Flat Roof Skylight 600 x 2500 mm Original price was: £ 867,00.Current price is: £ 663,00. incl. VAT
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Flat Roof Skylight 1200 x 1800 mm

Original price was: £ 988,00.Current price is: £ 798,00. incl. VAT

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Regal Glass Group: A trusted manufacturer of premium roof windows

Type: Fixed Frameless Flat Roof Skylight
Internal Size: 1200 x 1800 mm
External Size: 1400 x 2000 mm
Glazing Type: Triple Glazed
Net Weight: 106.80kg
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 1200 x 1800 mm
Original price was: £ 988,00.Current price is: £ 798,00. incl. VAT
Original price was: £ 988,00.Current price is: £ 798,00. incl. VAT
Original price was: £ 762,00.Current price is: £ 662,00. incl. VAT
£ 69,00 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.

Introducing the Flat Roof Skylight 1200 x 1800 mm by Regal Glass Group, a synthesis of our over two decades of expertise in skylights and flat roof windows with cutting-edge technology. This larger skylight window transforms flat roofs into sources of abundant natural light while offering the added advantage of a self-cleaning feature, making maintenance a worry of the past.

Each of our Flat Roof Skylights is produced with meticulous care in our own facilities, ensuring the use of only premium quality materials. The 1200 x 1800 mm model features a modern, frameless design that not only complements your architectural aesthetic but also enhances the natural light within your space. The triple-glazed units achieve a U-value of 0.9 W/m²K, providing exceptional thermal efficiency and contributing to a stable and comfortable interior climate.

The innovative self-cleaning glass, activated by natural sunlight, breaks down and washes away dirt and debris, keeping your skylight clear and maintenance to a minimum. This feature, coupled with the durability of safety toughened glass, reflects our commitment to providing products that are both functional and long-lasting.

At Regal Glass Group, we offer an extensive selection of standard sizes to accommodate a variety of needs. For those seeking a more tailored solution, our custom skylights are designed to meet your unique specifications, ensuring a seamless integration with your home’s design. The Flat Roof Skylight 1200 x 1800 mm, with its emphasis on self-cleaning technology, premium materials, and energy efficiency, is the perfect addition to any home, combining practicality with the timeless beauty of natural light.


108 kg


205 × 10 × 145 cm


Regal Glass


Regal Glass Group Ltd

Internal Size

1200 x 1800 mm

External Size

1400 x 2000 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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