Flat Roof Skylight 1200 x 1800 mm, Fixed, Frameless, Triple Glazed, 106.80kg, UV 0.9
Original price was: £ 988.00.£ 733.20Current price is: £ 733.20. incl. VAT
Prices go up when the timer hits zero.
12 in stock (can be backordered)
Skylights.co.uk: Trusted rooflights. Built to prevent leaks.
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
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
Thinking about adding a flat roof windows skylights but worried about heat loss? Our Flat Roof Skylight 1200 x 1800 mm features an impressive U-value of 0.9 W/m²K, thanks to its triple-glazed units and warm edge spacer technology. This provides superior insulation, keeping your space warm in winter and cool in summer, while allowing in abundant natural light.
Why Choose Our Frameless Flat Roof Windows
- Energy Efficiency: Experience outstanding thermal performance with our triple-glazed units and warm edge spacer technology, resulting in a U-value of 0.9 W/m²K for year-round comfort and reduced energy expenses.
- Unobstructed Views: The frameless design maximizes natural light penetration and offers breathtaking panoramic views of the sky.
- Self-Cleaning Feature: Enjoy easy maintenance with a sunlight-activated self-cleaning feature that keeps your glass sparkling clean.
- Versatile Installation: Ideal for flat roofs with pitches between 6° and 45°, making it suitable for various home styles.
- Quiet Ambiance: Effective soundproofing ensures a peaceful indoor environment.
- UV Protection: Safeguards your interior from harmful UV rays.
- Safety First: Built with safety-toughened glass for enhanced security.
- Regulation Compliant: Fully compliant with British Standards & Building Regulations and carries the CE safety marking.
Essential Skylight Accessories
Enhance your flat roof skylight experience with these must-have accessories for smooth installation and optimal performance:
- Skylight Blinds for Flat Roof Window 1200x1800mm: Custom-fit blinds provide light control and privacy, perfectly tailored to your skylight size.
- Installation Kit for 1 x Flat Roof Skylight 1200x1800mm: A comprehensive kit that ensures secure and hassle-free installation for optimal performance and durability.
- Foam Rope – Structural Glazing Tape – 9mm Thick (7.5m Rolls): Offers effective sealing and structural support during installation.
- Weatherproofing Sealant (Silicon) – DOWSIL™ 791, 310ml: Creates a durable, weatherproof seal around your skylight, keeping the elements out.
- Self-Cleaning Liquid Smart Glass Bottle 15ml: 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 1800 x 1200 mm skylight (also known as 1.8 x 1.2 m roof light), as well as fully custom skylights tailored to your specific needs. No matter the project, our flat rooflights provide exceptional thermal performance with innovative features like triple glazing, ensuring your space remains comfortable year-round. They also flood your space with beautiful natural light, creating a brighter and more inviting atmosphere. Enhance any setting with the sleek, modern design of our flat rooflights.
Download our full product catalogue to explore our extensive Flat Roof skylight range and find the perfect solution for your project. Ready to discuss your skylight needs? Contact us today!
🗺️ Where to Buy 1200 x 1800 mm Roof Lights Near Me
Searching for a 1200 x 1800 mm roof light near you? Also referred to as a 1.2 x 1.8 m rooflight, this size is a brilliant match for larger interior zones like open-plan lounges, rear extensions, or creative studios. We specialise in frameless rooflights that bring more daylight, better efficiency, and a polished finish to every space.
✅ Balanced Light Distribution for Spacious Rooms
✅ Trusted by UK Architects, Designers & Builders
✅ Certified to UKCA Standards – Fully Compliant
✅ Frameless Glazing – Pure Sky View with No Distractions
✅ Installer-Friendly Design with Expert Support Available
Our rooflights are made in-house with technical precision, finished for visual harmony, and delivered quickly across the UK—ready to install and impress.
| Weight | 108 kg |
|---|---|
| Dimensions | 205 × 10 × 145 cm |
| Internal Size |
1200 x 1800 mm |
| External Size |
1400 x 2000 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
12 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 1200 x 1800 mm, Fixed, Frameless, Triple Glazed, 106.80kg, UV 0.9
Original price was: £ 988.00.£ 681.88Current price is: £ 681.88. incl. VAT
Inclined Insulated Upstand for Flat Roof Skylight 1200 x 1800 mm
Original price was: £ 609.00.£ 450.59Current price is: £ 450.59. 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.
Henry Lewis –
The flat roof windows have transformed our interior. The quality is incredible and the delivery was quick.
Samuel Allen –
The quality of the flat roof skylights is incredible. The customer service is very friendly and professional.
Chloe Wright –
The flat roof windows have given new life to our house. The delivery was quick and the customer service was excellent.
Sinead McCrory –
Our flat roof skylight in Leeds has given our home such a modern look. The natural light it lets in has completely transformed our kitchen.