The blockhouse at Jellicoe Park is the only survivor from the series of defence posts constructed around Auckland at the time of the land wars. Its brick walls are 11 inches thick. (It was built in 1860).

The Blockhouse occupies the heights of a grassy knoll in the south-western corner. It housed 12 militia from 1863 to 1865. Because of its historical significance the blockhouse has now been restored.

There are two other heritage buildings both of which have been moved on to the site; Journey's End, a Fencible cottage and Laishley House, named after the Congregational Minister who first occupied it.

The park has a children's playground and features as a venue for "Music in Parks".