What Actually Determines Whether a Window Lasts 40 Years

Longevity is predictable.

Windows that last decades share the same traits:

• Stable frame materials.

• Proven hardware.

• Correct surface protection.

• Proper installation.

  
  

Steel resists movement. Aluminium relies on correct design and fixing.

Hardware quality affects daily use. Cheap components fail early and often.

Installation errors cause most long-term issues. Flashings, tolerances, and packers matter more than brochures.

A well-specified and well-installed South Island window should not be replaced within a single ownership cycle.

Anything less is planned obsolescence.