Replacement Skylight Diffusers

A faded or broken skylight diffuser not only looks bad but also reduces the amount of light distribution from your skylight. Fixing this is as simple as ordering a new skylight diffuser, removing the old one and installing the new one. This is something you can do yourself in most cases and only takes a few minutes to do. The first step is measuring your existing skylight diffuser.

How to measure your skylight diffuser

To get an accurate measurement of your existing skylight diffuser, you'll need to remove it from the ceiling surround (the frame that holds it in place). This can be done by gently lifting the diffuser sheet upwards, carefully grasping it in hand and guiding it through the ceiling surround.

For square diffusers, measure the length and the width. For round diffusers, measure the diameter. Write these down and then double check them.

There's a good chance that the measurement will match a pre-cut diffuser size but if it doesn't, you can still order a custom size.

how to measure your skylight diffuser

Pre-cut Skylight Diffusers

SQUARE Skylight Diffusers

Replacement square diffusers and surrounds are available by ordering from Supreme Skylights. Please ensure you measure the dimensions accurately or have one of our team do this for you.

square skylight diffuser

Prismatic or Plain Opal - diffuser only

385x385 - $32 (suits 400x400)
385x585 - $48 (suits 400x600)
385x785 - $63 (suits 400x800)
485x485 - $50 (suits 500x500)
485x785 - $79 (suits 500x800)
585x585 - $71 (suits 600x600)
585x785 - $95 (suits 600x800)
685x685 - $97 (suits 700x700)
785x785 - $127 (suits 800x800)
Custom size - contact us

aluminium ceiling surround for skylights

White powder coated aluminium ceiling surround

400x400 - $90
400x600 - $99
400x800 - $109
500x500 - $99
500x800 - $114
600x600 - $109
600x800 - $119
700x700 - $119
800x800 - $129
Custom sizes available - contact us

square skylight flexishaft

Square flexishaft

400x400 - $45 p/m
400x600 - $53 p/m
400x800 - $61 p/m
500x500 - $53 p/m
500x800 - $66 p/m
600x600 - $67 p/m
600x800 - $70 p/m
700x700 - $70 p/m
800x800 - $78 p/m

Postage can be arranged at an additional cost depending on weight, location and packaging OR collect in-store  from 109 Murphy St, Wangaratta, VIC 3677 (provided COVID restrictions allow at the time).

ROUND Skylight Diffusers

Round ceiling diffusers and surrounds are available by ordering from Supreme Skylights. We have a range of pre-cut sizes available in-store.

replacement round skylight diffuser
replacement round skylight domes
Lightbeam diffusers and ceiling surround (comes together, no separating)

400mm diameter - RRP $196.28
300mm diameter - RRP $166.53


Round prismatic diffusers only

300mm - $30 ea
350mm - $32 ea
400mm - $32 ea
500mm - $55 ea
550mm - $69 ea


Round Flexishaft also available

300mm - $50 per meter
350mm - $55 per meter
400mm - $60 per meter


Postage can be arranged at an additional cost depending on weight, location and packaging OR collect in-store (109 Murphy St, Wangaratta).


Custom Size Skylight Diffusers

For custom size replacement skylight diffusers, please measure your existing diffuser and contact us with these measurements. We'll then provide you with a quote including shipping costs and advise on delivery time frames. Please note that we are unable to accept returns for incorrectly sized diffusers (unless we supplied the wrong size) so ensure you measure twice to avoid errors.

How To Replace A Skylight Diffuser

Replacing a skylight diffuser is a quick, easy job. You may require a ladder for high ceilings and a pair of gloves to protect your hands.

  1. Remove the existing skylight diffuser by carefully pushing the sheet upwards so you can grasp it. Then rotate it by 45 degrees and gently guide it through on a diagonal (opposite corners).

    NOTE: For round skylight diffusers, you may need to bend the sheet slightly so it will fit through the ceiling surround.

    TIP: We recommend you take care when handling the diffuser sheet as they can have sharp edges - use gloves if you have them.
  2. Wipe the new skylight diffuser with a damp cloth to ensure its free of dust and fingerprints.
  3. Install the new skylight diffuser by guiding it through the ceiling surround on a diagonal (opposite corners), rotating it 45 degrees and lowering it into place.

    TIP: using gloves will also stop you getting fingerprints on the diffuser.

Order A Replacement Skylight Diffuser

Give us a call on 1300 35 15 15 to order a replacement skylight diffuser, or