Comprising some 250 acres (100 ha) Snelsmore Common represents one of the largest tracts of lowland heath remaining in Berkshire, accounting for one sixth of the total of this sort of habitat in the county. Some of the heath has been overtaken by woodland, mainly deciduous to the west, but more coniferous in the east. The boundary between heathland and woodland being encroached by birch scrub which is controlled by voluntary conservation groups who are attempting to increase the area of heather. Habitat variety is enhanced by a valley bog with its particular flora, including Bog Bean, Bog Asphodel and Sundew.

The site is excellent for butterflies, including White Admiral and Purple Emperor. Lizard and Grass Snake can be found, and Adders are prevalent in some years. Mammal species could include Fox, Badger, Stoat, Weasel and occasional deer. Frogs and newts can be plentiful in the various pools that have been formed. Specialist birds of this type of habitat are Nightjar, Woodcock, Dartford and Wood Warbler that been recorded in past years. Summer visitors include Hobby, Chiffchaff, Garden and Willow Warbler, Whitethroat, Blackcap and Goldcrest. Winter visitors include Song and Mistle Thrush, Siskin, Lesser Redpoll, Tawny Owl and occasional Crossbill.

Grid Reference: SU463710