Two overspill car parks, creating 200 extra parking spaces, are planned for the Raigmore Hospital site.
Work began on the two car parks this month and is expected to be completed in November 2019.
The project received a £620,000 grant from the NHS Highland Endowment Board.
The work, which is being carried out by Kier Regional Building, Scotland, will also include the installation of barrier controls.
David Park, chief officer for NHS Highland, said: “We have known for some time that the car park at Raigmore Hospital does not have the capacity to fully deal with the peak traffic that comes onto the site each day and are very sympathetic to the frustration that gives to our patients, visitors and staff.
“I’m delighted to see, thanks to approval from the endowments trustees for the funding, that work has started on the overspill car parks at Raigmore Hospital which will overall improve the experience of our patients and visitors.”
Sean O'Callaghan, Area Operations Director at Kier Regional Building, Scotland commented: "NHS Highland provides a vital service for the community. We are delighted to support that by improving the car parking at Raigmore Hospital. We appreciate that a hospital visit can be stressful for patients and visitors, so we are very pleased to play a small part in improving the patient and visitor experience."