More than 300 12m pile casings have been delivered, about half the total required.
Concrete foundation work is set to begin early next year.
Te Whatu Ora Health New Zealand delivery, infrastructure and investment director Monique Fouwler said yesterday both sites were progressing well.
"The inpatient and outpatient sites will close from December 22 to January 8 for our contractors to take a well-deserved break," she said.