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Made in UK

Thermal Performance

Building Regulation Compliance

Easy Fit


Flat Skylights Brett Martin

Skylights Roof Lanterns offer an outstanding flat roof skylight for any home or business. Our conservation rooflight is built to last and with its U-Value Centre Pane of 1.1 W/m2K, it offers superior thermal efficiency compared to other double-glazed windows.

A flat roof window from Brett Martin means you can enjoy natural light without compromising on energy efficiency. In addition, our product has been designed to be easy to fit and maintain, meaning that you get a bright new living space without the hassle of installation or maintenance.

We also offer an extensive 10-year warranty for total assurance that your flat roof window will stand the test of time. Whether you are looking for a single conservatory skylight or crafting the perfect attic conversion, Brett Martin’s flat roof lights will provide your home with the extra natural light it needs at an unbeatable price. For quality and performance combined with unbeatable value, choose a Flat Skylight by Brett Martin today.

With innovative design features and long-lasting durability, our flat roof skylights are the perfect addition to any home or business. Let us bring natural light into your life today.

Get in touch with us for more information about our flat roof lights, and see how we can help you get the most out of your living space!

Fitting and Measurements

The product data sheet and instructions for installation in PDF form to download can be found at the foot of this page.

The size you select to order should match the final dimensions of your external upstand. For example, an external upstand measuring 1000mm x 1000mm would require a purchase measuring 1000mm x 1000mm.

The width of your upstand should measure 75mm.

There is a 20mm margin already built into our roof light design dimensions. This means that if your external measurements were 1020mm x 1020mm, it would still be suitable for a 1000mm x 1000mm fit.


Fixed Flat Glass Rooflight = rooflight size (External Upstand) +20/-0mm

Self-clean glass is only fully effective when used with pitches of 10 degrees or greater. Please get in touch if you would like to include this option.

To fit this flat roof skylight a minimum pitch of 2 degrees is needed. For some larger sizes of Brett Martin Flat Glass a minimum of 4 degree pitch is required. The maximum pitch should be 15 degrees.

Fitting Video Guide


Additional options:

The following options may be selected for the glass on the non-opening flat roof windows:

  • Solar control: An advanced coating is applied to the class which minimises the heat which penetrates the building
  • Easy clean/self-clean: Coated to decrease the frequency and time required to clean the class
  • Satin: Allows light to permeate but provides an extra degree of privacy
  • Grey tint: the glass is tinted grey

Stippolyte: an opaque glazing which offers heightened privacy. Typically used in rooms or spaces which are overlooked from neighbouring buildings or from the exterior. The textured glass finish on Stippolyte will alter the light distribution.

  • Premium flat roof skylight
  • Stronger flat roof windows
  • Includes aluminium frame with powder coating (RAL 7016)
  • U-Value Centre Pane 1.1 w/m2K
  • Thermally broken for superior energy efficiency

Specification of Standard Glass

  • Total thickness: 32.4mm
  • Transparent glass toughened top pane 6mm
  • 90% Argon filled cavity 20mm
  • Low-E soft-coated laminated inner glass

The lower pane of glass will be laminated and measure 8.8mm, 9.5mm, or 11.5mm where the size exceeds 1000 x 2000.

Further Information:

  • Unit: 10-year guarantee
  • Insulated glass: 5-year guarantee

Although a ten-year guarantee applies to the unit, the life-span is expected to be significantly longer with no perforation, distortion, loss of weather-tightness or deterioration in structural efficiency for approximately 20 years.


The production times are listed below and apply to standard flat roof windows. Where additional opens such as solar control, satin or self-clean glass has been selected, the timescales quoted below would be extended. Please contact us for more information when placing your order.

On delivery, please ensure there is a suitable person present who is able to unload the flat roof windows from the lorry. The driver will be unable to assist in any way or deliver the items inside. This is due to insurance purposes.

Any equipment or installation arrangements should be made once the item has been successfully delivered.

Deliveries to Ireland may take longer; please get in touch for more information.

Production 2-3 working days:

  • 600 x 600
  • 750 x 750
  • 900 x 600
  • 900 x 900
  • 1000 x 1000
  • 1200 x 600
  • 1200 x 900
  • 1200 x 1200
  • 1500 x 1000

Production 5 working days:

  • 2000 x 1000

Production 2-3 weeks:

Lead time for all other sizes are 2-3 weeks


TB406 Datasheet Standard Flat Glass Rooflight
Installation Guide
CAD Drawings