In 2015 a review of local government boundaries by the NSW Government Independent Pricing and Regulatory Tribunal recommended that Manly, Pittwater and Warringah merge to form one single council.
The government eventually considered three proposals.
The first proposed a merger of Manly and Mosman councils and parts of Warringah to form a new council with an area of 49 square kilometres (19 sq mi) and support a population of approximately 153,000.
The second proposed a merger of Pittwater Council and parts of Warringah to form a new council with an area of 214 square kilometres (83 sq mi) and support a population of approximately 141,000.

The third proposal, submitted by Warringah Council on 23 February 2016, was for an amalgamation of the Pittwater, Manly and Warringah councils.
Of the 44,919 submissions lodged to the Boundaries Commission about all the local government proposals statewide, 29,189 were from Northern Beaches residents (18,977 were submitted for the third proposal); this meant that the Northern Beaches proposals made up 65% of all submissions.
Former Warringah mayor, Michael Regan, noted to the Manly Daily that this was an indication of the level of interest in the Northern Beaches over the future of their local government: "given the choice of splitting the northern beaches or uniting it the community opted for unity", while former Manly mayor, Jean Hay, commented that this interest translated into the final result: "Everyone is passionate about the area and we came out and let the powers-that-be know, [...] It must have made an impact because the minister and the premier looked at what the community told them and it was the majority decision to go with a single council."

On 12 May 2016, with the release of the Local Government (Council Amalgamations) Proclamation 2016, the Northern Beaches Council was formed from Manly, Pittwater and Warringah councils.
The first meeting of the Northern Beaches Council was held at Manly Town Hall on 19 May 2016.
Several advisory committees were established at the council's first meeting to advise the Administrator and the Council on implementation matters, composed of former councillors and mayors of the three councils.
These included Manly Mayor Jean Hay as Chair of the Implementation Advisory Group and Chair of the Social Committee, Warringah Mayor Michael Regan as Chair of the Economic Committee and Pittwater Deputy Mayor Kylie Ferguson as Chair of the Environment Committee.
In 2015 a review of local government boundaries by the NSW Government Independent Pricing and Regulatory Tribunal recommended that Manly, Pittwater and Warringah merge to form one single council. The government eventually considered three proposals. The first proposed a merger of Manly and Mosman councils and parts of Warringah to form a new council with an area of 49 square kilometres (19 sq mi) and support a population of approximately 153,000. The second proposed a merger of Pittwater Council and parts of Warringah to form a new council with an area of 214 square kilometres (83 sq mi) and support a population of approximately 141,000.
The third proposal, submitted by Warringah Council on 23 February 2016, was for an amalgamation of the Pittwater, Manly and Warringah councils. Of the 44,919 submissions lodged to the Boundaries Commission about all the local government proposals statewide, 29,189 were from Northern Beaches residents (18,977 were submitted for the third proposal); this meant that the Northern Beaches proposals made up 65% of all submissions. Former Warringah mayor, Michael Regan, noted to the Manly Daily that this was an indication of the level of interest in the Northern Beaches over the future of their local government: "given the choice of splitting the northern beaches or uniting it the community opted for unity", while former Manly mayor, Jean Hay, commented that this interest translated into the final result: "Everyone is passionate about the area and we came out and let the powers-that-be know, [...] It must have made an impact because the minister and the premier looked at what the community told them and it was the majority decision to go with a single council."
On 12 May 2016, with the release of the Local Government (Council Amalgamations) Proclamation 2016, the Northern Beaches Council was formed from Manly, Pittwater and Warringah councils. The first meeting of the Northern Beaches Council was held at Manly Town Hall on 19 May 2016. Several advisory committees were established at the council's first meeting to advise the Administrator and the Council on implementation matters, composed of former councillors and mayors of the three councils. These included Manly Mayor Jean Hay as Chair of the Implementation Advisory Group and Chair of the Social Committee, Warringah Mayor Michael Regan as Chair of the Economic Committee and Pittwater Deputy Mayor Kylie Ferguson as Chair of the Environment Committee.
Northern Beaches Council