Birth, marriage and change of name documents can be replaced free from the NSW Registry of Births, Deaths and Marriages.

"The registry will co-ordinate the replacement documents on a customer's behalf, regardless of which state or territory in Australia, or New Zealand, they were born, married or changed their name," a government statement said.

Replacement driver's licences, boat licences and photo cards will also be available, as will Fair Trading licences and owner-builder permits for those who have to rebuild or repair their home due to fire damage.

READ MORE: South Coast fires live blog

Service NSW is sending out buses that will serve as mobile officers to bushfire-affected communities.

A bus will be at Dickinson Park, Bermagui on January 13, Arthur Kaine Drive in Merimbula on January 14, Railway Avenue, Bundanoon, on January 21 and Ryrie Park, Braidwood, on January 22.

The buses will not accept cash, with payment only to be made by cheque, EFTPOS or credit card.

Also, people in bushfire-affected areas looking at emergency websites on their mobile phones won't need to worry about going over their data limit.

"People's lives are already stressful," said NSW Customer Service Minister Victor Dominello, "which is why we have worked with telcos to ensure affected customers don't risk incurring extra fees or slower coverage for making additional calls and using more data when accessing emergency information sites."

The sites people can access for free include the NSW Rural Fire Service, NSW Office of Emergency Management, the Bureau of Meteorology, ABC News and the Red Cross.

The unlimited access does not include mobile phone apps.

For more information on the services offered to those dealing with bushfires visit https://www.service.nsw.gov.au/assistance-bushfire-affected-communities.

Those requiring emergency assistance such as food, water or shelter should contact the Disaster Welfare Assistance line on 1800 018 444.