Hi, mate! Installing a skylight on a flat roof is a proper job but totally doable with the right approach. First off, make sure your skylight is meant for flat roofs; you’ll need a model designed to handle the water runoff. Start by creating a frame (or upstand) on your roof where the skylight will sit. This needs to stick up about 150mm above the roof surface to keep things watertight.

Next, measure and cut out the opening where the skylight will go. Once you’ve got your hole, it’s all about sealing and flashing. Apply a sturdy waterproof membrane around the frame, then fix your skylight in place. Most importantly, ensure you use proper flashing kits specifically made for flat roofs—they’re lifesavers for preventing leaks.

Finally, double-check all your seals and use high-quality silicone to secure everything. A bead of the good stuff around the edges will help keep the elements out. And there you go, you’ve got yourself a skylight! Just make sure to follow any specific instructions from the skylight manufacturer, and you’ll be golden. Cheers!