Impressed by the commitment of the membership, he persuaded the engineers in Colombo and other cities to moot a similar professional body.

[4] Presided by the Governor of Ceylon Sir Henry Blake,[5] the inauguration of the Association was held on the January 6th 1906 within the hallowed precincts of the Legislative Council of Chambers.

[8] When in 1972, the country itself changed its name to reflect its historic annals and eastern roots to become a republic, the Institution of Engineers adopted Sri Lanka to replace Ceylon.

https://www.iesl.lk/index.php?option=com_content&view=article&id=140&Itemid=417&lang=en In June 2014, the IESL was admitted to the Washington Accord, on a unanimous decision made by the signatory countries at the 2014 International Engineering Meetings held in Wellington New Zealand.

Sri Lanka now becomes the sixteenth signatory to this Accord, joining Australia, Canada, Ireland, the US, UK, New Zealand, Russia, South Africa, Japan, South Korea, Hong Kong, China, Taiwan, Malaysia, Singapore and Turkey as a Washington Accord Signatory Country.

[10] In 2018, IESL along with the GMOA has objected and criticized the Government of Sri Lanka for entering into a Free Trade Agreement with Singapore.