Member for Port Macquarie Leslie Williams and Member for Oxley Melinda Pavey will remain in isolation for the advised 14 days despite returning a negative COVID test.

Parliament House in Sydney was sent into lockdown on June 24 after Northern Tablelands MP Adam Marshall tested positive for COVID.

The Agriculture Minister was notified by health authorities of a possible exposure after he dined at a Sydney pizza restaurant on Monday night.

Many state MPs were deemed close contacts and hundreds of people working in the building on Sydney's Macquarie Street this week were at risk of exposure.

Mrs Williams was contacted by NSW Health on Thursday evening after receiving her negative test result, advising she is classified as one of those close contacts.

"I will be isolating until July 6 and will continue to follow advice from NSW Health," Mrs Williams told the Port News on Friday (June 25).

Mrs Pavey will return to her electorate and remain in isolation for the same period.

She has been in Sydney since Monday and confirmed she was present at a Nationals' Budget dinner on Tuesday night, where Mr Marshall attended.

Ms Pavey said she will be guided by the expert opinion of NSW Health.

Both Mrs Williams and Mrs Pavey urge residents in their electorates to take the vaccination program seriously and do their part to help prevent further spread of the virus.

"We all have a role to play to contain this virus," Ms Pavey said.

Developments this week had major ramifications for NSW Parliament. The opposition's Budget reply speech has been cancelled.

On Friday (June 25), Premier Gladys Berejiklian announced NSW will enforce a lockdown for four Sydney council areas as the state records 22 new local cases of COVID-19.

The Premier presented the numbers after a crisis meeting to review the growing amount of cases across the state.

People who live or work in Woollahra, Waverley, Randwick and the City of Sydney will not be able to leave home for a week except for essential purposes.

These include work or education, shopping, providing care or outside exercise.

"If you live or work in those local government areas, you need to stay at home unless absolutely necessary," Ms Berejiklian said.

There are now 65 cases linked to the Bondi cluster that erupted in the city's east last week.

NSW Police Commissioner Mick Fuller said ahead of the school holidays, police will be ramping up COVID restrictions compliance enforcement.

"Everyone needs to follow the rules; we have taken a fair approach in terms of writing tickets throughout the COVID pandemic," Commissioner Fuller said.

"But in the last 24 hours, we have ramped up enforcement and seven people have been issued Penalty Infringement Notices for not wearing masks and the number of cautions has dropped dramatically.

"The Traffic and Highway Patrol Command will be patrolling the outskirts of the Greater Sydney area and if you are outside of that when you are not meant to be, then you'll be given a ticket. The maximum penalty of which can be up to $11,000 for individuals and $50,000 for corporations.

"This is a difficult time for everyone, but we've got to listen to the Premier, follow her messages and the advice of NSW Health."