Full-Cycle Experience
Design, Fabricate, Install & Repeat
A shop built around architectural detail, material honesty, and the focused work of making things last.
HVAC Custom Fabrication & Installation
Building Ventilation Systems, Custom ductwork, plenums, and fittings fabricated to spec. Engineered airflow delivered on schedule.
Metal Roofing & Siding
Standing-seam roofing, architectural panels, and flashing. Rolled, folded, and finished in-house.
Welding & Fabrication
Structural and precision welding. MIG, TIG, and stick for shops, sites, and specialty assemblies.
HVAC Custom Fabrication & Installation
Building Ventilation Systems, Custom ductwork, plenums, and fittings fabricated to spec. Engineered airflow delivered on schedule.
Metal Roofing & Siding
Standing-seam roofing, architectural panels, and flashing. Rolled, folded, and finished in-house.
Welding & Fabrication
Structural and precision welding. MIG, TIG, and stick for shops, sites, and specialty assemblies.
What Drives Us
Our Core Values
Quality
CWB-certified craftsmanship held to the highest standards on every project.
Customer Satisfaction
We listen, communicate, and go the extra mile to exceed expectations.
Stability
37 years of consistent, reliable service — a partner you can count on.
Safety
Zero-compromise safety culture protecting our team, your site, and the public.
One Shop, Full Cycle
Every stage under one roof
- Design & PlanningDrawings, specs, engineering
- FabricatingCutting, welding, forming
- FinishingCoating, polish, QA
- TransportingDelivery to site
- InstallingOn-site install crews
- RepeatCycle refined every job
O’Brien Fabrications works in…
Commercial Buildings & Property Managers
For commercial roofing/siding, metal repairs, HVAC sheet metal, tenant improvements, service work, and building upgrades.
More details about Commercial BuildingsWhy O’Brien
Built for Customers Who Need It Done Right
37 Years Strong
From a one-man shop to a full-cycle fabrication team trusted across Southern Ontario.
Quality Without Shortcuts
Every weld, seam, and fold is inspected before it leaves the shop. No rework, no callbacks, no surprises on site.
On-Time, Every Time
In-house control of every stage means we set timelines we can keep... and we keep them.
One Shop Does It All
Design through install under one roof eliminates coordination gaps between trades.
Trusted by Repeat Clients
37 years of relationships with contractors, engineers, property managers, facility coordinators, and more.
What Our Clients Say
Get In Touch
Send Us a Message
Tell us about your project and we’ll get back to you within one business day.