Micci Hatch and Hamish Guthrie have known each other since they were in preschool and as they watched Prime Minister Scott Morrison's announce that weddings would be part of new nationwide restrictions in a bid to curb the spread of COVID-19, they knew they had to do something.

"I looked at him and said 'Hamish, do you want to get married tomorrow?' and he said 'why not'," Ms Hatch said.

The couple, from Blayney in the NSW Central West, were already engaged and were to be wed on April 18, and didn't fancy the five-person restriction.

"We decided at 9.30pm on Tuesday and we got married at 3.30pm on Wednesday," Ms Hatch said.

"We called our parents at 9.40pm and their first reaction was 'we're going to be there'."

Luckily, Ms Hatch already had her wedding dress and the couple had also decided on a venue - The Macarthur Rose Garden at Old Parliament House in Canberra.

"Both sets of parents were there, my bridesmaid, and then two of Hamish's colleagues," Ms Hatch said.

"One of the colleagues, who is in marketing and communications, volunteered to film the wedding and my sister created a Facebook page so we could livestream it.

"I had all my friends and family there watching it."

The nuptials may have been far from what the couple had planned, but as it turned out, Ms Hatch said it was her "dream wedding".

"It was really nice and intimate and there was a huge amount of humour in it," she said.

The couple couldn't enjoy a honeymoon or even have a breakfast out the day after due to government regulations.

"We're spending our first day as a married couple in self-isolation," Ms Hatch said.

"We figure if you can plan a wedding in 18 hours, you can survive anything."