Specialists in Architectural Basement Transformation

Thinking about renovating your basement?

At onlyBASEMENTS, with over a decade of focused expertise, we integrate structural engineering, architectural design, and construction under one roof. Our in-house team—including architects, engineers, and experienced project managers—guides each project from concept to completion through a fully coordinated process.

We are dedicated to the thoughtful reimagining of underutilized basement spaces into architecturally integrated spaces. Whether for multi-generational living, passive income, or enhanced lifestyle amenities, our goal is to design and build basements that are as inviting and as nice as any above-grade space. We transform basements into beautifully designed, purposeful spaces that reflect your unique needs and enhance your lifestyle.

Our Services

Basement Finishing

We believe that a professionally finished basement not only adds significant livable square footage but also enhances your home’s functionality and increases its resale value. Whether you envision a cozy family lounge, a guest suite, or a legal rental apartment.

Underpinning & Waterproofing

Underpinning is the process of safely lowering your basement floor to increase ceiling height, improve functionality, and new possibilities for your living space. The process involves digging a sequence of carefully planned holes beneath the existing foundation walls.

Legal Rental Units

With over a decade of experience in Toronto’s established neighbourhoods, we handle the lifecycle of legal suite projects. Our integrated team—covering architectural, structural, and construction—ensures you work with one accountable company from start to finish.