Premier Gladys Berejiklian will prioritise an overhaul of planning laws in 2020 with a push to create 30-minute cities to ease congestion on public transport, roads and in Sydney's CBD.

In a speech to the Committee for Economic Development of Australia (CEDA) on Wednesday, Ms Berejiklian will outline a vision for the state’s planning system, which will be her focus next year.

Premier Gladys Berejiklian's focus in 2020 will be overhauling the state's planning laws. Credit:AAP

Her State of the State address will outline what the government will change, including reducing assessment timeframes and making e-planning mandatory for metro councils.

The government will also "supercharge" new hubs to ensure people can live close to their work as well as fix the uncertainty of developer contributions.