A contractors license is more than just a business license

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• A contractors license is is required by law "if a job is $1,000 or more"   Source.  

• A contractors license is required by law to install rock, plant trees, shrubs...and to lay sod.  Source

•  A contract with an unclicensed contractor is not valid...the bid or contract shall be deemed “void ab initio”. (source). 

• The Residential Recovery Fund may cover up to $35,000 in damages if a property owner is harmed by failure of a properly licensed contractor to properly perform qualified services.  Source 

• "...Unlicensed (Improperly) contracting activity is illegal in Nevada and penalties can escalate from a misdemeanor, to a gross misdemeanor and to a Class E felony.  Source  

You can check who is licensed by contacting the Nevada Contractors Board.