RICHMOND HILL · VAUGHAN · MARKHAM · GTA
Home Addition Cost in Richmond Hill & the GTA (2026)
What does a home addition cost in the GTA in 2026? A clear breakdown by type and square foot — second-storey, rear and side additions.
Get Free Renovation Advice — (647) 561-3333$375–$450/sq ft
Mid-range build rate
$280k–$550k
Second-storey addition
$45k–$200k
Rear ground-floor addition
Home Addition Cost at a Glance
| Addition type | Per sq ft | Typical total |
|---|---|---|
| Second-storey addition MOST COMMON | $375–$450 | $280,000–$550,000 |
| Rear / side ground-floor | $360–$480 | $45,000–$200,000 |
| Luxury / complex build | $500–$550+ | $400,000+ |
💬 Every project is different
The figures above are typical 2026 ranges — your actual cost depends on the size of your space, the finishes you choose, site conditions and scope. Tell us your budget and we’ll help you get exactly what you need within it, with a free, itemized quote — no pressure, no hidden fees.
What Drives the Cost?
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Structural & foundation
Second storeys need reinforced load paths; ground additions need new footings.
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Size & finishes
Square footage and finish level are the biggest levers.
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Permits & engineering
Architectural and structural drawings plus a building permit.
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Servicing
Extending HVAC, plumbing and electrical into the new space.
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Site access
Tight lots, grading and matching rooflines add cost.
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Temporary living
Second-storey builds may require moving out for part of the project.
Typical Cost by Component (2026)
Second-storey addition (800 sq ft)$280,000–$360,000
Second-storey addition (1,000 sq ft)$350,000–$550,000
Rear ground-floor extension$45,000–$200,000
Side / bump-out addition$30,000–$120,000
In-law / nanny suite addition$150,000–$350,000
Want More Space — Without Building an Addition?
Razco does not build additions — but we are experts at getting you more usable space without one: opening up your layout by removing walls for open-concept living, finishing your basement, or a full-home renovation. Often faster and far less costly than an addition.
More Space, Less Cost
Before you build an addition, talk to Razco about open-concept wall removal, basement finishing or a full-home renovation — often faster and far cheaper. Free consultation across the GTA.
(647) 561-3333Home Addition Cost FAQ
How much does a home addition cost in Richmond Hill?
In 2026 most GTA additions run $375 to $450 per square foot; a second-storey addition typically totals $280,000 to $550,000, while a rear ground-floor extension ranges $45,000 to $200,000.
How much is a second-storey addition?
Expect $375 to $450 per square foot, roughly $280,000 to $360,000 for 800 sq ft and $350,000 to $550,000 for 1,000 sq ft.
Does Razco build home additions?
Razco does not build additions. We specialize in getting you more usable space without one — open-concept wall removal, basement finishing and full-home renovations.
Is it cheaper to add on or renovate what I have?
Opening up your existing layout or finishing a basement is usually far cheaper than an addition and delivers more usable space faster.
How long does a home addition take?
Most additions take 4 to 8 months including design and permits, depending on size and complexity.