A system window's price is not a single quotation but is built from four dimensions - core material cost, processing and technology cost, installation service cost, and brand/after-sales premium - whose proportions vary slightly with positioning (mid-range or high-end). (1) Core material cost (40-60% of the total) determines the basic quality and is directly tied to thermal insulation, soundproofing and durability, and has three parts: profiles (30-40% of material cost), where the key factors are the profile series (e.g. 70/80/90 series - a larger number means a wider profile and more complex chambers, hence higher cost), the material (primary aluminium beats recycled, and imported system profiles cost 20-30% more than domestic) and the thermal-break strip (nylon 66 costs over 50% more than PVC and is standard for system windows); glass (25-35%), depending on configuration (double glazing below triple glazing, ordinary cavity below Low-E coated, single-silver Low-E below double-silver Low-E, each upgrade adding 15-25%) and thickness (5 mm below 6 mm, with special bullet-proof or fire-proof glass doubling the cost); and hardware (20-30%), the key to durability, where quality domestic hardware (e.g. Kinlong, HOPO) costs 30-50% more than unbranded, imported hardware (e.g. SIEGENIA, ROTO) costs 50-100% more than domestic, and tilt-and-turn hardware is about 20% dearer than ordinary casement hardware. (2) Processing and technology cost (10-20%) safeguards system compatibility, the very feature that sets a system window apart from an ordinary thermal-break window: system R&D amortisation (genuine system windows carry upfront R&D for chamber structure and hardware-to-profile matching, which 'pseudo system windows' avoid); precision processing (CNC corner-crimping and sealant-injection machines achieving corner glue injection and plus-or-minus 0.5 mm cutting accuracy, costing 30-50% more than ordinary thermal-break windows); and customisation (irregular sizes or special shapes may add 20-50% for tooling or manual adjustment). (3) Installation service cost (15-25%) decides whether the performance is actually delivered - 'three parts product, seven parts installation'; it covers labour (certified system-window installers earn over 50% more per day, the process is more complex and takes 30% more time), auxiliary materials (dedicated polyurethane foam, weather-resistant sealant and stainless fixings cost 20-40% more and are used in greater quantity), and on-site measuring and acceptance testing (accurate measurement plus air- and water-tightness tests). (4) Brand and after-sales premium (5-15%) ensures long-term use: first-tier brands (e.g. Schuco, YKK AP) carry a 20-40% premium for reputation and technology, and leading domestic brands (e.g. Huanpai, Xinnisi) 10-20% over regional brands; the after-sales portion includes in-warranty free repair (hardware replacement, gasket renewal) and periodic maintenance, whereas no-warranty 'bare-price' windows carry higher later repair risk.