In 1931, it was bought by, and prospered under, Howard & Wyndham Ltd[1] which had been formed at the Theatre Royal, Glasgow in 1895 by Michael Simons.

[2][3] The group's managing director A Stewart Cruikshank, headquartered at the group's headquarters in the King's Theatre, Edinburgh, was joined on the board by Charles B Cochrane who now became a visiting producer at the Opera House, premiering numerous musicals and revues.

Its symmetrical fifteen-bay façade is in the classical style with a five-bay centre with fluted Ionic columns.

The high ceiling above the auditorium takes the form of a coffered segmental tunnel vault.

[5] The theatre was redecorated in March 2011 keeping the green and gold colour scheme of the auditorium unchanged.