This draft is for visual review. It offers a decision framework only; project-specific selection requires approved system information and site review.
Start with the opening
Consider the clear opening, operation, access and cleaning needs. Sliding and casement layouts respond differently to room planning and available space.
Compare system context
uPVC and aluminium are distinct frame materials with different profiles, finishes and detailing options. Compare the exact system, glazing and hardware that can be specified for the project.
| Decision | What to review |
|---|---|
| Frame proportion | Sightlines, opening size and structural support |
| Site exposure | Orientation, weather and maintenance access |
| Operation | Daily use, ventilation and cleaning |
| Glazing | The glass build-up required for the intended use |
No single material is the right choice for every opening. A measured opening and a complete system specification make the comparison useful.