uPVC Windows vs Aluminium Windows
Comparing Multi-Chambered uPVC vs Thermal-Break System Aluminium Windows
Technical Comparison Matrix (2026 Standards)
Field Tested| Parameter | Multi-Chambered uPVC Windows (Kommerling/Fenesta) | System Aluminium Windows (Schüco / Domals / Reynaers) |
|---|---|---|
| Price Benchmark | ₹450 – ₹950 / sq.ft (Double Glazed DGU) | ₹750 – ₹2,200 / sq.ft (Thermal Break Sections) |
| Porosity & Core Structure | Non-conductive polymer extrusion with galvanized steel reinforcement | High-strength structural aluminium alloy (6063-T6) with polyamide barrier |
| Expected Lifespan | 25–30 years; zero corrosion in coastal climates (Mumbai, Chennai) | 40–50+ years; highest structural strength for floor-to-ceiling glass |
| Installation Speed | Pre-fabricated off-site; fast 1-day anchor bolt install per apartment | Precision site assembly and structural glazing |
| Wastage Factor | Factory fabricated to exact millimeter rough opening measurements | Fabricated to exact structural engineer CAD schedules |
| Stain & Chemical Resistance | UV-stabilized; will not fade, warp, or conduct heat | Anodized or PVDF powder-coated; completely weather-proof |
| Aesthetic & Surface Look | Clean modern profiles available in white, anthracite grey, and wooden foil | Ultra-slim sightlines (minimal frame, maximum glass exposure) |
Cost Calculation & Difference Billing Framework
When offering buyer personalization, developers and architects must apply exact difference billing equations to ensure transparent customer invoicing and protect project margins:
Real-World Case Walkthrough
For a 20th-floor 3BHK flat on a busy Indian arterial road: Standard builder aluminium sliding window transmits 68 dB traffic noise. Upgrading to 3-track multi-chambered uPVC with 24mm DGU (₹850/sq.ft) reduces interior ambient noise down to 32 dB (whisper-quiet), commanding a ₹1.5L–₹2.5L buyer upgrade premium.
Live Difference Billing SimulatorInteractive
Adjust your project square footage to calculate real-time client deltas and builder margins.
Room-by-Room Architectural Recommendation
Master Bedroom facing Main Road
Delivers superior acoustic soundproofing (up to 38 dB noise reduction).
Living Room Panoramic Balcony
Ultra-slim frames hold heavy 10-foot tall double-glazed sliding panels without sagging.
Coastal City Apartments (Mumbai/Chennai)
100% immune to salt-spray corrosion that attacks standard aluminium hardware.
Villa High-Ceiling Facades
Superior structural stiffness handles extreme cyclone wind pressure.
Frequently Asked Questions
Do uPVC windows turn yellow under harsh Indian summer sun?
High-grade uPVC profiles with >2.5 parts Titanium Dioxide (TiO2) per 100 parts resin are UV-stabilized and guaranteed against yellowing for 10–15 years.
Which window system provides better noise cancellation for Indian city traffic?
uPVC combined with Double Glazed Units (DGU) with unequal glass thickness (e.g., 6mm + 12mm gap + 4mm) breaks sound resonance frequencies best.
What is the wind load capacity of uPVC in high-rise towers above 30 floors?
uPVC profiles with internal galvanized steel reinforcement (1.5mm to 2.0mm thickness) easily withstand wind pressure up to 2,500 Pascals (Class 5 hurricane winds).
Model Your Project Upgrades Online
Calculate exact material quantities, wastage buffers, and difference billing with Mellite's free interactive calculator.