Work on the trio of sites will start this Autumn with the biggest being an £8m job for Queen Victoria NHS Foundation Trust in East Grinstead.
Willmott Dixon will build six new theatres, alongside an admissions suite and a day surgery unit by December 2012.
The firm has also been chosen by West London Mental Health NHS Trust for a £7m scheme at Broadmoor Hospital in Berkshire.
This will see the company’s Cobham office deliver a new training facility and energy centre, and undertake enabling works in preparation for a proposed redevelopment of the site.
The enabling work will be completed by July 2013.
The final win is for East and North Hertfordshire NHS Trust for a £5m project at the Lister Hospital in Stevenage.
This will see Willmott Dixon’s Hitchin office refurbish an intensive care unit, a 30 bed inpatient ward as well as create a new chemotherapy facility.