Gesher, the Jewish special primary school, is moving ahead with plans to extend into secondary education next year.
Parents have been told that it will shortly advertise for a headteacher to develop secondary provision with the hope of being able to start offering it from September 2021.
The Willesden-based primary, which specialises in autism spectrum challenges, was ranked outstanding by Ofsted less than a year after it opened in September 2017.
In a letter to parents, Howard Zetter, the chairman of governors, explained the school needed to have an “appropriate property” to accommodate more than 100 students.