“Do I have to put my license number on my truck and my website?” In a good number of states the answer is yes, and the law’s idea of “advertising” is wider than you might assume. It usually reaches the website, the online profiles, the yard sign and the business card, and sometimes the truck door. Here is what six states’ own laws and boards say, a table to compare them, and a checklist that works wherever you are.
California
Business and Professions Code §7030.5 says every licensee “shall include his license number in: (a) all construction contracts; (b) subcontracts and calls for bid; and (c) all forms of advertising.” The board’s regulation (16 CCR §861) defines advertising for that section to include any card, contract proposal, sign, billboard, “lettering on vehicles,” brochure, newspaper, magazine, “airwave or any electronic transmission,” and any directory listing under “Contractor.” The Contractors State License Board’s 2020 bulletin spells out that this includes “online sales postings and websites.”
Trucks have their own rule. Under §7029.6, a licensee’s business name and license number go on each commercially registered vehicle used in the business, “in print type of at least 72-point font or three-quarters of an inch in height and width.” Plumbing (C-36), sign (C-45) and well-drilling (C-57) contractors meet the stricter §7029.5: name, permanent business address and license number on each side of each such vehicle, in letters at least 1½ inches high.
On cost, the board’s advertising guide puts the civil penalty at $100 to $1,000 for a first offense, and its 2020 bulletin says penalties for licensees who break the advertising laws can range from $100 to $5,000. The same guide adds two rules worth knowing while you are editing your ads: advertise only within the classifications you hold, and do not advertise that you are bonded.
Florida
Florida Statutes §489.119(5)(b) requires the registration or certification number to “appear in each offer of services, business proposal, bid, contract, or advertisement, regardless of medium.” The Construction Industry Licensing Board’s rule (61G4-12.011(3)) lists what that covers: business cards, proposals, contracts, construction site signs, newspapers, airwave transmission, “any electronic media including Internet sites,” phone directories, flyers, billboards, coupon guides, and signs on vehicles. Balloons, pens, hats and clothing are out.
The vehicle rule is conditional. If a truck bears your name, or text or artwork that would lead a reasonable person to believe it is used for contracting, the number “must be conspicuously and legibly displayed” with it (§489.119(5)(c)). The same paragraph says it does not create a mandatory vehicle-signage requirement, and that local governments may also require locally licensed contractors to show their local numbers. For a missing number, the board issues a notice of noncompliance for the first offense, and may fine or cite you if it is not fixed within 30 days or happens again (§489.119(5)(e)). That is the construction-industry part of the law; electrical and alarm contractors are licensed by Florida’s separate Electrical Contractors’ Licensing Board, covered in our Florida licensing article.
Arizona
A.R.S. §32-1124(B) says the license number, preceded by “ROC,” goes in a conspicuous place where work is being performed, on all written bids and estimates, and on all published advertising and letterheads. Broadcast, internet and billboard ads need it too, unless the ad gives a web address that “directly links to a website that prominently displays the licensee’s name and license number.”
The Registrar of Contractors explained that exception in 2021: it covers “vehicle, radio, internet or billboard advertising,” and “prominently displayed” means the address links straight to your home page, where your name and ROC number appear clearly, in an appropriately sized font, not hidden behind graphics, and not in the website’s footer. A violation can bring discipline at the registrar’s discretion, but the statute says it is not grounds for voiding a contract (§32-1124(C)).
Oregon
The Construction Contractors Board’s rule, OAR 812‑003‑0120(2), goes medium by medium: newspaper ads, written bids and contracts, phone directory ads, radio (an audible statement of the number), television (shown on screen), and “all advertising by internet media, including but not limited to, website advertising.” Business cards, letterhead, signs at construction sites “and all other written or visual advertising” carry it too. Two things are out: permanent signs at your own place of business that mainly show your name, and promotional gifts. The board’s penalty schedule (OAR 812‑005‑0800) sets penalties of up to $100 for a first offense, $200 for a second and $400 after that.
Washington
RCW 18.27.100(3)(a) says all advertising that shows a contractor’s name or address “shall show the contractor’s current registration number,” and so must all materials used to solicit work directly from customers who are not businesses. Washington is the exception on trucks: signs on registered motor vehicles and on-premises signs “shall not constitute advertising” under that paragraph, and airwave ads are not covered by it either. The name you advertise must be the name you registered, and you may not advertise that you are “bonded and insured” because of the bond the law requires. After a hearing, a violation can cost up to $10,000, though the penalties do not apply to an inadvertent error.
Nevada
NRS 624.3017 makes it cause for discipline to advertise construction projects “without including in the advertisements the name and license number” of the licensed contractor responsible. NRS 624.288 puts your name and license number on each commercial vehicle registered in your name, in letters and numbers about 1½ inches high.
The six side by side
| State | Website and online ads | Truck lettering | Leaving it off |
|---|---|---|---|
| California | Yes, “any electronic transmission” | Name and number, 72-point or ¾ inch; C-36, C-45, C-57 add the address at 1½ inches | $100 to $1,000 first offense; up to $5,000 |
| Florida | Yes, “Internet sites” | If the truck shows your name or contracting text, the number goes with it | Notice first; fine or citation if not fixed in 30 days |
| Arizona | Yes, unless the ad links to a home page showing name and number, not in the footer | Same web-address exception | Discipline at the registrar’s discretion |
| Oregon | Yes, “website advertising” | Not named; the rule covers “all other written or visual advertising” | Up to $100, $200, then $400 |
| Washington | Yes, any ad showing your name or address | Vehicle signs are not advertising under the rule | Up to $10,000; not for an inadvertent error |
| Nevada | Ads must carry name and number | Name and number, about 1½ inches | Cause for discipline |
What counts as an ad
Read those definitions together and a pattern shows. Where a state defines advertising, it reaches anything that offers your work to the public: the website, a directory or lead-site listing, a newspaper or radio spot, a flyer, the yard sign at a job, the business card, and the proposal or estimate itself. The carve-outs are narrow and specific: Florida’s stationery and novelties, Oregon’s promotional gifts and permanent shop sign, Washington’s truck and on-premises signs. California’s “any electronic transmission” and Florida’s “any electronic media” are broad, so the safe habit is to put the number on every online profile that offers your work, not only on the website.
If you work under a minor-work exemption
The rules run the other way for someone who is not licensed: some states require the ad to say so, and advertising as a contractor can cost you a small-job exemption altogether. California’s, Florida’s and Arizona’s versions are in the last row of the exemption table in Do I Need a Contractor License? Read it before you print anything.
A 30-minute fix
- List every place your business name appears: website pages, online profiles and listings, social pages, truck doors and tailgates, yard signs, business cards, and your estimate, contract and invoice templates.
- Write the number exactly as issued, with any prefix your state uses (Arizona’s “ROC”), under the name the license or registration is in.
- On the website, put it on the home page in the body text, not only in the footer, and on the About and contact pages. Our guide to the pages a contractor site needs shows where.
- Add it to your estimate and contract templates; California, Florida, Arizona and Oregon all name bids or contracts.
- Measure the truck lettering against your state’s size rule before you order new decals.
- Check the county and city too: Florida lets local governments require their own license numbers. If you work in California, our California licensing article covers the classes your ads must stay within.
- Re-check every time you renew, and whenever you start working in a new state.
These are six states, checked on October 20, 2026. If yours is not among them, it may still have a rule of its own, and the way to find it is the same: find the board’s advertising rule, read its definition of advertising, and look for the vehicle section.
General information, not legal or tax advice. Rules change and vary by state; check with the agency named above or a professional for your situation.