Choosing the Right Size Tubular Skylight for Your Space
One of the most important decisions when planning a tubular skylight is selecting the right size. The diameter you choose will determine how much daylight reaches your room, and whether it meets your goals.
Here’s a clear guide to help you decide.
Why Size Matters
Tubular skylights range from compact 250mm units to larger 400mm models. Size affects:
- Light output
- Visual impact on the ceiling
- Suitability for different spaces
Choosing correctly ensures that you achieve the balance of brightness and aesthetics you desire.
Typical Sizes and Their Uses
250mm Diameter
- Ideal for small spaces (laundries, closets, WCs)
- Lights an area up to ~9m²
- Low-profile ceiling diffuser
350mm Diameter
- Most popular size for hallways, bathrooms, and kitchens
- Lights an area up to ~14m²
- Good all-round balance of brightness
400mm Diameter
- Best for larger spaces or higher ceilings
- Lights an area up to ~18m²
- Creates a striking daylight feature
Illustrative Example Only: A 400mm tubular skylight was installed in a Christchurch kitchen. The owners report little need for artificial lighting during the day.
Factors to Consider
- Room Size
- Larger rooms need larger diameters or multiple units.
- Ceiling Height
- Higher ceilings may require a larger skylight to maintain brightness.
- Tube Length and Bends
- Long tubes or multiple elbows slightly reduce light output.
- Intended Use
- Task-focused spaces (kitchens, offices) often benefit from larger units.
Tips for Getting It Right
- Consult with your installer about placement and expected light levels.
- Consider adding more than one skylight in long or irregularly shaped rooms.
- Use diffusers to spread light evenly.
For technical details, see our guide on Tubular Skylight Installation.
Final Thoughts: Brightness Without Guesswork
Choosing the right size ensures your skylight delivers the daylight you expect.
Need help planning your project? Send us your details and we’ll connect you with a trusted expert.
