Which Skylight Is Better: One Large or Two Small?
By Regal Glass Group
If you're planning to add more natural light to your home or extension, you’ve probably asked yourself:
“Should I go for one large skylight or two smaller ones?”
It’s one of the most common questions we hear — and the answer depends on your space, your design goals, and how you want the light to flow.
At Regal Glass Group, we often guide customers toward our Regal Glass Flat Roof Skylights — available in both large single units and modular frameless configurations. And with our Skylight Calculator, you can even create your own custom layout. Let’s break down the pros and cons of each option and help you decide what’s right for your room.
Table of Contents
💬 Real Questions People Ask
It depends. A single large skylight creates a stunning visual impact, but two smaller ones may spread light more evenly — especially in long or narrow rooms.
Yes — larger glass = more daylight. But layout also matters. Two smaller skylights spaced apart may light multiple zones more effectively.
Not with Regal Glass Flat Roof Skylights. We offer large formats and modular skylight options that can be installed in sections for easier transport and fitting.
Absolutely! With our Modular Skylight Calculator, you can create a bespoke configuration using multiple fixed frameless rooflights — perfect for open-plan designs.
Not always. It depends on size, structure, and installation time. Our team can quote both options so you can compare fairly.
🔍 One Large vs Two Small Skylights — Quick Comparison
| Feature / Factor | One Large Skylight ✅ | Two Smaller Skylights ✅ |
|---|---|---|
| Visual Impact | ✅✅✅ (great statement piece) | ✅ (can balance symmetry) |
| Light Distribution | ✅ (focused) | ✅✅✅ (spread across space) |
| Installation Effort | ✅ (1 cutout, 1 upstand) | ✅ (but more framing work) |
| Easier Transport / Handling | 🚫 (can be bulky for access) | ✅✅ (smaller glass units) |
| Frameless Aesthetic | ✅✅✅ (Regal fixed or modular) | ✅✅✅ (same frameless system) |
| Best for Long Narrow Rooms | 🚫 | ✅✅✅ |
| Best for Square Open Plan | ✅✅✅ | ✅ |
🧠 When to Choose a Large Single Skylight
A single, oversized frameless rooflight — like our Regal Glass 1500 x 2500mm or custom size — is perfect for:
✔️ Open-plan kitchen/living rooms
✔️ Modern extensions
✔️ Dining areas with a central table
✔️ Spaces with high ceilings
🟢 Why it works:
It creates an eye-catching feature and floods the space with light from above — all with minimal framework. The cleaner the lines, the more modern the finish.
🌟 When to Choose Two Smaller Skylights (or Modular Configuration)
Using two smaller skylights — or a modular configuration of frameless units — works best for:
✔️ Long, narrow rooms (like side returns)
✔️ Zoned spaces (e.g., kitchen + dining)
✔️ Hallways or corridors
✔️ Homes where access is tight (upstairs, roof decks, etc.)
🟢 Why it works:
You can tailor the layout to suit your room. Using our Regal Glass Modular Skylight Calculator, you can combine multiple frameless fixed units to create your own custom-sized rooflight — with the clean look of one continuous piece of glass.
🧾 Fixed Skylight Layout Options (with Regal Glass)
| Layout Type | Description | Ideal For |
|---|---|---|
| Single Large Rooflight | One big frameless fixed skylight | Feature glazing in square rooms |
| Two Fixed Skylights (Split) | Two smaller units spaced apart | Long rooms, balanced light spread |
| Modular Frameless Configuration | Multiple fixed units with minimal joins | Custom builds, unique layouts |
| Linear Skylight Strip | 2–4 aligned rooflights with slim gaps | Kitchen islands, corridors |
| Grid or Square Layout | 4 small units arranged in a square | Visual symmetry in open-plan areas |
💡 With the Regal Glass Skylight Calculator, you can create all of these layouts — customised to your exact size and design needs.
🛠 Installation Tips
✅ Plan your layout first – Use the Skylight Calculator to test size and shape
✅ Ensure spacing is symmetrical – Especially in extensions and new builds
✅ Think about furniture placement – Put rooflights over key zones like islands or tables
✅ Consider access for glass delivery – Modular units are easier to handle in tight spaces
✅ Work with your builder – Larger units may require structural reinforcement
✅ Final Thoughts: Go Big, Go Smart — or Go Modular
So — is one large skylight better than two small ones?
✔️ If you want a dramatic, minimal, uninterrupted view of the sky, go with a large frameless fixed Regal Rooflight.
✔️ If your space is narrow or you want to customise the layout, use our Modular Skylight Calculator to create a bespoke, frameless solution with the same clean aesthetic.
Either way, you’re getting Regal Glass quality, low-maintenance fixed glass, and a design that elevates your home with light and elegance.
🛒 Building your dream extension or refurbing a dark space?
🧱 Use our Regal Glass Skylight Calculator to create a custom layout, or shop our most popular large and small frameless skylights for flat roofs.
