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In stock and ready to dispatch

* All purchases include a FREE Easy Fit Kerb for hassle-free installation *



Introducing our...
F21L Frameless Triple-Glazed Flat Roof Window
with Seamless & Self-Cleaning Glass by Sunview Rooflights

Our Sunview Seamless Triple-Glazed Skylight is our most competitively priced and popular skylights. Available with triple-glazed toughened or laminated glass.

✓ Stunning seamless & modern design.
✓ Triple-glazed with three panes of toughened glass (laminated inner-pane on larger units).
✓ U-Value of just 0.81
✓ Self-clean Glass coating applied as standard.
✓ FREE Easy Fit Timber kerb.

The skylight is built to all relevant UK building standards - CE marked, BS EN 12150 C1 (Toughened Glass) BS EN 14449:2005 (For larger laminated units). The innovative seamless design means silicone is not exposed to the external elements.

Check out our video (above) highlighting the hassle-free installation process. With our Easy Fit Timber Kerb (recommended) - simply secure to your 70mm x 70mm upstand, apply silicone and lift the skylight into place.

Buy with confidence, buy direct. Based in the South East of England, we are one of the UK's largest skylight suppliers & stockists. We have a long established trading history and thousands of happy customers.

Our skylights are stored at our dispatch warehouse and are ready to dispatch with fast & free delivery (mainland UK only).




Find out more below.




To give optimal thermal performance, all skylights are triple-glazed as standard. Please note that for our smaller sizes we use a Toughened Inner Glass Pane and for our larger sizes we use a Laminated Inner Glass Pane.

Triple-Glazed Toughened Inner Glass Pane Specification
Applicable to the following smaller sized units: 300x300, 400x400, 400x1200, 500x500, 500x1200, 600x600, 600x900, 600x1200, 600x1500, 600x1800, 600x2000, 700x1200, 800x800, 800x1000, 800x1200, 800x1500, 800x1800, 800x2000, 1000x1000, 1000x1200, 1000x1500

- 6mm Toughened Outer Seamless Soft Coat Glass (with Self-Clean Coat)
- 16mm Black Spacer Argon Gas
- 4mm Toughened Soft Coat Glass
- 14mm Black Spacer Argon Gas
- 4mm Toughened Soft Coat Glass
- Overall thickness of 46mm | Weight: 35Kg/sqm

Triple-Glazed Laminated Inner Glass Pane Specification
Applicable to the following larger sized units: 1000x2000, 1000x2500, 1000x3000, 1000x4000, 1200x1200, 1200x2400, 1500x1500, 1500x2000, 1500x2500,1500x3000

- 6mm Toughened Outer Seamless Soft Coat Glass (with Self-Clean Coat)
- 16mm Black Spacer Argon Gas
- 4mm Toughened Soft Coat Glass
- 14mm Black Spacer Argon Gas
- 8.14mm Laminated & Toughened Soft Coat Glass
- Overall thickness of 47.14mm | Weight: 35Kg/sqm




We use Smartguard self-clean glass coating technology on the outer pane of the skylight.

The coating creates a smooth barrier on the outside pane of glass, which prevents build up of pollutants and helps rain droplets to wash them away.

Self-clean glass coating is not a substitute for proper maintenance and cleaning, but is the first barrier between the glass and dirt build-up.




Please remember the skylight size we quote is the internal size
The measurement we give for the skylight is the internal opening size / structural opening size. This should be the exact same as your roof opening, e.g. a 1000mm x 2000mm skylight will require a roof opening of 1000mm x 2000mm. If you are not using our kerb, please see the drawing on the listing images and make sure you account for the bottom-pane sizes.

Installation Notes
Skylight arrives pre-assembled and timber crated. 
You must add a fall of 80mm per 1000mm in accordance with the slope on the roof. 
FREE Easy Fit Timber Kerb screws into onto builder’s 70mm x 70mm upstand. 
Use supplied low modulus silicone
Roof covering (not included) required to apply to upstand. 
The use of arris rail at the bottom of the upstand is recommended.
We recommend keeping the skylight in the timber crate right up until the point 

Warranty Information 
All units must be handled, stored, and fixed in accordance with our installation guide. Any claim must be accompanied by a copy of the original purchase invoice. This warranty covers replacement of parts only. This warranty is available only to Electric Opening Skylights Limited customers only and is non-transferable. Glazing warranty cover: 20 years.




*IMPORTANT - READ BEFORE PURCHASING*

Postage Information

The FREE POSTAGE quoted is ONLY for those who live within Zone 1 (Mainland UK).

If you live OUTSIDE of Mainland UK, an additional postage surcharge will be applied, determined by the skylight size and delivery distance. Please contact us before purchasing.

Skylights are timber crated for save delivery. We have extensive experience in sending large and fragile skylights.

Please make sure your delivery information is up-to-date as our carrier will need to contact you to book in the delivery.


We use a specialist pallet company for deliveries. Your rooflight will be timber crated to ensure safe transportation. Please provide us with a valid mobile number. Your order will only be delivered to the kerbside, so you must have arrangements in place to get the unit(s) onto your property.


Collection is available from Essex area.

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ELECTRIC OPENING SKYLIGHTS LTD