If certification is one line on your schedule, “FCC/CE/UL”, sitting just before launch, that line is hiding three separate regimes. Each asks a different question, each is signed off by different people, and each has its own way of charging you again if the design moves after testing. The good news: almost all of that second bill is avoidable, and the decisions that avoid it happen months before you book a lab.
Three marks, three different questions
| Mark | The question | Who signs off | Required? |
|---|---|---|---|
| FCC (US) | Does the product’s radio-frequency energy stay inside the limits? | You, by declaration, for most digital devices; a certification body for anything with a radio | Yes, before marketing |
| CE (EU) | Does the product meet every EU directive that applies to it? | Usually you, by self-declaration; a notified body in some cases | Yes, to sell in the EU |
| UL (US safety) | Will it shock, burn or start a fire? | A Nationally Recognized Testing Laboratory (NRTL) | Usually a market requirement, not a federal one |
FCC. Part 15 sorts electronics into two kinds. Anything that uses digital timing signals faster than 9 kHz is a digital device, which makes it an unintentional radiator: it is not meant to emit RF, but it does. Most of those can be authorized by Supplier’s Declaration of Conformity (SDoC) or certification, and the party responsible for an SDoC must be located in the United States. Add a radio and the product is also an intentional radiator, which generally must be certified by a Telecommunication Certification Body before you can market it.
CE. For products with a radio, the governing law is the Radio Equipment Directive 2014/53/EU. Its essential requirements cover safety, electromagnetic compatibility and efficient use of the radio spectrum (European Commission). Where you apply the harmonised standards, Article 17 lets you use internal production control: you assess conformity, keep the technical documentation and sign the declaration yourself. Certain internet-connected radio products have also carried cybersecurity requirements since August 2025, and the Commission has scheduled those to give way to the Cyber Resilience Act’s obligations on 11 December 2027 (European Commission).
UL. UL is one of the labs on OSHA’s list of NRTLs, alongside Intertek, CSA, TÜV SÜD and others. For most consumer products there is no legal requirement for UL approval, but retailers expect safety certification and some marketplaces require specific UL standards for certain categories. Workplaces are different: OSHA’s general industry rules call for NRTL approval of electrical equipment under many conditions of use.
What the lab measures, and what it costs
Emissions testing measures what the product radiates and, for anything that plugs into the wall, the RF voltage it conducts back onto the AC power line. Radio testing checks the transmitter. Safety testing reviews how the product is built and how it behaves when parts fail.
Published price ranges are estimates, not quotes. One compliance-planning site puts FCC certification at $1,500–$5,000 for a simple digital device on the declaration path, $3,000–$10,000 for an IoT product on a pre-certified module, and $8,000–$20,000 for a custom single-band radio, with each re-test after a failure adding $2,000–$10,000 (MarkReady). A hardware development firm puts certification for products on pre-certified modules at roughly $3,000–$8,000, and well over $50,000 once a custom radio or battery pack is involved (Predictable Designs). Most of that spread comes from decisions you control.
Where the second bill comes from
- Testing a design that is still moving. Under FCC rules, changes to a radio’s frequency-determining circuitry (including clock or data rates), its modulator, or its maximum power need a new grant of certification. Changes that make reported performance worse are Class II permissive changes: you file new test data, and you cannot market the modified product until the FCC acknowledges it. The board you certify should be the board you ship. In build terms, that is a DVT unit, not an EVT one.
- Skipping the pre-scan. An EMI pre-scan belongs in engineering validation, the first real prototype build. A near-field probe and a spectrum analyzer on your bench can find the noisy clock, the long ribbon cable or the switching regulator that you would otherwise discover in a chamber you are paying for.
- Designing your own radio when a module would do. A pre-certified module carries its own grant, and the FCC lets modules be used in multiple hosts without approving each one. That does not exempt your product: you still owe Part 15 Subpart B compliance for everything else on the board, and the module must run with the antennas its grant allows. Put the radio chip on your own board only when cost, size or performance demand it, and budget full transmitter certification when you do.
- Building your own mains supply. End-product makers commonly ask for power supplies already certified to EN 62368-1 to reduce the testing effort. An external, certified adapter also keeps mains voltage out of your enclosure entirely.
- Certifying one market at a time. If you will sell in the US and the EU within the same year, ask each lab to quote one test plan that covers both.
Before you book the lab
- Production-intent hardware, with any later change checked against the permissive-change rules
- Pre-scan results from your own bench, with the worst emitters already fixed
- The firmware test modes the lab asks for, built and documented before units ship to them
- Schematics, BOM, block diagram and antenna details in one folder
- Label and user-manual text drafted for each market
- A written list of markets, and the radios in each SKU
What to do this week
- Write down every market and every radio in each SKU, then map each one to its regime.
- Run a near-field pre-scan on your current board and fix the loudest emitter while the layout is still cheap to change.
- Decide module versus chip-down in writing. If it is a module, confirm its grant covers your antenna and your use case.
Start with our certification map to see which tests apply to your product. If you want a second pair of eyes on the plan, send us a brief.