Description
Flat Rooflight Sizes and Specifications
Lid Only Rooflight
Lid only units are designed to be fixed onto a builder’s upstand on flat or pitched roofs.
Efficient
Each unit is manufactured from powder-coated aluminium with an integrated thermal break for enhanced insulation and reduced heat loss.
Guide to Flat Rooflight Sizes
Choosing the right size for your flat rooflight or skylight window is crucial for maximising natural light, ensuring energy efficiency, and meeting structural requirements.
Our premium flat roof lights, designed for both flat and pitched roofs with an upstand, offer versatile sizing options to suit diverse residential and commercial projects.
How to measure your roof light
Flat rooflights and skylights are available in a range of standard sizes to fit most projects, with dimensions typically measured by the External Upstand.
Double Glazed Rooflights
- 1000×1000 mm
- 1200×1000 mm
- 1500×1000 mm
- 1800×1000 mm
- 2000×1000 mm
- 2200×1000 mm
- 2500×1000 mm
- 3000×1000 mm
Triple Glazed Rooflights
- 1000×1000 mm
- 1200×1000 mm
- 1500×1000 mm
- 1800×1000 mm
- 2000×1000 mm
- 2200×1000 mm
- 2500×1000 mm
- 3000×1000 mm
Circular Rooflights
- 1000mm diameter
- 1200mm diameter
- 1500mm diameter
- 1800mm diameter
- 2000mm diameter
- 2400mm diameter
Double Glazed Rooflights Specification
Our cost-effective double glazed rooflights combine toughened safety glass with a low-E coating for excellent thermal performance. The typical build includes:
- Outer Pane: 6 mm clear heat-soak tested toughened glass, reducing the risk of spontaneous breakage by 95% compared to standard glass.
- Cavity: 20 mm argon-filled cavity for enhanced insulation.
- Inner Pane:
- Option 1: 6 mm soft coat low-E heat-soak tested toughened glass.
- Option 2: 8.8 mm soft coat laminated glass for added overhead protection.
Note: While toughened glass is classified as safety glass, it may fragment in the rare event of breakage. For enhanced safety, opt for the laminated double glazed upgrade, which prevents glass fragments from falling through, ideal for overhead installations.
Pre-Determined Glass Load and Rooflight Load Design
Our rooflights are rigorously tested to withstand typical UK environmental conditions, ensuring reliability and performance. Key load ratings include:
- Standard Rooflights:
- Wind Load: 1.0 kN/m², designed to resist strong winds across the UK.
- Snow Load: 0.9 kN/m², capable of supporting moderate to heavy snow accumulation.
- Walk-On Rooflights:
- Uniform Distributed Load (UDL): 1.5 kN/m², ideal for areas with foot traffic or maintenance access.
- Concentrated Load: 2.0 kN, ensuring structural integrity under localized pressure.
For projects requiring higher or site-specific load performance, we offer custom-designed rooflights tailored to your structural needs. Contact us to discuss bespoke solutions for unique wind, snow, or load requirements.
Why Choose Our Flat Roof Lights?
At Overhead Glazing, we design, supply and install flat roof skylights to brighten UK homes and commercial spaces. Our rooflights are made with premium components, including powder coated aluminium frames with thermal breaks and heat-soaked toughened glass for safety and durability.
Versatile Installation for Any Roof Type
Our flat roof lights are engineered for seamless integration with both flat and pitched roofs featuring an upstand. This versatility ensures compatibility with a wide range of architectural designs, making them perfect for modern homes, extensions, or commercial buildings.
Exceptional Thermal Efficiency
Maximise energy savings with our thermally efficient flat roof lights. Featuring integrated thermal breaks and low-E glass, our rooflights deliver outstanding insulation with Ug-values as low as 0.9W/m². This reduces heat loss, lowers energy bills, and ensures year-round comfort.
Uncompromising Safety Standards
Safety is paramount. Our flat roof lights come with laminated inner panes as standard, providing robust overhead protection. This ensures peace of mind, whether installed in residential or commercial spaces.
Long-Lasting Durability with 10-Year Seal Warranty
Our pre-bonded rooflight units are built to last, backed by a 10-year seal warranty. This guarantees a watertight, durable solution that withstands the test of time, offering exceptional value for your investment.
Heat-Soaked Tested Glass for Enhanced Reliability
Our rooflights feature heat-soaked tested glass, reducing the risk of spontaneous glass breakage by an impressive 95% compared to cheaper alternatives. This advanced technology ensures unmatched reliability and safety.
Designed for UK Weather Conditions
Designed to withstand the toughest UK weather, our flat roof lights are built to handle wind loads of 1.0 kN/m² and snow loads of 0.9 kN/m². For unique requirements, we offer custom load designs to ensure performance in any region.
Wall-Abutted Rooflights for Extensions
Designed for flat roof extensions, lean-to roofs, or side returns, our wall-abutted rooflights offer seamless integration with adjacent walls. Built with the same high-quality materials as our standard rooflights, they ensure clean lines, thermal efficiency, and durability.
Check out our wall abutted Rooflights
Frequently asked questions
Do you offer a site survey before installation?
Double glazed rooflights offer cost-effective insulation, while triple glazed rooflights provide superior energy efficiency with three layers of glass, ideal for eco-conscious homes in the UK.
How long does rooflight installation take?
Most installations are completed within 1-2 days, depending on project complexity. Our team provides a detailed timeline during your site survey.
Are your rooflights safe for overhead use?
Yes, our laminated double glazed and triple glazed rooflights feature safety glass to prevent fragments from falling, ensuring reliable overhead protection.
Can you install rooflights outside of London?
We offer installation services across the UK, including London, Manchester, Nottingham, Bristol and beyond. Contact us to confirm availability in your area.
Get In Touch
Speak to our technical team on 0208 150 7950, email us at sales@overheadglazing.co.uk or request a quote by filling out the form below.
Testimonials
“Excellent professional service from Nader over 12 months of our project design planning and installation. We are delighted with the end result, and seamless design of our roof glazing. Great Job…👍🏼”
Edward BandyBespoke Modular Rooflight
“We were fortunate to find Overhead Glazing online and what attracted us was the modern and sleek design of the ridge lights. We are so happy with the finished product and it looks great on our barn conversion, complementing the old with the new. ”
Ross HowesRidge Rooflight
“Very nice team and great rooflights. Really helpful and made the whole process easy. Highly recommended. Thank you. Paddy”
Paddy SuttonRooflight Replacement
Flat Rooflights - Made to order
Custom Sizing for Unique Projects
For non-standard roofs or bespoke designs, custom rooflights are available to meet specific architectural needs:
- Bespoke Dimensions: Our flat rooflights can be tailored up to 7m² in a single pane or designed as modular setups, ensuring flexibility for unique spaces like repurposed buildings or large extensions.
- Specialty Shapes: Beyond standard rectangular or square units, circular rooflights (up to 2400mm diameter) or multi-sectional designs with supporting beams are available for distinctive aesthetics
- Replacement Skylights: Custom sizes are ideal for replacing older skylights in listed buildings or non-standard structures, ensuring compliance with modern insulation standards.
Request a Custom Quote to find the perfect glazing solution.
Bespoke Flat Rooflight
Fixed Standard Rooflights
For those who seek quality rooflights at great prices. Lid only Fixed Rooflight available in double glazed and laminated glass.
Walk-on Rooflights
These work as a stunning feature providing access to rooftop areas, blurring the boundaries between interior and exterior spaces.
Modular Rooflights
Custom specified and flexible solution overcomes the practical challenges of transporting and installing large, single-piece rooflights.
Eaves Rooflights
The ideal solution for assembling a rooflight around internal or external angles in adjacent walls or chimney stacks.
Circular Rooflights
These are specially designed Rooflights that are made circular. It provides facility in design and aesthetics. The sweeping curves are used to create a modern look.
Ridge Rooflights
The Ridge Rooflight is a custom rooflight, glazed on both returns and precision built to straddle the ridge of your roof, matching its angle of pitch precisely.
Circular Rooflights: A Modern Statement
Our bespoke circular rooflights create a stunning focal point, streaming a dramatic column of daylight into your space. With a frameless interior view, they give the illusion of an open sky above. Perfect for modern homes or commercial projects, these rooflights are mounted on a builder’s upstand and available in custom diameters.
See Our Circular Rooflight Gallery for inspiration.
Rooflight Installation Services
We offer a full installation services for all our flat rooflights throughout London and across the UK.
Our trained dedicated team ensures each rooflight is fitted to the highest standard, with careful attention to thermal performance, waterproofing, and visual finish.
Site surveys and technical guidance are available to support both homeowners and contractors.
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