[1] Politicians John Winthrop Hackett and George Leake favoured the Harvest Terrace site, which was eventually chosen by Parliament.

[1] An Australia-wide competition was held for the design of Parliament House, adjudicated by the government architect of New South Wales.

[1] A large general room for members and a library were added to the initial design during construction, which was completed in 1904.

[1] The building opened on 28 July 1904, and The West Australian commented:[1] When the assembly members trooped into the Council Chamber to hear the Commission read, the visitors had time to criticise the extraordinary colour scheme of the Assembly Chamber, count the hundreds of black swans swimming in the blue sea of carpet, comment on the dizzying height of the galleries, and draw comparisons – born of the wearying display of stained glass and coloured wood – between the general appearance of the Chamber and that of a glorified saloon [...].The eastern (city) wing was added between 1958 and 1964 at a cost of £A 416,500,[3] equivalent to A$13.1 million in 2022.

During the 1980s, uneventful proposals were put forward to extend the structure eastwards by covering the adjoining Mitchell Freeway, incorporating commercial development, and connecting the Parliament House precinct with St Georges Terrace.