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Custom Size Flat Glass
Rated 5/5 by customers
From
£657.04
ex. VAT
Based on the lowest‑priced size/spec. Price updates with selections

Your configuration

Custom Size Flat Glass

(Rated 5/5 by customers)

“Bespoke sizing meant no compromises or fillers.”
From
£657.04
ex. VAT
Based on the lowest‑priced size/spec. Price updates with selections
1: Length Step 1 of 7
1: Length
mm Length must be between 600mm and 3000mm
2: Width Step 2 of 7
2: Width
mm Width must be between 600mm and 2000mm
A minimum pitch of 2° is required to prevent water ponding on the glass leading to rapid dirt build up.
3: Frame Colour Step 3 of 7
3: Frame Colour
4: Kerb Step 4 of 7
4: Kerb
5: Ventilation Step 5 of 7
5: Ventilation
6: Opening Step 6 of 7
6: Opening
7: Pole Length Step 7 of 7
7: Pole Length
If purchasing multiple manually opening units or no pole is needed then this can be removed

Pricing not available for the entered dimensions

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

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

Current configuration
From £657.04 ex. VAT
£788.45 inc. VAT
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Made in the UK

10 yr warranty

3-5 day delivery

Product overview

Custom Size Flat Glass

The Custom Size Flat Glass Rooflight is a made-to-order double-glazed rooflight for project-specific flat-roof openings. Its clean, low-profile design brings natural daylight into the space below while maintaining a contemporary external appearance.

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Product formatThe Custom Size Flat Glass Rooflight is a made-to-order double-glazed rooflight for project-specific flat-roof openings.
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Project suitabilityA laminated inner pane is supplied as standard for additional overhead safety.
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Available specificationSelect the size, glazing, frame, kerb or opening options offered in the configurator for this product.
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Check before orderingConfirm dimensions against the prepared opening, kerb or builder’s upstand and review the relevant delivery and installation guidance.

Product details

The Custom Size Flat Glass Rooflight is a made-to-order double-glazed rooflight for project-specific flat-roof openings. Its clean, low-profile design brings natural daylight into the space below while maintaining a contemporary external appearance.

A laminated inner pane is supplied as standard for additional overhead safety. The sealed glazing unit is supported by a durable powder-coated aluminium frame, with the available kerb, ventilation and opening options selected in the product configurator.

Enter dimensions from the external edge of the prepared builder’s upstand and check every selection before ordering, as custom products cannot normally be changed once manufacture begins.

Benefits & features

What this product offers

The Custom Size Flat Glass Rooflight combines a clean, low-profile appearance with made-to-order dimensions and safety glazing for flat-roof applications.

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Custom dimensionsSuitable where a listed standard rooflight size does not match the required opening.
✓
Double-glazed constructionDesigned to provide dependable thermal performance for flat-roof extensions and living spaces.
✓
Powder-coated aluminium frameDurable, low-maintenance framing with a neat architectural finish.
✓
Configurable specificationSelect the available kerb, ventilation and opening options shown in the product configurator.

More product details

Made to measureSpecify dimensions to suit the prepared builder’s upstand within the available manufacturing range.
Laminated inner paneHelps retain the glass if damaged and supports safer overhead glazing.
Clean flat-glass finishA contemporary appearance with clear views of the sky and generous natural daylight.
Made-to-measure daylight for project-specific openingsThe Custom Size Flat Glass Rooflight combines a clean, low-profile appearance with made-to-order dimensions and safety glazing for flat-roof applications.
What it means for your projectFeatureProject benefitCustom dimensionsSuitable where a listed standard rooflight size does not match the required opening.Double-glazed constructionDesigned to provide dependable thermal performance for flat-roof extensions and living spaces.Powder-coated aluminium frameDurable, low-maintenance framing with a neat architectural finish.Configurable specificationSelect the available kerb, ventilation and opening options shown in the product configurator.
Good to knowDimensions refer to the external builder’s upstand. Confirm the final size, glass and opening specification before ordering because made-to-order products cannot normally be amended once processing begins.
Good to knowAvailable sizes and options depend on the final product configuration.
Installation guidance

Plan the installation

Install the rooflight onto a square, level, insulated and fully weathered builder’s upstand in accordance with the official installation guide.

✓
MeasureConfirm the external dimensions of the prepared opening, kerb or builder’s upstand.
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PrepareEnsure the supporting structure is square, level, insulated and fully weathered before installation.
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Plan accessArrange safe access, unloading, lifting and handling for the delivered frame and glazing.
✓
Follow the guideUse the official installation instructions for the selected product and configuration.

Product-specific installation details

Prepare the opening before manufacture and deliveryInstall the rooflight onto a square, level, insulated and fully weathered builder’s upstand in accordance with the official installation guide.
Before ordering and installationCheckRequirementMeasureConfirm the external upstand dimensions match the size entered in the configurator.PrepareEnsure the upstand is square, level, insulated, weathered and ready for fixing.Plan accessAllow for the weight and fragility of the glass; arrange suitable labour or lifting equipment.Follow the guideUse the official installation instructions for the selected kerb and opening configuration.
HandlingKeep the glass protected during unloading and fitting. Do not alter the supplied frame or sealed glazing unit.
Professional installationUse a competent installer and complete all weathering and structural checks required for the project.
Before work beginsCheck the selected product, site conditions and official installation guide before work begins.
Lead times & delivery

Custom Flat Glass ordering guide

Custom dimensions and non-standard glass specifications are made to order.

10–15 working daysMinimum guide for unlisted sizes or non-standard glass.
Made to orderFinal timing is confirmed against the approved specification.
Confirm before paymentChanges cannot normally be made once manufacture begins.

Order type

Configuration Guide
Custom dimensions or non-standard glass specification 10–15 working days minimum
Large quantities or unusual requirements Confirmation required before ordering

Delivery and handling

Delivered kerbside with the glass and frame protected for transport. Free UK mainland kerbside delivery. Remote or restricted delivery areas require prior arrangement. Arrange suitable access and lifting help for unloading.
Please note

Remote or restricted postcodes require prior arrangement. Timing depends on the final approved specification.

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.
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Custom Size Flat Glass Rooflight
Worth it for the light alone. Added this during our flat roof lounge build to improve the overall feel of the extension. The result looks purpose‑made. The daylight spreads really evenly across the room.
Ethan | 6/15/2026 9:07 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 transformed the feel of your lounge extension and that the daylight spreads so evenly across the room. We really appreciate your feedback and your custom.
Custom Size Flat Glass
I was worried it would look bulky - it doesn’t. Bought for a hallway project to improve the overall feel of the extension. Bespoke sizing meant no compromises or fillers.
Beth | 5/15/2026 9:59 AM
Was this review helpful? Yes No (1/0)
A manager responded to this review
Thanks for taking the time to leave a review. We’re really pleased to hear the custom size flat glass rooflight worked well for your hallway project and achieved the clean, non-bulky look you were hoping for.

It’s great to know the bespoke sizing helped avoid compromises or fillers and improved the overall feel of the extension. We really appreciate your feedback.
Custom Glass Rooflights
Better than expected, especially once you see it installed. Bought for a hallway project because the room felt gloomy. The result looks purpose‑made. Fitting was smoother than expected. It looks premium once it’s in place.
Kieran | 1/26/2026 1:01 PM
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 finished result exceeded expectations and that the rooflight has made such a difference to your hallway project. It’s great to know the installation went smoothly and that the final look feels premium and purpose-made. We really appreciate you taking the time to share your feedback.
Reviews
Based on 3 reviews
6/15/2026 9:07 AM
Custom Size Flat Glass Rooflight
Worth it for the light alone. Added this during our flat roof lounge build to improve the overall feel of the extension. The result looks purpose‑made. The daylight spreads really evenly across the room.
Ethan
reply from Brett Martin
Thank you for your review. We’re delighted to hear the rooflight has transformed the feel of your lounge extension and that the daylight spreads so evenly across the room. We really appreciate your feedback and your custom.
Was this review helpful? Yes No (1/0)
5/15/2026 9:59 AM
Custom Size Flat Glass
I was worried it would look bulky - it doesn’t. Bought for a hallway project to improve the overall feel of the extension. Bespoke sizing meant no compromises or fillers.
Beth
reply from Brett Martin
Thanks for taking the time to leave a review. We’re really pleased to hear the custom size flat glass rooflight worked well for your hallway project and achieved the clean, non-bulky look you were hoping for.

It’s great to know the bespoke sizing helped avoid compromises or fillers and improved the overall feel of the extension. We really appreciate your feedback.
Was this review helpful? Yes No (1/0)
1/26/2026 1:01 PM
Custom Glass Rooflights
Better than expected, especially once you see it installed. Bought for a hallway project because the room felt gloomy. The result looks purpose‑made. Fitting was smoother than expected. It looks premium once it’s in place.
Kieran
reply from Brett Martin
Thank you for your review. We’re delighted to hear the finished result exceeded expectations and that the rooflight has made such a difference to your hallway project. It’s great to know the installation went smoothly and that the final look feels premium and purpose-made. We really appreciate you taking the time to share your feedback.
Was this review helpful? Yes No (1/0)
Only registered users can write reviews

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