Accessories for a fastener driving apparatus are disclosed, which accessories may be removably attached to a fastener driving apparatus. An extension accessory increases the length of reach of a fastener driving apparatus by including an extension rod and further improves accuracy with regard to driving a fastener into a substrate via a fastener retention mechanism. A chisel accessory provides added versatility for a fastener driving apparatus by including a chisel tool function in addition to a fastener driving function. A fastener setting accessory improves fastener driving ease and accuracy by driving fasteners presently in a substrate to a specific depth. The accessories are specifically designed to transmit an uninterrupted force from the fastener driving apparatus to a fastener or chisel for driving a fastener into or otherwise impacting or striking a substrate.