Abstract: A T-top apparatus for a boat is described in which the rigid framework of the T-top apparatus supports a built-in boat helm seat, seat backrest and other optional attachments. The rigid framework can be secured by bolts to the boat deck only, providing a convenient and effective manner in which to mount the T-top apparatus without requiring additional mounting hardware to fix the T-top structure to either the seat or center console helm. In an optional configuration, the T-top apparatus is formed in two sections with an upper section bearing the canvas roof and the lower section having the boat helm seat mounted therein. The upper section could be pivotally mounted to the lower section to permit the upper section to be pivotally lowered into a lowered configuration in which the overall height of the T-top apparatus is substantially at the same height of the boat helm seat.