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Flat Glass Rooflight Opening
Rated 5/5 by customers
From
£678.76
ex. VAT
Based on the lowest‑priced size/spec. Price updates with selections

Popular Configurations

These are the configurations most customers choose
All prices displayed are exc. VAT

Your configuration

Flat Glass Rooflight Opening

(Rated 5/5 by customers)
From
£678.76
ex. VAT
Based on the lowest‑priced size/spec. Price updates with selections
1: Size Step 1 of 6
1: Size
Need a custom size?
2: Frame Step 2 of 6
2: Frame
3: Kerb Step 3 of 6
3: Kerb
4: Ventilation Step 4 of 6
4: Ventilation
5: Opening Mechanism Step 5 of 6
5: Opening Mechanism
6: Pole Length Step 6 of 6
6: Pole Length

Sorry, the combination of options you have selected is not available. Please amend your choices and try again.

Current configuration
From £678.76 ex. VAT
£814.51 inc. VAT
Qty
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Made in the UK

10 yr warranty

3-5 day delivery

Product overview

Flat Glass Rooflight Opening

A popular configuration in our Rooflights & Skylights range, the opening double-glazed aluminium rooflight combines natural daylight with manual or powered ventilation for flat-roof spaces that aren't suited to a fixed flat glass rooflight.

✓Opening daylight solutionChoose the available manual or powered opening mechanism for controllable ventilation.
✓Thermally isolated aluminium framePowder-coated aluminium provides a slim, durable frame and helps reduce heat transfer.
✓Safety-glass constructionA toughened outer pane, argon-filled cavity and laminated Low-E inner pane are designed for overhead glazing.
✓Configuration-led deliveryListed opening sizes are typically five working days; unlisted sizes require longer.

Choose your specification

OpeningManual or powered, according to the product selector.
Kerb / upstandBuilder’s upstand, DF, 216 mm or 300 mm kerb where offered.
VentilationUnvented or manual trickle ventilation where offered.
Glass6 mm toughened outer pane, argon-filled cavity and laminated Low-E inner pane.
Listed opening sizes600×600, 750×750, 900×600, 900×900, 1000×1000, 1200×600, 1200×900, 1200×1200 and 1500×1000 mm.
InstallationFit to a correctly prepared, weathered builder’s upstand or selected kerb.

Where it works

Suitable where natural daylight and controllable ventilation are required, including kitchens, living spaces, offices and commercial interiors.

Installation and controls

Confirm the opening mechanism, control position and external opening dimensions before ordering. Follow the official installation and electrical guidance for the selected configuration.

Before ordering: The five-working-day guide applies only to listed opening configurations. Unlisted sizes and non-standard glass are a minimum of 10–15 working days.
Benefits & features

A sleek flat glass rooflight for modern daylighting

Brett Martin Flat Glass is a premium flat glass rooflight designed for flat roofs across modern residential and commercial buildings. It provides natural daylight, a clean internal finish and ventilation where specified.

✓
Minimalist appearance A modern flat glass design that blends neatly into the ceiling once installed.
✓
Thermal efficiency Thermally isolated frame and double glazing help support strong thermal performance.
✓
Enhanced overhead safety Laminated inner pane and non-fragility ratings provide reassurance for overhead glazing.
✓
Secure fixed models Fixed Flat Glass models hold Secured by Design accreditation.

Key benefits

Modern rooflight design Clean, stylish flat glass appearance for contemporary buildings.
Powder-coated frame Elegant aluminium frame powder coated to RAL 7016.
Low U-values Achieves U-values as low as 1.46 W/m²K depending on configuration.
Non-fragility ratings CWCT TN-67 Class 1 or 2 depending on size, and Class B non-fragile to ACR[M]001 when fully installed.
10-year warranty Supplied with a 10-year warranty for peace of mind.
EPD available BRE Globally Verified EPD available on specific configurations.

Product features

Fast delivery sizes Selected standard fixed sizes are available for fast delivery.
Kerb options Suitable for mounting to a builder’s upstand or PVC kerb in two height options.
Opening options Available in fixed, manual opening and powered opening formats.
Ventilation options Ventilation options are available depending on the rooflight configuration.
Hidden controls Powered opening rooflights include hidden actuators and cables for a clean internal appearance.
Special glass options Special glass specifications may be available on request.

Need help choosing the right Flat Glass option?
Select your size, opening format and kerb option above, or contact our team for advice.

Email our team
Installation guidance

Designed for secure installation on flat and low-pitch roofs

The Brett Martin Flat Glass Rooflight is engineered for straightforward installation onto a builder’s upstand or compatible PVC kerb. It is suitable for fixed, manual opening and powered opening formats.

✓
2° to 15° roof pitch The rooflight must be installed at a suitable pitch to allow rainwater to drain correctly.
✓
Builder’s upstand Designed to fit the outside dimension of a correctly prepared timber upstand.
✓
PVC kerb option Can also be installed with a compatible PVC kerb where specified.
✓
Fixed or opening formats Installation method varies depending on whether the rooflight is fixed, manual or powered opening.

Installation checklist

Check the roof pitch is between 2° and 15°.
Use the supplied pitch matrix to confirm the minimum pitch for the selected size.
Ensure the upstand is weathered, insulated and square before fitting.
Measure the upstand in multiple places to confirm the opening is accurate.
Follow the relevant installation guide for fixed, manual or powered opening variants.

Key measurement details

External upstand Rooflight size +40 / -20mm.
Internal upstand Rooflight size -150mm, with +30 / -0mm tolerance.
Minimum upstand height 75mm.

Important fitting note

Blinds fitted beneath the glazing can increase the risk of thermal stress. If blinds are used, choose light colours and allow suitable space and airflow between the blind and the glass.

Installation video

Watch the installation video below for a visual guide. The video should be used alongside the relevant official installation guide before fitting.

Need the full installation instructions?
Download the relevant Flat Glass installation guide from the Downloads tab before fitting.

View downloads

Brett Martin Daylight Systems operates a policy of continuous product improvement and reserves the right to alter specifications without notice. Every effort has been taken to ensure all details are correct at the time of release, but this information should be used only as a guide and does not form part of a contract or warranty. It is the customer’s responsibility to ensure the product is suitable for the actual conditions of use.

Lead times & delivery

Flat Glass Rooflight ordering guide

Service level depends on the size, opening mechanism and glass specification. Express orders must be placed before 12 noon.

24 or 48 hoursQualifying listed fixed configurations.
5 working daysListed manual or powered opening configurations.
10–15 working daysUnlisted sizes or non-standard glass, minimum guide.

Lead-time matrix

Configuration Guide Order limit
Qualifying standard fixed configuration 24-hour service Maximum 3 same-size units
Other qualifying standard fixed configuration 48-hour service Maximum 3 same-size units
Listed manual or powered opening configuration 5 working days Maximum 6 same-size units
Unlisted size or non-standard glass 10–15 working days minimum Confirm before ordering

Listed sizes (mm)

600 × 600 750 × 750 900 × 600 1000 × 1000
1200 × 600 1500 × 1000 900 × 900 1200 × 900
1200 × 1200 2000 × 1000 — —

Delivery and ordering

Free UK mainland delivery. Remote or restricted delivery areas require prior arrangement. Quantities above the stated limits, unusual specifications and restricted delivery areas require confirmation.
Please note

Lead times are manufacturing guides rather than guarantees and depend on final configuration and availability.

Product FAQs

Flat glass rooflight questions

Clear guidance on configuration, measurement and installation before ordering.

What is the difference between fixed and opening rooflights?

A fixed rooflight provides daylight without ventilation. Opening options add manual or powered ventilation where offered in the product selector.

Which glazing options are available?

Available glass type, tint and safety-glazing options depend on the selected product and size. Use the product selector for the current specification.

What do the product dimensions refer to?

Dimensions refer to the external builder’s upstand unless the product guidance states otherwise. Check the measuring guide before ordering.

How should the rooflight be installed?

Install onto a correctly prepared and weathered builder’s upstand, using a competent contractor and the official installation guide.

Need help?Confirm unusual sizes, opening requirements or site constraints with the Daylight Systems team before ordering.
Write your own review
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Flat Glass Rooflight Fixed
It’s exactly what we wanted: light, clean lines, and a premium feel. Bought for a garden room project to brighten the space. Opens smoothly and feels secure. Very happy overall.
Marc | 6/15/2026 9:13 AM
Was this review helpful? Yes No (1/0)
A manager responded to this review
Thank you for your review. We’re delighted to hear the rooflight has helped brighten your garden room and delivered the clean, premium feel you were looking for. It’s also great to know the opening feels smooth and secure. We really appreciate your feedback.
Reviews
Based on 1 review
6/15/2026 9:13 AM
Flat Glass Rooflight Fixed
It’s exactly what we wanted: light, clean lines, and a premium feel. Bought for a garden room project to brighten the space. Opens smoothly and feels secure. Very happy overall.
Marc
reply from Brett Martin
Thank you for your review. We’re delighted to hear the rooflight has helped brighten your garden room and delivered the clean, premium feel you were looking for. It’s also great to know the opening feels smooth and secure. We really appreciate your feedback.
Was this review helpful? Yes No (1/0)
Only registered users can write reviews

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