Where the choice becomes clear
PVC offers strong insulation and often suits conventional replacement openings. Aluminium provides strength and slimmer sightlines where glass areas are larger.
PVC and aluminium compared
Neither material is automatically better for every opening. Compare the complete frame, glass, hardware and installation rather than the material name alone.
| Consideration | PVC | Aluminium |
|---|---|---|
| Insulation | Naturally low-conductivity frame material | Choose a thermally broken system where frame insulation matters |
| Larger spans | Often used for conventional window sizes | Strength suits wider windows and sliding doors |
| Sightlines | Profiles are usually broader | Slimmer profiles can preserve more glass area |
| Finish | Common colours and selected foil finishes | Broad choice of powder-coated colours |
| Typical use | Bedrooms and conventional replacement openings | Large openings, modern frames and terrace doors |
Compare complete systems
A well-specified system in either material can outperform a weakly specified alternative.
- Frame and reinforcement
- Glass specification
- Hardware and seals
- Installation and finishing
Use the opening as the starting point
Bedrooms, broad patio openings and exposed sea-facing elevations may reach different answers in the same house.
