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Made in UK

Thermal Performance

Building Regulation Compliance

Easy Fit


Opening Rooflights

The Opening Rooflight by Brett Martin allows you to enjoy abundant natural light when you want it. This opening rooflight gives your living space a modern and minimalist feel, optimizing the available light for an illumination experience like no other.

Whether you prefer manual or electric, this Opening Rooflight provides both options with its unique design. Electric operation requires a mains power connection and the option of a rain sensor or remote control to operate. The manual version uses a worm gear with pole (sold separately).

Explore the Opening Rooflight by Brett Martin today and enjoy the perfect balance of light and style in your living space. Enjoy natural light on demand with this opening skylight for flat roof. Make your space brighter and more inviting with the Opening Rooflight by Brett Martin.

The Opening Rooflight by Brett Martin is the perfect addition to any living space, bringing modern style and natural light together in an effortless manner. Our Opening Rooflight provides you with a choice of manual or electric operation for ultimate convenience. With light streaming through your Opening Rooflight, you can enjoy the perfect balance of style and illumination in your home.  Experience the Opening Rooflight by Brett Martin today!

Frequently Asked Questions

What sizes are available for opening rooflights?

We offer a variety of sizes for our opening rooflights and all of our opening rooflights - whether electric or manually operated - are built to order. That means you will need to be absolutely certain about the size and style you want before placing your order. Because they are only produced after your order is confirmed there are no returns or refunds and no do-overs.

Do I have any glazing options or is the glass on every opening rooflight the same?

We offer our customers a range of glazing options that will help maximise the utility of each opening rooflight. For example, we can apply a special coating to the window that will minimise the amount of heat that passes through it. We can apply a simple grey tint that will cut down on the amount of visible light passing through the window. We can apply a satin coating to the glass that will allow sunlight to penetrate but will help ensure your privacy. Or you can choose rooflights that are coated to decrease how often you will need to clean them.

Do you offer an installation service for flat rooflights?

We do not provide installation of the rooflights we sell. However, we do provide detailed start-to-finish instructions that will enable any contractor or experienced do-it-yourselfer to install these beautiful rooflights. If, for some reason, you believe the documentation that comes with your rooflights is insufficient you should feel free to contact our customer service department and tell them what kind of information you're looking for. They will go the extra mile to provide it to you.

Do I need planning permission to install opening rooflights?

Whether you will need planning permission or not will depend on several things. As a general rule, anything installed on the roof that protrudes above the existing roof line will need planning permission. And since our opening rooflights do protrude a bit it is possible you'll need planning permission. In most cases, however, receiving permission is a straightforward process. Also, if your home is a listed building or it is located in a conservation area, it will almost always need planning permission before you add anything to the roof. 

Do you offer a warranty on your opening rooflights?

We stand behind every rooflight and skylight we sell, so of course we offer a generous warranty on all our opening rooflights. To learn more call us today on 020 4538 3079.

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 40mm margin already built into our opening roof light design dimensions. This means that if your external measurements were 1040mm x 1040mm, it would still be suitable for a 1000mm x 1000mm fit.


Opening Glass Rooflight = rooflight size (External Upstand) +40/-20mm

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.

A minimum pitch of 2° is required to prevent water ponding on the glass leading to rapid dirt build up. For some larger sizes of Brett Martin Flat Glass a minimum of 4° pitch is required. Customers may install at lower pitch, but this is likely to result in water pooling on top of the glass.

For an additional cost, we can provide a PVC upstand for items which need to be fixed onto the builders upstand. Prior notice is required so please get in touch before ordering if this applies.

Fitting Video Guide

Fitting Video Guide


Additional options:

The following options may be selected for the glass on the opening flat skylight:

  • Solar control: A special 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:

  • Electric actuators (where fitted): one-year guarantee
  • Unit: 10-year guarantee
  • Insulated glass: 5-year guarantee

Actuators are designed to last a minimum of 10,000 cycles. 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 time for this flat roof skylight is 3-5 working days if no extra options are selected.

The time needed for production will increase by 2-4 weeks if options such as solar control, satin or self-clean glass are requested. Please contact us if you would like to add any of these components.

Please ensure that on delivery 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.


TB403 Datasheet Brett Martin Flat Glass_NGks5uL
TB402 Manual Opening Rooflight
TB401 Electric Opening Rooflight
CAD Drawing