Sections of two central city roads will be closed for good to make way for Christchurch's new stadium

The city council is preparing the site for the 470 million dollar multi-use arena due to be unveiled by the end of 2024.

Cashel and Lichfield streets will be blocked between Madras and Barbadoes' intersections - initially to change street lights, cables and underground pipes.

Spokesman Alistair Pearson says traffic congestion is likely, but it's necessary.

Cashel and Lichfield streets are unlikely to reopen,.