Hi, As roofing structure is constructed at the later stage, (the building is constructed upwards), it is not too late to accommodate for an openable skylight. So, instead of a fixed skylight, which is basically consisting of a glass panel, you could opt to install an openable skylight, which is a window installation. It is far more expensive than a fixed skylight obviously, maybe about $3,000+ for a small one, but I could assure you that the money would be well spent. The way the air flow the moment the skylight window is being opened could be amazing. There are many brands, for example Velux, and also get the electrical version so that you could open the skylight window with a remote control. Cheers!