Home Additions & Extensions in Toronto & the GTA
More space, built to match your existing home.
Adding space to a Toronto home — a second storey, a rear or side extension, or a garden suite — has to respect the existing structure, the lot's angular planes, and the City's permit process. Nexon Build designs and builds home additions and extensions across the GTA that integrate seamlessly with your home, inside and out.
Second storeys, rear additions, home extensions, coach houses, and garage conversions — designed and built to integrate seamlessly with your existing structure. A home addition (building up or adding volume) and a home extension (pushing the footprint out) both let you gain space without moving.
What's included
- —Structural engineering coordination
- —Permit application
- —Foundation and framing
- —Tie-in to existing mechanical systems
- —Interior and exterior finishes
How it works
- 01Site assessment and structural review
- 02Design coordination
- 03Permits (8–14 weeks)
- 04Construction (3–8 months)
- 05Handover
Home Additions cost in Toronto
A home addition or extension in Toronto typically runs $400–$700 per square foot of new space — often higher than new construction because you're tying into an existing structure, roof, and mechanicals. A second-storey addition usually lands around $300K–$550K all-in.
Every project is different — get a free, itemized estimate in under 60 seconds, or see the full Toronto renovation cost guide.
Home Additionsacross Toronto & the GTA
We deliver home additions throughout Toronto and the surrounding Greater Toronto Area, including:
Related projects
Common questions
How much does a home addition cost in Toronto?+
Roughly $400–$700 per square foot of new space in 2026. A full second-storey addition typically runs $300,000–$550,000 depending on size, foundation work, and finishes.
What's the difference between a home addition and a home extension?+
A home addition usually means adding volume — most often a second storey. A home extension pushes the existing footprint outward (a rear or side extension) on the same level. We build both; which one fits depends on your lot, budget, and how you want to use the space.
Can you add a second storey to any house?+
Most detached homes in Toronto can carry a second-storey addition, but the existing foundation and framing must be assessed first. We start with a structural review before committing to a design.
Do additions need a permit or variance in Toronto?+
Yes — additions require a building permit, and if the design exceeds height, setback, or coverage limits it also needs a minor variance through the Committee of Adjustment. We manage both.
How long does an addition take?+
Plan for 8–14 weeks of permitting followed by 3–8 months of construction, depending on scope and whether a variance is required.
Do I have to move out during an addition?+
Often no — many additions can be built while you live in the home, though a second-storey addition involving the roof usually means relocating during the most disruptive weeks.
Related guides
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