District of Columbia
The District of Columbia has two types of construction contractor licenses - the Home Improviement Contractor License and the General Contractor/Construction Manager License.
The District of Columbia doesn’t require general contractors to pass an exam to obtain a license. However, subcontractors working in specialty trades (asbestos workers, plumbers, electricians, refrigeration and air conditioning mechanics, steam and operating engineers, and those in the elevator trades) need additional licenses as required by the District of Columbia Board of Industrial Trades.
If you want to search for companies that are licensed in the District of Columbia, you will be required to sign up for an account.
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If you're going to construct a concealment site in the Capitol Rotunda, you're going to need an electrical license, otherwise there is no licensing required. This seems a little incongruous coming from the nation's capitol where they love to license and oversee everything you can think of, including proposed legislation for the proper sentence construction for prepositions at the end of sentences.