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Quick Product Snapshot
Key Information at a Glance
Opening Style
Fixed circular rooflight
Frame Material
Thermally isolated aluminium frame with optional insulated GRP kerb
Best Suited For
Flat roof extensions, hallways, landings, bathrooms and feature daylight spaces
Glazing Options
Double-glazed circular glass unit with specialist glass options available depending on project requirements
Energy Performance
Overall rooflight U-values available from approximately 1.16 W/m²K, depending on size and kerb option
Security
Laminated inner pane and concealed fixing approach for a secure, robust rooflight installation
Warranty
10-year Brett Martin product warranty available
Design & Options
Circular Glass is designed for projects where the rooflight should be a visible design feature as well as a source of daylight. Its round shape, clean internal appearance and slimline exterior make it a good choice when a square or rectangular unit would feel too ordinary.
✓ Available in a range of circular sizes for different room layouts and roof openings.
✓ Can be mounted to a builder’s upstand or supplied with an insulated GRP kerb.
✓ The round profile creates a softer, more architectural ceiling detail.
✓ Special glazing options can be considered depending on daylight, privacy and solar-control needs.
✓ Best used as a single feature rooflight where the shape will be part of the finished design.
Why choose BRETT MARTIN Circular Glass
Circular Glass is ideal when you want a rooflight that does more than simply add daylight. Its round shape softens the look of flat roof extensions and creates a design feature that feels more considered than a standard square unit. It works especially well where natural light is needed in a central space, hallway or room with limited wall glazing.
Key Features
Distinctive circular design
for a standout daylight feature
Slim, clean internal appearance
for a neat ceiling finish
Thermally efficient glass unit
for better year-round comfort
Available in multiple sizes
to suit different spaces
Performance & Comfort
Designed for flat roof applications, Circular Glass combines a thermally isolated frame, efficient glazing and a laminated inner pane for everyday comfort and peace of mind. It is a practical way to improve daylight while keeping the finished look refined, secure and low maintenance.
Energy Efficient
Overall Urc values from 1.16 W/m²K with GRP kerb.
Enhanced Security
Laminated inner pane improves safety below.
Weather Resistance
Designed for 2°–15° flat roof pitches.
Acoustic Comfort
38 dB Rw direct airborne sound insulation.
Are BRETT MARTIN circular glass lanterns right for your property?
Choose Circular Glass when you want the rooflight itself to become part of the design, not just a source of daylight. It works particularly well over stairwells, hallways, bathrooms and central spaces where a square rooflight may feel too predictable. The rounded shape helps soften modern flat roof extensions and can create a more considered architectural feature above the room.
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