Canadian Lumber Tariffs Are Still Squeezing US Home Builders

American home builders are still paying a steep premium for Canadian softwood lumber, even after a modest rollback in duty rates this month. Preliminary antidumping and countervailing duty rates fell from a combined 35.2% to 25.9%, but a separate 10% Section 232 tariff remains layered on top, keeping the effective rate on Canadian softwood imports at roughly 35.9%, according to the National Association of Home Builders.

The numbers show up directly on builders' invoices. Weekly framing lumber prices were up 0.2% in mid-July, 4.4% higher than a month earlier and 3.1% above year-ago levels, per Madison's Lumber Price Index. Lumber futures have climbed even faster, up nearly 2.3% in a month and 6.2% over the past year, reflecting persistent uncertainty over how long the current tariff structure will hold.

Because a typical single-family home uses roughly 15,000 board feet of framing lumber alongside thousands of square feet of softwood plywood and OSB, even modest per-unit price increases compound quickly. NAHB estimates that costs incurred during construction ultimately raise the final home price by nearly 15% above a builder's direct cost, once financing, brokerage and margin requirements are factored in.

The trade group has pressed Washington to negotiate a long-term lumber agreement with Canada, expand domestic timber sales on public land, and diversify away from reliance on both Canadian imports and lumber exports to China. None of those fixes are quick, and builders note that even when mill prices fall, relief rarely reaches job sites for weeks or months, while price increases tend to pass through almost immediately.

With affordability already strained by high interest rates and construction labor costs, the lumber dispute adds one more cross-border variable that builders on both sides of the 49th parallel are being forced to price around.