To achieve enough variability for different performances, a number of new concert halls with secondary hard chambers coupled to the main floor have recently received positive evaluations. As a result, the acoustics of coupled spaces is drawing growing attention in architectural acoustics. In these coupled spaces, the sound energy decays with different exponential constants under certain conditions. For better understanding and control of the acoustics in coupled spaces an efficient measurement technique of identifying multiple decay times is therefore of critical importance. A Bayesian parameter estimation approach is applied to an algorithmic evaluation of decay times using measured Schroeders decay functions. This work discusses Bayesian analysis of systematic measurements in scaled‐down, coupled rooms and real coupled spaces.