Households in Birmingham, Sandwell and Solihull will be banned from meeting each other from Tuesday, the Department of Health has announced.
It comes as cases in Birmingham have increased rapidly.
According to NHS Digital data, the latest seven-day rate for Birmingham to September 8 showed 78.2 cases per 100,000 with 892 cases over the period - among the highest in the city since April.
Get the latest headlines: https://www.telegraph.co.uk/
Telegraph.co.uk and YouTube.com/TelegraphTV are websites of The Telegraph, the UK's best-selling quality daily newspaper providing news and analysis on UK and world events, business, sport, lifestyle and culture.