Accessory Dwelling Units (ADUs): Smart, Sustainable Living

Accessory Dwelling Units (ADUs) — also known as secondary suites, garden homes, or laneway houses — are reshaping how homeowners think about space. They offer flexibility, rental income potential, and sustainable housing solutions. At MJ Ontario Constructions, we specialize in designing and building ADUs that comply with all regulations while maximizing comfort and usability.

What Is an ADU?

An ADU is a self-contained living space on the same property as a primary home. It includes its own kitchen, bathroom, and sleeping area, offering independence within a shared lot. ADUs can be attached, detached, or converted from existing structures such as garages or basements.

Types of ADUs We Build

• Basement Conversions: Transforming underused spaces into compliant, rentable units.
• Detached Backyard Units: Building new standalone living spaces from the ground up.
• Garage Conversions: Retrofitting existing structures for living or workspace purposes.
• Additions: Expanding existing homes with fully functional secondary suites.

Why Build an ADU?

ADUs provide financial flexibility and enhance property value. Whether for rental income, multigenerational living, or downsizing options, they’re an efficient way to make your property work harder for you. Ontario’s updated zoning policies and housing regulations encourage homeowners to develop ADUs to address the housing shortage sustainably.

Our ADU Process

From concept to completion, we manage every detail — site assessment, architectural design, permitting, and construction. We ensure compliance with Ontario Building Code and local zoning laws. Our in-house team handles excavation, foundation, framing, plumbing, electrical, and interior finishing — all under licensed supervision.

Quality, Safety, and Compliance

Each ADU we build is fully inspected and certified under HCRA and Tarion standards where applicable. We prioritize long-term value, using durable materials and efficient designs to deliver comfortable, low-maintenance living spaces.