The dissertation describes the research into the acoustics of sacral spaces whose aim was to determine their acoustic qualities. The measurements of objective parameters RT, EDT, C80, D50, TS and IACC were carried out, followed by listening tests in order to rate the subjective parameters Reverberance, Loudness, Intimacy, Clarity, Balance and Overall Acoustic Impression. Also the basic architectural parameters were measured in all the churches included in this research. Through the correlation of objective and subjective parameters significant dependence and high correlation coefficients were determined between objective parameters RT, EDT, D50 and C80 and subjective parameters Intimacy, Clarity, Balance and Overall Impression. Two new objective parameters were proposed for the evaluation of acoustic properties – the specific RT (denoted as RTS) and specific EDT (denoted as EDTS). Both specific parameters show higher correlation coefficients with subjective parameters than the regular RT and EDT. Very significant correlation and verified linear regression models between objective parameters RTS, EDTS and C80 and subjective parameter Overall Impression have led to defining a method of evaluation of objective acoustic parameters of sacral spaces. Four categories of acoustic quality of sacral spaces are proposed based on the rating of the subjective parameter Overall Impression. This model enables us to assess the subjective acoustic quality of churches without the need to perform the listening tests, which is useful both in assessing the acoustic quality of existing churches and in the design of new sacral spaces.