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Made in UK

Thermal Performance

Building Regulation Compliance

Easy Fit


Circular Rooflight

Architects are increasingly turning to circular rooflights to make a visual statement in contemporary interior designs. Brett Martin Circular Glass stands out as a premium round rooflight, sought after for its unique style. It's offered in various sizes for mounting onto a builder's upstand or as a complete unit with a pre-fabricated kerb. This modern glazing solution offers a sleek internal appearance, a subtle exterior presence, and evenly spreads daylight throughout interior spaces.

Fitting and Measurements

Please refer to the installation guide in the ‘Downloads’ tab on this page.

When buying a 900mm diameter rooflight from the website for installation on your own upstand, ensure that the external upstand dimensions match the 900mm diameter. Opting to purchase with a GRP kerb at the same size of 900mm means that your structural opening should also measure 900mm.


Please refer to the Data Sheet in the ‘Downloads’ tab on this page.

  • Modern and stylish circular flat glass rooflight design
  • Elegant aluminium frame powder coated to RAL 7016
  • Ur Value as low as 1.16 W/m2K
  • Safety of those below the rooflight assured thanks to a laminated inner pane
  • Tested to be non-fragile to CWCT TN-67 for class 1 roofs and Class B non-fragile to ACR[M]001 when new and fully installed to Brett Martin Daylight Systems installation guides
  • Available in a range of sizes, with 4 standard fixed sizes
  • Suitable for mounting direct to a builder’s upstand, or with robust insulated GRP kerb for new build and refurbishment applications
  • The product is supplied with a 10-year warranty.


Currently, we recommend a lead time of 3-5 working days for this product when purchased without a kerb, and 10 working days when purchased with a GRP Kerb. Please ensure that there is adequate labour available on-site to receive and sign for the product upon delivery. All sizes are custom-made and cannot be returned. Kindly double-check the size before proceeding with your purchase.


TB426 Datasheet Brett Martin Circular Glass
TB425 Installation Brett Martin Circular Glass Rooflight
CAD Without Kerb and With Kerb