Skylight and rooflight questions answered

Each answer starts with the reply in its first lines and then explains it, so you can stop reading as soon as you have what you need. They are grouped by product, with a few general ones on replacement that apply to any rooflight or skylight. Every answer links back to the product page it belongs to, where the full picture sits.

Some explain what changes the price of a particular product. Some deal with planning: when a lantern or a skylight on a flat roof needs an application, and whether a sun tunnel needs approval. Others are practical, such as how to find a VELUX size code, whether a roof window can be swapped without scaffolding, how long a misted unit can be left, why condensation forms on the inside of the glass, and whether walk-on glass is slippery in the rain. A few weigh up a choice, such as double or triple glazing, or buying a window yourself.

The general answers, listed under skylights and rooflights in general, cover the questions that apply whatever is on the roof: the cost of replacing a skylight, whether a new unit can go into the same opening or needs a new one cut, and whether the work needs scaffolding. If your question is not here, send it by email or on WhatsApp 07880 284133 and we will answer it, or bring it to the survey.

None of them gives a figure, because a price only means something once somebody has looked at the roof and the room. When you are ready, the survey page explains how to book, and the costs overview pulls the price factors for every product into one place. For the longer reads, go to the guides index.