The cathedral was built in the early English style, constructed with red brick and locally cut sandstone facings. The aisles are low with an attracting clerestory below. Gell's parish church terminated at the end of the nave with a small temporary chancel until such time as funds would allow for a more suitable sanctuary to be built. Over the next hundred years, the cathedral underwent several expansions. An adjoining convent complex appeared in about 1895. In 1897 the temporary chancel was replaced by a larger one more in keeping with the cathedral's status and it was at this time that the east windows and marble altar were also installed. In addition several structures were erected on the north side between 1897 and 1922. In honour of its centenary, the cathedral was extensively renovated and enlarged during 1960. As the mother church of one of the oldest dioceses in New South Wales, the cathedral has seen many changes over its lifetime making it truly a historical document in stone. In spite of all the changes however the cathedral is today substantially the same imposing building planned and built by Fr Dean Grant as his visionary 'cathedral' for Bathurst over a century ago.