Premium Flat Roof Windows for Sale 

At Skylights Roof Lanterns, we offer flat skylight window options that sit directly on flat or low-pitch roofs and flood your interiors with consistent daylight throughout the day. Available in both fixed and flat roof window opening models, this category offers superior performance in ventilation, insulation, and aesthetics. With rapid UK delivery, high-spec glazing, and a range of size and color options, Skylights Roof Lanterns makes it easy to find and install the right product.

Explore the finest flat roof windows for sale online, engineered for lasting performance and elegant integration into modern architecture.

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100+ Five-Star Reviews 

Trusted by homeowners, contractors, and architects throughout the UK.

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Fast UK Delivery in 1–3 Days on Most Items

We make sure your in-stock products reach your site promptly and reliably.

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Up to 20-Year Warranty

Enjoy long-term peace of mind with a fully comprehensive guarantee.

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Fully Compliant with UK Building Regulations

Supporting a smooth, regulation-compliant installation for your project.

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Glass Rooflight Fixed and Custom Sizes

Glass Rooflight Fixed and Custom Sizes

£0.00
Rooflight Triple Glazed Self Clean

Rooflight Triple Glazed Self Clean

£0.00
Flat Skylights Brett Martin

Circular Rooflight

£0.00
Brett Martin Access Hatch Roofloghts

Glass Roof Access Hatch

£0.00
Polycarbonate Rooflight Dome

Polycarbonate Rooflight Dome

£0.00
Opening Rooflights

Opening Rooflights

£0.00
Flat Rooflight

Flat Rooflight

£0.00
Brett Martin Flat Skylights

Brett Martin Flat Skylights

£0.00
Electric and Manual Opening Rooflight by Brett Martin

Electric and Manual Opening Rooflight by Brett Martin

£0.00
Mardome Trade Polycarbonate Roof Dome Window

Mardome Trade Polycarbonate Roof Dome Window

£0.00
Mardome Reflex Polycarbonate Dome Rooflight

Mardome Reflex Polycarbonate Dome Rooflights

£0.00
Brett Martin Manual Opening Rooflights

Mardome Manual Opening Plastic Roof Window

£0.00
Access Hatch Rooflight

Access Hatch Rooflight

£0.00
Electric Opening Skylights

Electric Opening Flat Roof Polycarbonate Skylight

£0.00
Brett Martin Modular Linked Rooflights

Large Modular Linked Glass Flat Rooflight

£0.00
Our Best Picks 

Our Best Picks 

We’ve curated a range of high-quality online flat roof windows designed and manufactured in the UK. Here are some standout choices from our current collection: 


  • Flat Glass Rooflight (Custom Size): A fully customizable flat rooflight designed to fit your specific dimensions with precision and elegance.
  • Rooflight Triple Glazed Self Clean: A high-performance triple-glazed unit with self-cleaning glass, designed for superior insulation and low maintenance.
  • Circular Rooflight: A striking round design that adds architectural flair while providing consistent daylight diffusion.
  • Glass Roof Access Hatch: Combines natural lighting with roof access functionality, perfect for terraces or maintenance zones.
  • Polycarbonate Rooflight Dome: A durable, lightweight option with excellent insulation and impact resistance for utility spaces.

Types of Flat Roof Windows We Offer 

No two buildings are the same, so our range of flat roof windows covers a variety of styles, materials, and functionalities to suit every project.

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Non-Opening Flat Roof Windows

Let in daylight without ventilation with non-opening flat roof windows. Perfect for stairwells, landings, and minimal spaces with separate airflow systems.

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Opening Flat Roof Windows

Enhance airflow in kitchens, bathrooms, and sunrooms by opening flat roof windows. Available with manual or automated mechanisms for easy ventilation control.

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Electric Flat Roof Windows

Combine convenience and style with electric flat roof windows. Ideal for modern homes, these units can include rain sensors and thermostats for smart automation.

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Custom Flat Roof Rooflight Window

Our flat roof rooflight window range can be custom-sized up to three meters, perfect for large, open-plan rooms or unique architectural designs.

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Flat Roof Windows Opening with Solar Control

Control sunlight and reduce heat with flat roof window opening models featuring heat-reflective coatings and low-emissivity glass. Smooth, quiet, and built to last.


Find everything from large flat roof windows to flat skylight windows and electric flat roof windows.

Benefits of Installing Flat Roof Windows 

Choosing to buy flat roof windows is more than just a design decision, it’s an upgrade that affects your property’s lighting, ventilation, energy usage, and resale value. Here’s how you benefit when installing these advanced glazing systems:

  • Maximise Natural Light This provides more uniform and extended daylight exposure throughout the day, which is ideal for reducing electricity consumption and improving mood.
  • Improve Indoor Air Quality Ventilated models, including flat roof windows electric opening and manual types, support healthier living environments by increasing airflow.
  • Reduce Energy Bills Many of our flat roof windows for sale come with triple glazing and thermally broken frames. This means less heat escapes during winter and less solar gain occurs in summer.
  • Low Maintenance & Easy Cleaning This keeps your windows crystal clear with minimal effort, especially helpful for flat skylight window installations on high or inaccessible roofs.

Benefits of Installing Flat Roof Windows 

Shop Flat Roof Windows Online!  

Ready to transform your home or commercial space with best-in-class roof glazing? With our curated range of flat roof windows, Skylights Roof Lanterns offers expert support, fast UK delivery, and the latest in architectural glazing. From minimalist designs to opening flat roof windows with smart controls, we’re here to help you find the perfect fit.

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Frequently Asked Questions 

What types of flat roof windows do you offer?  

We offer a wide variety of flat roof windows for sale, including fixed, electric, manual, and custom-sized options, perfect for both residential and commercial applications.

Can I buy flat roof windows in custom sizes?  

Yes, you can buy flat roof windows in custom dimensions to suit your architectural needs. Just contact our team with your specifications, and we’ll guide you through the process.  

Are your online flat roof windows suitable for all roof types?  

Our online flat roof windows are specifically designed for flat and low-pitch roofs. They are not intended for steeply sloped roofs but work perfectly on most modern flat-roof builds.  

What’s the difference between fixed and opening flat roof windows?  

Fixed windows provide natural light only, while opening flat roof windows allow for ventilation. You can choose manual or electric opening systems depending on your accessibility needs.

How energy efficient are your flat roof windows?  

Many of our models feature double or triple glazing, thermal breaks, and low-emissivity coatings, making them some of the most energy-efficient flat roof windows for sale in the UK market.  

Do you deliver across the UK if I buy flat roof windows from your site?  

Absolutely. We offer free delivery across the UK when you buy flat roof windows through our store. Each product is carefully packaged and delivered fully assembled.  

Can I view product specifications before purchasing online flat roof windows?  

Yes, each listing on our website includes detailed specifications, manuals, and brochures to help you choose the right online flat roof windows for your space.  

Are opening flat roof windows easy to operate?  

Yes, our opening flat roof windows are designed for smooth operation, whether they’re manual or electric. Some models even include remote control or smart home integration.

Do the windows come with a warranty?  

All our flat roof windows are backed by a minimum 10-year warranty, offering you peace of mind with every purchase.