Flat Roof Skylight 800 x 2500 mm, Fixed, Frameless, Triple Glazed, 100.50kg, UV 0.9
Original price was: £ 954.00.£ 688.00Current price is: £ 688.00. incl. VAT
Prices go up when the timer hits zero.
14 in stock (can be backordered)
Skylights.co.uk: Trusted rooflights. Built to prevent leaks.
Type: Fixed Frameless Flat Roof Skylight
Internal Size: 800 x 2500 mm
External Size: 1000 x 2700 mm
Glazing Type: Triple Glazed
Net Weight: 100.50kg
U Value: 0.9 W/m²K
G Value: 58%
Light transmittance : τv [%] 72
Sound reduction (EN 12758): 39dB
UV transmission : τuv [%] 0
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
Considering adding a skylight but worried about heat loss? Our Flat Roof Skylight 800 x 2500 mm provides a remarkable U-value of 0.9 W/m²K, due to its triple-glazed units and warm edge spacer technology. This ensures excellent insulation, keeping your space warm in winter and cool in summer while flooding your room with natural light.
Why Choose Our Frameless Flat Roof Windows
- Energy Efficiency: Benefit from the exceptional flat roof with skylight thermal performance with triple-glazed units and warm edge spacer technology, achieving a U-value of 0.9 W/m²K for consistent comfort and lower energy bills.
- Unobstructed Views: The frameless design maximizes natural light and offers stunning panoramic sky views.
- Self-Cleaning Feature: Keep your glass effortlessly clean with a self-cleaning feature activated by sunlight.
- Versatile Installation: Suitable for flat roofs with pitches from 6° to 45°, fitting various home styles.
- Peaceful Ambiance: Effective soundproofing ensures a quieter indoor space.
- UV Protection: Protects against harmful UV rays.
- Safety First: Made with safety-toughened glass for enhanced security.
- Regulation Compliant: Meets British Standards & Building Regulations and carries the CE safety marking.
Essential Skylight Accessories
Enhance your skylight for flat roof experience with these essential accessories for smooth roof window installation and peak performance:
- Skylight Blinds for Flat Roof Window 800x2500mm: Custom-fit blinds provide light control and privacy, tailored to your skylight size.
- Installation Kit for 1 x Flat Roof Skylight 800x2500mm: Comprehensive kit 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: Restores 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 2500 x 800 mm skylight (also known as 2.5 x 0.8 m roof light), as well as fully custom skylights tailored to your specific requirements. Our flat rooflights deliver exceptional thermal performance with innovative features like triple glazing, ensuring your space remains comfortable throughout the year. They also allow an abundance of natural light to enhance your room, creating a bright and inviting atmosphere. With sleek, modern designs, our flat rooflights add a touch of sophistication to any setting.
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 800 x 2500 mm Skylights Near Me
Looking for a 800 x 2500 mm roof light near you? Also known as a 0.8 x 2.5 m skylight, this size is perfect for long, narrow spaces—like kitchen extensions or side-return corridors. We produce frameless roof lights that add architectural elegance and day-long brightness.
✅ Elongated Format – Ideal for Linear Design Layouts
✅ Custom Sizes & Configurations Built In-House
✅ Next-Day UK Delivery on Select Models
✅ 20-Year Manufacturer Warranty
✅ Rated 5 Stars on Google
We ship nationwide, providing high-quality, UKCA-certified flat rooflights that balance beauty, build quality, and modern energy performance.
| Weight | 81 kg |
|---|---|
| Dimensions | 225 × 10 × 105 cm |
| Internal Size |
800 x 2500 mm |
| External Size |
1000 x 2700 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
14 in stock (can be backordered)
17 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 800 x 2500 mm, Fixed, Frameless, Triple Glazed, 100.50kg, UV 0.9
Original price was: £ 954.00.£ 639.84Current price is: £ 639.84. incl. VAT
Inclined Insulated Upstand for Flat Roof Skylight 800 x 2500 mm
Original price was: £ 420.00.£ 286.04Current price is: £ 286.04. 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.
James King –
Installing an 800 x 2500 mm skylight in our kitchen has been a game-changer. Regal Glass Group really delivered on quality and design, making our cooking space brighter and more inviting.
Sophie Morgan –
The 800 x 2500 mm skylight in our hallway has brightened up the entire house. Regal Glass Group offers fantastic products and service.
Ella Winslow –
We noticed a big improvement in natural light. Great product!
Orla McGlinchey –
Here in Bristol, our flat roof skylight has totally transformed our living space. The quality is excellent, and it brings in tons of natural light.
Sebastian Montague –
This skylight is both practical and elegant.
Sophia Radcliffe –
Amazing clarity and high-quality glass. The best decision we made.
Daisy Langford –
A modern and energy-efficient addition to our home.