Common mistakes in bathroom remodeling include underestimating the budget, which can lead to unexpected costs. Poor planning, like neglecting ventilation or not considering water efficiency, can result in long-term issues. Choosing aesthetics over functionality, such as improper lighting or storage, can reduce comfort and usability. Failing to hire a qualified contractor can lead to shoddy workmanship. Lastly, neglecting to account for the bathroom’s layout and space can make the remodel less practical and inconvenient.