Flat Roof Skylight 400 x 2000 mm Original price was: £ 657,00.Current price is: £ 468,00. incl. VAT
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Flat Roof Skylight 500 x 1500 mm Original price was: £ 587,00.Current price is: £ 433,00. incl. VAT

Flat Roof Skylight 400 x 3000 mm

Original price was: £ 1.000,00.Current price is: £ 750,00. incl. VAT

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Regal Glass Group: A trusted manufacturer of premium roof windows

Type: Fixed Frameless Flat Roof Skylight
Internal Size: 400 x 3000 mm
External Size: 600 x 3200 mm
Glazing Type: Triple Glazed
Net Weight: 66kg
U Value: 0.9 W/m²K
G Value: 58%
Light transmittance : τv [%] 72
Sound reduction (EN 12758): 39dB
UV transmission : τuv [%] 0

Experience the excellence of Regal Glass Group’s roof windows, featuring these impressive technical characteristics.

This item: Flat Roof Skylight 400 x 3000 mm
Original price was: £ 1.000,00.Current price is: £ 750,00. incl. VAT
Original price was: £ 1.000,00.Current price is: £ 750,00. incl. VAT
Original price was: £ 766,00.Current price is: £ 666,00. incl. VAT
£ 84,00 incl. VAT
£ 24,00 incl. VAT
£ 15,00 incl. VAT
£ 30,00 incl. VAT

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Easy Returns

Hassle-free returns within 30 days.

10 Year Warranty

Enjoy peace of mind with our extensive warranty.

Frameless Skylights Glass Performance

Experience the perfect blend of natural light, energy efficiency, noise reduction, and UV protection with our precision-engineered glass.

Modern Design
Solar energy transmittance (G value): g [%] 65
UV transmission : 0 τuv [%]
Light transmittance: τv [%] 72
Thermal transmittance (U value): : 0.9 [W/(m².K)]
Min 3.0 [W/(m².K)] / Max 0.1 [W/(m².K)] 70%
Shading coefficient: 0.66 SC
( Maximum SC 1.00 / Maximum SC 0.20 ) 42%
Sound Reduction: 39 dB (-2;-7)
( Maximum 40dB / Minimum 30dB ) 90%

Easy to replicate
Installation Guide

Dive into our user-friendly Installation Guide for a smooth skylight setup. Get the clarity you need, step-by-step.

Click below to explore the full guide.

Presenting the expansive Flat Roof Skylight 400 x 3000 mm by Regal Glass Group, an epitome of modern skylight solutions designed for those who cherish natural light and wish to protect their interiors from harmful UV rays. This grand skylight window is tailor-made to enhance the ambiance of any flat-roofed space by inviting an abundance of daylight while ensuring the utmost UV protection.

Featuring state-of-the-art triple-glazed units, this skylight boasts exceptional thermal efficiency with a U-value of 0.9 W/m²K, ensuring your indoor environment remains comfortable throughout the year. The inclusion of a 15-millimeter warm Edge spacer, filled with Argon gas between the glass panes, plays a crucial role in minimizing heat transfer.

One of the standout features of this skylight is its UV protection capability. The specialized glass used in our skylights filters out harmful UV rays, safeguarding your furnishings and interior decorations from fading and damage caused by prolonged sun exposure. This ensures that the beauty and integrity of your indoor space are preserved over time. The frameless design of our skylight not only adds to the aesthetic appeal of your property but also maximizes the entry of natural light, creating a brighter, more inviting atmosphere in your living or working area. Additionally, the self-cleaning feature, activated by sunlight, ensures that maintenance is hassle-free, keeping your view clear and unobstructed.

Designed for versatility, the Flat Roof Skylight 400 x 3000 mm can be installed at pitches from 6 degrees up to 45 degrees, making it a perfect fit for a wide range of architectural styles. Beyond its visual and functional benefits, this skylight also offers significant sound reduction and is constructed with safety toughened glass, enhancing the security and durability of the installation.

Compliant with British Standards & Building Regulations, this skylight comes with all necessary Safety Markings and is CE marked, indicating its adherence to EU quality and safety standards.

At Regal Glass Group, we understand the importance of choice and customization. That’s why, in addition to our range of standard size skylights that are readily available in stock, we proudly offer custom skylight solutions tailored to your unique requirements. Whether you’re enhancing a residential space or illuminating a commercial venue, our skylights are designed to bring light, elegance, and efficiency to any setting.


108 kg


205 × 10 × 145 cm


Regal Glass


Regal Glass Group Ltd

Internal Size

400 x 3000 mm

External Size

600 x 3200 mm

Glazing Type

Triple glazed

Glass Tint

Clear Tint



Roof Type

Flat Roof , Pitched Roof

Skylight Type


Top Glass Pane:

6 mm Planibel Clearlite / Thermally toughened

Air Gap

16 mm Argon 90%

Middle Glass Pane:

4 mm Planibel Clearlite Thermally toughened

Air Gap

16 mm Argon 90%

Bottom Glass Pane:

Stratobel Clearlite 44.2 with iplus 1.1 pos.5

Spacer Type

15mm Black Warm Edge

U value

0.9 [W/(m².K)]

Sound reduction - EN 12758

[dB] 39 (-2;-7)

Light transmittance: tv [%]


External light refection : ρv [%]


Internal light refection : ρvi [%]


Colour rendering index : Ra [%]


Solar energy transmittance : g [%]


Shading coefcient : SC




UV transmission : τuv [%]



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