Two properties have partially collapsed after heavy erosion at Wamberal on the NSW Central Coast.

Residents of Wamberal are surveying the damage after another night of wild seas.

Both buildings damaged overnight are understood to include holiday homes of Sydney residents.

The owner of a unit in one of the damaged blocks has had the property for eight years.

Her unit is on a floor above the collapsed ground floor corner.

Neighbours informed her of the damage this morning and she is understood to have been distraught.

Fire and Rescue have since cordoned off the homes and residents were being forcibly evacuated on Saturday.

A third property, home to the Cahill family, has suffered significant structural damage over the recent days of heavy surf.

The balcony collapsed on Thursday late afternoon during the high tide.

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Matilda Cahill, 18, has lived at the house since she was 10 months old.

She and her father, Gordon, are packing their bags to leave the family home on Saturday afternoon.

"They're forcing everyone on the street to evacuate," she said.

"There will be no power, no water they're turning it all off we dont have a house to go to but we've got to go," she said.

"It's a bit scary but insurance is there for a reason, I guess."

Many residents lost metres of grass overnight, while others have seen their balconies topple more than 10 metres down cliffs into the sea below.

Engineers continue to assess properties ahead of the next high tide at 7:00pm tonight.

Last night police advised residents to leave, with most heeding the warning.

Residents claim they have long been attempting to build structures to protect properties but have been blocked by the Central Coast Council.

The powerful surf conditions were caused by a low pressure system that moved in this week, but which fell short of being declared an east coast low.

In response to the dangerous system, the Bureau of Meteorology issued a hazardous surf warning for the NSW coast.

The warning remains in place on Saturday for Byron Coast, Coffs Coast, Macquarie Coast, Hunter Coast, Sydney Coast, Illawarra Coast, Batemans Coast and Eden Coast.

"Surf and swell conditions are expected to be hazardous for coastal activities such as rock fishing, boating and swimming," the BOM warned.

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Buildings partially collapse after another night of raging seas on the NSW Central Coast - ABC News