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Building

general contractors and building specialists

Built by engineers, trusted by owners and consultants to construct, restore, protect, and improve real estate assets.

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Construction Framework Structure

building lasting real estate value

A-1 Constructors is a technically driven general contractor specializing in building restoration, construction, and asset management. We work alongside owners, consultants, and asset managers to deliver projects that strengthen building performance and support long-term property value.


Our team brings together engineering knowledge, construction expertise, and real-world ownership experience to solve complex building challenges. We understand how buildings function, how projects succeed, and the importance of effective communication throughout the process.


We are more than builders. We are partners who help our clients make informed decisions and deliver successful outcomes.

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Building Under Construction

comprehensive building services

Our team provides new construction, repair and rehabilitation services across a wide range of building systems. By understanding how these systems interact, we help clients address issues holistically rather than in isolation.

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ENV

envelope

Renewal, repair, over-cladding and replacement of elements that protect buildings from weather, control moisture, improve energy performance, and preserve long-term durability.

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Modern apartment building with balconies under a blue sky.

FEN

fenestration

Replacement, restoration, re-glazing and improvement of windows, curtain walls, storefronts, skylights, door systems, and glazing assemblies.

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Low angle of a concrete office building with glass facade

FND

foundation

Foundation repairs, below-grade waterproofing, underground utility repairs, excavation, retaining walls and structural stabilization.

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Worker by fresh asphalt and Genie lift at a construction site

GAR

garage

Rehabilitation and restoration of parking structures, including concrete repairs, waterproofing systems, expansion joints, ramps, and structural repairs.

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Polished gray concrete floor in an empty parking garage.

RF

roofing

Roof replacement, restoration, maintenance, waterproofing, drainage improvements, and specialized roofing assemblies.

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Commercial flat roof under construction with white membrane

STR

structure

Repair, restoration, reinforcement, and protection of structural components that support building safety and performance.

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Steel shoring jacks supporting a concrete ceiling
Modern Building Facade

27

Years of Combined Experience as Contractors

9

Years of Combined Experience Representing Building Owners

32

Years of Combined Experience as Consulting Engineers

why choose A-1 Constructors

  • Built by engineers for engineers: Our team combines technical knowledge and practical construction experience to understand projects from design and fundamental concepts to execution and contracting.​

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  • Strong communicators: We aim to be responsive and provide clear information, timely updates, and collaborative project management that helps owners, consultants, and project teams stay aligned.

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  • Broad building system expertise: Our experience spans all major building systems, allowing us to consider how each component affects overall building performance.

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  • Focused on long-term value: Every recommendation and project decision is guided by what creates lasting value for the building, its occupants, and its owners. We do things that make sense.

our work in motion

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Building Exterior

Robinson

envelope

Niagara Region

Building Exterior

wonderland

envelope

London

Building Exterior

commissioners

envelope

London

Building Exterior

scottsdale

envelope

Southwestern Ontario

Building Exterior

dufferin

envelope

London

Building Exterior

dalmagarry

structure

London

Building Exterior

huxley

structure

London

Building Exterior

waterloo

fenestration

Southwestern Ontario

Building Exterior

sanford

fenestration

Hamilton

what our clients say

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what our clients say

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Proudly Serving and Completing Projects Across Canada

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serving owners, engineers, and consultants across ontario

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