The £6 million development is Wycliffe’s most ambitious development in its 136-year history.
Called Ward’s-Ivy Grove, it brings together a boys’ House and a girls’ House into a single building at the Stonehouse school.
Some of the bricks from the original building were added to the foundation of the new development on the site of the Victorian boys’ House.
During the visit, the Duchess met many of the residents of the new Ward’s-Ivy Grove, including Boarders and Flexi-Boarders and toured the bedrooms.
Twins Ben and Harry Tovey, from Monmouthshire, who are Flexi-Boarders, had the opportunity to personally show the Duchess what they consider their “home” two nights a week. They are the third generation of their family to attend Wycliffe.
Luke Song, Charlie Jones, Hamish Armstrong and Hywel Farrow-Wilton, also showed off their new rooms to the Duchess before handing over to the girls of Ivy Grove.
Madeleine Stokes and Faith-Ann Fitzpatrick, whose families are in the Forces, board full-time at Wycliffe.
The Duchess also stopped to chat with pupils Polina Vapne, Georgina Loring, Eleana Irvine, So-phia Levy and Izzy Rowland, who were in their rooms.
Following the tour, the Duchess met pupils, staff and Trustees before unveiling the Foundation Stone.
Wycliffe College is a significant local employer with more than 300 staff, educating more than 700 pupils across Prep and Senior schools, with 450 Day pupils and 250 pupils who board.
The new facility will enable Wycliffe College to significantly develop the possibility of greater Flexi Boarding between one and four nights per week.
Head of Wycliffe College, Mr Nick Gregory, said:
Ward’s-Ivy Grove not only supports busy families in which both parents might be undertaking ‘professional’ jobs but allows the benefits of a Boarding education/experience to be extended to Day pupils and also expands the College’s catchment area across the whole county and into surrounding counties.