Home Additions & Extensions Toronto
When you need more space but love where you live, a home addition is the most practical solution. Instead of dealing with the cost and disruption of moving, an addition lets you expand on a property you already know and in a neighbourhood you want to stay in.
Introduction
Homewrap designs and builds home additions across Toronto and the GTA. Rear extensions, second-storey builds, side additions, and bump-outs, all engineered, permitted, and constructed by one team.
We hold a new home builder licence in Ontario, which qualifies us for the structural and new-build scope that additions require. Most renovation contractors are not licensed at this level, which means they're not the right fit for projects that involve new foundations, major structural changes, or significant new construction.
Types of Home Additions We Build
New concrete foundations, frost-protected footings, or pile systems depending on the type of addition and site conditions. The foundation is engineered for the specific loads of the new structure.
Load calculations, beam sizing, connection details, and reinforcement plans. Second-storey additions require a full assessment of the existing structure to confirm it can carry the new load.
The addition is framed, sheathed, insulated, and roofed. The roof tie-in with the existing structure is one of the most technically demanding parts of the project and requires careful planning.
Plumbing, electrical, and HVAC systems are extended from the existing home into the new space. In many cases, the existing mechanical systems need to be upgraded to handle the additional load.
All home additions in Toronto require a building permit. The application includes architectural drawings, structural engineering, and site plans. We prepare and submit the full package and manage the inspection process.
What a Home Addition Involves
New concrete foundations, frost-protected footings, or pile systems depending on the type of addition and site conditions. The foundation is engineered for the specific loads of the new structure.
Load calculations, beam sizing, connection details, and reinforcement plans. Second-storey additions require a full assessment of the existing structure to confirm it can carry the new load.
The addition is framed, sheathed, insulated, and roofed. The roof tie-in with the existing structure is one of the most technically demanding parts of the project and requires careful planning.
Plumbing, electrical, and HVAC systems are extended from the existing home into the new space. In many cases, the existing mechanical systems need to be upgraded to handle the additional load.
Home Addition Cost in Toronto
Home addition costs in Toronto depend on the type of addition, size, structural complexity, and finish level. Here's what homeowners in the GTA are typically looking at in 2026.
A smaller addition or bump-out (50 to 200 square feet) generally costs $60,000 to $150,000. A mid-range rear or side addition (200 to 500 square feet) typically runs $150,000 to $300,000. A full second-storey addition can range from $300,000 to $600,000+, depending on the size of the home and the complexity of the structural work.
Per-square-foot costs for additions in Toronto generally range from $350 to $550 for standard to mid-range work. High-end finishes and complex structural conditions push costs higher.
We recommend a 10 to 15% contingency on addition projects. Unexpected foundation conditions, required upgrades to existing systems, and permit revision requests can add to the budget.
How We Manage Your Home Addition
A home addition is new construction attached to an existing structure. That requires careful engineering, proper permitting, and disciplined sequencing to integrate the new with the old without disrupting either.
We assess your property, review lot dimensions and zoning limits, evaluate the existing structure, and discuss what type of addition is realistic given your goals and budget.
Our team prepares architectural drawings and structural engineering for the addition. We design the new space to integrate with the existing home in terms of layout, roofline, and systems.
We submit the full permit application to the City of Toronto or your local municipality. If a minor variance is needed due to setback or lot coverage limits, we manage that process as well.
Foundation, framing, roofing, mechanical rough-ins, insulation, exterior finishing, and full interior completion. A project lead manages the entire build and keeps you informed at every stage.
We review the completed addition with you in detail, confirm all inspections have passed, and hand over the space fully finished and backed by warranty coverage.
Why Homeowners Choose Homewrap
Home Additions Across the GTA
We build home additions across Toronto and the Greater Toronto Area, including North York, Scarborough, Etobicoke, East York, Vaughan, Richmond Hill, Markham, Mississauga, Aurora, Newmarket, Oakville, Pickering, and surrounding communities.
