system: a 24-28 mm DGU needs a deeper glazing pocket than a 6 mm monolithic pane, which affects your aluminium windows and door profile selection.
• Key every opening on plans and elevations to a schedule type mark, and reuse marks rather than inventing near-duplicates.
• Reconcile the schedule with section details: cavity, spacer and coating surface must match what the head, jamb and sill details show.
• Coordinate the schedule with the performance specification so tolerances, testing (air, water and wind) and warranties align.
• Version-control the schedule and issue it with a clear revision, so fabrication works to one source of truth rather than a marked-up print.

Hakimi Aluminium and Glass provides design-assist, shop drawings, fabrication and installation across Hyderabad, Secunderabad, Telangana and Andhra Pradesh, and can validate scheduled make-ups against wind, thermal and acoustic targets before you issue for tender. Explore our services to see how the glazing schedule connects to the rest of the facade package, from structural glass to operable windows and the hardware that completes them.