What are the opening hours?

Monday 8am - 5pm Tuesday 8am - 5pm Wednesday 8am - 5pm Thursday 8am - 5pm Friday 8am - 5pm Saturday 9am - 1pm

LEFF

Name: LEFF
Address: 1594 QUEEN Street EAST, Toronto, ON, M4L1G2, CA
Telephone: +16479901242
Price range: $$$

Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from LEFF, Industrial Company, 1594 QUEEN Street EAST, Toronto, ON.

Cold-formed steel, especially in the form of thin gauge sheets, is commonly used in the construction industry for structural or non-structural items such as columns, beams, joists, studs, floor decking, built-up sections and other components.

06/12/2026

🏗️ 421 Markham — Engineered Frame System Taking Shape

Progress is moving fast at 421 Markham.

The structural steel frame and LEFF Hybrid Floor System are rapidly transforming the site into a high-performance structure built for strength, precision, and longevity.

Every beam, column, and connection is engineered to exact specifications, ensuring faster installation, superior load performance, and uncompromising quality from the ground up.

✔ Engineered steel frame system
✔ Long-span structural capability
✔ Non-combustible construction
✔ Precision fabrication & assembly
✔ Faster project delivery
✔ Built for decades of performance

This isn’t traditional construction.
This is structural innovation in action.

💡 Powered by LEFF’s Advanced Hybrid Structural Technology
🔥 Because Old Ways Burn — and we’re redefining how buildings are built.

📍 421 Markham, Toronto
🏗️ LEFF Engineered Frame & Hybrid Floor System

📞 647-990-1242
🌐 leff.ca
📩 [email protected]
🔗 Leffin

👉 Planning a custom home, townhouse, or multi-unit development?

Partner with LEFF and discover how advanced steel framing can reduce timelines, improve structural performance, and deliver unmatched precision.

SteelFraming
ColdFormedSteel
StructuralEngineering
TorontoConstruction
ModernConstruction
PrefabConstruction
CustomHomesToronto
BuildingInnovation
ConstructionTechnology
FutureOfBuilding
NonCombustible
FireResistant
DesignBuild
ConstructionLife
BuiltWithLEFF

06/08/2026

🏗️ 421 Markham, Project Progress Report

Innovation takes shape one panel, one beam, and one floor at a time.

At 421 Markham, LEFF’s advanced Hybrid Floor System is coming together with precision-engineered steel framing and prefabricated structural components designed to accelerate construction without compromising performance.

From structural steel integration to our high-performance hybrid floor assembly, every element is manufactured for accuracy, durability, and long-term reliability.

✔ Faster installation
✔ Non-combustible structural system
✔ Long-span floor capabilities
✔ Superior fire resistance
✔ Precision-engineered fabrication
✔ Reduced on-site labor and waste

This is more than a construction site, it’s the future of building in action.

💡 Built with LEFF’s Advanced Hybrid Structural Technology
🔥 Because Old Ways Burn, and we’re redefining how buildings are built.

📍 421 Markham, Toronto
🏗️ Structural System: LEFF Hybrid Floor Technology

📞 647-990-1242
🌐 leff.ca
📩 [email protected]
🔗 .inc

👉 Planning a custom home, townhouse, or multi-unit development?

Contact LEFF today and discover how prefabricated steel systems can reduce construction time, improve quality, and deliver unmatched structural performance.

PrefabConstruction
TorontoConstruction
ProjectProgress
StructuralEngineering
ModernConstruction
CustomHomesToronto
TownhouseConstruction
BuildingInnovation
ConstructionTechnology
FutureOfBuilding
NonCombustible
FireResistant
DesignBuild
ConstructionLife
BuiltWithLEFF

04/10/2026

Dead Load, The Weight That Never Leaves

Every building carries permanent weight, floors, walls, roofs, and finishes.
At LEFF, we engineer that weight to work for you, not against you.

⸻

Why It Matters

✔ Reduced structural weight → smaller foundations & lower excavation costs
✔ CFS framing → up to 50% lighter than traditional concrete systems
✔ Precision tolerances → cleaner finishes, minimal rework
✔ Lower mass → improved performance under seismic conditions

Permanent loads require permanent control.
That’s why LEFF designs every structure with accuracy, efficiency, and long-term performance in mind.

⸻

Less weight. Less cost. Less risk.
More precision. More performance. More confidence.

⸻

💡 Engineered with LEFF’s advanced CFS systems
🔥 Because Old Ways Burn, and smarter structures start here.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Want to see how much foundation volume (and cost) you can save?
DM us or contact LEFF for a quick project comparison.

⸻

LightweightStructure
PrefabConstruction
ModernConstruction
TorontoConstruction
SeismicDesign
CostEfficiency
BuildingInnovation
FutureOfConstruction

04/09/2026

Building the Future, One Floor at a Time

What you see here is more than a concrete pour, it’s precision engineering in action.

LEFF’s prefabricated steel floor systems are designed to simplify construction, reduce on-site complexity, and deliver superior strength and fire resistance for modern mid-rise buildings.

Every stage reflects our commitment to:
✔ Faster construction timelines
✔ Safer, non-combustible structures
✔ Precision-engineered performance
✔ Smarter, more efficient building solutions

This is not just building, this is building smarter with LEFF.

⸻

💡 Advanced Prefabricated Steel Systems
🔥 Because Old Ways Burn, and the future is built with precision.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Planning a mid-rise or custom development?
Contact LEFF today and bring speed, safety, and performance to your next project.

⸻

ModernConstruction
TorontoConstruction
ColdFormedSteel
StructuralEngineering
FireResistant
BuildingInnovation
FutureOfConstruction

03/31/2026

Seismic Load: Ready Before It Happens

In Canada, earthquakes aren’t a “maybe”, they’re a design requirement.

At LEFF, our cold-formed steel systems are engineered with precision, integrating cross-bracing, continuous load paths, and reinforced diaphragms to safely channel seismic forces throughout the structure.

The objective?
Not just to stand, but to perform.

Controlled deformation allows the structure to absorb energy, reduce damage, and prevent collapse, maintaining structural integrity when it matters most.

Lighter. Stronger. Smarter.
Giving architects, builders, and owners the confidence to design without limits.

We design for what may never happen, because when it does, everything depends on what holds.

⸻

📞 Get in touch with LEFF today
Let’s make your next project safer, smarter, and future-ready.

🌐 Website: www.leff.ca
📧 Email: [email protected]
📱 DM us for quick consultation

⸻

SteelFraming ConstructionCanada BuildingSafety ArchitecturalDesign EngineeringExcellence SmartStructures ResilientDesign SeismicLoad ModernConstruction BuildersOfCanada StructuralIntegrity InnovationInConstruction CanadianEngineering FutureReady SafeDesign

03/27/2026

Structural Design That Follows Your Architectural Vision

At LEFF, engineering is not separate from design, it works alongside it. Our team collaborates closely with project architects through multiple review cycles to ensure every structural element aligns precisely with the architectural intent and performance requirements.

We use non-combustible, particle-board-free materials, delivering superior safety, durability, and quality. All designs comply with the Ontario Building Code (OBC) and the National Building Code of Canada (NBC), and are delivered as a complete engineering package ready for City Permit submission.

⸻

Designed for Canada’s Climate

Wind Resistance
Structures are engineered to withstand powerful wind forces through optimized bracing, moment frames, and diaphragm systems. Cold-Formed Steel (CFS) provides exceptional stiffness-to-weight performance for stability without excess mass.

Snow Load Performance
Our roof systems are designed for heavy Canadian winters. CFS framing resists deformation under significant snow loads and remains dimensionally stable through repeated freeze-thaw cycles, unlike traditional wood systems.

⸻

Precision engineering. Code-compliant design. Built to perform for decades.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Architects, builders, and developers; contact LEFF to learn how our engineered steel systems can support your next project from concept to permit to construction.

TorontoConstruction
BuildingCode
OBC
NBC
ArchitecturalDesign
CustomHomes
PrefabConstruction
BuildingInnovation
FutureOfConstruction

03/25/2026

Engineered Strength at the Core of 210 Glenayr

At the heart of 210 Glenayr lies a sophisticated hybrid structural system that combines reinforced concrete with Cold-Formed Steel framing, delivering exceptional durability, fire resistance, and long-term performance.

This advanced approach enables:

✔ Large open spans without structural compromise
✔ Minimal interior columns for flexible layouts
✔ Clean architectural lines and modern aesthetics
✔ Seamless spatial flow with expansive glazing

The result is a residence designed not only for beauty, but for strength, safety, and longevity, where engineering excellence supports architectural vision.

Precision structure. Elevated living. Built by LEFF.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Planning a custom home or development? Contact LEFF to explore how our hybrid structural systems can transform your project.

ModernArchitecture
CustomHomes
LuxuryHomes
TorontoConstruction
StructuralEngineering
BuildingInnovation
FutureOfConstruction

03/19/2026

Installation, Assembled, Not Built

At LEFF, construction doesn’t begin on site, it arrives ready. Every structural component is precision-engineered and prefabricated, transforming installation into a seamless assembly process rather than unpredictable field work.

✔ Fully prefabricated wall, floor & roof panels
✔ Labeled components with clear installation sequence
✔ No welding, trimming, or on-site guesswork
✔ Faster timelines with reduced labor requirements
✔ Consistent quality across every project

For architects, this means designs are executed exactly as envisioned.
For builders, it means speed, efficiency, and reliability without compromise.

By integrating engineering, manufacturing, and installation into one continuous system, LEFF delivers structures that are not only faster to build, but smarter, safer, and more precise.

Build smarter. Build faster. Build with confidence.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Contact LEFF today to discover how prefabricated steel systems can accelerate your next project.

ModernConstruction
OffsiteConstruction
ModularBuilding
ConstructionInnovation
TorontoConstruction
CustomHomes
BuildingTechnology
FutureOfConstruction

03/16/2026

How Do LEFF Systems Empower Architects?

At LEFF, structural innovation meets architectural freedom. Our advanced hybrid framing systems remove traditional limitations — allowing designers to create bold, open, and future-ready spaces.

✔ Long Spans — Up to 11 m (36 ft) with no intermediate supports
✔ Extended Cantilevers — Push boundaries with dramatic overhangs
✔ Large Openings — Perfect for expansive glazing and modern façades
✔ Tailored Concrete Flooring — Premium finished slab or standard subfloor options
✔ No Interior Load-Bearing Walls — Maximum flexibility for space planning

The result? Cleaner lines, open layouts, and architecture that truly reflects your vision — without structural compromise.

Design without limits. Build with LEFF.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Architects, builders, and developers — contact LEFF today to discover how our systems can transform your next project.

ModernArchitecture
PrefabConstruction
StructuralEngineering
TorontoConstruction
CustomHomes
DesignFreedom
BuildingInnovation
FutureOfConstruction

03/13/2026

Smart Structural Design, Built for Efficiency

Engineered for modern construction, our system is designed to simplify installation, coordination, and long-term performance.

✔ Framing layout at 24” or 48” spacing
✔ Easy routing for all mechanical, electrical & plumbing utilities
✔ Ideal for houses and townhomes
✔ Fully compatible with prefabricated panelization

The result? Faster construction, cleaner ex*****on, and precision you can rely on, from factory to job site.

Build smarter. Build faster. Build with LEFF.

📍 Toronto | GTA
📞 647-990-1242
🌐 www.leff.ca
📩 [email protected]

👉 Contact us today to learn how our advanced prefabricated systems can accelerate your next project.

ModernConstruction
TorontoConstruction
CustomHomes
TownhomeConstruction
BuildingInnovation
ConstructionTechnology
FutureOfConstruction

Address

1594 QUEEN Street EAST
Toronto, ON
M4L1G2

Opening Hours

Monday	8am - 5pm
Tuesday	8am - 5pm
Wednesday	8am - 5pm
Thursday	8am - 5pm
Friday	8am - 5pm
Saturday	9am - 1pm

Telephone

+16479901242

Website

http://WWW.LEFF.CA/

Alerts

Be the first to know and let us send you an email when LEFF posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Want your business to be the top-listed Engineering Company in Toronto?