Choosing the right skylight size is essential for perfect daylight and a watertight fit. The size of a skylight is always based on the daylight size — the inside measurement of the curb (the inner edge-to-edge opening).

For example, if the inside dimension of your curb is 100 cm x 100 cm, you need a Skylux 100 x 100 cm skylight. The outer dimensions of the dome and curb will always be slightly larger to ensure proper overlap and sealing.

When replacing an existing skylight, always measure:

1. The inside opening (daylight size).
2. The outside size of the curb (if reusing it).
3. The roof opening if you plan to install a new curb.

Tip: Never base your measurement on the outer size of the skylight — this can lead to a mismatch. Always use the daylight (inner) size for correct fitting.

For a full step-by-step guide with visuals, visit: How to determine the size of your Skylux skylight

• Acrylic (PMMA): crystal clear, UV-resistant, and scratchproof — the best choice for clarity and long-lasting transparency.
• Polycarbonate (PC): 250 times stronger than glass, highly impact resistant — ideal for stormy or high-risk areas.

Not necessarily. Screw positions may vary by brand or model. When replacing only the dskylight, you can drill new holes in the existing curb. Always use new seals for watertight installation.

Yes, you can build a wooden upstand yourself. If you prefer to use your self-built curb, we advise placing a Skylux adapter or renovation frame between the curb and your new skylight or flat roof window. This ensures an airtight, watertight connection and guarantees the correct fit between both parts.

Yes. You can replace just the dome if the existing upstand is in good condition.

Our skylights come with up to 10 years of warranty, depending on the model and material. This covers UV resistance, transparency, and structural stability.

Use lukewarm water with mild soap and a soft sponge. Avoid aggressive cleaners, alcohol, or abrasive materials that can damage the surface. Regular cleaning keeps your skylight clear and bright.