Bert served the company for over forty years, in which time he extended the services of the business to include heating, ventilation and air conditioning.

This significantly expanded the scope of the business and enabled it to take on larger projects.

By the end of the twentieth century, AE Smith gained significant recognition as a mechanical services company after taking part in many landmark projects involving shopping centres, hotels, universities hospitals in the city of Melbourne.

This success resulted in a new branch being opened in Hobart in 1967, followed by offices in Brisbane, Gold Coast, Sydney, Mackay, Townsville, Perth and abroad in Auckland, New Zealand.

In February 2015 Spotless Group Holdings acquired AE Smith in order to strengthen their capabilities in air-conditioning and mechanical services.