Opposition water spokesman Chris Minns will contest the NSW Labor leadership at a special caucus meeting tomorrow, running on a platform of "bold policy change" for the state.

Mr Minns said his focus as Labor leader would be on planning laws, dumping the lock-out laws and ensuring the NSW economy was safeguarded against a downturn in the housing market.

Planning spokesman Michael Daley is the frontrunner to seize the leadership, and has the backing of NSW Labor's general secretary Kaila Murnain. But Mr Minns believes his ideas could swing some MPs.

After arriving to announce his leadership at The Domain with his wife Anna, Mr Minns said would dump planning laws that are ruining “the most beautiful city on earth”.