The US Trade War and Canadian Housing: How Tariffs Reach Your Mortgage, Your Builder, and Your City

The US Trade War and Canadian Housing: How Tariffs Reach Your Mortgage, Your Builder, and Your City

Short answer: tariffs do not tax houses. They tax the things houses are made of, the paycheques that qualify buyers for mortgages, and the confidence that makes a buyer sign. As of October 2026 the measures in force include a 10 percent US baseline tariff on Canadian goods that do not qualify under CUSMA, 50 percent on steel and aluminum, a combined 45.16 percent on softwood lumber, a Canada-only 50 percent tariff on $27.6 billion of goods imposed August 22, and Canadian counter-tariffs of 15 to 50 percent on $27.6 billion of US goods imposed September 8. The housing effects are already visible in the data: national home sales fell 2.3 percent in September 2026, the MLS Home Price Index is down 3.4 percent year over year, builders' costs for metal inputs are up 8 to 13 percent since late 2024, and the construction council in Ontario estimates the September counter-tariffs alone add $9,000 to $14,000 to a typical new detached home. The five sections below map the channels. Four companion pieces work each one in depth.

This is education only, not financial advice. Tariff measures change by proclamation and court ruling, sometimes within a week. Every rate in this guide is stated as in force on October 18, 2026, from the government and court sources named in the text.

The state of the dispute, as of October 18, 2026

Start with what is actually law, because the 2025 version of this story is out of date. The original US tariff on Canada, imposed under emergency powers (IEEPA) in March 2025 and raised to 35 percent that August, was struck down by the US Supreme Court on February 20, 2026, in Learning Resources, Inc. v. Trump. US Customs stopped collecting it on February 24. What replaced it is a stack of narrower, harder measures:

Measure	In force on October 18, 2026	In force since
US baseline tariff on Canadian goods that do not qualify under CUSMA (Section 301)	10%	July 24, 2026
CUSMA-compliant goods	Exempt from the baseline tariff	-
Steel and aluminum, core products (Section 232)	50%; CUSMA products taxed on their non-US content, with a 15% minimum effective rate	June 4, 2025; restructured April and June 2026
Autos (Section 232)	25%, applied to the non-US content of CUSMA-qualifying vehicles; CUSMA-compliant parts still exempt	April 3, 2025
Softwood lumber	10% Section 232 tariff plus 35.16% in anti-dumping and countervailing duties: 45.16% combined	October 14, 2025
Section 338 tariff (Canada only)	50% on $27.6 billion of goods, no CUSMA exemption; outright import bans on 68 product lines from September 29	August 22, 2026
Energy and potash	Excluded from the Section 338 tariff; no separate energy rate in force	-
Canada's counter-tariffs (United States Surtax Order, 2026)	15%, 25% or 50% by product, on $27.6 billion of US goods, 648 tariff items	September 8, 2026
Canada's auto counter-tariff	25% on US vehicles, unchanged	April 9, 2025

Four more dated facts frame everything that follows. First, lumber gets partial relief within days: on October 14 and 15, 2026 the US Commerce Department finalized a review cutting the duty portion on softwood lumber from 35.16 percent to 24.75 percent, which takes the combined rate to 34.75 percent when it takes effect on Federal Register publication, scheduled for October 19. Second, the Section 232 rates on upholstered furniture (25 percent) and kitchen cabinets (25 percent) are scheduled to rise on January 1, 2027, to 30 and 50 percent. Third, the US president said on August 24, 2026 that cars, trucks, auto parts and steel would go to 50 percent on January 1, 2027. No proclamation or executive order doing that had been issued by mid-October. It is an announcement, not a law, and this series treats it that way. Fourth, CUSMA itself survived its first six-year review on July 1, 2026 without an extension: the agreement stays in force until 2036, but the three countries now review it every year instead of once.

The exposure underneath these numbers is large. Statistics Canada figures published in Global Affairs Canada's State of Trade 2026 show 71.7 percent of Canadian merchandise exports went to the United States in 2025, including $92 billion of motor vehicles and parts and $45 billion of forestry products. That is why a tariff fight is also a housing story.

How the stack replaced itself: a short timeline

March 2025: the US imposes the emergency tariff (25 percent on Canada, 10 percent on energy and potash, CUSMA goods exempted days later). Steel and aluminum follow at 25 percent on March 12, autos at 25 percent on April 3. Canada answers with surtaxes on $30 billion, then steel, aluminum and a $29.8 billion list, and a 25 percent auto surtax on April 9.

June 2025: US steel and aluminum double to 50 percent.

September 2025: Canada repeals its broad consumer-goods surtaxes (the March lists), keeping steel, aluminum and autos, in recognition of tariff-free CUSMA trade at that time. The threatened second Canadian phase, a $125 billion list, is never enacted.

October 2025: the US adds a 10 percent Section 232 tariff on softwood lumber, on top of existing duties, and 25 percent on cabinets and upholstered furniture. The Bank of Canada makes its last move of the cycle, cutting to 2.25 percent on October 29.

February 2026: the US Supreme Court strikes the emergency tariffs down. A temporary 10 percent global surcharge replaces them for non-CUSMA goods; it expires by statute on July 24, 2026.

July 2026: CUSMA's six-year review ends without an extension (annual reviews from here). On July 24, a 10 percent Section 301 tariff on non-CUSMA goods takes the expired surcharge's place.

August and September 2026: the current round. Talks collapse August 21; the Section 338 tariff lands August 22 at 50 percent on $27.6 billion of Canadian goods; Canada matches dollar for dollar on September 8 with surtaxes on $27.6 billion of US goods; the Section 338 scope widens September 15; bans on 68 product lines follow September 29. September's jobs report, the first full month of the new round, shows employment down 68,300.

Two lessons from the sequence. Every measure in the current stack sits on a different legal basis from the one the Supreme Court removed, which is why "the courts ended the tariffs" is nine months out of date. And the direction since July has been escalation by replacement: each expiring measure has been succeeded by a narrower, harder one.

Channel 1: the builder's invoice

A Canadian home is built from a supply chain that crosses the border in both directions, so it gets taxed twice. US tariffs raise the price of Canadian steel, aluminum and lumber inside the US market and squeeze the mills and plants that supply builders on both sides. Canada's counter-tariffs then tax the US-made inputs Canadian builders import: structural steel and rebar, wiring, gypsum board, appliances, heat pumps, cabinet hardware.

The cost data is already moving. CMHC's analysis of Statistics Canada's Building Construction Price Indexes, published September 24, 2026, shows that from the fourth quarter of 2024 to the second quarter of 2026, in the 15 largest metros, the utilities division of construction costs rose 15 percent, plumbing 14 percent, HVAC 13 percent, metal fabrications 13 percent and structural steel framing 8 percent. Wood, plastics and composites were flat over the same period, because the lumber tariff falls on exports to the US, not on wood sold inside Canada. Residential construction costs overall rose 0.5 percent in the second quarter of 2026 and 2.3 percent year over year.

The dollar translation comes from the Residential Construction Council of Ontario (RESCON), in a report covered in early October 2026: the September 8 counter-tariffs add an estimated $9,000 to $14,000 to a typical single-detached home in Ontario and $18,000 to $28,000 to a mid-rise unit, on top of $15,000 to $25,000 per home that the council attributes to the measures imposed in March 2025. Treat those as an industry council's estimates, not a statistical agency's measurement. The companion piece, what tariffs add to the cost of building a home in Canada, works through lumber, steel, aluminum, gypsum and the presale condo problem input by input.

The squeeze is that builders cannot simply pass these costs on. Statistics Canada's New Housing Price Index, which measures the prices builders actually get for new homes, was down 2.03 percent year over year in August 2026. Costs up, selling prices down: the margin between them is where projects get cancelled, and cancelled projects are tomorrow's missing supply.

Channel 2: the Bank of Canada's bind

Tariffs push the Bank of Canada in two directions at once. They raise prices (Canada's counter-tariffs tax imports directly, and a weaker dollar makes everything imported cost more), which argues for higher rates. They also destroy demand in exposed industries, which argues for lower rates. The Bank has chosen to sit still: the policy rate has been 2.25 percent since October 2025, held for the seventh straight meeting on September 2, 2026, in a statement that said upside risks to inflation had increased and trade uncertainty had deepened. Our September 2026 decision piece covers that statement in full.

For mortgage holders, the channel that bites first is not the policy rate at all. Fixed mortgage rates follow Government of Canada bond yields, and bond markets price the fight in real time. CREA's September 2026 release, published October 16, blamed part of that month's sales drop on a jump in fixed mortgage rates and noted the Bank is widely expected to raise its rate before year-end. Variable-rate holders wait on the Bank itself, next decision October 28, 2026. Owners renewing a 2021 five-year term this fall face all of it at once: the renewal wall meets the trade war. Tariffs, the Bank of Canada and your mortgage rate works through the rate paths, the renewal math and the stress test, with scenarios labelled as scenarios. Our existing explainer on how mortgage rates are set in Canada covers the bond-market mechanics underneath.

Channel 3: the paycheque

Housing demand is employment with a lag. A buyer who loses a factory job does not miss a mortgage payment the same month; they stop shopping for a house immediately and become a delinquency statistic quarters later if the job does not come back.

September 2026 was the first full month with the Section 338 tariff in force, and the Labour Force Survey showed employment down 68,300 in the month, with unemployment at 6.5 percent. Manufacturing lost 12,700 jobs in September and sits roughly 40,000 jobs below its January 2025 peak, before the first US tariffs. Ontario's own tariff-response plan counts 285,000 jobs, 3.5 percent of provincial employment, as linked to exports to the US. The Financial Accountability Office of Ontario modelled the tariff scenario at 119,200 fewer Ontario jobs in 2026 than a no-tariff path, with manufacturing taking 57,700 of the losses. That is a scenario from 2025, not a result, and it is labelled that way wherever this series uses it.

Rent shows the local damage early, because renters move faster than owners. Rentals.ca and Urbanation's September 2026 analysis found asking rents in the ten most tariff-exposed markets had fallen nearly four times faster than in the ten least exposed since January 2025, with Oshawa asking rents down 10.8 percent in a year. Nationally, average asking rent was $2,034 in September, down 4.2 percent year over year, the twenty-fourth straight annual decline.

Channel 4: the map

The national averages hide the split. The same September CREA release that showed the price index down 3.4 percent year over year noted the decline was driven by Ontario, partly offset by gains on the Prairies, in Quebec and on the East Coast. Exposure explains much of the divergence. Ontario holds the auto and steel belt: Windsor, Hamilton, Oshawa and the GTA supply chain. British Columbia holds the lumber exposure: Canadian softwood production fell 6.7 percent year over year in July 2026, and the US takes the overwhelming share of BC lumber exports. Alberta is the exception that proves the rule: energy is excluded from the Section 338 tariff, the Alberta government estimates more than 90 percent of the province's goods exports to the US remain CUSMA-compliant and tariff-free, and ATB Financial puts Alberta's exposure to the August round at roughly $1.5 billion, about 1 percent of its merchandise exports to the US. The trade war's regional map takes each market in turn, with its own numbers.

Who actually pays a tariff (the 60-second version)

One mechanic explains most of the channels above: a tariff is collected from the importer at the border, in cash, before the goods move. When the US charges 50 percent on Canadian steel, an American buyer pays US customs; the Canadian mill feels it as lost orders, lower volumes and pressure to cut its price to stay competitive, which is how a tax collected in Ohio becomes a payroll decision in Hamilton. When Canada charges 25 percent on US bathroom fixtures, the Canadian distributor pays Ottawa at the border and recovers it in the price list, which is how a Canadian countermeasure becomes a line in a Canadian builder's quote. Neither government mails the other a cheque. The economic burden lands on some mix of the exporter's margins, the importer's customers and the workers in the exposed plant, and the mix is what the five channels distribute through the housing market.

Channel 5: confidence and the dollar

There is also a second front that rarely makes the housing pages: procurement. On September 8, 2026, alongside the Section 338 measures, a presidential direction ordered Canadian companies removed from the US federal supply chain, and a September 16 procurement memorandum set the exclusion machinery in motion; defence contracts are excluded, and no dollar figure for Canadian firms' federal contract values appears in the official texts this series read (a trade law firm summary cites a US federal spending programme of more than $50 billion a year, which is the programme's size, not Canada's share of it). Procurement exclusion does not move a housing index directly. It is a confidence marker: it tells Canadian firms the dispute has spread from goods at the border to their eligibility to bid at all, and firms that cannot see their order books defer the hiring and the relocation demand that feed housing in the cities where they sit.

The softest channel may be the largest in the short run. CREA cut its 2026 sales forecast for the third straight quarter on October 16, to 444,530 transactions, down 5.2 percent from 2025, even though September's 4.9 months of inventory is close to the long-term average and the sales-to-new-listings ratio, at 48.8 percent, sits inside CREA's balanced range. The market is not drowning in listings. Buyers are waiting, and trade headlines are a stated reason: TRREB's September release reported GTA sales down 9 percent year over year under the heading of economic uncertainty.

The dollar compounds the material channel. Tariff escalation tends to push the Canadian dollar down, and a lower dollar raises the Canadian-dollar price of every US-made input a builder or renovator buys, whether or not that input is itself on a surtax list. It also raises the price of imported consumer goods, which feeds the inflation side of the Bank of Canada's bind in Channel 2. A negotiated settlement would be expected to run the same machinery in reverse, which is why the dollar belongs on the watch list in the final piece of this series.

What the data shows so far

Through September 2026, the scoreboard reads like this. Sales: down, with national MLS sales off 2.3 percent in September and 7.7 percent below September 2025. Prices: the national composite MLS HPI down 0.4 percent in September and 3.4 percent year over year; the national average sale price was $666,538. New construction: housing starts ran at a seasonally adjusted annual rate of 248,896 in September, but actual starts for the first nine months of 2026 are 4 percent below 2025, and CMHC's deputy chief economist noted that of the four most populous provinces only Quebec has gained starts this year. Presales: the City of Toronto started 156 condominium units in the first half of 2026, against a decade average near 7,000 a year, and Urbanation recorded zero new Toronto condo launches in that half, a first in its records. Jobs: down 41,200 in 2026 to date, against a gain of 211,300 in the same months of 2025.

None of that is solely the trade war's doing. Interest rates, the 2025 price correction, slower population growth and local supply all push on the same numbers. The trade war's contribution runs through the five channels above, and the rest of this series takes them one at a time:

• What the tariff stack adds to the cost of building a home: lumber, steel, aluminum, gypsum, and why new-build and resale prices are moving in opposite directions.
• Tariffs, the Bank of Canada and your mortgage: the hike-versus-cut bind, bond yields and fixed rates, variable holders, the renewal wall and the stress test.
• One trade war, five housing markets: the Ontario manufacturing belt, BC lumber towns, Alberta energy, Quebec and the Atlantic.
• Escalation, stalemate or a deal: three scenarios for 2027, each with the dated indicators that would confirm it.