Your contractor license number: where Minnesota requires it

Who Minnesota licenses — and who is exempt

If Minnesota licenses you as a residential building contractor, remodeler, or roofer, your license number has to appear in your advertising, and the statute lists vehicles, signs, business cards, flyers, brochures, and websites by name. If you are exempt from licensure, you have no license number to display, so the advertising rule does not reach you.

The licensing requirement lives in Minn. Stat. § 326B.805, subdivision 1, covering four groups: residential building contractors, residential remodelers, residential roofers, and manufactured home installers. The definitions turn on “special skills.” Section 326B.802 lists eight categories — excavation; masonry and concrete; carpentry; interior finishing; exterior finishing; drywall and plaster; residential roofing; and general installation specialties — and a contractor or remodeler is someone who contracts with an owner to build or improve residential real estate by providing two or more of them.

Subdivision 6 lists the exemptions. Among them: employees of a licensee doing work for that licensee; material suppliers who do not install; owners who build or improve residential real estate they will occupy or keep as a rental, but not for resale or speculation; architects and professional engineers; a person whose total gross annual receipts for the licensable work do not exceed $15,000, which requires a certificate of exemption from the commissioner; mechanical contractors; plumbers and electricians when doing their own licensed work; specialty contractors who provide only one special skill; school districts and technical colleges; and Habitat for Humanity and Builders Outreach Foundation volunteers.

Read that one-skill exemption alongside subdivision 1 rather than on its own. Roofing is a single special skill under section 326B.802, but subdivision 1 still names residential roofers as a group that must be licensed — so a roofer does not fall out of the requirement the way a one-trade specialty contractor might. If your trade sits near that line, ask DLI where you land before you letter anything.

Here is why the rule exists, in one sentence: the number is the thread a homeowner can pull to look you up and check that you are current. That is why DLI publishes a public license and registration lookup — the number in your ad is what makes the lookup useful.

What the statute actually says

The section is Minn. Stat. § 326B.87, titled “License number; advertising.” Three short subdivisions, worth reading as written.

Subdivision 2, advertising, is the one most contractors are searching for: “The license number of a licensee must appear in any advertising by that licensee including but not limited to signs, vehicles, business cards, published display ads, flyers, brochures, websites, and Internet ads.”

Subdivision 1, display, adds the paperwork side: the number goes on all building permits and permit applications made to or issued by the state or a political subdivision; in jurisdictions that have not adopted the State Building Code, on the site plan review or zoning permit; and on all business cards and all contracts to perform work for which a license is required.

Subdivision 3, contracts, goes further than the number alone: contracts entered into by a licensee must state that the person is licensed and state the license number.

Two phrases carry the weight. “Any advertising” and “including but not limited to” make the list a floor, not a ceiling. One practical note the statute does not address: if the truck is lettered with a d/b/a that does not match the name on your license record, the number alone will not connect the two for a homeowner running the lookup. Ask DLI before you advertise under a name that is not on the license.

Where it has to appear in practice

Translated into the things a print shop actually produces: the middle column is what the statute names, the right column is design judgment, not law.

Fix it at the template level. Contractors who add the number piece by piece are the ones who find a run of door hangers went out without it. Our contractor branding guide covers the rest of the rollout, and the contractors and trades page shows what gets ordered together.

How big does it have to be? The law does not say

This is the question we field most, and there is no number to give you. Section 326B.87 specifies no minimum type size, no font, and no location — and DLI states the same thing in its residential contractor FAQ: the law does not require a specific size print or location for the license number. Anyone who tells you Minnesota mandates a height is repeating folklore, the way the “two-inch rule” myth attached itself to DOT lettering.

What that leaves is design judgment. Our standard is readable at the distance the piece is actually read, which means something different on each surface.

• Cards, contracts, door hangers, and flyers are read at arm’s length. Footer type at the size of the address line is enough.
• Yard signs are read from the curb. Bottom edge, sized so someone standing at the sidewalk can read it, with the top left for the name and phone number.
• Trucks are read from another lane. The name and phone number carry across a parking lot; the license number only has to be findable when someone walks up. Our letter height calculator and sign viewing distance calculator will size both.

Two things to avoid: shrinking the number until a homeowner has to hunt for it, and setting it like a headline. It is credentialing, not a selling point.

The USDOT number is a completely different rule

These two get tangled constantly. The contractor license number comes from DLI under chapter 326B and identifies who is doing residential construction. The USDOT number comes from the federal motor carrier marking rule, 49 CFR 390.21, which Minnesota adopts by reference, and identifies who is operating a commercial motor vehicle.

Different agency, different trigger, different vehicles. A remodeler hauling their own materials in a half-ton pickup may owe the license number and no USDOT marking at all; a hauler over 10,000 pounds, or an intrastate for-hire carrier at any weight, may owe the USDOT marking and no license number, because the work is not licensable residential construction. Some trucks owe both, and then they are two blocks of type doing two jobs. Our USDOT number lettering guide covers the federal side.

What happens if the number is missing

Leaving the number off is a compliance defect, not a printing preference. Section 326B.87 sits inside the range covered by Minn. Stat. § 326B.84, which makes it grounds for sanctions when a licensee “has violated or failed to comply with any provision of sections 326B.802 to 326B.885,” and directs the commissioner to the enforcement provisions in section 326B.082. What that means in your situation is DLI’s call, not ours — confirm with the Minnesota Department of Labor and Industry.

The cost most contractors actually feel is duller: a reprint. Signs, cards, hangers, and truck lettering all get redone, usually mid-season, and vehicle vinyl is the slowest of the four to correct.

A pre-print checklist for a rollout

Run this once, at the top of a rebrand or a fleet order, and it never has to be run again.

• Confirm the number and the name. Pull your own record on the DLI lookup and make sure the business name you are about to letter matches the name on the license.
• Write it one way. Pick a single format and use that exact string everywhere, so the card, the sign, and the truck agree.
• Put it in the master files. Logo lockup, letterhead, estimate and contract templates, and the website footer, all at once.
• Check the contract language too. Subd. 3 wants a statement that you are licensed as well as the number.
• Proof against the list. Before anything goes to press, hold the proof against the table above: cards, signs, hangers, vehicles, ads, website.

Tell us the number and the exact format you want on your quote request and the truck, the yard signs, and the business cards all carry the same string. Again: this is a general overview for print planning, not legal advice. For anything that turns on your own license status, ask DLI.

Frequently asked questions

• Does my contractor license number have to be on my truck in Minnesota?

  If you hold a Minnesota residential contractor, remodeler, or roofer license, yes. Minn. Stat. § 326B.87, subd. 2 says the license number must appear in any advertising by the licensee, and it names vehicles specifically. A lettered work truck is advertising. If you are exempt from licensure there is no number to display; confirm your status with DLI.

• Does the license number have to be on yard signs and job site signs?

  Yes. Subdivision 2 names signs alongside vehicles, business cards, flyers, and brochures, prefaced with the words including but not limited to. Put it on the bottom edge in one line so it does not compete with the company name and phone number at the top.

• How big does the contractor license number have to be?

  The statute sets no size. Section 326B.87 specifies no minimum type size, no font, and no location, and the Department of Labor and Industry states in its residential contractor FAQ that the law does not require a specific size print or location. Size it to be readable at the distance the piece is read.

• Do business cards and door hangers need the license number?

  Business cards are named twice, in subdivision 1 and again in subdivision 2. Door hangers are not named by that word, but subdivision 2 names flyers and brochures and covers any advertising, so a door hanger carries the number the same way a flyer does.

• What if I am a subcontractor or specialty contractor?

  It depends on whether you are licensed. Minn. Stat. 326B.805, subd. 6 exempts specialty contractors who provide only one special skill, and employees of a licensee working for that licensee, so a one-trade sub may hold no license at all. Roofers are the exception to watch: subdivision 1 names residential roofers as a group that must be licensed. If you do hold a license, the rule applies to your own signs, truck, and cards. Verify your classification with DLI.

• What happens if my license number is missing from an ad?

  Minn. Stat. 326B.84 makes failure to comply with any provision of sections 326B.802 to 326B.885 grounds for sanctions and points the commissioner to the enforcement provisions in section 326B.082. What that means in a specific case is up to DLI, so ask them. The consequence contractors feel most often is a reprint.