The 1100 was the result of "Project 928", started in 1962, finalized by engineers Philippe Grundeler and Charles Scales. The design was a result of Simca's market research in the early 1960s, which showed the increasing popularity of front wheel drive cars that provided better space utilization and comfort to small cars. In Spring 1962, Simca targeted a 1966–67 launch of a new range of front wheel drive cars with sedans, wagons, and light commercial vehicles to be included, all fitting into France's 6CV tax class – between the Simca Mille and Simca 1300. Both transverse and front/back engines were tested, and in 1963, the transverse-engine design was approved. The Simca 1100 was one of the first designs outside Fiat to feature a transverse engine with an end-on gearbox and unequal length driveshafts (now near-universal amongst small cars), a possible result of Fiat influence as a major shareholder.
In 1963, Chrysler took a controlling interest in Simca, approving the project in 1964, with a production target of summer 1967. The short timetable included developing a new transmission, and using a larger version of the rear engined rear wheel drive Simca Mille (Simca 1000) engine, displacing 1118 cc (the Mille used a 1.0 litre engine, the 1500 a 1.5 litre engine).