It sits in the Legislative Assembly Building on Civic Square, close to the centre of the city of Canberra.

[2][3] Members are elected for four-year terms by the Hare-Clark system, a variation of the Single Transferable Vote form of proportional representation.

It also includes all of the ACT which is south of the Murrumbidgee River, thus making it the largest electorate by area.

Electing five members to the Assembly, Ginninderra contains the town centre and all of the suburbs of Belconnen excluding Giralang and Kaleen.

[15] In 2014, the Assembly voted to expand the number of members to the present 25, with the change taking effect at the 2016 election.

[16] There has only been one majority government in the history of the Legislative Assembly, with Labor winning 9 of 17 seats at the 2004 election.

The Governor-General, on the advice of the Executive, previously had the power to override laws passed by the Assembly.

[18] The ACT is unique among Australian states and self-governing territories, as it has no vice-regal post exercising authority as the representative of the monarch, such as a governor or an Administrator.

The functions vested in a state Governor or territorial Administrator as nominal head of the Executive—commissioning government, proroguing parliament and enacting legislation—are exercised by the Assembly itself and by the Chief Minister.

Instead of vice-regal or regal assent, a Bill passed by the ACT Legislative Assembly is enacted on "notification"—publication in the Government Gazette of a notice authorised by the Chief Minister.

[19] However, the Governor-General of Australia does have the power to dissolve the Assembly if it is "incapable of effectively performing its functions or is conducting its affairs in a grossly improper manner".