Sheerline Flat Rooflight System
Expertly crafted to flood your home with natural light
Bring More Natural Light Into Your Home, our Sheerline Flat Rooflights are designed to transform
interior spaces by introducing generous amounts of natural daylight from above.
With sleek styling, outstanding performance, and minimal maintenance requirements, they offer a modern and elegant solution for flat roof extensions and contemporary homes.
Key Features
Exceptional thermal insulation up to 1.0 U-value W/(m²K) and triple glazed U-Value up to 0.5 W/m²K
TOUGHENED SAFETY GLASS – Ensures safety and durability.
WATER TIGHT Seamless design ensures exceptional water tightness. Leak-free rooflights.
Modern Design With Minimal Visual Impact
The Sheerline Flat Rooflight System sits neatly within the roofline, creating a discreet and contemporary look from the outside. Internally, its rimless edge and seamless plasterboard finish give the impression of looking directly up at the sky — a design that maximises natural light and visual openness.
This makes it a perfect solution for single-storey extensions or properties where height restrictions limit the use of traditional roof lanterns. Sheerline Flat Rooflight System
Roof Glazing Made Simple!
Key Benefits
Exceptional Thermal Performance
Advanced glazing options provide excellent insulation levels, helping maintain a comfortable indoor temperature throughout the year.
Double glazed U-value up to 1.0 W/m²K
Triple glazing options achieving as low as 0.5 W/m²K
Toughened Safety Glass
High-strength safety glass ensures durability, security, and peace of mind while allowing maximum daylight into your home.
Outstanding Weather Protection
A seamless, watertight design combined with double rebated weather seals protects against the UK’s challenging weather conditions and helps prevent leaks.
Elegant Slimline Appearance
Ultra-low profile sightlines and refined detailing create a sleek architectural finish that complements both modern and traditional homes
Why choose Marlin Windows?
Family-run manufacturer with over 20 years’ experience
Made-to-measure products
Fast quote turnaround (typically within 24 hours)
Lead times from 2–3 weeks (stock colours)
Visit our Keighley showroom to see products in person
We combine quality manufacturing with personal service to help you get the right solution for your home
Reliable national delivery
A complete service, from survey to installation across the North of England
Flexible Design Options
The Sheerline Flat Rooflight system has been developed to suit a wide range of project requirements.
Features include:
Multiple rooflights can be combined within a single roof structure
Simple installation with colour-coded components
Suitable for installation into new builds or existing structures
Structural calculations tailored to your postcode
Backed by a 10-year warranty
Large glazing spans can be achieved without intrusive tie bars, allowing expansive views of the sky and plenty of daylight inside your home.
Glass Types
Available in clear, solar clear, solar blue, solar grey or satin privacy glass plus laminate options for UV protection. Flat Roof lights promise seamless, leak-free, and fully weatherproof performance.
All external pane glass types are Low-E, with a choice of double or triple glazing. Toughened and laminated safety glass ensures optimium security and durability.
“Great quality products along with great customer service. Easy to recommend.”
Sheerline Flat Rooflight System Standard Sizes
- 300 x 300 mm*
- 400 x 400 mm*
- 500 x 500 mm*
- 600 x 600 mm*
- 600 x 900 mm*
- 600 x 1200 mm*
- 600 x 1800 mm *
- 1000 x 1000 mm*
- 1000 x 1200 mm*
- 1000 x 1500 mm*
- 1000 x 2000 mm*
- 1000 x 2500 mm*
- 1000 x 3000 mm* *Internal opening size
BESPOKE SIZES AVAILABLE UPON REQUEST
Unique Thermal Technology
Our innovative Thermlock® multi-chamber thermal design, helps keep you and your property well insulated against the worst of the UK weather. Insulating chambers act as a thermal break and work in conjunction with high performance glazing to create class leading thermal performance, far superior to traditional polyamide thermal breaks.
Document Downloads
Sheerline Bespoke Brochure
Latest projects
SLIDING DOORS
Cross Hills – Spectacular Eco Friendly Design
CONTEMPORARY WINDOWS
Early 70's Property Renovation, Windermere – Contemporary Glazing
HERITAGE WINDOWS AND DOORS
Millhouses, Sheffield – Heritage Windows and Doors
Ready to transform your extension with more natural light?
Get a made-to-measure quote for your Sheerline Flat Rooflight today. Our team will guide you through sizes, styles and glazing options to find the perfect fit for your home.
Request your free quote
Visit our showroom
Or call us on 01535 603909 to speak with our team.
Frequently Asked Questions
If you require any support, please don’t hesitate to review our FAQs below or drop us a message on our contact form here
What is a Sheerline flat rooflight?
A Sheerline flat rooflight is a modern glazed roof window designed for flat roofs, typically installed on single-storey extensions, kitchen extensions, or garden rooms. It sits flush with the roofline to provide a sleek, minimalist appearance while allowing large amounts of natural light into your home
What information must be provided in order to get an accurate quotation?
We will ask you to provide the following information:
- Approximate dimensions (width x height)
- Basic design/layout
- Colour
- Project location
Are Sheerline flat rooflights energy efficient?
Yes. Sheerline flat rooflights are designed with high-performance glazing and advanced insulation technology. Triple-glazing options can achieve U-values as low as around 0.5 W/(m²K), helping to reduce heat loss and improve energy efficiency.
Can a flat rooflight be installed on any flat roof?
Most flat roofs can accommodate a rooflight, but the roof must have a slight pitch to allow rainwater drainage. Flat roof glazing systems typically require a minimum pitch of around 3° to ensure proper performance and weather resistance.
Are Sheerline rooflights secure?
Yes. Modern rooflight systems are designed with toughened or laminated safety glass and strong aluminium frames. These features help ensure durability, safety, and resistance to weather and impact.
Come and explore…
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