Designed by architect Hawkins\Brown, the £45m project will provide the 66-year-old headquarters building on Wood Green High Road with a new annexe, offices, and restored civic spaces.
The building was the first civic centre of its size to be built after the Second World War and was listed in 2018.
The revamp, which will also upgrade the building’s energy performance, will see the building’s extensive precast concrete panels replaced with glass-reinforced concrete of the same colour.
Firms have until 4 December to return PQQs. For bid documents click here.