Rear additions
Extend the main floor for a larger kitchen, family room or stronger connection to the yard.
Rear + upper-floor additions / Toronto
Rear and Second-Storey
Home Additions in Toronto
Add the space your family needs while making the new work feel connected to the existing home. Y&CO Build coordinates feasibility, design, engineering, permits and construction under one accountable lead.
Discuss your addition with Cory ↘
How much does a Toronto home addition cost?
Short answer: In 2026, Y&CO Build uses an early planning range of $500–$700 per sq. ft. for many rear additions and $450–$650 per sq. ft. for full second-storey and combined additions.
Reviewed September 11, 2026 by Cory Yefet. Property conditions, structure, approvals, mechanical work and finishes determine the actual budget.
Toronto addition contractor
Add Space Without Leaving the Neighbourhood You Love
Rear and second-storey additions touch zoning, structure, mechanical systems and the existing house at the same time. That makes early coordination essential.
Y&CO Build leads the construction process while coordinating designers, engineers, consultants, permits and trades. Homeowners work directly with Cory Yefet from early planning through completion.
Types of home additions
Rear, Second-Storey and Combined Home Additions
Second-storey additions
Add bedrooms, bathrooms, a primary suite or flexible family space above the existing home.
Combined additions
Coordinate a rear extension and upper floor as one structural, permitting and construction project.
Whole-home integration
Rework the existing layout, systems and finishes so the addition feels like part of one resolved home.
Feasibility before drawings
Start With Zoning and Property Feasibility
Setbacks, lot coverage, height, floor space and existing structure can all shape an addition. Reviewing those constraints early helps establish a realistic scope, approval path and budget before design work advances.
Read the Toronto home addition permits and zoning guide →2026 early planning ranges
Cost Ranges for Toronto Home Additions
Rear addition
$500–$700 / SQ. FT.
Typically 200–300 sq. ft. added. Pricing varies based on foundation and structural requirements, exterior finishes and the complexity of integrating the addition with the existing home.
Renovations or reconfiguration of the existing main floor are priced separately.
Full second-storey addition
$450–$650 / SQ. FT.
A complete new second storey, with pricing depending on structural requirements, layout, bathrooms, mechanical upgrades, exterior work and level of finish.
Combined rear + second-storey addition
$450–$650 / SQ. FT.
For larger additions that expand both the footprint and upper level of the home. Pricing varies based on addition size, structural complexity, approvals, interior scope and finishes.
Approximate Canadian-dollar planning ranges based on the supplied 2026 Toronto Home Addition Cost Guide. They are not quotes; actual costs depend on the property, scope, approvals, structure and finish level. Review the complete Toronto renovation cost guide for professional fees, contingency, HST and temporary housing.
Approvals
Permits and Committee of Adjustment
A Toronto addition normally requires coordinated permit drawings and may require zoning review or minor variances. Approval requirements depend on the property and proposal, so feasibility should be reviewed before design advances.
Toronto home addition FAQ
Toronto Home Addition FAQs
What types of home additions does Y&CO Build take on?+
Y&CO Build takes on major rear, upper-floor, second-storey and layout-expanding additions that require coordinated design, engineering, permits and construction.
How much does a Toronto home addition cost?+
Rear additions are typically $500–$700 per sq. ft. Full second-storey and combined rear plus second-storey additions are typically $450–$650 per sq. ft. Actual costs depend on structure, approvals, integration, interior scope and finishes. See how additions fit into a complete renovation budget.
How long does a Toronto home addition take?+
Plan for roughly 9–18 months from early feasibility through move-in, including about 0–6 months for design and permits and about 6–10 months for construction, depending on complexity and approvals.
Will we need Committee of Adjustment approval?+
Possibly. If the proposed addition exceeds zoning rules for setbacks, lot coverage, height or floor space, a minor variance may be required. The property should be reviewed before design advances.
Considering a Toronto home addition?