Flat Roof Skylight 400 x 2000 mm, Fixed, Frameless, Triple Glazed, 45kg, UV 0.9
Original price was: £ 657.00.£ 432.40Current price is: £ 432.40. incl. VAT
Prices go up when the timer hits zero.
15 in stock (can be backordered)
Skylights.co.uk: Trusted rooflights. Built to prevent leaks.
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
Toughened safety & laminated glass
Leakproof Design
Our Flat Roof Skylights are composed of three distinct glass panes, each contributing to the unit’s durability and thermal efficiency:
- Top Pane: 6 mm Planibel Clearlite / Thermally toughened glass, compliant with BS EN 12150
- Middle Pane: 4 mm Planibel Clearlite / Thermally toughened glass, compliant with BS EN 12150
- Bottom Pane: Stratobel Clearlite 44.2 iplus 1.1 / Laminated glass with Low-E coating, compliant with EN 14449
Premium Flat Roof Skylights
Are you thinking of installing a skylight but worried about heat loss? Our Flat Roof Skylight 400 x 2000 mm offers:
- An excellent U-value of 0.9 W/m²K
- Triple-glazed units for optimal insulation
- Warm edge spacer technology
This ensures your space stays warm in winter, cool in summer, and filled with natural light.
Why Choose Our Frameless Flat Roof Windows
- Energy Efficiency: Achieve outstanding thermal performance with triple-glazed units and warm edge spacer technology, providing a U-value of 0.9 W/m²K for year-round comfort and lower energy bills.
- Unobstructed Views: The frameless design maximizes natural light and offers breathtaking panoramic sky views.
- Self-Cleaning Feature: Keep your glass effortlessly clean with a sunlight-activated self-cleaning feature.
- Versatile Installation: It is suitable for flat roofs with pitches between 6° and 45° and fits a variety of home styles.
- Quiet Ambiance: Effective soundproofing ensures a peaceful indoor environment.
- UV Protection: Shields your interior from harmful UV rays.
- Safety First: Constructed with safety-toughened glass for enhanced security.
- Regulation Compliant: Meets all British Standards & Building Regulations and carries the CE safety marking.
Essential Skylight Accessories
Enhance your flat roof skylight with these must-have accessories for seamless roof window installation and peak performance:
- Skylight Blinds for Flat Roof Window 400x2000mm: Custom-fit blinds provide light control and privacy, tailored specifically for your skylight size.
- Installation Kit for 1 x Flat Roof Skylight 400x2000mm: This comprehensive kit ensures optimal performance and durability through secure, hassle-free installation.
- Foam Rope—structural Glazing Tape—9mm Thick (7.5m Rolls): This provides effective sealing and structural support during installation.
- Weatherproofing Sealant (Silicon)—DOWSIL™ 791, 310ml: This product creates a durable, weatherproof seal around your skylight, keeping the elements out.
- Self-Cleaning Liquid Smart Glass Bottle 15ml: This product replenishes the self-cleaning properties of your skylight, ensuring easy maintenance and spotless glass.
Choose Skylights.co.uk
We offer an extensive range of standard sizes, including the popular 2000 x 400 mm skylight (also known as 2 x 0.4 m roof light), as well as fully custom skylights to suit your specific needs. Whether you’re enhancing a residential space or illuminating a commercial property, our flat rooflights deliver exceptional thermal performance, natural light, and elegance. Download our full product catalogue for more details.
Whether you’re seeking to enhance a residential space or illuminate a commercial property, our flat rooflights are designed to deliver exceptional thermal performance, natural light, and a touch of elegance to any setting. Explore our extensive skylight range to find the perfect solution for your project.
Contact us today to discuss your skylight project!
🗺️ Where to Buy 400 x 2000 mm Roof Lights Near Me
Looking for a 400 x 2000 mm roof light near you? Also referred to as a 0.4 x 2 m skylight, this long, narrow format is ideal for walkways, lofts, and side return extensions where vertical daylight is key. We craft frameless flat rooflights designed to deliver light where conventional windows can’t.
✅ Slimline Skylight – Perfect for Side Returns & Hallways
✅ Custom Lengths Available to Fit Your Layout
✅ Thermally Efficient Triple Glazing
✅ Rated 5 Stars on Google
✅ UKCA Certified & Fully Compliant
Precision-engineered and delivered direct from our UK facility, this skylight adds drama, daylight, and design value—without taking over your space.
| Weight | 108 kg |
|---|---|
| Dimensions | 205 × 10 × 145 cm |
| Brand |
Skylights.co.uk |
| Internal Size |
400 x 2000 mm |
| External Size |
600 x 2200 mm |
| Glazing Type | |
| Glass Tint | |
| Self-Cleaning: |
Yes |
| Roof Type |
Flat Roof ,Pitched Roof |
| Skylight Type |
Frameless |
| Top Glass Pane: |
6 mm Planibel Clearlite / Thermally toughened glass EN 12150 |
| Air Gap |
16 mm Argon 90% |
| Middle Glass Pane: |
4 mm Planibel Clearlite / Thermally toughened glass |
| Air Gap |
16 mm Argon 90% |
| Bottom Glass Pane: |
Stratobel Clearlite 44.2 iplus 1.1 pos.5 / Laminated glass with Low-E coating EN 14449 |
| Spacer Type |
15mm Black Warm Edge |
| U value |
0.9 [W/(m².K)] |
| Sound reduction - EN 12758 |
[dB] 39 (-2;-7) |
| Light transmittance: tv [%] |
72 |
| External light refection : ρv [%] |
17 |
| Internal light refection : ρvi [%] |
17 |
| Colour rendering index : Ra [%] |
97 |
| Solar energy transmittance : g [%] |
57 |
| Shading coefcient : SC |
0.66 |
| Selectivity |
1.26 |
| UV transmission : τuv [%] |
0 |
Sold By Manufacturer
15 in stock (can be backordered)
15 in stock (can be backordered)
ACTIVE PROMOTION
Use Code: TODAYONLY
Transform your home with our triple-glazed flat roof skylights, maximizing natural light and thermal efficiency. Pair them with our separately sold Insulated Upstand, featuring 40mm core insulation to cut heat loss and lower energy costs.
Why Choose Our Insulated OSB Upstands?
Perfect Pitch for Water Drainage
Built-In 6° Pitch for perfect drainage
Exceptional Insulation
High Insulation with 40mm core and 15mm OSB
Ready-to-Install, Precision-Cut Fit
Factory-made to match our skylights exactly
Brighten Your Home & Save More – Bundle & Save!
Upgrade with our triple-glazed flat roof skylights for maximum light and energy efficiency.
Add the Insulated Upstand and save up to 7% with our bundle offer!
✔️ Boost thermal performance
✔️ Cut energy costs
✔️ Enjoy lasting durability
Get the complete solution at a better price – bundle today!
Get a Bundle with extra 7% Discount on Skylight and Upstand
Flat Roof Skylight 400 x 2000 mm, Fixed, Frameless, Triple Glazed, 45kg, UV 0.9
Original price was: £ 657.00.£ 402.13Current price is: £ 402.13. incl. VAT
Inclined Insulated Upstand for Flat Roof Skylight 400 x 2000 mm
Original price was: £ 231.20.£ 172.01Current price is: £ 172.01. incl. VAT
Before and After
See how a space is completely transformed with a Skylights.co.uk.
- Maximum daylight
- Modern minimalist design
- Superior insulation & UV protection
One change. Total transformation.
Our Roof Windows in Action
Photos from completed projects by our clients
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.
20 Year Warranty
Enjoy peace of mind with our extensive warranty.
TILE & MEMBRANE COMPATIBLE
FLAT ROOFS
EASY & SECURE INSTALLATION
Will It Fit My Roof?
1. Flat Roofs
Our skylights are suitable for flat roofs with a minimum pitch of 6° when installed with the correct upstand or flashing kit.
2. Tile & Membrane Compatible
Designed for all common UK roof types – from clay tiles and slate to EPDM, GRP, and bitumen flat roof membranes.
3. Easy & Secure Installation
Each skylight is engineered for watertight, airtight installation. Use our installation kits and add our pre-fabricated upstands for a perfect fit and finish.
FAQ
Our triple-glazed models offer U-values as low as 0.9 W/m²K (whole unit), helping you meet Part L regulations and reduce heat loss.
Yes. All our skylights come with self-cleaning glass as standard to reduce dirt buildup.
Yes. We offer made-to-measure rooflights to fit your exact requirements. Contact us for a custom quote.
Yes. When installed with our official flashing kit and according to instructions, it is guaranteed to be watertight.
Absolutely. Each unit uses toughened outer and laminated inner glass that complies with UK safety standards (EN12150 / EN14449).
We offer a 20-year guarantee on the glazing unit.
Jack Jones –
The attic skylight I got from Skylights.co.uk 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.
Sebastian Collins: –
Our staircase area has been beautifully illuminated by a frameless skylight, making every ascent feel special.
Sophia Patel –
Our new skylight has brightened up our kitchen beautifully. Cooking under natural light has never been more enjoyable.
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!
Lily Alexander –
Our staircase skylight has turned a previously unnoticed area into our most welcoming space in the house.
Emma Cooper –
I am very happy with the flat roof windows. The quality is premium and the customer service very attentive.