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How US Tariffs on Canadian Imports Impact Contractors: A Practical Guide

Manisha Tiwari 5 min read October 22, 2026
An illustration of a construction site with a crane lifting steel beams, surrounded by flags of the US and Canada, symbo...

US Tariffs on Canadian Imports: What Contractors Need to Know

For years, contractors have relied on Canada as a dependable source for essential building materials like lumber, steel, and aluminum. The close proximity, shared language, and free trade agreements like NAFTA (now replaced by USMCA) made cross-border trade relatively smooth. The assumption was simple: a reliable supply chain and stable pricing.

But then came the tariffs. The US, under different administrations, has repeatedly targeted Canadian imports with tariffs — sometimes up to 50% — on key construction materials. Reuters, March 2023. Lumber prices, for example, spiked dramatically during trade disputes in 2017 and 2018. The recent rounds of trade tariffs have revived those concerns, making it harder for contractors to stick to budgets, win competitive bids, and maintain healthy margins.


What Changed?

The latest round of tariffs on Canadian imports, particularly lumber and steel, has shaken the contractor community. According to the Financial Post, July 2023, these tariffs have increased costs by up to 37% for certain materials, forcing many small and medium-sized contractors to scramble for alternatives.

These tariffs are typically imposed to protect domestic industries from foreign competition or as part of broader geopolitical disputes. However, the construction industry often bears the brunt of these policies because of its reliance on imported raw materials. The ripple effect is undeniable — higher costs for contractors mean higher costs for clients, which in turn can lead to project delays, decreased demand, or even abandoned projects.

The situation is exacerbated by inflationary pressures and supply chain disruptions caused by the COVID-19 pandemic. Even as global markets recover, the addition of tariffs creates volatility in material costs. Contractors must now factor in unpredictable price swings, making accurate project budgeting and cost control more challenging than ever.


Why the Old Belief Persisted

For a long time, the US-Canada trade relationship was stable. Materials flowed smoothly, and pricing was predictable. Contractors operated as if this would continue indefinitely. This assumption was reinforced by the perception that tariffs were political posturing, something temporary that wouldn't really disrupt long-term supply chains.

And there’s the issue of inertia. Once you’ve built relationships with suppliers, switching to new ones is painful. It disrupts everything — approval processes, delivery schedules, trust, and even compliance requirements. Many contractors, especially smaller ones, stuck to their Canadian suppliers, hoping the tariffs would be short-lived. They weren’t.

Another layer of complexity is that contractors often underestimate the depth of impact tariffs can have. Many assume that tariffs only affect the raw material cost. In reality, tariffs influence shipping, customs duties, taxes, and insurance costs, leading to a cascading effect on total project expenses.


What We Do Differently Now

So what’s the move? How do you manage these fluctuating material costs without tanking project profitability?

1. Lock in Rate Contracts Before Projects Begin

One of the smartest moves is negotiating rate contracts for high-volume materials upfront. This isn’t groundbreaking, but it’s shockingly underused. JobNext has a rate contract feature that lets contractors secure pricing for materials like lumber, steel, and cement before mobilization. By locking in prices early, you protect yourself from sudden tariff hikes during project execution. It also ensures your initial estimates align with actual procurement costs, so you don’t end up bleeding money halfway through the job.

How to Implement:

An illustrative example: Imagine you’re managing a residential housing project that requires 1,000 tons of steel. You negotiate a rate contract with your supplier in Canada at $700 per ton, inclusive of potential tariff adjustments. Even if tariffs suddenly increase by 20% mid-project, your costs remain fixed because you’ve locked in the rate.

2. Diversify Your Supplier Base

Relying on a single country for critical materials is risky. The US tariffs on Canadian imports are a stark reminder of this. Diversifying your supplier base to include domestic options or suppliers from countries not affected by tariffs can save you in the long run.

How to Implement:

Comparison: Domestic vs. International Suppliers

Criteria Domestic Suppliers International Suppliers
Tariff Exposure None Varies by country
Shipping Costs Lower Higher
Lead Times Shorter Longer
Price Stability Stable but often higher Fluctuates
Compliance Burden Easier Requires verification

3. Monitor Expiry Dates on Contracts

Tariffs are unpredictable, but rate contracts have fixed expiry dates. If you’re not tracking these dates, you’re leaving money on the table. As tariffs fluctuate, renewing contracts at the right time can make or break your margins.

How to Implement:

4. Understand INCOTERMS and Landed Costs

Tariffs and trade barriers don’t just affect the base price of materials; they influence shipping, insurance, customs, and other costs. Contractors often underestimate the impact of these additional charges.

How to Implement:

5. Use Structured Procurement Workflows

Manual procurement processes often fail to account for hidden costs like tariffs. A structured workflow — from material requisition (MR) to request for quotation (RFQ) to purchase order (PO) — ensures you don’t miss critical details.

How to Implement:


Final Thoughts

If you’re facing rising costs due to tariffs, don’t just accept margin erosion as inevitable. Tools like JobNext can help you negotiate smarter contracts, diversify supplier bases, and manage procurement efficiently. Start your free trial today →

Frequently asked questions

What materials are most affected by US tariffs on Canadian imports?
Lumber, steel, aluminum, and some specialized construction materials have been hit hardest. Tariffs can raise costs by 20-50%, according to Forbes, April 2023.
How do I calculate the impact of tariffs on my project?
Start with the base cost of the material and add the tariff percentage. Don’t forget to include additional costs like shipping, insurance, and customs duties under the applicable INCOTERM.
Can rate contracts protect me from tariff increases?
Yes, if negotiated properly. Locking in prices at the budgeting stage ensures stability even if tariffs spike later. Use tools like JobNext’s rate contract feature to automate this process.
Should I switch to domestic suppliers to avoid tariffs?
Not always. Domestic suppliers can still be more expensive. Evaluate total landed cost — including tariffs, shipping, and compliance — to make an informed decision.
How do I find reliable suppliers outside Canada?
Start with a vendor directory like the one in JobNext. It lets you vet suppliers for compliance, past performance, and technical capability.

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