Adding more natural light to your home can dramatically transform the way a space feels—making rooms appear larger, brighter, and more inviting. One of the simplest and most effective ways to achieve this is by installing a fixed rooflight. Whether you’re planning a kitchen extension, loft conversion, or flat roof renovation, a fixed flat rooflight brings in consistent daylight without the need for mechanical components.
Thanks to modern eCommerce platforms, it’s now easier than ever to buy fixed rooflights online. But with so many options available, choosing the right product can be overwhelming—especially if you’re new to glazing terminology or construction standards.
This guide walks you through every essential step in selecting the perfect fixed rooflight for your home—from glazing choices to frame types and delivery logistics—so you can shop confidently and ensure your new installation delivers both style and performance.
1. Understand What Fixed Rooflights Are (and Are Not)
Before you start shopping, it’s important to understand what makes a rooflight “fixed.” A fixed rooflight is a non-opening unit designed purely to let in light. It’s permanently sealed and does not offer any ventilation. This makes it an ideal option for:
- Flat roof kitchen or dining room extensions
- Hallways or stairwells needing extra daylight
- Loft spaces where ventilation is provided elsewhere
- Rooms where thermal performance is prioritized over airflow
If you need airflow or intend to use the rooflight for access, you’ll want to consider opening or hinged models instead.
2. Choose Your Glazing Type Wisely
When you buy fixed rooflights, the type of glass you select plays a major role in light diffusion, thermal efficiency, and privacy. Here are the most common options:
Double vs. Triple Glazing
- Double-glazed rooflights are standard and provide good insulation for most homes.
- Triple-glazed options offer enhanced thermal efficiency, reduce condensation risk, and are ideal for passive homes or cold climates.
Clear vs. Tinted or Frosted Glass
- Clear glass allows maximum light and sky views but can result in glare.
- Tinted glass (usually grey or bronze) reduces glare and solar gain.
- Frosted or obscure glass enhances privacy, ideal for bathrooms or overlooked areas.
Low-E Coatings and Solar Control
Some fixed rooflights come with low-emissivity (Low-E) coatings to reduce heat transfer, or solar control glazing to prevent overheating in summer. These features are highly recommended for large glazed areas facing direct sunlight.
3. Know Your Frame Options
The frame that surrounds your glass rooflight isn’t just a structural element—it also affects insulation, sightlines, and appearance. When shopping for online fixed rooflights, you’ll typically encounter these frame types:
Thermally Broken Aluminium
This is the most common frame material for modern rooflights. It’s lightweight, strong, corrosion-resistant, and thermally efficient—especially if it includes a thermal break to prevent heat loss.
Frameless (or Internal Frameless)
Many premium rooflights now offer a frameless internal view, meaning from inside the room, all you see is the glass. This gives a sleek, minimalist appearance and maximizes the visible sky.
Composite Frames
Some rooflights combine aluminium exteriors with timber or PVC internal components. These may offer better U-values or match specific design schemes but can be heavier or more expensive.
4. Measure Carefully and Consider Upstand Requirements
One of the most common mistakes homeowners make when they buy fixed rooflights online is choosing the wrong size. Rooflights are typically measured by the external kerb size, internal opening size, or visible glass size—and these can vary significantly between manufacturers.
Tips for Measuring
- Confirm whether the product dimensions include the upstand or kerb.
- If you’re replacing an existing rooflight, measure the opening in the roof deck.
- When in doubt, ask for a technical drawing or product spec sheet.
Many fixed rooflights require installation onto an upstand—a raised frame that ensures water runoff and secures the rooflight in place. Some products include a built-in upstand; others require one to be built or purchased separately.
5. Check Thermal Performance Ratings
Fixed rooflights contribute to a building’s energy efficiency. When shopping online, always check the product’s U-value, which measures how much heat escapes through the unit. Lower U-values indicate better insulation.
Ideal U-Values:
- For double-glazed units: around 1.2–1.6 W/m²K
- For triple-glazed units: as low as 0.6–1.0 W/m²K
Also look for products that are compliant with Part L of the Building Regulations in the UK or equivalent standards in your region.
6. Review Delivery Options and Installation Guidance
Unlike small household items, rooflights are fragile, bulky, and require careful handling. Before placing your order, make sure to:
- Check delivery times—especially if your builder is working to a deadline
- Confirm packaging and transport method (palletised, crane-lift, etc.)
- Review return policies in case of damage or incorrect sizing
- Download installation guides—these are usually available on supplier websites
Some suppliers offer installation services or technical support, which can be valuable if your project involves custom details or complex roof structures.
7. Compare Trusted Suppliers and Read Reviews
Not all suppliers are created equal. When purchasing online fixed rooflights, prioritize companies that provide:
- Clear technical specifications
- CE or UKCA certification for construction products
- Thermal and safety performance data
- Customer reviews or case studies
- Good customer support (phone or live chat)
Avoid retailers that don’t offer transparent product descriptions or won’t provide documentation when requested. Remember—your rooflight isn’t just decorative; it’s a critical part of your home’s structure and envelope.
Final Thoughts
Buying a fixed rooflight online doesn’t have to be complicated. By understanding your needs and following this step-by-step checklist, you can confidently select a product that fits your space, budget, and design goals.
From choosing the right glazing and frame to measuring properly and planning delivery, each decision plays a role in the final result. Whether you’re tackling a self-build, hiring a contractor, or simply upgrading a dark room, a well-chosen fixed rooflight can bring life, energy, and value into your home.
Now that you know what to look for, it’s time to buy fixed rooflights with confidence—adding clarity to your design and daylight to your everyday living.
