Flat Roof Skylight 300 x 300 mm

£ 120,00 incl. VAT

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Regal Glass Group: A trusted manufacturer of premium roof windows

Type: Fixed Frameless Flat Roof Skylight
Internal Size: 300 x 300 mm
External Size: 500 x 500 mm
Glazing Type: Triple Glazed
Net Weight: 6.45kg
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 300 x 300 mm
£ 120,00 incl. VAT
£ 120,00 incl. VAT
£ 39,00 incl. VAT
£ 24,00 incl. VAT
£ 15,00 incl. VAT
£ 30,00 incl. VAT

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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.


Introducing the Flat Roof Skylight 300 x 300 mm from Regal Glass Group, a pinnacle of innovation in skylights and flat roof windows. This compact yet powerful skylight window is designed to enhance your living or working space with natural light, superior thermal efficiency, and unparalleled elegance.

Crafted with triple-glazed units, this skylight boasts an impressive U-value of 0.9 W/m²K, ensuring better thermal efficiency and maintaining an ambient temperature indoors throughout the year. The secret lies in the 15-millimeter warm Edge spacer nestled between each pane of glass, filled with Argon gas to minimize heat transfer.

Our frameless units not only offer sleek, modern aesthetics but are also remarkable insulators, as evidenced by their low U-value. The lower the U-value, the better the insulation, making these skylights an excellent choice for energy-conscious homeowners and businesses alike.But that’s not all – these skylights come equipped with a self-cleaning feature. Activated by sunlight, the built-in chemicals work tirelessly to eliminate marks and blemishes, ensuring a pristine view without the hassle of frequent cleaning.

Designed for versatility, these skylights can be installed at a minimum pitch of 6 degrees, extending up to a maximum of 45 degrees, catering to a wide range of architectural needs. They offer significant sound reduction, UV protection, and are made with safety toughened glass for peace of mind. Adhering to the highest standards, the Flat Roof Skylight 300 x 300 mm meets all British Standards & Building Regulations, boasts all necessary Safety Markings, and is CE marked, signifying its compliance with EU directives and 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.


6 , 45 kg


55 × 10 × 55 cm


Regal Glass


Regal Glass Group Ltd

Internal Size

300 x 300 mm

External Size

500 x 500 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 [%]



4 reviews

4 reviews for Flat Roof Skylight 300 x 300 mm

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  1. Harry William

    I bought a small attic skylight and it has transformed my space. The natural light it brings in has turned a previously unused space into my favorite spot in the house. Huge thanks to Regal Glass for the fast shipping to Manchester and the great service!

  2. Qwewqw


  3. Olivia Scott

    The small skylight in our bathroom has made a huge difference. Regal Glass Group’s products are top-notch.

  4. Ella Jackson

    Installed a small skylight in our bathroom. It’s very good and adds nice light.

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