TSI™ is a brand you can trust as we were created to provide property owners with cost-effective skylight repairs, installation, and maintenance in Toronto. We’re a brand you can trust for premium skylight solutions, and we take pride in our ability to deliver expertly, no matter the project. We know that adding more light to your space is as simple as installing a skylight. It might not be so simple, but we simplify the entire process and open up your space to natural light.