Flat Roof Skylight 400 x 1500 mm Original price was: £ 515,00.Current price is: £ 404,00. incl. VAT
Back to products
Flat Roof Skylight 400 x 3000 mm Original price was: £ 1.000,00.Current price is: £ 750,00. incl. VAT

Flat Roof Skylight 400 x 2000 mm

Original price was: £ 657,00.Current price is: £ 468,00. incl. VAT

16 People watching this product now!

Regal Glass Group: A trusted manufacturer of premium roof windows

Type: Fixed Frameless Flat Roof Skylight
Internal Size: 400 x 2000 mm
External Size: 600 x 2200 mm
Glazing Type: Triple Glazed
Net Weight: 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 400 x 2000 mm
Original price was: £ 657,00.Current price is: £ 468,00. incl. VAT
Original price was: £ 657,00.Current price is: £ 468,00. incl. VAT
Original price was: £ 715,00.Current price is: £ 615,00. incl. VAT
£ 69,00 incl. VAT
£ 24,00 incl. VAT
£ 15,00 incl. VAT
£ 30,00 incl. VAT

Payment Methods:

Quick Shipping

Get it fast with our expedited shipping options.

Secure Payment

Shop safely with our secure online checkout.

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 Flat Roof Skylight 400 x 2000 mm by Regal Glass Group, an exemplary addition to our range of skylight windows, designed to enhance flat roofs with elegance, efficiency, and heightened security. This model is tailored to infuse your space with abundant daylight while ensuring the utmost safety and thermal performance.

Our skylight is constructed with advanced triple-glazed units, achieving an exceptional U-value of 0.9 W/m²K, indicative of its superior thermal efficiency. This is facilitated by a 15-millimeter warm Edge spacer filled with Argon gas nestled between each glass pane, effectively minimizing heat transfer and maintaining a comfortable interior ambiance all year round.

The standout feature of this skylight is its safety toughened glass, ensuring robust security and durability. This reinforced glass not only withstands harsh weather conditions but also provides added protection against potential break-ins, giving you peace of mind regarding the safety of your space.

The frameless design of the skylight ensures a sleek, modern look that maximizes the entry of natural light, enriching your interior with the sun’s warmth and glow. The absence of a frame allows for a more expansive view of the sky, creating an open, airy feeling in the room below.Equipped with a self-cleaning feature, activated by sunlight, our skylights require minimal maintenance, as they continuously work to remove dirt and blemishes, ensuring a clear, unobstructed view at all times.

Versatile in its installation, the Flat Roof Skylight 400 x 2000 mm is suitable for pitches from 6 degrees to 45 degrees, catering to a broad range of architectural preferences. Beyond its aesthetic appeal, this skylight offers sound reduction, UV protection, and is an excellent insulator, as evidenced by its low U-value.

Fully compliant with British Standards & Building Regulations, this skylight comes with all necessary Safety Markings and is CE marked, affirming 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 2000 mm

External Size

600 x 2200 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 [%]



5 reviews

5 reviews for Flat Roof Skylight 400 x 2000 mm

Clear filters
  1. Jack Jones

    The attic skylight I got from Regal Glass has been a game-changer. The difference in natural light in my loft is astonishing. Their roof windows are definitely the best on the market.

  2. Sebastian Collins:

    Our staircase area has been beautifully illuminated by a frameless skylight, making every ascent feel special.

  3. Sophia Patel

    Our new skylight has brightened up our kitchen beautifully. Cooking under natural light has never been more enjoyable.

  4. George Wilson

    Our new loft skylight has completely transformed our attic. It’s now our favorite room in the house, all thanks to the beautiful natural light!

  5. Lily Alexander

    Our staircase skylight has turned a previously unnoticed area into our most welcoming space in the house.

Add a review

Your email address will not be published. Required fields are marked *

You have to be logged in to be able to add photos to your review.