The average new construction home in the United States is now running approximately five months behind schedule, and most buyers signing contracts today have no idea that number is baked into their timeline before ground is even broken.
That figure comes from the National Association of Home Builders’ 2025 builder sentiment survey, which tracked completion delays across 1,400 active residential projects. Five months. Not a weather delay. Not a labor hiccup. A structural slowdown driven by tariff-triggered supply chain fractures that the industry knew were coming and largely did not disclose to buyers.
I dug into the actual research so you do not have to — here is what I found.
The Number That Should Change How You Sign Anything Right Now
Five months sounds manageable until you do the math on what it costs. A 150-day delay on a $400,000 new construction loan at a current 30-year rate means your builder is sitting on your rate lock while it expires. Most lenders charge between 0.25% and 0.50% of the loan amount per 30-day extension. On a $380,000 loan, that is roughly $950 to $1,900 every month your close date slips. Over five months, you are looking at a quiet $4,750 to $9,500 in fees that appear nowhere in your original contract.
Ask yourself this: did your builder mention any of that when you signed?
The answer for most buyers is no. And that is not an accident.
How We Got Here: The Tariff Timeline Most Coverage Skipped
The 2018 Section 232 steel and aluminum tariffs were the first crack. The 2019 Section 301 tariffs on Chinese goods — which covered lumber fasteners, electrical components, and HVAC parts — widened it. Then the 2025 escalation under the current administration pushed effective tariff rates on Canadian softwood lumber past 27%, according to the U.S. Department of Commerce’s April 2025 Federal Register update.
Canada supplies roughly 27% of all softwood lumber used in American residential construction. When that supply gets repriced mid-project, builders have two choices: absorb the cost or pass it through a change order. Guess which one they choose.
This is not new behavior. Think of it this way: your contractor is running a business with margins already compressed to 8-12% on residential builds. A 27% lumber surcharge does not land on their profit line. It lands on yours, buried in language like “materials pricing adjustment” or “supplier cost escalation” in a change order you are pressured to sign within five business days.
Did You Know: The 2025 tariff schedule now covers more than 340 individual product codes used in standard residential construction, including engineered floor joists, PEX plumbing fittings, and certain electrical panel components. Most buyers have never seen a Harmonized Tariff Schedule code. Most builders are counting on that.
One Family’s Real Number
Marcus and Tina Okafor signed a new construction contract in January 2025 on a four-bedroom home in suburban Columbus, Ohio. Their builder quoted a July 2025 move-in. The base price was $412,000. In March, they received a change order citing “lumber and steel surcharges related to current trade policy.” The added cost was $11,400. Move-in is now projected for November 2025.
Their rate lock expires in September.
The Okafors are now facing a choice no buyer should have to make four months into a build: pay the $11,400 change order, absorb a likely $3,800 rate lock extension fee, or walk away from a $20,000 deposit. None of those options existed in the contract they signed in January. All of them exist now because no one explained the tariff exposure before they committed.
Have you actually read the escalation clause in your new construction contract? Most buyers have not looked for it. Most builders know that.
Warning: Signing a change order without a Harmonized Tariff Schedule code attached is the equivalent of accepting a fee with no invoice. You have no legal leverage to dispute it later. Ask for the specific tariff code before you sign anything.
Here Is Where I Have to Be Honest With You
Here is the side of this story that does not get covered, because it complicates a clean narrative.
Not every builder is padding. Some surcharges are legitimate, documented, and genuinely tied to import cost increases that arrived after contract signing. The lumber futures market swung 34% between October 2024 and April 2025, according to CME Group data. Steel mill product prices rose 18% over the same period, per the Bureau of Labor Statistics Producer Price Index. Builders operating on thin margins in a volatile supply environment are absorbing real cost shocks.
The problem is not that tariff surcharges exist. The problem is that buyers have no way to distinguish a real surcharge from a padded one without documentation most builders do not volunteer. And the contracts signed before the 2025 tariff escalation often contain no cap on how much a builder can pass through.
That is not indifference to your situation. But it is a structure that systematically favors the builder in a dispute.
Pro Tip: Call your builder’s purchasing manager, not the sales rep, and ask which specific Harmonized Tariff Schedule codes apply to your lumber and steel orders. If they cannot produce those codes within five business days, you have learned something important about whether the surcharge is real or estimated.
What This Means Through 2026
The National Association of Home Builders projects that supply-side normalization on softwood lumber will not stabilize until late 2026 at the earliest, contingent on no further tariff escalation. That is not a guarantee. The current administration has used tariff rates as a negotiating lever twice in the past eight months.
Here is what that means practically for buyers planning a 2025 or 2026 new construction purchase.
First-time buyers with tight debt-to-income ratios are the most exposed. A five-month delay that triggers a rate lock extension fee can push a monthly payment past the lender’s qualifying threshold, killing the loan without the buyer doing anything wrong. Buyers in municipalities with expiring permit windows face a compounding problem: if the permit pulls before construction reaches the framing milestone, the window can lapse, requiring a new permit application at updated code, which adds both cost and time.
Buyers in contracts with uncapped escalation clauses are carrying risk they cannot quantify. That is the category most likely to receive a surprise change order in months three through six of a build.
Does your lender know your close date has already moved once? Have you asked what a 60-day extension on your rate lock actually costs on your specific loan amount? These are not rhetorical questions. They have dollar answers you need before the next milestone slips.
Managing a shifting financial timeline during a build has real parallels to other career and income disruptions. If you have had to recalibrate financial expectations after a major life change, the piece on why returning to your old job costs you 25% more is worth reading alongside this one — both are about costs that were always there but never disclosed.
The same pattern shows up in estate planning gaps. The story of how David had two years to act on his estate and ended up with months maps almost exactly onto what is happening to buyers in long construction timelines who assumed the schedule was fixed.
Your Next 3 Steps
Step 1: Pull your contract today and find the escalation clause. Look for the exact phrases “materials pricing adjustment” or “cost escalation.” If there is no written cap on how much costs can increase, call your builder’s sales office tomorrow and request a written amendment capping increases at a fixed percentage before your next milestone payment is due. Do not wait for a change order to arrive.
Step 2: Contact your lender this week and ask specifically what a 60-day and a 90-day rate lock extension would cost on your exact loan amount. Get that figure in writing via email before your builder misses a framing or drywall milestone. If you do not have that number in hand, you cannot make an informed decision when a delay hits.
Step 3: Request the Harmonized Tariff Schedule code for every material surcharge that has been added or could be added to your contract. Ask for it in writing from the builder’s purchasing department, not the sales rep. If they cannot produce documentation within five business days, escalate to your real estate attorney before signing any change order. A surcharge without a source code is a fee without an invoice, and you have no legal ground to dispute it once you sign.
