When designing a bright, open, and energy-efficient space, rooflights offer a transformative solution. However, the decision between polycarbonate vs glass rooflights can significantly influence aesthetics, performance, and long-term value. Whether you're a homeowner planning a home extension or a designer specifying materials for a modern build, choosing the right rooflight material is crucial.
At Skylights Roof Lanterns, we understand the importance of transparency—both literally and figuratively. This guide explores the benefits, limitations, and ideal applications of both polycarbonate and glass rooflights, comparing them across several key factors such as durability, insulation, and cost-effectiveness.
What Are Rooflights and Why Do They Matter?
Rooflights, also known as skylights or roof windows, are glazed openings in a building's roof that allow natural daylight to flood the interior. With an increased focus on energy efficiency, sustainable living, and aesthetic appeal, rooflights are no longer an architectural luxury—they’re a modern necessity.
Visit our rooflights collection to explore a wide range of designs that can elevate any living space.
Understanding the Materials – Polycarbonate vs Glass
What is Polycarbonate?
Polycarbonate is a tough, lightweight thermoplastic commonly used in roofing, bulletproof windows, and protective gear. It’s known for its impact resistance, UV protection, and lightweight structure, making it an excellent alternative to traditional glass in many applications.
What is Glass?
Glass, particularly tempered or laminated, has long been the gold standard for windows and roof glazing. It offers optical clarity, longevity, and a premium aesthetic, but is typically heavier and more costly.
Durability – Which Rooflight Lasts Longer?
Polycarbonate Durability
Polycarbonate sheets are virtually unbreakable. They can withstand:
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High-impact forces
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Hailstorms and debris
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Thermal expansion without cracking
Its high tensile strength makes it ideal for areas prone to severe weather or for installations where safety is a primary concern.
Glass Durability
While not as impact-resistant as polycarbonate, toughened glass used in rooflights is designed to endure everyday weather conditions. It may be prone to breakage under heavy impact, but offers:
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Scratch resistance
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UV stability without yellowing
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A long life span with minimal maintenance
Insulation Properties – Energy Efficiency at a Glance
Polycarbonate Insulation
Multiwall polycarbonate sheets provide excellent thermal insulation, thanks to air pockets between layers that reduce heat loss.
Advantages:
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Lower U-values than single-pane glass
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Ideal for cold UK climates
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Reduces energy bills by retaining warmth
Glass Insulation
Modern double or triple-glazed rooflights offer outstanding insulation, particularly when filled with inert gases like argon.
Benefits:
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Better sound insulation
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Less prone to condensation
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Compatible with thermal coatings
Explore high-performance glass rooflight solutions that meet current building regulations.
Cost-Effectiveness – Value for Money
Polycarbonate Rooflights
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More affordable than glass
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Lower installation costs due to light weight
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Less structural support required
Ideal for:
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Budget-conscious renovations
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Temporary structures
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Garden rooms or sheds
Glass Rooflights
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Higher initial investment
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Long-term value due to better insulation and aesthetics
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Adds to property resale value
Visit our rooflights range to compare pricing on glass options.
Aesthetic Appeal – The Visual Factor
Polycarbonate
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Tends to look more industrial
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Can cloud or yellow over time
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Less transparent than glass
Glass
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Crystal clear view
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Luxurious and modern finish
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Blends seamlessly with architectural elements
UV Protection and Light Transmission
Polycarbonate
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Built-in UV blocking layers
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High light transmission (up to 88%)
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Protects furnishings from sun damage
Glass
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Can include low-emissivity coatings
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Excellent clarity with natural light benefits
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Reduces glare with tinted or laminated options
Maintenance and Cleaning
Polycarbonate
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Scratches easily
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Requires special cleaners
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Can degrade if improperly cleaned
Glass
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Resistant to most cleaning agents
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Doesn’t scratch easily
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Maintains clarity with less effort
Explore easy-to-maintain flat rooflights designed for UK homes.
Fire Safety Ratings
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Polycarbonate: Typically has a lower fire resistance rating; it may melt or deform under high heat.
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Glass: Especially toughened or fire-rated glass, can maintain its integrity and slow the spread of fire.
Environmental Impact and Sustainability
Polycarbonate
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Made from petroleum-based products
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Not biodegradable
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Can be recycled but not widely accepted in UK recycling streams
Glass
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Fully recyclable
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Longer life span reduces waste
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More environmentally friendly lifecycle
Best Use Cases – When to Choose What?
Choose Polycarbonate Rooflights If:
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You're building a garden room, shed, or conservatory
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You need a lightweight, impact-resistant material
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Budget is a major concern
Choose Glass Rooflights If:
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You’re enhancing a modern living space
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Energy efficiency and insulation are priorities
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You want premium visual and thermal performance
Explore premium glass rooflights and lanterns ideal for domestic and architectural use.
Planning Regulations and Compliance in the UK
In the UK, any rooflight installation must meet Building Regulations Part L (conservation of fuel and power) and Part B (fire safety). Glass options are more commonly compliant, especially in habitable rooms.
Consult with our experts at Skylights Roof Lanterns to ensure your choice meets local codes and energy performance standards.
Installation Considerations
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Polycarbonate is easier and faster to install due to its lightweight structure.
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Glass installations may require more structural support and professional expertise.
For a seamless, regulation-compliant install, choose from our ready-to-fit rooflight kits.
Final Verdict: Polycarbonate vs Glass Rooflights – Which is Better?
|
Feature |
Polycarbonate |
Glass |
|
Durability |
Excellent (impact resistance) |
Good (scratch resistant) |
|
Insulation |
Good |
Excellent |
|
Cost-Effectiveness |
High (low initial cost) |
High (better long-term ROI) |
|
Aesthetic Appeal |
Moderate |
Premium |
|
UV & Light Transmission |
Good |
Excellent |
|
Maintenance |
Moderate |
Easy |
|
Fire Resistance |
Low |
High |
|
Sustainability |
Moderate |
Excellent |
Both materials offer unique benefits, but glass rooflights are generally preferred for modern residential applications due to their insulation performance, visual appeal, and long-term value.
Explore our complete rooflights collection to find the perfect match for your project.
