An artist's impression of Waitemata District Health Board's planned new surgical hospital.

Auckland's North Shore Hospital will be getting a new $220 million surgical facility, set for completion in 2022.

The development will be four-storeys high, with an estimated 120 beds and four operating theatres.

Waitemata District Health Board chief executive Dr Dale Bramley said the project would be the biggest single capital injection into the health needs of the district since construction of the North Shore Hospital tower block in the early 1980s.

SUPPLIED Waitemata DHB cheif executive Dale Bramley says the development is needed to meet the needs of fast-growing Waitemata.

Prime minister Jacinda Ardern and health minister David Clark announced the new development on-site on Friday.

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Old buildings within the existing hospital, but no longer used for clinical care, would be demolished next year to make way for construction.

The government promised $200 million towards the project and the remaining $20 million will come from Waitemata DHB, the country's biggest district health board.

​Bramley said the investment would ensure "a rapid response to the health needs of the fast-growing Waitemata population and would be well-received by our staff and our community".

"It also creates the opportunity for this new surgical hospital to become a specialist elective surgery centre within the Northern Region, which is consistent with our region's Long-Term Investment Plan, also released today."

The new hospital will include new endoscopy suites, clinical support service spaces and an extended sky bridge link connecting the surgical hospital to the main hospital tower.

Last month, the government announced a $305 million upgrade to hospitals within Auckland DHB: Auckland City Hospital, Greenlane Clinical Centre, and Starship Hospital.