How do you check a contractor license in Kansas?

Kansas has a state registration for roofing contractors, run by the Attorney General under the roofing registration act, while plumbers, electricians and heating and air conditioning contractors may need a license from the county or city where they work, such as Johnson County. A lookup is an optional public-record step.

Source: Kansas Revisor of Statutes, section 50-6,121 (title of the roofing registration act), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 50-6,123 (certificate required), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 50-6,124 (administration of the act), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1509 (plumbers), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1526 (electricians), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1542 (heating, ventilation and air conditioning), read 22 October 2026.
Source: County government of Johnson County, contractor licensing page, read 22 October 2026.

The license lookup is yours to run on the state's site.

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Key facts

The core rule is in section 50-6,123, which reads: "No person shall engage in the business of or act in the capacity of a roofing contractor within this state without having a valid registration certificate as required by this act."
Source: Kansas Revisor of Statutes, section 50-6,123 (certificate required), read 22 October 2026.
The public listing is in section 50-6,136, which reads: "The attorney general shall establish a system for the public to confirm roofing contractor registration certificates."
Source: Kansas Revisor of Statutes, section 50-6,136 (public information system), read 22 October 2026.
Section 12-1509 opens with "Any county or city requiring the licensure of plumbers practicing within the county or city".
Source: Kansas Revisor of Statutes, section 12-1509 (plumbers), read 22 October 2026.

Which contractors need a state registration certificate in Kansas?

Roofing contractors. The Kansas Revisor of Statutes publishes the roofing law, read 22 October 2026, and section 50-6,121 names it: the sections "shall be known and may be cited as the Kansas roofing registration act."

Source: Kansas Revisor of Statutes, section 50-6,121 (title of the roofing registration act), read 22 October 2026.

The core rule is in section 50-6,123, which reads: "No person shall engage in the business of or act in the capacity of a roofing contractor within this state without having a valid registration certificate as required by this act."

Source: Kansas Revisor of Statutes, section 50-6,123 (certificate required), read 22 October 2026.

The definition in section 50-6,122 covers a person who: "Engages in the business of commercial or residential roofing services for a fee; or (B) offers to engage in or solicits roofing-related services, including construction, installation, renovation, repair, maintenance, alteration and waterproofing."

Source: Kansas Revisor of Statutes, section 50-6,122 (definitions), read 22 October 2026.

Section 50-6,124 names who runs it: "the attorney general is authorized to administer and implement the provisions of this act."

Source: Kansas Revisor of Statutes, section 50-6,124 (administration of the act), read 22 October 2026.

How can you look up a roofer in Kansas?

Section 50-6,136 reads: "The attorney general shall establish a system for the public to confirm roofing contractor registration certificates." The same section adds: "Such system shall include a listing of valid registration certificates".

Source: Kansas Revisor of Statutes, section 50-6,136 (public information system), read 22 October 2026.

You can also look for the number itself. Section 50-6,135 reads: "A roofing contractor shall display such contractor's roofing contractor registration certificate number issued pursuant to this act on each commercial vehicle used for roofing services and upon every business sign, card, correspondence and contract used to solicit and conduct roofing services in this state."

Source: Kansas Revisor of Statutes, section 50-6,135 (display of the certificate number), read 22 October 2026.

When a permit is needed, the same section says "a roofing contractor shall supply the permit-issuing official the roofing contractor's registration certificate number issued pursuant to this act."

Source: Kansas Revisor of Statutes, section 50-6,135 (display of the certificate number), read 22 October 2026.

A listing is a public record, not a recommendation. Section 50-6,136 says disclosure through the system "shall not be deemed to be an endorsement of any roofing contractor or determination of any facts, qualifications, information or reputation of any roofing contractor by the attorney general".

Source: Kansas Revisor of Statutes, section 50-6,136 (public information system), read 22 October 2026.

When does the roofing registration act not apply in Kansas?

The exemptions are in section 50-6,129. One covers "An actual owner of commercial, residential or farm property who physically performs, or has employees who perform, roofing services" on that owner's own property.

Source: Kansas Revisor of Statutes, section 50-6,129 (exemptions), read 22 October 2026.

Another covers small jobs, where the price on each project "that is quoted, bid, offered, agreed, contracted, billed, collected and paid at less than $2,000."

Source: Kansas Revisor of Statutes, section 50-6,129 (exemptions), read 22 October 2026.

The same section limits that small-job exemption: "This exemption does not apply to a person who advertises or puts out any sign or card or other device which might indicate to the public that the person is a roofing contractor or that the person is qualified to engage in the business of a roofing contractor."

Source: Kansas Revisor of Statutes, section 50-6,129 (exemptions), read 22 October 2026.

Section 50-6,138 ties the roofing act to consumer law: "Any violation of this act shall be deemed to be a deceptive or unconscionable act or practice under the provisions of the Kansas consumer protection act."

Source: Kansas Revisor of Statutes, section 50-6,138 (consumer protection act), read 22 October 2026.

Who licenses plumbers, electricians and heating contractors in Kansas?

Counties and cities that require a license. On other trades, section 50-6,137 reads: "This act shall be construed to be in addition to, and not in lieu of, any required licensure of persons for certain professions and trades in this state".

Source: Kansas Revisor of Statutes, section 50-6,137 (effect on other statutes), read 22 October 2026.

The trade sections speak of local licensing. Section 12-1509 opens with "Any county or city requiring the licensure of plumbers practicing within the county or city", section 12-1526 with "Any county or city requiring the licensure of electricians practicing within the county or city", and section 12-1542 with "Any county or city requiring the licensure of mechanical heating, ventilation and air conditioning contractors and master and journeyman heating, ventilation and air conditioning mechanics practicing within the county or city".

Source: Kansas Revisor of Statutes, section 12-1509 (plumbers), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1526 (electricians), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1542 (heating, ventilation and air conditioning), read 22 October 2026.

One example is the county government of Johnson County. Its contractor licensing page, read 22 October 2026, says: "Contractor Licensing is a division of the Department of Planning, Housing and Community Development and is responsible for issuing and tracking 11 types of construction contractor licenses."

Source: County government of Johnson County, contractor licensing page, read 22 October 2026.

The county's license types page describes a residential class that allows a company "to construct, remodel, repair, and demolish single-family or duplex residences and buildings accessory thereto."

Source: County government of Johnson County, new license and license types page, read 22 October 2026.

It also describes a roofing class that "entitles the holder thereof to perform only roofing services for all structures regardless of occupancy or height."

Source: County government of Johnson County, new license and license types page, read 22 October 2026.

What should you ask a Kansas contractor before you search?

Find out what kind of work the job is, then look in the right place: the Attorney General's roofing registration system for roofers, and your county or city for other trades. These are practical suggestions, not state rules.

Source: Kansas Revisor of Statutes, section 50-6,136 (public information system), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1509 (plumbers), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1526 (electricians), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1542 (heating, ventilation and air conditioning), read 22 October 2026.

Ask whether the job is roofing, or plumbing, electrical, heating and air conditioning, or general building work.
Source: Kansas Revisor of Statutes, section 50-6,122 (definitions), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1509 (plumbers), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1526 (electricians), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1542 (heating, ventilation and air conditioning), read 22 October 2026.
For roofing, look for the registration certificate number on the contractor's vehicle, sign, card, correspondence and contract.
Source: Kansas Revisor of Statutes, section 50-6,135 (display of the certificate number), read 22 October 2026.
Look up that number in the Attorney General's public listing of valid registration certificates, quoted above from section 50-6,136.
Source: Kansas Revisor of Statutes, section 50-6,136 (public information system), read 22 October 2026.
For other trades, ask your county or city whether it licenses that work. The contractor portal of the county government of Johnson County offers a company search, a person search and a class search.
Source: Kansas Revisor of Statutes, section 12-1509 (plumbers), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1526 (electricians), read 22 October 2026.
Source: Kansas Revisor of Statutes, section 12-1542 (heating, ventilation and air conditioning), read 22 October 2026.
Source: County government of Johnson County, contractor licensing page, read 22 October 2026.
Source: County government of Johnson County, contractor portal search page, read 22 October 2026.
Keep in mind that a registration listing is a public record and not an endorsement of the contractor.
Source: Kansas Revisor of Statutes, section 50-6,136 (public information system), read 22 October 2026.

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Source: InstaBids process and privacy, live-page excerpts, read 22 October 2026.

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How do you check a contractor license in Kansas?

Key facts

Which contractors need a state registration certificate in Kansas?

How can you look up a roofer in Kansas?

When does the roofing registration act not apply in Kansas?

Who licenses plumbers, electricians and heating contractors in Kansas?

What should you ask a Kansas contractor before you search?

Who sees your contact details when you post a job on InstaBids?

Sources for the facts on this page