
Stella Rooflight is proud to be the first and currently the only manufacturer to achieve all six performance stars under the independent Rooflight & Roof Window Scheme (RRS).
Unlike conventional industry memberships, the RRS is an independent product verification scheme that assesses technical evidence against defined performance criteria. Its six stars recognise independently verified thermal performance, condensation risk, acoustic performance, solar performance, weather resistance and security.
Achieving all six stars demonstrates our commitment to transparency, technical excellence and independently substantiated performance claims, giving architects and specifiers greater confidence when choosing Stella Rooflights.
View our independent RRS verification
1. Thermal Performance
Independently verifies the rooflight's thermal efficiency (U-value), providing reliable, comparable information about heat loss and insulation performance.
2. Condensation Risk
Assesses the risk of surface condensation and the rooflight's ability to manage moisture, helping protect internal finishes and reduce condensation-related problems.
3. Acoustic Performance
Verifies the sound insulation of the complete rooflight assembly, helping reduce noise from traffic, aircraft and other external sources.
4. Solar Performance
Assesses solar heat gain and light transmission, helping specifiers balance natural daylight with effective solar control and reduced overheating risk.
5. Weather Performance
Evaluates resistance to wind and rain using assessment methods appropriate to roof glazing, providing confidence in performance under challenging weather conditions.
6. Security Performance
Verifies resistance to forced entry against defined security criteria, providing reassurance that security performance has been independently assessed.
What differentiates a Stella Conservation Rooflight from the others and makes it the most authentic is our attention to detail and the use of high quality materials.

Many so-called conservation rooflights are available, but only a few have low-profile steel frames.
Those that do often use modern plastic trays with glossy finishes. Using these materials makes it hard for such products to claim authenticity, as Victorians didn't have access to plastic.

Stella Conservation Rooflights use real wood liners from sustainable sources, durable stainless steel frames, and high-performance triple glazing.
This combination ensures a superior finish and a more environmentally conscious product for your project.

Stella Conservation Rooflights replicate the original Victorian design, helping maintain and preserve the heritage of period buildings.
They meet the requirements of local Conservation Officers and Building Control departments, ensuring both authenticity and compliance.

When selecting a rooflight, consider that most steel conservation rooflights are made from carbon/mild steel and rely on a protective coating.
Without it, they rust, break down, and eventually leak. While guarantees exist, they often require strict maintenance of the paint coating.
In contrast, all Stella rooflights use marine grade 316L stainless steel, which won't rust and ensures a lifetime of durability.

The amount of light entering a property depends on the internal viewable size, not the overall size of the rooflight.
Many believe that buying more glass increases the viewing area, but the clear viewable dimension is what matters.
We recommend checking the clear viewable dimension when choosing a rooflight, as it varies between manufacturers and significantly affects the light entering the building.

Stella Rooflights offer a high-specification powder coat for extra protection against the elements.
Unlike standard carbon steel rooflights, our marine grade 316L stainless steel frames don't rely solely on this coating to prevent disintegration.
This ensures long-lasting durability and resistance to the elements.



We would love to hear about your unique project! Contact us with your rooflight enquiry and our knowledgeable team will be pleased to help.