Flat Roof Window - 400 x 2000mm
TRIPLE GLAZED SKYLIGHT 400 x 2000 mm Original price was: £657.00.Current price is: £467.54. incl. VAT
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Triple Glazed Flat Roof Window - 500 x 1500mm
TRIPLE GLAZED SKYLIGHT 500 x 1500 mm Original price was: £587.00.Current price is: £432.62. incl. VAT


(10 customer reviews)

Original price was: £1,000.55.Current price is: £749.81. incl. VAT

Prices go up when the timer hits zero.


* Glazing Type: Triple Glazed
* Internal glass size: 400 x 3000 mm
* U Value: 0.9 W/m²K
* G Value: 58%
* Noise-proofing value: 39 dB
* Free delivery within London (M25)
* Nationwide Delivery
* 20-Year Warranty

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29 in stock

Skylights1 Pitched Roof Skylight Blinds -400 x 3000mm
Original price was: £690.00.Current price is: £640.20. incl. VAT
Original price was: £83.74.Current price is: £82.91. incl. VAT
Original price was: £19.38.Current price is: £19.19. incl. VAT
Original price was: £16.09.Current price is: £15.93. incl. VAT
Original price was: £19.90.Current price is: £19.30. incl. VAT
Weight 66 kg
Dimensions 325 × 10 × 85 cm



Saris-UK Ltd






Triple Glazed Skylight / Rooflight 400 x 3000 mm

This high-performance, non-opening frameless skylight is triple glazed with 6mm toughened, self-cleaning glass and a U Value of only 0.9 W/m²K.
The internal quoted glass size is 400 x 3000 mm, see the structural diagram below.

Our Flat Roof Skylights are composed of three distinct layers, each contributing to the unit’s durability and thermal efficiency:

Top Layer: 6mm BS EN 12150 Thermally Toughened Glass

Middle Layer: 4mm BS EN 12150 Thermally Toughened Glass

Bottom Layer: 44.2 Low E;  BS EN 14449 Laminated Glass

  • Glazing Type: Triple Glazed
  • Internal Glass Size (QUOTED): 400 x 3000 mm
  • External Glass Size: 600 x 3200 mm
  • Top Glass Pane: 6mm BS EN 12150 Thermally Toughened Glass
  • Spacer Type: 15mm Black Warm Edge
  • Air Gap: 15mm 90% Argon Filled
  • Middle Glass Pane: 4mm BS EN 12150 Thermally Toughened Glass
  • Spacer Type: 15mm Black Warm Edge
  • Air Gap: 15mm 90% Argon Filled
  • Bottom Glass Pane: 44.2 Low E;  BS EN 14449 Laminated Glass
  • U Value: 0.9 W/m²K
  • G Value: 58%
  • Net Weight: 66kg
  • Self-Cleaning: YES
  • UV Protected: YES
  • Clear Tint

Safety and Compliance: Choosing the Right Skylight

When it comes to choosing a roof light for your home, we know that safety is an important deciding factor.

This product conforms to British Standards & Building Regulations and has all Safety Markings.

It is CE marked which is a certification mark that indicates conformity with the relevant EU directives and standards for products sold within Europe.

Our Skylights can be installed at a maximum pitch of 45 degrees.

Installation Specifications and Recommendations:

  • Internal Dimensions: It's important to note that the top pane of glass includes a black border, extending the external dimensions of the unit by 200 millimetres in each direction.
  • Creating the Opening: When preparing for installation, allow an additional 10 millimetres internally from upstand to upstand for proper fitting. For example, for a 600 by 900 unit, the opening should be 610 by 910 millimetres internally.
  • Upstand Construction: We recommend constructing the upstand (the wooden framework housing the skylight) using two-by-one or two-by-two-inch timbers.
  • Foam Rope and Sealant Use: For optimal installation, install foam rope on top of the internal supporting baton, which helps level out weight discrepancies and stress on the glass. We advise using Dowsil 791 black-coloured sealant to create a watertight perimeter around your upstand. Please note that acrylic sealants are not compatible with our units and should not be used.

Find Your Perfect Fit with Our Custom Size Skylight Calculators

Choose our skylights for a superior, clear, and comfortable living environment.

At Saris-Extensions, our Flat Roof Skylights are more than just an architectural feature; they are a fusion of advanced technology, energy efficiency, and sleek design.

Best Price
20 Years Warranty
Guarantee Payment Safety
Self Cleaning
Clear Tint
UV Protected
Free Delivery within London (M25)
Аll Glass Panels
Safety Toughened and Laminated Glass
Made In EU
London Based Stock
Quick and easy installation
Step By Step installation guide
24/7 technical helpline


10 reviews

10 reviews for TRIPLE GLAZED SKYLIGHT 400 x 3000 mm

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  1. Paul Clark

    Sleek Design, Seamless Installation: Saris Extension! Recommend company!

  2. Ethan Robson

    Lily from Saris Extension was more than just a customer service rep. She was my guide, advisor and friend through my skylight journey. Her expertise and kindness made all the difference.

  3. Sasha Grey

    Saris Extension brought a beacon of light into our London home. The bespoke roof window they installed has dramatically improved our living space. We wholeheartedly recommend Saris Extension to anyone looking for quality skylights.

  4. Amelia Johnson

    I’ve always dreamed of a bright, airy home, and thanks to our roof window, my dream has come true. The natural light that streams into our living space is breathtaking.

  5. Alan Smith

    I’m incredibly happy with my flat roof triple glazed skylight from Saris Extension. Not only is it well-insulated, but the extra sunlight it allows into my home has been a mood-lifter.

  6. Nina Collins

    The triple glazed skylight 400 X 3000 for my flat roof from Saris Extension is outstanding. It’s really helped to keep my home well insulated, and the amount of natural light it lets in is just delightful.

  7. Emily Clark

    I can’t recommend Saris Extension’s flat roof triple glazed skylights enough. They’ve totally transformed my living space with beautiful natural light and help maintain a comfortable temperature year-round.

  8. Dann Eggburds

    Excellent product and service! The skylights were delivered quickly and the quality is superb. The variety of sizes allowed us to choose the perfect one for our home office. The difference in our space is remarkable—more light and a better atmosphere.

  9. Liam Dwayne

    Top-quality skylights with fantastic service to match. The wide range of sizes meant we could find exactly what we needed for our home office. Delivery was fast, and the customer support was exceptional. The skylights have really brightened up our space and made it much more pleasant to work in.

  10. James Gun

    I recently purchased skylights from this company, and I am beyond impressed. The quality is outstanding, and the delivery was lightning-fast. Customer support was incredibly helpful and answered all my queries promptly. With a wide range of sizes, I found the perfect fit for my home. The skylights have completely transformed my living room, making it bright and airy. Highly recommend!

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