On 6 May 1914 at 3.00pm the Foundation Stone was laid on the current site to commemorate the building of a new School,

It was a fine day, though grey clouds were blowing up from the West. Over the entrance hall, on the right of which the stone was to be laid, an awning had been stretched, and flags waved from scaffold poles. Here and around the front of the enclosure, where the School and staff were assembled, a large crowd gathered when the Mayor, the President of the Corporation arrived in their civic robes. Then came the Bishop, with the Vicar, who bore the Bishop's cozier. On the one side stood the Mayor and Corporation, and on the other the Governors of the School and the Head Master.

Overshadowed by the First World War, the school was not formally opened, instead Speech Day on 15 July 1915 incorporated an official opening ceremony.

By invitation of Rt. Rev. the Lord Bishop of Buckingham D. D., the order of ceremonies was as follows.

The Chair of Governors, Worshipful Mayor of Wycombe (J. Gomm, Esq., J.P., C.C.)
The Most Hon. the Marquess of Linconshire, K.G., to propose a vote of thanks to the Bishop for Laying the Stone.
Mr. D. Clarke (the Vice-Chairman of the Governors and Vice-Chairman of the County Council) to second the resolution.
The Lord Bishop to reply.
Mr George Wheeler to propose a vote of thanks to the Mayor for presiding.
Lt.-Col Hobart, D.S.O., to second the resolution.
The Mayor to reply

From medieval poor house to school

The RGS was first established in the reign of Edward VI by the Mayor of Burgesses of the town, who purchased the ancient Hospital of St. John the Baptitst, and converted it into a grammar school as a refuge for the needy.

In the 1530s, Henry VIII seized numerous religious institutions in his bid to oust the influence of Catholicism. Continuing confiscations rendered ownership of the Hospital unclear. Eventually, it was made over to the Borough of Wycombe in April 1549 by Master of the Mint, Sir Edward Peckham, on proviso that, “a Grammar School to be founded” within two years. A Preliminary Charter was rushed through in 1551, followed by the Royal Charter in 1562 granted by Queen Elizabeth l. During this period, the School received endowments from various benefactors.

In 1882, the old buildings were demolished, the ancient Norman Arches were exposed to view, and a new School was built on somewhat higher ground than the old site at Easton Street.

Three decades later, the School needed more space and on 6 May 1914, the Foundation Stone was laid on the current site to commemorate the building of a new School.