Mayor Bill de Blasio on Thursday released New York City’s preliminary budget worth $82.1 billion.

The budget accounts for a $15 an hour minimum wage for all city employees and contract workers at a cost of $115 million, more than $50 million more in homelessness prevention and $3 million more on a gunshot detection system.

The mayor’s presentation — held in the City Hall Blue Room — begins the New York City budget season, a process that must be completed before the beginning of the new fiscal year, July 1.

By spring, de Blasio must present a revised budget, when the City Council will convene hearings and final negotiations between de Blasio’s office and the council and concluding with a ceremonial handshake under the rotunda of City Hall.

Last year, de Blasio’s preliminary budget was $77.7 billion when unveiled Feb. 9 but increased to $78.5 billion when adopted in June following negotiations with the City Council.

Among the added items: 1,300 more NYPD cops de Blasio had initially opposed.