New foundation construction in Toronto — project example

New Foundation Construction Toronto

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20+

Years Pouring Concrete

Verified Reviews

5★

Commitment to Excellence

Foundation Construction for Additions & New Builds

New foundation construction in Toronto for home additions, garages, and new builds. From permits to pouring, we manage the full project with drainage built in from day one.

Cornerstone builds new foundations for home additions, detached garages, and new residential construction across Toronto. From planning and permits to excavation and pouring, we manage the full installation — built to code with proper drainage from day one. We follow the new 2024 Building Code requirement for radon mitigation measures by including rough-in for subfloor depressurization, enhanced sealing of concrete slabs, and installation of soil gas barriers. This is new and is now standard with all of the jobs that we do.

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Garage & Laneway House Foundations

From standard garage pads to deep foundations for modern Toronto laneway suites, we handle the excavation, footings, and slabs required for these standalone structures.

Service Areas

Building Foundations Across Toronto & Mississauga

We construct new foundations for additions, laneway houses, and custom builds across Toronto, East York, North York, Forest Hill, Beaches, Leaside, Rosedale, Cabbagetown, Scarborough, and Mississauga.

Toronto East York North York Forest Hill Beaches Leaside Rosedale Cabbagetown Scarborough Mississauga

20-Year Foundation Guarantee

Because we install waterproofing and drainage before backfilling, we guarantee your new foundation against water intrusion.

Toronto's Trusted Builders

20+

Years Forming

10 Areas

Toronto + Mississauga

20 Yr

Structural Warranty

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Speak with Saverio directly about your project. No obligation, no pressure — just honest advice from someone with 20+ years of experience.

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Quick FAQ

New Foundation & ICF FAQs

Have questions about ICF versus poured concrete, the cost of a foundation for an addition, or our timeline? Find your answers here.

How much does a foundation for an addition cost?

It depends on size, depth, and soil conditions. We provide a detailed quote after reviewing your plans and visiting the site. Contact us for a project-specific estimate.

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Do you handle the excavation and soil removal?

Yes. We handle excavation, soil removal, and site prep. Our crews work on tight Toronto lots with limited access and coordinate to minimize disruption to your property and neighbours.

What is the difference between poured concrete and ICF foundations?

Poured concrete is the traditional method — strong and cost-effective. ICF (Insulated Concrete Forms) uses foam blocks that stay in place after the pour, adding built-in insulation. ICF costs more upfront but can reduce heating costs over time. We build both and can recommend the best fit for your project.

Do I need a building permit for a foundation in Toronto?

Yes. Every new foundation in Toronto requires a building permit, engineered drawings, and City inspections. We coordinate the permit process and inspections from start to finish. You receive all signed-off documentation for your records.

Can you build a foundation for a laneway house or garden suite?

Yes. Toronto allows laneway suites and garden suites, and we build the foundations for them. We handle zoning, setback, and code requirements and design the right foundation for your lot.

Learn about our waterproofing integration

Recent Foundation Builds

Explore our recent work ranging from custom home footings to complete ICF laneway house foundations across Toronto.