Treforest Korniche Roof Lantern

A revolutionary thermally broken aluminium roof lantern has arrived.

The brief: To design a new roof system that is…

SLIM - Aesthetically Stunning

STRUCTURALLY ELEGANT - Optimised to allow minimal structure

STRONG - Strongest and stiffest roof lantern assembly on the market

WARM - Class leading thermal performance

Please contact our glazing team if you require more information or would like a free survey.

Treforest Slimline Korniche roof lantern provides a traditional timber look with all the advantages of a thermally broken aluminium construction. Precision engineering, optimisation and modern manufacturing technicians have created a beautifully proportioned, structurally elegant, thermally efficient, strong and secure lantern solution for your home.

With complete roof u-values from 1.0 - 1.2w/m2k our Korniche lantern provides your home with a room that is comfortable all year around.

Strong and Secure

Our Korniche roof lantern has been optimised to create the strongest and stiffest roof lantern possible with minimal structure to obscure your view. Unparalleled in strength our lantern roof can survive whatever nature throws at it. Put into perspective a 6m x 4m Korniche roof can support over 8 tones. Almost twice that which other lantern roofs can tolerate.

More glass, less roof

Design optimisation ensure that our Korniche lantern has the largest glass span and the fewest rafters currently available from any other system on the market.

Highest Quality Weatherproofing

Providing the last word in weather protection our Korniche lantern uses the best seals and gaskets available throughout, ensuring complete peace of mind in the most extreme conditions.

Our innovative glass lock system and tamper proof fasteners keep everything tightly in place and once finished the capping`s are fitted, there are no visible fasteners anywhere to be seen.

Thermal efficiency of our roof has been guaranteed by the elimination of cold bridging, this is achieved by the total isolation of the external aluminium profiles from the internal ones. When combined with high performance glazing, the Korniche’s ability to reduce heat transfer is in a class of its own.

If delivery with glazing is required, we can offer many industry leading, high performance self-cleaning glass options. Choose from either blue, neutral, clear or aqua and with U Values ranging from 1.0 – 1.2.

Structural Elegance

Our slim elegant Korniche lantern fits perfectly in any home by retaining traditional features in a contemporary setting.


Slim Sections - at only 57mm wide, the spas and ridge sections are among the slimmest on the market. Coupled with our sculpted bosses they provide a look usually associated with timber constructions.

Traditional Meets Modern - Narrow yet deep structural profiles with subtle ogee detailing along the lower edges provides a clean classic feel

Hidden Fixings - Fully concealed fixings ensure sight lines flow gracefully and uninterrupted throughout, bringing unrivaled elegance and balance.

Attention to Detail - Attention to detail is present throughout, from the engineered structure and bespoke weather seals, the innovation glass locks all the way to the logo embossed end caps.

The Finishing Touches - Every component used has been developed to work in harmony with the others and enhance the overarching design. Treforest`s Korniche Lantern is the best possible finish for your extension. 

Range of Colours - Our standard colours are Gloss White, Matt Anthracite Grey and Matt Black these can be chosen in any combination of inner and outer.

We can also supply our roof in any bespoke colour of your choice. simply find the RAL or BS code.

If you require additional information please contact our glazing team