The contractor has now started its fourth year providing mechanical and electrical services, building maintenance, security and grounds maintenance to the public body which owns a portfolio of 3,500 buildings - about 10% of the NHS estate.
NHS Property Services, which manages health centres, GP surgeries, hospitals and offices as part of a £3 billion portfolio, consolidated 2,300 individual contracts into five large ones in 2016, to save money.
Managing director engineering and integrated FM at Mitie, Carlo Alloni, said: "We are delighted to have extended our contract with NHS Property Services into a fourth year. This requires a large-scale mobile facilities management operation across a wide range of services, showcasing the breadth of expertise we can bring to such specialist contracts.
"Delivering on our commitments in the original contract has earned this extension and enables NHS Property Services to use the cost savings we have generated to reinvest in patient care."
NHS chief operating officer NHS Property Services Martin Steele said the contract extension reflected Mitie’s commitment to improve service performance whilst reducing running costs.
Mitie's landscape maintenance company, Mitie Landscapes, is ranked at number nine in the Horticulture Week Top 70 Landscape and Maintenance Contractors listing.
Mitie Landscapes reported an 11% rise in turnover to £47.1 m (£42.3m) and a 27% rise in profits - £7.8m (6m) - across its exterior and interior landscapes and winter maintenance divisions in its latest accounts, published in December.