Casement window prices are mainly affected by four factors: the aluminum frame, the glass package, the hardware system and the window size or opening design. A cheaper quote usually means thinner profiles, simpler glass, lower-grade hardware or fewer operable sashes. A higher quote may include thicker aluminum, thermal break profiles, Low-E or laminated glass, multi-point locking hardware and stronger corrosion protection.
For buyers, the key point is simple: do not compare only the square-meter price. Two casement windows of the same size can have very different costs if their frame thickness, coating, glass structure, hardware brand, opening sash quantity or installation requirements are different.