

Transform your single-family residence into a legal revenue-generating multiplex with expert design and construction.





Proud to serve communities throughout Etobicoke, ON
We provide expert navigation of Ontario's latest housing legislation, ensuring your project leverages as-of-right multiplex permissions to avoid unnecessary rezoning delays. Our team understands how to maximize unit count while staying within the permitted building envelope, saving you months of administrative headache. We have successfully applied these new rules to homes in The Kingsway and across Etobicoke.
Our conversions prioritize safety and privacy through the installation of high-performance fire-rated assemblies and resilient soundproofing channels between units. We use multi-layered drywall and mineral wool insulation to exceed the minimum Ontario Building Code requirements for STC ratings. This meticulous approach ensures that residents in different units can coexist peacefully without noise complaints or safety concerns.
Every Etobicoke conversion includes a comprehensive evaluation and upgrade of your home's mechanical systems to support multiple independent dwellings. We manage the installation of split hydro meters, upgraded water service lines, and multi-zone HVAC systems tailored to the specific demands of each unit. This ensures each tenant has reliable service and individual billing, simplifying property management for the owner.
We begin by reviewing your survey and existing blueprints to determine your lot's specific permissions under the EHON multiplex framework. We check for zoning overlays, utility capacity, and structural health to ensure your home can support the proposed conversion. This step prevents wasted investment in designs that cannot be legally built.
Our in-house design team creates detailed CAD drawings that maximize your space while strictly adhering to fire and safety codes. We handle all interactions with the Toronto and Etobicoke building departments, managing the permit submission process and any necessary Committee of Adjustment hearings. This ensures your project is fully compliant from day one.
Our crews perform the heavy lifting, including foundation reinforcement, rough-ins for new kitchens and bathrooms, and the installation of fire-rated separations. We coordinate all specialized trades—from licensed electricians to HVAC techs—ensuring that services like water and power are appropriately scaled for multiple families. We maintain a clean site and provide regular updates on structural progress.
The final stage involves high-quality interior finishing and the critical final inspections required for a Certificate of Compliance. We walk you through each completed unit, testing all systems and ensuring that elements like soundproofing and fire-closers are functioning perfectly. We hand over a turnkey multi-unit property, fully legalized and ready for occupancy.
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Learn MoreRicardo and his crew converted our aging 1960s detached house in Mimico into a beautiful, legal triplex. They handled everything from the complex plumbing overhauls to the precise fire-rating between floors over a six-month timeline. The craftsmanship in the two new kitchens, featuring quartz countertops and custom tiling, was exceptional. Having a dedicated site supervisor like Bastian made the communication seamless, even when we ran into a structural surprise behind a 50-year-old wall.
We wanted to create a high-end duplex for my parents to move into, and Built By Pros delivered a stunning result that matched our home’s heritage aesthetic. The project involved a significant rear addition and underpinning the basement to achieve a 7-foot ceiling height, which was a massive undertaking. Suzanne's design for the separate entrance perfectly blended with our existing stone exterior, maintaining our curb appeal. They finished the project right on schedule, through a very snowy winter, and the quality is obvious in every corner.
Investing in a fourplex conversion was a big step for us, but the team at Built By Pros made it manageable. They navigated the Rexdale parking bylaws effortlessly and managed all the CAD drawings and permit submissions for our additional residential unit. The soundproofing between the units is so good you wouldn't even know there were three other families living under the same roof. The transformation of our single-family home into a functional, modern multi-unit residence has significantly boosted our property value.

Ricardo Lora

Suzanne Morgan

Petra Tobias

Stronger Together

Bastian Zuniga

Marco Lopez
Contact us for unmatched expertise in home renovations. With experience since 2008, we deliver top-quality materials and superior workmanship—trusted by clients and built on referrals.