This study analyzes the possibilities of preserving the form and renovating the historic mosque with a wooden porch and minaret, based on the Osman Cehaja Mosque in Tuzla as an example. The research is based on direct observation of property over several decades and a comparison of formal qualities with other relevant structures of a similar type and period. Except for its foundation, no information is available on its past or potential interventions. It is only reasonable to assert that it was originally covered with a wood shake. It is assumed that its appearance has not changed since the early twentieth century, based on a common memory. The mosque was renovated four years ago. Analysis of the previous and current appearances showed that the complete renovation did not compromise its form. In this respect, it is feasible to renovate the mahalle mosque with a wooden porch and minaret while preserving its historical character. More challenging cases may necessitate more extensive investigation, planning, and experience.