A roof lantern is a three-dimensional architectural glazing structure, typically mounted on a flat or low-pitched roof, designed to introduce vertical natural light into interior spaces. For those wondering what is a roof lantern, it can be defined as an elevated glass structure—similar in concept to a skylight but engineered with a pitched, often faceted frame—that maximises illumination, enhances spatial perception, and significantly improves thermal performance through advanced glazing technologies. According to the National Association of Rooflight Manufacturers (NARM), high-spec roof lanterns can reduce reliance on artificial lighting by up to 30%, while meeting U-value targets below 1.2 W/m²K.
Originally inspired by classical glass-roofed conservatories, modern roof lanterns now incorporate aluminium or timber composite frames with thermally broken profiles, argon-filled double or triple glazing, and low-emissivity coatings. These features ensure not only visual elegance but also insulation integrity, solar control, and condensation prevention.
Today’s roof lanterns are engineered to be more than design statements—they’re key passive environmental elements, says James Whitlow, Senior Technical Advisor at the Chartered Institute of Building Services Engineers (CIBSE). As such, roof lanterns need know considerations extend beyond aesthetics: factors like wind load, ventilation integration, and structural waterproofing must be evaluated during planning and installation.
Whether retrofitting a heritage property or specifying glazing in a new-build extension, roof lanterns offer a compelling combination of energy efficiency, daylight optimisation, and architectural enhancement.
What Are Roof Lanterns?
Roof lanterns are more decorative than skylights and are best described as raised glass structures placed on flat or sloped roofs. As a significant architectural piece, roof lanterns provide elevation and are designed specifically to stand out and not just serve as a source of illumination.
- Definition & Design: Roof lanterns are composed of a sturdy frame that consists of several glass panes designed to catch light from several directions, forming the core of roof lantern construction details. All angles capture light, making roofs perfectly illuminated. In addition to pleasant lighting, the interior achieves a spacious feel, devoid of any constraining atmospheres.
- Versatility in Application: Roof lanterns offer a wide range of uses as they are commonly found in conservatories, orangeries, roof lanterns for flat roofs, and even in modern extensions. They turn a room into a bright, welcoming space and bring energy benefits while looking aesthetically appealing.
How Do Roof Lanterns Work?
Modern roof lanterns eliminate the need for artificial lighting by capturing and diffusing daylight to interiors, thus improving the ambiance.
Structural Composition
They consist of a framework with several glass sheets and panels. This arrangement captures light from various directions throughout the day, ensuring consistent indoor illumination.
Light Diffusion
Modern roof lanterns often include ventilators, aiding in temperature control and airflow. This is especially useful in hot climates or enclosed areas where condensation can be problematic.
Types of Roof Lanterns
Roof lanterns vary based on materials and functionality. Here are the primary types:
1. uPVC Roof Lanterns
- Affordability & Efficiency:
uPVC is a budget-friendly material that still maintains decent quality. It is lightweight, simplifying installation and reducing structural support needs. - Low Maintenance:
uPVC is weather-resistant and requires minimal maintenance. Available in various finishes (white, grey, woodgrain), it allows for versatile design options.
2. Aluminium Roof Lanterns
- Modern Appeal & Durability:
Aluminium is ideal for supporting large glass panes due to its strength and lightness. It enables slimmer frames while offering robust durability. - Custom Finish Options:
Aluminium frames can be powder-coated in various colors to match any architectural style.
3. Timber Roof Lanterns
Timber offers a classic, natural aesthetic perfect for heritage homes, ideal for traditional lantern roof design schemes. Its insulating properties help maintain indoor temperatures, though it requires regular maintenance to withstand weather exposure.
4. Fixed vs. Opening Roof Lanterns
- Fixed Roof Lanterns:
Non-opening models that provide lighting only. They’re simpler to build and perfect where ventilation isn’t a concern. - Opening Roof Lanterns:
These lanterns open manually or electronically, providing both light and airflow.
Benefits of Roof Lanterns
When evaluating the pros and cons of roof lanterns, it’s clear they offer a wide range of functional and aesthetic advantages:
- Maximizes Natural Light:
They allow daylight from multiple angles, reducing the need for artificial lighting and lowering energy bills. - Enhances Aesthetics:
Roof lanterns act as architectural focal points, bringing modern elegance to any room. - Improves Energy Efficiency:
Natural lighting and ventilation reduce heating, cooling, and lighting needs—contributing to overall energy efficiency. In fact, according to this energy efficiency study on daylighting benefits by the American Council for an Energy-Efficient Economy (ACEEE), incorporating skylights and advanced daylighting systems can reduce lighting energy usage by up to 58% in retail spaces and 26% in office buildings. - Increases Property Value:
A roof lantern adds luxury and functionality to a space, increasing property market value. - Better Ventilation:
Opening lanterns enhance airflow and reduce indoor humidity and condensation issues.
How Much Do Roof Lanterns Cost?
Several factors influence roof lantern costs:
Cost Factors
Material:
uPVC is the most affordable; aluminium and timber cost more due to their aesthetic and performance.
Size:
Larger lanterns require more materials and stronger structural support.
Glazing Options:
Double and triple glazing improve insulation but increase costs.
Customization:
Extras like automation, smart glass, or colored frames also raise prices.
Average Price Ranges
| Roof Lantern Type | Price Range |
| uPVC Roof Lantern | £1,000 – £2,500 |
| Aluminium Roof Lantern | £2,000 – £5,000 |
| Timber Roof Lantern | £3,000 – £6,000 |
Note: Final costs may vary based on region, contractor rates, and optional features. You can use a roof lantern cost calculator for more accurate budgeting tailored to your specific needs.
How to Install Roof Lanterns: Step-by-Step Guide
While experienced DIYers might handle the task, professional installation is recommended for best results.
Step 1: Measuring the Roof Opening
Assess and mark the space for accurate placement of the lantern.
Step 2: Preparing the Roof Structure
Reinforce the installation area with additional supports or braces for stability.
Step 3: Installing the Frame
Position the weather-sealed frame securely to prevent water ingress.
Step 4: Fitting the Glass Panels
Place glazed panels precisely, ensuring a tight and secure fit.
Final Touch: Sealing & Finishing
Apply final weatherproofing and cosmetic finishing for aesthetics and durability.
DIY vs. Professional Installation
DIY Installation
Suitable for those with prior construction experience and small-scale projects.
Professional Installation
Ensures compliance with structural regulations, weatherproofing, and safety standards. It typically includes warranties and reduces the risk of costly errors.
If you’re also considering modern roof glazing solutions that complement sliding doors, explore our premium range of roof lanterns for high-quality options.
Planning Permission for Roof Lanterns
In most cases, roof lanterns fall under permitted development and don’t require planning permission. However, exceptions include:
Listed Buildings & Conservation Areas
These may have specific restrictions or approval requirements.
Height Restrictions
Lanterns projecting more than 150mm above the roofline may need approval.
Boundary Proximity
If close to property lines, lanterns may impact neighbor privacy and require permission.
Always check with your local planning authority.
Maintenance & Durability Tips
To maximize lifespan and maintain appearance:
- Washing: Use soft cloths and mild soapy water to clean glass panels regularly.
- Examine Seals & Joints: After extreme weather, inspect for cracks or leaks.
- Lubricate Opening Vents: Keep moving parts working smoothly with occasional lubrication.
- Prevent Condensation:
Use dehumidifiers and improve ventilation if needed.
Best Roof Lantern Brands & Suppliers
Top-quality brands known for performance and innovation:
- Atlas Roof Lanterns: Renowned for modern aluminium designs with minimal frames and maximum light. Also consider Korniche roof lights, which are known for their sleek engineering and thermal efficiency.
- Korniche: Slimline, thermally efficient lanterns that balance aesthetics and performance. Their Korniche aluminium roof designs are especially suited for modern builds.
- Skypod: Affordable uPVC roof lanterns with sleek styling for various budgets.
- Eurocell: Offers customized lanterns with diverse glazing and frame options.
Conclusion
Roof lanterns offer unmatched benefits—from natural lighting and improved aesthetics to energy savings and added property value. Whether you choose cost-effective uPVC, sleek aluminium, or elegant timber, a roof lantern can dramatically transform your space—just don’t confuse them with sky lantern decor, which serves a completely different purpose.
Expert installation and proper maintenance with IDL WIndows, roof lanterns become lasting, standout features in any property.
Explore your design preferences, set your budget, and consult a professional to find the ideal match between rooflights, pitched roof windows, or roof lanterns. For quality options and free quotations, get in touch today and bring light into your life—beautifully.