Rock Bottom Underpinning: Expand your living space with a Basement Addition ! For over 35 years, we’ve been experts in creating beautiful, functional basements in Toronto. Our Basement Addition services add valuable square footage to your home, increasing its functionality and value. We handle the entire process, from permits and planning to meticulous construction. Enjoy a home theater, guest room, or in-law suite – endless possibilities! Contact Rock Bottom Underpinning today and unlock the potential of your home with a custom Basement Addition!