Pimelea approximans is a perennial shrub that typically grows to a height of and has densely hairy young stems. The leaves are elliptic, mostly long and wide, on a petiole long. The flowers are borne in spikes of 50 to 130 on a densely hairy rachis long. The flowers are yellow, the floral tube long, the sepals long and densely hairy on the outside. Flowering occurs in May and June and the fruit contains a dark brown, oval seed long.