There’s something about spring sunlight that makes us crave more of it — in our homes, our routines, and our renovation plans. Whether you're deep into a remodel or just dreaming via your Pinterest board, skylights and sun tunnels offer a smart (and beautiful) way to bring more natural light indoors.

But not all skylights are created equal. Behind that clean slice of sky is a wide range of materials — from acrylic domes to energy-efficient glass to high-tech polycarbonate. And the one you choose affects everything from your home’s comfort to its carbon footprint.

In this edition of Materials Matter, we’re shining a light on the materials behind modern skylights and sun tunnels — and how to choose the right one for your space.

Why Skylights & Sun Tunnels Matter

Skylights and sun tunnels (also known as tubular skylights) do more than brighten a room. They can:

• Reduce your reliance on artificial lighting

• Improve mood and wellbeing

• Add architectural character

• Increase resale value — especially in spaces with limited wall windows

What many homeowners overlook is how the material inside that skylight or dome affects key performance features: UV protection, energy efficiency, condensation resistance, and even sound insulation.

Glass Skylights: Clean, Clear & Energy Smart

Best for: Kitchens, bathrooms, vaulted ceilings, and any space where long-term performance matters

Glass is the standard for high-quality skylights — and not just for its aesthetics. Today’s skylight glass is typically double- or triple-glazed, Low-E coated, and sometimes argon-filled for insulation. These features help regulate indoor temperatures while still delivering that warm natural light.

Pros:

• Excellent clarity and longevity

• Resists yellowing and surface scratches

• Offers strong UV and thermal performance with proper coatings

Cons:

• Heavier than plastic alternatives

• More expensive upfront

• Can be vulnerable to breakage unless laminated or tempered

Pro tip: In colder climates like Toronto, choose ENERGY STAR® certified models with laminated safety glass for year-round comfort.

Acrylic Domes: Lightweight & Budget-Friendly

Best for: Flat or low-slope roofs, garages, sunrooms, and budget-conscious builds

Acrylic skylights have been a mainstay in residential architecture for decades. They’re lightweight, easy to install, and cost-effective — making them popular for dome shapes and tubular skylights. Modern acrylics offer better UV resistance than older versions but may still yellow or crack over time if not maintained.

Pros:

• Lightweight and simple to install

• More affordable than glass

• Shatter-resistant and flexible

Cons:

• Can discolor or become brittle with age

• Less energy-efficient than other materials

• More prone to surface scratches

Insider insight: Replacing an old acrylic skylight with a new glass model often results in a noticeable improvement in clarity and thermal performance.

Polycarbonate: Tough, Impact-Resistant, and Versatile

Best for: Areas exposed to hail, high winds, or extreme weather; modern additions and greenhouses

Polycarbonate is a high-impact material commonly used in skylights and sun tunnels where strength is a top priority. It mimics the look of glass but is far more durable, making it a go-to for flat roofs or weather-prone regions.

Pros:

• Virtually unbreakable and highly impact-resistant

• UV-stabilized versions available

• Lightweight and structurally strong

Cons:

• Can scratch more easily than glass

• May yellow or cloud over time, depending on quality

• Less thermally efficient unless treated or in multiwall form

Good to know: Multiwall polycarbonate offers built-in insulation and natural light diffusion, making it ideal for softer, glare-free illumination.

Don’t Forget the Frame

While glazing gets most of the attention, skylight frames also impact performance and aesthetics. Common frame materials include:

• Vinyl: Low maintenance, affordable, and reasonably energy-efficient

• Wood: Warm and natural-looking, but requires regular care

• Aluminum-clad wood: Offers the look of wood indoors with added weather protection outside

For better thermal performance, look for frames with thermal breaks — especially if energy efficiency is a priority.

Sun Tunnels: Small Openings, Big Impact

Not ready to commit to a full skylight? Sun tunnels are an excellent alternative. These tubular daylighting devices use a highly reflective interior to channel sunlight from your roof into interior spaces like closets, powder rooms, and hallways — all with minimal structural work.

Key material components:

• Domes: Usually made from acrylic or polycarbonate

• Tubes: Often aluminum with a reflective coating

• Diffusers: Typically frosted glass or plastic for soft, even light

Glow Smarter, Not Harder

Skylights and sun tunnels aren't just about bringing in the sun — they’re high-performance building components. Whether you prefer the crystal clarity of glass, the toughness of polycarbonate, or the affordability of acrylic, your material choices will affect comfort, efficiency, and longevity.

With the right materials, your home can feel brighter, better, and more connected to the outdoors — season after season.