

Expand your Toronto footprint with expertly designed rear, side, and second-story home additions.


We ensure your new addition matches the existing architectural style of your Toronto home, from matching historical brickwork to aligning rooflines. This prevents the 'tacked-on' look common in lower-quality projects and preserves the curb appeal of your property. Our designers focus on interior flow so the transition between old and new feels natural and intentional.
Our team handles all interactions with the City of Toronto building department, including architectural drawings and engineering stamps. We navigate the 2024 Ontario Building Code requirements and Committee of Adjustment hearings so you don't have to manage the bureaucracy. This ensures your project is legally compliant and fully insured from start to finish.
We specifically design additions that maximize your property’s valuation, often yielding between 70% and 85% back in equity. By avoiding land transfer taxes and moving fees, you can reinvest that capital directly into premium finishes and smart home technology. We focus on high-demand features like master suites and modern kitchens that offer the best long-term financial returns.
We begin by analyzing your property against Toronto's zoning bylaws to determine the maximum allowable expansion. This step identifies potential hurdles like tree protection zones or heritage conservation requirements early on. We avoid the common pitfall of designing a space that the city will eventually reject, saving you time and professional fees.
Our designers create detailed CAD drawings that reflect your vision while meeting strict structural requirements. We collaborate with licensed structural engineers to ensure the new addition—and your existing home's foundation—can support the new loads. This step is critical for obtaining the necessary building permits and ensuring long-term structural integrity.
We handle the entire permit application process with the City of Toronto, including all correspondence with city planners. Behind the scenes, we coordinate material deliveries and trade schedules to navigate the logistical challenges of Toronto’s narrow streets. We ensure all necessary inspections are booked and passed so the project remains on schedule.
Construction begins with site preparation and foundation work, followed by framing, roofing, and interior finishing. You receive daily updates through our site supervisors, ensuring you are never in the dark about progress or upcoming milestones. We maintain a clean, safe job site to minimize the impact on your neighbors and daily life.
Yes, a current land survey is almost always required for any addition that expands the footprint of your home. The City of Toronto uses this to verify setbacks from property lines and to ensure your expansion doesn't violate lot coverage maximums. If you don't have an up-to-date survey, we can coordinate with a licensed surveyor to obtain one as part of the pre-construction phase.
A standard building permit for a residential addition typically takes 2 to 6 weeks once the application is submitted. However, if your project requires a minor variance through the Committee of Adjustment, this can add several months to the timeline. We utilize the FASTRACK system when applicable to speed up approvals for our clients in the GTA.
Whether you can remain in the home depends on the scope of the project. For rear or side additions, we can often seal off the construction zone, allowing you to stay in the existing house with minimal disruption. For second-story additions, major structural work usually requires homeowners to vacate for several weeks to ensure safety and allow for roof removal and structural framing.
In the current market, a 500 sq ft addition generally ranges from $225,000 to $325,000, depending on use (e.g., a kitchen with plumbing costs more than a simple bedroom). These costs include foundation, shell, and interior finishes. We provide fixed-price contracts after the design phase to protect you from price fluctuations during the build process.
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Learn MoreBuilt By Pros completed a complex 800 sq ft rear addition on our narrow lot in Toronto last fall. The team managed the difficult lane access and foundation digging in tight quarters with incredible professionalism. They matched our 1920s brickwork perfectly, making the addition look like it was always part of the house. The six-month timeline was exactly as quoted, and the new master ensuite they built is now the highlight of our home.
We needed a dedicated home office and a guest suite, so we opted for a second-story addition. Ricardo's crew was on site every day at 8 AM, and Suzanne kept us updated through every permit hurdle at City Hall. They used high-performance insulation that has made the new space quieter and warmer than the rest of the house. The project was finished in 4 months, and their attention to the custom staircase design was exceptional.
After looking at the cost of moving in Toronto, we decided to add a two-story addition to our bungalow instead. Built By Pros handled the structural engineering required to reinforce our existing foundation, which was a huge relief. They installed massive floor-to-ceiling windows in the new family room that completely changed how we use the house. The project stayed within 5% of the original budget despite some minor material price fluctuations.

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.