Bunkers Park, as we know it today, started in 1995 when Dacorum Borough Council (DBC) acquired the land from the Commission for New Towns (later known as English Partnerships). Prior to this, the land had been farmed for many centuries with maps from 1877 showing the field boundaries. The hedgerows along the edges of the park are thought to date back to the 10th century and locally there is evidence of an Iron Age farmstead just to the south west of the Park.

With the land in the possession of the Council, and following work carried out by the Herts and Middlesex Wildlife Trust, plans were put together in 1997 to identify a vision for the future open space. The Management Plan was finalised by the end of that year and in February 1998, with the help of 200 local residents and 600 local school children, Chambersbury Wood was planted in the fields on the northern side of the Park. The planting was so successful that, 12 years later, it became necessary to thin out some of the trees to allow others to develop to their full potential. The Park extends to 123 acres and, together with Long Deans, forms a leisure area and nature reserve to the east of Hemel Hempstead. The land forms a natural boundary to development and is part of the Green Belt surrounding the town.

Some of the original field names remain, such as Long Saunders (adjoining Bunkers Lane), Bunkers Common and White Field, which is now known as Bottom Field, while Chambersbury Wood is where Winchdells and Hill Field used to be. Mattens are the fenced pastures in the fields once called Winchdells and Rumballs and are now home during summer months to a small herd of Belted Galloway cows from Box Moor Trust.