It has been renovated numerous times, most notably in the late 1970s when the state government purchased it and performed an ornamental restoration whilst modernising the facilities provided.

At the turn of the 20th century, Perth was experiencing a period of high growth as a result of the Western Australian gold rush.

[5][10] During construction, questions were publicly raised about the stability of the building's foundations in light of the water table on the site and the presence of a subterranean stream.

[10] Liebe conferred with the architect and engineers before developing a revised design which featured drains to divert running water.

[12] When the time finally came for Molloy to pay Liebe for the construction, a dispute arose as to who should be liable for the extra £A 17,000 (equivalent to A$3 million in 2022) incurred in remedying the structural defect.

[7][13] Molloy was reputed to be one of the most litigious businessmen in Perth,[14] and refused to pay higher than the original agreed price,[13] on the basis that the contract required his written approval for extra work to be carried out.

[16] The building used 272 tonnes (600,000 lb) of iron and steel, 3.75 million locally made bricks, imported marble, Minton tiles and Castlemaine slate.

Four small waterfalls[17] were located on either side of the proscenium arch, intended to cool the audience[16] in tandem with electric fans and a retractable dome in the ceiling.

[21] During World War II, the theatre functioned chiefly as a cinema due to travel restrictions on touring companies.

[6] Original proprietor Thomas Molloy leased the theatre to others, including Ben and John Fuller, and local producer Anita Fitzgerald.

[23] The latter renovation included new backstage electrical fittings and may also have been the time the verandah balconies were removed from the street frontage of the theatre.

[1] Adhering to an April 1974 election promise to retain and restore the theatre in conjunction with a new Art Gallery and Cultural Centre, in 1977 the Charles Court Coalition Government undertook a $10.5 million refurbishment.

[28] However, architect Peter S. Parkinson resisted this push to fundamentally alter the design of the theatre and a sympathetic restoration was instead favoured.

[1] A separate building was constructed to the rear of the theatre to house new dressing and rehearsal rooms, as well as a new air conditioning system.

[17] The former Sportsman's Bar of the hotel was converted to function as the theatre's new box office, and the side entrance from King Street was made an emergency exit.

[30] The favoured option was to establish a trust to operate it, which could focus on best serving the arts rather than worrying about commercial viability of productions.

[30] However, on 8 February 1979, Premier Court announced that His Majesty's would be run by TVW Enterprises Ltd, the owner of the rival Perth Entertainment Centre.

[16] His Majesty's Theatre has long been recognised as an important piece of Western Australia's history: in 1978 it was entered onto the Register of the National Estate.

[32] The theatre was named a State Heritage Icon in December 2004,[29] and since February 2001 has housed a Museum of Performing Arts.

[33] In 2008, Savcor (a company which specialises in restoration techniques for concrete and steel) was contracted to do a detailed survey of His Majesty's Theatre.

[34] In December 2021, renovation work began to reinstate external balcony structures and return the 118-year-old building to its original façade.