Guides · Updated July 24, 2026
Buy American rules for construction materials
Domestic-content rules are where a well-priced public bid quietly turns into a losing job. There are two different regimes with different thresholds, they attach to different kinds of funding, and both push the documentation burden down onto the trades that actually buy the material. Knowing which one you're under, before you price, is the whole game.
Two regimes, and knowing which one you're under
The Buy American Act, implemented through FAR Subpart 25.2, applies to direct federal procurement — the government contracting to build or repair a public building or public work. Build America, Buy America (BABA), implemented through 2 CFR part 184 and agency rules, applies to infrastructure projects funded by federal financial assistance: grants and loans flowing to states, cities, transit agencies, and utilities. Same instinct, different statutes, different numbers.
That distinction is why the question "do Buy American rules apply?" has no general answer. A city water-main job may carry BABA because it is funded by a federal grant, while carrying no FAR clauses at all. A base building renovation carries the FAR clauses and not BABA. The answer is in the funding, and therefore in the solicitation — which is where you should look first, not last.
| Question | FAR Buy American (Subpart 25.2) | BABA (2 CFR 184) |
|---|---|---|
| Applies to | Direct federal construction contracts | Infrastructure funded by federal financial assistance |
| Typical buyer | USACE, NAVFAC, VA, GSA | State DOT, city, transit authority, water utility |
| Iron and steel | Foreign iron and steel under 5% of component cost | Produced in the United States, all manufacturing processes domestic |
| Manufactured products | Domestic content threshold on components (65%, rising to 75%) | Manufactured in the U.S. with domestic components over 55% of component cost |
| Construction materials | Covered as construction material | Separate category with its own all-processes-domestic standard |
| Relief | Nonavailability, unreasonable cost, public interest exceptions | Agency waivers: nonavailability, public interest, over-25% cost increase |
Buy American on direct federal contracts
On a direct federal construction contract, domestic construction material has to clear two hurdles: the article must be manufactured in the United States, and the cost of its domestic components has to exceed a stated percentage of the total component cost. That percentage has been climbing on a published schedule — 60% historically, 65% for items delivered in the 2024 through 2028 window, and 75% for items delivered in 2029 and after. Iron and steel construction material is treated separately: foreign iron and steel must be under 5% of the cost of all components.
The enforcement mechanism at bid time is a price penalty rather than a flat prohibition. Where an offer proposes foreign construction material without an approved exception, the evaluation adds a percentage to the offered price — 20% under the standard rule, with larger factors in some circumstances — which in a low-bid construction competition is functionally disqualifying.
BABA on federally funded infrastructure
BABA reaches far more contractors than the FAR rules do, because it rides on grant money rather than federal contracts. The statutory requirement is that none of the funds made available for a federal financial assistance program for infrastructure may be obligated for a project unless all of the iron, steel, manufactured products, and construction materials used in the project are produced in the United States.
Those are three distinct categories with three distinct tests. Iron and steel must be produced in the United States with all manufacturing processes occurring domestically. A manufactured product qualifies when it was manufactured in the United States and the cost of its domestic components is greater than 55% of the total cost of all components. Construction materials — the category that captures things like drywall, lumber, glass, and non-ferrous metals — have their own standard requiring all manufacturing processes to occur domestically.
The practical consequence for a specialty sub is that BABA compliance is a supply-chain question you have to answer in writing. Your general contractor will push certification down to you, and "my supplier said it's American" is not documentation. Ask for manufacturer certifications and mill certificates at quote time, before your price is locked.
Waivers exist, but they aren't yours to assume
Both regimes have escape valves. Under BABA an agency may waive the preference on three grounds: that applying it would be inconsistent with the public interest, that the materials are not produced in the United States in sufficient and reasonably available quantities or of satisfactory quality, or that using domestic material would increase the overall project cost by more than 25%. The FAR exceptions track the same logic — nonavailability, unreasonable cost, and public interest.
The critical point is procedural: waivers are granted to the project by the agency, generally with public notice and comment, not claimed unilaterally by a contractor at submittal time. If a required item genuinely has no domestic source, raise it during the question period so the agency can address it — after award, an unwaived foreign item is your problem, and the remedies are all expensive.
What this means for your price and your submittals
Treat domestic content as a pricing input, not a submittal formality. Three habits cover most of the exposure. First, read the clause list and the special provisions before you price — the solicitation tells you which regime applies. Second, get written domestic-content certification from suppliers at quote stage, and hold the quote and the certification together. Third, price the compliant material, not the cheapest material, and say so in your proposal; a bid built on an import that can't be certified is a change order you'll lose.
Escalation compounds this. Domestic-source constraints narrow your supplier options exactly when prices are moving, which is a good reason to read pricing public bids in a volatile market alongside this. And because the rules attach to funding, federally assisted state and local work is where most contractors meet BABA first — see how the state and local market works.
Thresholds and rules here reflect the regulations as of July 2026 and are stated for orientation, not reliance. Your solicitation's own clauses control, and agency-specific Buy America rules — the Federal Highway Administration's in particular — can be stricter than the general standards.
Frequently asked questions
- What is the difference between the Buy American Act and Build America, Buy America?
- The Buy American Act, implemented in FAR Subpart 25.2, applies to direct federal procurement — contracts the government itself awards. Build America, Buy America applies to infrastructure projects funded by federal financial assistance, such as grants to a state DOT, city, or water utility. Which one governs your job depends on how the project is funded, not on the type of work.
- What percentage of a product must be American-made?
- Under BABA, a manufactured product must be manufactured in the United States with domestic components greater than 55% of the total cost of all components. Under FAR Subpart 25.2, domestic construction material must be manufactured in the U.S. with domestic content above 65% for items delivered from 2024 through 2028, rising to 75% for 2029 and later.
- Can a contractor get a Buy America waiver?
- Waivers are issued by the funding agency for a project, not claimed by a contractor at submittal. The three BABA grounds are inconsistency with the public interest, domestic material not being available in sufficient and reasonably available quantities or satisfactory quality, and a cost increase to the overall project of more than 25%. Raise a genuine sourcing problem during the question period, before award.
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