Sound transmission characteristics of single or multiple panels as sound insulation components in buildings have been studied extensively, and numerous models have been developed over the past few decades. Though most of them have been validated individually with specific test results in their developing phases, evidences showed that considerable discrepancy exit from one model to another. By applying many existing models onto glazing panels such as windows, doors or building facades, the authors found that most of them unable to accurately predict their sound insulation performance. Apparent discrepancy up to 3-5 dB in terms of OITC/STC index were even found between the predictions by commercial software and those well recognized test results. Obviously, more accurate theoretical models are highly demanded in industry to guide the design of real practice. To address this urgent need, revisits of most existing theoretical models were made by the authors, and extended models are accordingly developed and presented in this study in order to provide more accurate predictions on the acoustic performance of monolithic or laminated single- and double-glazing panels. Test results collected from literature as well as conducted by the authors are further provided to validate the proposed models.