The Short Answer
In the curtain wall manufacturer vs contractor question, the difference comes down to responsibility. A manufacturer or system supplier develops or supplies framing systems and components, which may include extrusions, gaskets, anchors and tested details. A fabricator cuts, machines, and assembles those components into frames or units for a specific building. A glazing contractor may hold the facade subcontract and coordinate site installation, sometimes using specialist subcontractors. Facade consultants and testing labs support the process but do not build the wall.
On many Canadian projects, one company performs two or all three roles. Knowing which roles a firm actually covers helps you write a better request for quotation (RFQ) and avoid scope gaps.
Who Does What on a Curtain Wall Project
Manufacturer / System Supplier
Develops proprietary systems, publishes test data and shop-detail libraries, and supplies materials. Most suppliers don’t install.
Fabricator
Turns stock material into project-specific frames or glazed units in a controlled shop, following approved shop drawings.
Glazing Contractor / Installer
Manages submittals, site logistics, hoisting, installation, sealing, and warranty. This is usually the firm the general contractor hires.
Facade Design Consultant
Advises the owner or architect on performance criteria and specifications, then reviews submittals and site work.
Testing Lab
Runs mock-up and field tests, such as air and water performance checks. Labs verify results independently and are not part of production.
For background on how these systems are expected to perform, CMHC’s best practice guide on glass and metal curtain walls is still a useful Canadian reference. Ontario’s Architectural Glass and Metal Contractors Association also outlines typical project types its members handle.
Stick-Built vs Unitized: Why It Changes the Roles
The system type affects who does the most work and where that work happens. The comparison below is general guidance. The right choice for a specific building should be confirmed by its design team.
AGMCA announced a pre-glazed curtain wall demonstration as part of its October 14, 2026 Glazier Expo. The planned demonstration illustrates the link between shop fabrication, installation methods and trades training.
How to Choose a Provider and Scope Your RFQ
Match the firm to the job
- Owners and general contractors usually need a glazing contractor that carries installation and warranty responsibility.
- Glazing contractors may source from a system supplier, an independent fabricator, or both.
- Edge case: on recladding or retrofit work, ask whether the firm has handled existing-building surveys and phased occupancy.
Define the RFQ scope clearly
- Specify whether the system is stick-built, unitized, or open to proposals.
- State who provides engineering, shop drawings, and performance mock-ups.
- Assign responsibility for testing lab fees and field testing.
- Spell out interfaces with adjacent trades, including air barriers, roofing, and slab edges.
- List the warranty terms, schedule milestones, and site access limits.
Our guide to preparing a facade project inquiry walks through the documents to gather first. You can also browse the growing curtainwall.ca directory to find Canadian firms by role. If you supply, fabricate, or install curtain wall, you can list your business.
Summary
Manufacturers design and supply systems, fabricators build project-specific components, and glazing contractors install the wall and stand behind it. Consultants and labs keep the work accountable. Before you request pricing, decide which roles you need and put that scope in writing.