A travel broker says more capacity in MIQ is going to help, but it's just the tip of an iceberg.

Space in MIQ facilities dried up after a holiday surge in demand, but authorities have made about 100 more rooms a day available, between December 13 and 23.

They'll be offered on a first come, first served basis.

Travel broker Mark Hutchinson told Kate Hawkesby demand is definitely exceeding supply.

"Christmas and New Year is a busy time and people need to travel - often at short notice - so more supply is a big thing."

Hutchinson says with the voucher system coming into play, his company put together a team to help people juggle their flight and isolation bookings.

He says he'd like to see those working at the coalface communicate better with travel agents.

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