An independent inquiry into NSW's bushfire season will start within days, focusing on the impact of climate change, fuel loads and drought as well as the role of hazard reduction.

Premier Gladys Berejiklian will announce on Thursday that former NSW Police deputy commissioner Dave Owens and former NSW chief scientist Mary O'Kane will head the six-month inquiry.

An independent expert inquiry into NSW's devastating bushfire season will start within days. Credit:Wolter Peeters

The inquiry, which will not hold public hearings but will accept submissions, will review the causes, preparation and response to this summer's bushfires which have killed 25 people in NSW.

Ms Berejiklian said recovery efforts were ongoing and remained the government's focus.