Flat Roof Skylight 400 x 3000 mm, Fixed, Frameless, Triple Glazed,66kg, UV 0.9
Original price was: £ 1.000.00.£ 698.00Current price is: £ 698.00. incl. VAT
Prices go up when the timer hits zero.
18 in stock (can be backordered)
Skylights.co.uk: Trusted rooflights. Built to prevent leaks.
Type: Fixed Frameless Flat Roof Skylight
Internal Size: 400 x 3000 mm
External Size: 600 x 3200 mm
Glazing Type: Triple Glazed
Net Weight: 66kg
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 considering installing a skylight but worried about heat loss? Our Flat Roof Skylight 400 x 3000 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
- Thermally Efficient: Our triple-glazed units and warm edge spacer technology offer outstanding thermal performance.
- Unobstructed Views: The frameless design maximises natural light penetration and offers breathtaking sky views.
- Self-Cleaning: Effortless maintenance with a sunlight-activated self-cleaning feature keeps the glass spotless.
- Versatile Installation: Suitable for flat roofs with pitches between 6° and 45°.
- Sound Insulation: Provides effective soundproofing for a peaceful indoor environment.
- UV Protection: Offers protection against harmful UV rays.
- Safety First: Constructed with safety-toughened glass for ultimate peace of mind.
- 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 skylight installation and peak performance:
- Skylight Blinds for Flat Roof Window 400x3000mm: Custom-fit blinds provide light control and privacy, tailored specifically for your skylight size.
- Installation Kit for 1 x Flat Roof Skylight 400x3000mm: 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 3000 x 400 mm skylight (also known as 3 x 0.4 m roof light), as well as fully custom skylights tailored to your specific requirements. Our flat roof lights provide:
- Exceptional Thermal Performance: Triple glazing ensures superior insulation and year-round comfort.
- Natural Light Abundance: Floods your space with beautiful natural light, creating a bright and inviting atmosphere.
- Elegant Design: Sleek, modern designs that add a touch of sophistication to any setting.
Download our full product catalogue to explore our extensive range of flat roof skylights and find the perfect solution for your project. Ready to discuss your skylight needs? Contact us today!
🗺️ Where to Buy 400 x 3000 mm Flat Roof Skylights Near Me
Searching for a 400 x 3000 mm roof light near you? Also known as a 0.4 x 3 m skylight, this ultra-slim but extra-long format is made for modern extensions, skylight corridors, and bold linear designs. We supply frameless roof lights that turn ceilings into showpieces.
✅ Architectural Format – Long, Lean, and Light-Filled
✅ Built to Order with Manufacturer Pricing
✅ Installer Advice Available – We’re Here to Help
✅ 20-Year Warranty – Performance Guaranteed
✅ Fast UK Delivery with Trade Support Options
Engineered to perform under UK conditions, our skylights meet strict standards and arrive ready to install—on time and on spec.
| Weight | 108 kg |
|---|---|
| Dimensions | 205 × 10 × 145 cm |
| Brand |
Skylights.co.uk |
| Internal Size |
400 x 3000 mm |
| External Size |
600 x 3200 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
18 in stock (can be backordered)
19 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 3000 mm, Fixed, Frameless, Triple Glazed,66kg, UV 0.9
Original price was: £ 1.000.00.£ 649.14Current price is: £ 649.14. incl. VAT
Inclined Insulated Upstand for Flat Roof Skylight 400 x 3000 mm
Original price was: £ 304.00.£ 226.18Current price is: £ 226.18. 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.
Daniel Evans –
I am very pleased with the flat roof skylights. The quality is superior and the delivery was very fast. Highly recommended.
Grace Thomas –
The flat roof windows are of exceptional quality. The customer service is very responsive and the delivery was fast.
James Roberts –
The flat roof windows have greatly improved the lighting in our house. Very satisfied with my purchase.
Jessica Parker –
The flat roof windows are of exceptional quality. The customer service is very responsive and the delivery was fast.”
Charlie Wood –
The flat roof windows have greatly improved the lighting in our house. Very satisfied with my purchase.
Maeve Murphy –
Our frameless roof window is exactly what we wanted. It’s sleek, modern, and has brought so much light into our living room.
Ava Foster –
Our kitchen looks completely different now. The skylight lets in so much natural light, and the support team was there every step of the way. Quick delivery too!
Samuel Howard –
Great service and an excellent product. The skylight arrived quicker than we expected, and it has made a huge difference to the amount of light in our home.
Rebecca Coleman –
Amazing support team and fast dispatch. Would buy again!
Hannah Fox –
From order to delivery, the process was smooth and professional.
Emily Foster –
Installation was straightforward thanks to the technical assistance.