Choosing a facade system begins not with a product but with a performance brief: quantify your thermal, solar, acoustic, structural, water-tightness and buildability targets first, and the right system almost selects itself. The four realistic options on most Indian projects are stick-built and unitised curtain wall, window wall, two- and four-side structural glazing, and ACP or composite rainscreen - and each wins on a different combination of programme, budget, height and geometry. This guide gives architects, builders and property owners in Hyderabad, Secunderabad and across Telangana and Andhra Pradesh a defensible framework for that decision, plus realistic INR rates to sanity-check any tender.
When you specify a facade you commit the building to a load path, a drainage strategy and a maintenance regime for its entire life, so the choice deserves the same rigour you give the primary structure. Each system also fails in a predictable way when its interfaces - slab edge, waterproofing, fire-stop, silicone joint - are ignored. The aim here is to give you specification language you can defend at tender and the interface awareness that keeps a facade watertight through a Hyderabad monsoon and stable under its wind and thermal loads.
Whether you are detailing a corporate tower in the Financial District, a hospital in Secunderabad or a retail podium along the Outer Ring Road, the same criteria govern. Below we walk through the performance brief, the system trade-offs, glazing strategy for the local climate, structural and buildability checks, honest INR budgeting, and how our glass facade work team supports design-assist and buildability review from the earliest concept stage.
What is a facade system, and why the choice matters
A facade system is the engineered external envelope that separates a building's interior from the weather while carrying its own wind and dead loads back to the structure. It is far more than a skin of glass and aluminium: it is a coordinated assembly of framing, glazing or cladding, gaskets, sealants, thermal breaks, anchors and a deliberate drainage path, all designed to work as one system for decades.
The system you choose sets the building's energy bill, its acoustic comfort, its rain performance and a large slice of its capital cost. A poorly matched facade quietly overloads the air conditioning for the life of the building, leaks at the first heavy monsoon, or looks premium on day one and drops a door within a year. Getting the selection right at concept stage - before the glass schedule and mullion sizes are locked - is the single highest-leverage decision on the envelope.
Start with the performance brief, not the product
Before comparing any facade system, lock down measurable criteria on your drawings and tender. Everything downstream - glass make-up, mullion depth, anchor design, sealant selection - flows from these numbers, and a vague brief is the single biggest cause of value-engineered failures.
- Thermal: assembly U-value (W/m2K) and glass SHGC, tested against ECBC prescriptive limits or a whole-building energy simulation.
- Daylight and glare: VLT (visible light transmittance) balanced against SHGC via the light-to-solar-gain ratio, targeting a ratio above 1.25 for efficient glazing.
- Structural: design wind pressure derived from IS 875 (Part 3) using the site basic wind speed (44 m/s for the Hyderabad zone), terrain category and building height.
- Acoustic: weighted sound reduction index Rw with C and Ctr spectrum adaptation terms for road, rail or airport-facing elevations.
- Water and air: static and dynamic water-penetration and air-infiltration classes, verified by ASTM E283, E331 and E547 or CWCT-style mock-up testing.
- Movement and deflection: thermal movement range plus stated deflection limits before you size any member.
Write these as pass/fail targets with a margin, not aspirations. A facade that meets SHGC 0.28 on the calculation but 0.34 as built will quietly blow the cooling load for the life of the building. If you are a builder or owner rather than a specifier, this is exactly the stage where early design-assist pays for itself - get a free quote and we can help translate a brief into a buildable specification.
The facade system options and where each one wins
Every facade family solves a different problem. Match the system to the building's height, programme and geometry rather than to a favourite detail.
- Stick-built curtain wall: assembled mullion-by-mullion on site. Best for low-to-mid rise, irregular geometry and tighter budgets; it is slower, scaffold-dependent and more reliant on site workmanship for water-tightness. Our curtain wall glazing crews build both stick and unitised systems.
- Unitised curtain wall: factory-glazed panels craned into place on interlocking stack joints. Best for high-rise, repetitive grids and fast programmes; it offers superior factory QA and speed at higher tooling cost, and it demands disciplined slab-edge tolerances.
- Window wall: floor-to-floor units bearing on the slab, common in residential towers. Economical and simple to install, but the slab edges are exposed and acoustic and thermal continuity at the floor line needs deliberate detailing.
- Structural glazing (2-side / 4-side SSG): flush glass bonded with structural silicone for a frameless read. High aesthetic value, but it demands rigorous silicone design, controlled factory bonding and a drained, back-ventilated cavity.
- Spider / point-fixed glazing: toughened panes held on bolted stainless spider fittings, ideal for entrance canopies, atria and double-height lobbies where maximum transparency is the brief.
- ACP, composite or terracotta rainscreen: drained, back-ventilated cladding over insulation. Excellent for solar-shaded solid facades and mixed-material elevations; specify the fire performance of the core deliberately after the Grenfell-era tightening of NBC provisions - fire-retardant (FR) or A2 non-combustible cores, never ordinary polyethylene.
Curtain wall vs window wall vs structural glazing compared
The three most-confused systems trade off differently on cost, water-tightness and appearance. Use this quick comparison before you commit a system to the tender package.
- Water-tightness: curtain wall (continuous, slab-bypassing skin) is strongest; window wall exposes the slab edge; structural glazing depends entirely on the cavity and silicone joint design.
- Cost per sq ft: window wall is typically the cheapest, stick curtain wall mid-range, unitised and four-side SSG the most expensive.
- Speed: unitised is fastest on repetitive towers; stick and window wall are slower and scaffold-dependent.
- Appearance: structural glazing gives the flushest, most frameless read; curtain wall shows capped or SG grid lines; window wall reveals floor-line breaks.
- Buildability risk: window wall and unitised are most sensitive to slab-edge tolerance; stick-built is most sensitive to on-site sealant workmanship.
In practice many Hyderabad projects mix systems - unitised on the tower, spider glazing at the lobby, and ACP rainscreen on the service cores - so evaluate each elevation on its own brief rather than forcing one system across the whole envelope. You can see how these systems combine on real elevations in our recent projects.
Glass and thermal strategy for Hyderabad's climate
Hyderabad's composite climate - hot dry summers, a strong south-west monsoon and mild winters - rewards controlling solar gain without killing daylight. On highly glazed facades, aim for an SHGC of roughly 0.25-0.30 while holding VLT high enough (often 0.40 or more) to reduce artificial lighting during the day.
- Use high-performance solar-control double glazing (DGU), or single-glazed low-E where the acoustic and thermal brief allows and budget is tight.
- Specify heat-strengthened or toughened glass per IS 2553 for thermal-stress and safety-critical locations, and require heat-soak testing on toughened glass to limit spontaneous nickel-sulphide failure.
- Pair glazing with external shading - fins, projections and deep reveals - because passive shading is cheaper per unit of SHGC reduction than premium coatings.
- Orient the strategy by elevation: west and south-west facades take the worst solar and monsoon-driven rain in Hyderabad and justify tighter SHGC and deeper shading than north elevations.
- Document the compliance route (ECBC prescriptive vs whole-building) and any green-rating target (IGBC, GRIHA or LEED) so the facade's contribution is credited in the model.
- Coordinate the glazing with the framing thermal break; a high-spec glass unit inside a non-thermally-broken aluminium frame will still condense and conduct heat at the edge.
Structural, drainage and buildability checks
The glass is rarely what fails - the interfaces are. Resolve the load path, drainage and tolerances on paper before a single panel is fabricated.
- Deflection: cap mullion deflection at L/175 or 19 mm (whichever is smaller) for spans up to about 4.1 m, and L/240 + 6.4 mm for longer spans; state the governing limit on the drawing.
- Wind load: confirm zone-specific design pressures and the higher corner and parapet local pressure coefficients from IS 875 Part 3 before sizing any aluminium profile.
- Anchors and dead load: coordinate cast-in channels or post-fixed brackets with the structural engineer, and verify slab-edge tolerance against the system's adjustability (typically +/- 10-12 mm in three axes).
- Drainage: adopt a pressure-equalised, drained-and-back-ventilated principle with clear weep paths - never rely on face sealant as the sole water barrier.
- Fire and life safety: detail perimeter fire-stopping at every floor slab edge and comply with NBC 2016 provisions for the building's class and height.
- Hardware coordination: entrance doors within the facade need correctly rated floor springs, door closers and patch fittings sized to the leaf weight, or the whole elevation looks premium while the door drops within a year. Browse the full envelope scope across our services to see how glazing, doors and fittings are packaged together.
Facade cost per sq ft in Hyderabad: realistic INR rates
Cost per square foot swings widely with glass spec, height and system, but these indicative supply-and-install ranges for the Hyderabad and Secunderabad market help you sanity-check a tender. Treat them as 2026 order-of-magnitude figures, not quotations - the glass make-up alone can move a rate by several hundred rupees.
- ACP / composite rainscreen: roughly INR 220-450/sq ft depending on panel grade and fire-core rating.
- Stick-built curtain wall with DGU: roughly INR 850-1,500/sq ft depending on glass and framing depth.
- Unitised curtain wall: roughly INR 1,600-2,600/sq ft, justified on tall, repetitive, fast-track towers.
- Two- and four-side structural glazing: roughly INR 1,400-2,400/sq ft including structural silicone and mock-up testing.
- Spider / point-fixed glazing: roughly INR 1,800-3,000/sq ft including bolts, fittings and toughened low-iron glass.
Add 3-6% for a performance mock-up and lab testing on large projects - a cost that is trivially recovered the first time it catches a detail before it is repeated 400 times on site. Our curtain wall glazing estimates itemise glass, framing, sealant and testing separately so you can see exactly where the money goes.
Common facade mistakes to avoid
Most facade problems trace back to a handful of avoidable errors made at specification or coordination stage, not to bad glass.
- Value-engineering the glass coating without re-checking SHGC and ECBC compliance, so the building silently exceeds its cooling load.
- Treating the outer sealant as the water barrier instead of designing a drained, pressure-equalised cavity with real weep paths.
- Ignoring slab-edge tolerance until installation, then discovering the anchors cannot take up the deviation.
- Omitting a performance mock-up on a large repetitive facade and repeating a hidden detailing fault across every floor.
- Specifying ACP without confirming the fire-core rating, or toughened glass without heat-soak testing.
- Forgetting maintenance and glass-replacement access, leaving no safe way to swap a broken pane at height for the building's whole life.
A shortlist checklist and where Hakimi fits
Run every candidate system through the same filter before you commit it to the tender documents.
- Does it meet the U-value, SHGC, Rw and water/air classes with a real margin, not just on paper?
- Is the deflection and anchor design compatible with the primary structure and its tolerances?
- Are all interfaces - slab edge, waterproofing, roof, soffit, fire-stop - resolvable with standard details?
- Is a performance mock-up (visual plus lab or site water test) written into the specification?
- Is the maintenance and glass-replacement strategy achievable for the building's whole life, including access?
Hakimi Aluminium and Glass provides design-assist, shop drawings, fabrication and installation for architects, builders and owners across Hyderabad, Secunderabad, Telangana and Andhra Pradesh - useful when you want early buildability input on interfaces and system selection. As an authorised dealer for Taiton, Enox and Ozone, we also supply the fittings that finish a facade. When you are ready to size and price a specific elevation, get a free quote with your drawings and glass schedule and we will return an itemised, code-referenced estimate.
