Grounds & Building


Situated adjacent to the 120 acre landscaped parkland of Mill Hill School but within its own grounds, Grimsdell offers a secure, independent environment for the school community. Our grounds are maintained to a very high standard offering our pupils the best possible facilities and grounds for their enjoyment.

A large manicured lawn flanks the side of the school building and at the rear of the building is our Science garden and pond where fruit and vegetables are grown and children get first-hand experience of a variety of science topics.

Our Nursery pupils have their own bespoke play area, comprising a vast space with age appropriate equipment and large scale musical instruments. Reception children also use this area during the school day.

A large wooden adventure playground and an all-weather astro-turf are opposite the main school building. These give the children challenge and adventure as well as the opportunity to play safely all year round. A range of different equipment is available for the children to use during break and lunch time, including large scale outdoor play structures for climbing and balance, an outdoor stage area and large outdoor musical instruments. An arts and crafts leader also provides creative outdoor craft opportunities in a sheltered area for the children during lunch time.

We use the 25 metre Dame Angela Rumbold indoor swimming pool at Mill Hill School for our swimming lessons and the Patrick Troughton Theatre, also at Mill Hill School, for many of our productions.


Winterstoke House was originally a vicarage to the Vicar of St Paul's and was sold to Mill Hill School in October 1923. It was purchased to become a school boarding house to host some 42 boys. After some discussion, it was decided that in recognition of the many years of service given to the school by the late Lord Winterstoke and of his magnanimous gifts, the new boarding house be named Winterstoke House. The boarding house was officially opened on Saturday 29th November 1924 by Dame Janet Stancombe Wills, a niece to Lord Winterstoke.

“Grimsdell offers a secure, independent environment for the school community.”