Questions about 2026 U.S.-Canada building material tariffs are adding another variable to new-construction pricing. But recent federal changes covering metal, lumber, cabinets, and some HVAC products do not produce one standard surcharge for every home — or even every product imported from Canada.
A project’s exposure depends on the product’s tariff classification, country of origin, share of U.S. content, import date, and the builder’s purchasing arrangements. Whether a buyer ultimately pays more is a separate question governed by the builder’s pricing decisions and the purchase contract.
For real estate agents, that makes current price sheets, procurement details, allowances, and escalation clauses more useful than a national tariff estimate.
Metal tariff rules changed twice in 2026
An April 2026 White House proclamation changed how Section 232 duties apply to specified aluminum, steel, copper, and derivative products. Effective April 6, the applicable duty is calculated on a covered product’s full customs value, not just its metal content.
The proclamation established several product-specific treatments: 50% for articles listed in one annex, 25% for certain articles in another, and 10% for qualifying derivatives meeting U.S.-origin metal requirements. The applicable rate depends on the tariff code and the conditions in the proclamation—not simply whether a product contains metal.
A June 2026 proclamation added another list of aluminum and steel products subject to a 25% duty through Dec. 31, 2027. For goods on that list that qualify as products of Canada or Mexico under the United States-Mexico-Canada Agreement, the 25% duty generally applies only to non-U.S. content, subject to a 15% minimum total effective duty.
The June action also extended temporary 15% treatment to specified products, including certain predominantly residential HVAC systems and components. Those provisions apply only to listed products that meet the relevant requirements; they are not blanket rates for all Canadian materials.
Lumber and cabinets follow a separate schedule
Wood products are covered by a different federal action. Certain softwood timber and lumber became subject to a 10% tariff, while certain kitchen cabinets and vanities received a 25% rate. A planned increase to 50% for covered cabinets and vanities was postponed until Jan. 1, 2027, subject to any applicable trade agreements or later policy changes.
These are product-based measures, not a single Canada-only building-material tariff. Canadian softwood lumber can also be subject to separate antidumping and countervailing duties, further complicating any attempt to calculate a home’s exposure from a headline rate.
A Brookings analysis estimated that the tariff policies then in effect would add roughly $30 billion to residential-structure investment costs, with about 90% attributable to new homes and apartments. The model predates the 2026 metal changes and does not provide a current cost for an individual home.
The builder contract determines buyer exposure
Tariffs are assessed on imported goods, but a builder may absorb costs, change suppliers, substitute products, revise an allowance, or pass through some costs when the contract permits. A new tariff does not by itself establish a builder’s right to reprice a signed agreement.
Before buyers rely on an advertised base price, agents should request:
- The dated price sheet and written confirmation of how long the price remains valid.
- The purchase agreement’s escalation, substitution, allowance, and change-order provisions.
- Written clarification on whether major cabinet, HVAC, and metal packages are ordered, in inventory, or still subject to vendor pricing.
- Current upgrade and allowance schedules, compared with the versions supplied when the buyer began shopping.
Agents should send contract interpretation to the buyer’s attorney under applicable brokerage policy. Product classification and USMCA eligibility should be confirmed by the builder, importer, or a qualified customs professional. The agent’s role is to surface the questions early and document the answers before a buyer makes a pricing decision.