Typically 40–50% less than glass equivalents — and the savings aren't just in the roofing material. Because polycarbonate is lighter, the supporting aluminium frame doesn't need to be as heavy-duty either. For a 4m × 3m veranda, the overall saving can be significant — making it an accessible way to get a quality, weatherproof outdoor space.

Significantly lighter than glass, meaning the supporting frame doesn't need to be as substantial. Can make installation more straightforward in certain situations.

Extremely impact-resistant — far more so than glass. If your property is under trees that drop branches or in an area prone to hail, that resilience is a genuine practical benefit.

Quality polycarbonate blocks up to 99% of harmful UV rays while still allowing natural light through — brightness without the sunburn.

When it rains, polycarbonate produces a noticeable drumming sound. Heavy rain can make conversation underneath difficult. Some people find it charming — others less so. Worth considering based on how you plan to use the space.

Despite UV coatings, standard polycarbonate gradually yellows and can become cloudy over 10–15 years. Premium UV-stabilised sheets resist this for longer. The material remains structurally sound well beyond this point, but the appearance change is something to be aware of.

Softer than glass and can pick up surface scratches during cleaning if the wrong tools or products are used.

Looks clean and functional, but doesn't have the same architectural quality as glass. For some projects that matters; for others it's less of a concern.

The difference that surprises people most. Glass roofs are significantly quieter than polycarbonate during rainfall — a noticeable difference. For outdoor dining, entertaining, or a peaceful retreat, this really matters.

Unobstructed views of the sky that never yellow or degrade. The view on day one is the same view you'll have decades later.

The glass itself lasts decades without any change in appearance or performance. Seals and gaskets may need occasional maintenance over time, but the glass remains as clear as the day it was installed.

A refined, architectural quality that enhances a property's appearance — and resale value. Looks intentional and permanent rather than "added on."

Doesn't scratch as easily, and self-cleaning glass — which uses a special coating that reacts with UV light to break down organic dirt, then relies on rainwater to wash it away — is available and most effective on roofs with good sunlight exposure and adequate pitch. It reduces maintenance significantly, though doesn't eliminate it entirely.

Additional choices including tinted glass (reduces glare and heat), self-cleaning glass, and solar control glass (reflects heat while allowing light through).

Typically 70–100% more than polycarbonate for the same size — due to material cost, the stronger aluminium frame required to support the additional weight, and more complex installation.

Requires a more substantial supporting frame, slightly increasing the overall footprint and weight.

Toughened glass is incredibly strong and safe — crumbles into small granules rather than sharp shards if it does break. Breakage is extremely rare in practice, but polycarbonate has the edge on pure impact resistance.