The genesis of a legislature in Barbados was introduced by Governor Henry Hawley, creating a structure of governance to Barbados, itself patterned after the Parliament of England). The then unicameral Parliament originally was tasked with establishing a system of laws and was completely under the domination of the island's planter-class. The first meeting of the Barbados Assembly was held in 1639.

The initial location known as the "Sessions House" which was situated in the Marlhill, which is now known as Spry Street. Built by Captain Henry Hawley, the building may have originally accommodated his Courts of Law. (On 25 June 1989, a monument was unveiled to commemorate the site outside of the current Central Bank.)

By 1653, the Assembly moved to the State House then located in Bridgetown area known as Cheapside (then encompassing Broad Street). In 1668 the State House was destroyed by a great fire started by an explosion of the Bridgetown military magazine. Over the next century, the colony’s elected officials assembled at various locations all over Bridgetown, which were rented taverns and homes of local merchants and landlords. The Roebuck Tavern located on Roebuck Street was a favourite assembly point and was also owned by Henry Hawley. The movement of the Assembly among the various taverns in the town eventually presented an irony for the thriving colony. Governor Atkins, who was attending a meeting at Gwynn’s Tavern in 1674 commented, "I must confess I am a little astonished to see so honourable an Assembly to meet in a place so considerable as the island is, and have no house to receive us but a public tavern" (TOB 71). For many years the Barbados Assembly continued to meet in various places. In 1724 an Act was passed providing for a building for the Council and Assembly, Law Courts and gaol. The building located on Coleridge Street was completed in 1731-1732, yet the House of Assembly still often met at times at different private houses and taverns. The current Parliament Buildings were built in the neo-Gothic style in the early 1870s on the site of what was known as the "New Burnt District", which was part of a 10-acre area in the town that was destroyed by the great fire in 1860.

The Parliament of Barbados in its current form was first introduced following the 1961 general elections. In 1963 the colonial era Legislative Council was disestablished. In its place came the Senate in 1964 (due to Barbados' status as a colony of Great Britain). As the years went by, governance in Barbados continued to change in structure until both of the present chambers assumed their present numbers.