
The devastating impact of two king tides on properties in Sydney's northern beaches has been revealed as homeowners - who stand to lose up to $675,000 - return to survey the damage.

Aerial photographs from before and after Sunday's massive storm show the damage nine beachfront homes in Collaroy sustained, including front yards, swimming pools and balconies crumbling into the ocean.

Valuers said the Pittwater Road properties would have been worth between $2.2 million to $4.5 million before the storm. In just hours, the properties' values would have plummetted by 10 per cent to 15 per cent after raging seas carved off up to 15 metres of the coastline and cause extensive damage.

Scroll down for video

Nine properties (pictured with market values prior to the damage) on Pittwater Road, Collaroy in Sydney's northern beaches were smashed by the king tides

Devastating before and after (pictured) images of the impact of two king tides on properties in Sydney's northern beaches revealed

That represents a drop in value of between $330,000 and $675,000, depending on the value of the house.

'I'd be very surprised if they were going on the market in the short term,' PMS Property analyst James Freudigmann told Daily Mail Australia.

'I think to understand the difference in value will take 12 to 18 months for one or more sales to occur and determine the difference.

'The Sydney market has had such strong growth and then this has occurred - it might make buyers a bit more wary'.

The nine homes, with a combined value of just over $28 million, are build on sand banks and are not expected to survive another king tide thrashing.

Photos of the exteriors of a few of the affected houses prior to the damage, show just how close the balconies and front gardens come to the water's edge.

The multi-million dollar properties are set to experience a fourth night of battering, with an 'abnormally high tide' predicted for Tuesday night.

Seven beachside homes and a unit block at Collaroy were evacuated on Sunday night during the state's wild storms as eight-metre waves slammed the coast, washing away backyards, balconies and a swimming pool.

Photos of the exteriors of a few of the affected houses prior to the damage, show just how close the balconies and front gardens come to the water's edge

Before the damage, this property was worth around $2.875 million but may have more than $500,000 shaved off after extensive damage

This home, just metres from the water's edge, was worth just over $2 million before ravaged by the storm

Residents have not been allowed back as structural engineers inspect the beachfront homes

One Pittwater Road resident, Tony Cagorski, lost 15 metres off the back of his $2.5 million home due to the storm, which entirely swallowed his back yard

Nine properties (pictured prior to the damage) on Pittwater Road, Collaroy in Sydney's northern beaches were smashed by the king tides

Residents have not been allowed back as structural engineers inspect the beachfront homes, and the Bureau of Meteorology says another 'significant' tide is set to hit on Tuesday at 10.30pm.

The high tide won't be as big as Sunday night's but will be an 'abnormally high tide', said BOM spokeswoman, Helen Kirkup.

Storms lashed the east coast of NSW over the weekend, with Sydney's northern beaches one of the areas worst affected.

About 700 properties at nearby Narrabeen were evacuated during the weekend's wild weather but on Monday they were deemed safe for people to return home.

However, many of the beachfront Collaroy homes are not likely to be insured against damage from the sea, said the Insurance Council of Australia (ICA).

Most housing insurance policies don't typically cover 'actions of the sea', which includes coastal erosion, king tides or storm surges, said Mr Fuller in a statement.

'A small number of policies on the market will cover actions of the sea under certain conditions,' he said in a statement.

'Ninety-three per cent of all new home insurance policies purchased in Australia now include cover for flooding (under the standard definition), but neither actions of the sea nor the effects of gradual sea level rise are considered to be flooding for insurance purposes.'

Valuers said the Pittwater Road properties would have been worth between $2.2 million to $4.5 million before the storm

Most housing insurance policies don't typically cover 'actions of the sea', which includes coastal erosion, king tides or storm surges, said Mr Fuller in a statement

Storms lashed the east coast of NSW over the weekend, with Sydney's northern beaches one of the areas worst affected

However, many of the beachfront Collaroy homes are not likely to be insured against damage from the sea, said the Insurance Council of Australia

Photos of the exteriors of a few of the affected houses prior to the damage, show just how close the balconies and front gardens come to the water's edge

So far insurers have received more than 11,150 claims across Queensland and NSW, with estimated insured losses of $38 million and the figure is expected to rise

So far insurers have received more than 11,150 claims across Queensland and NSW, with estimated insured losses of $38 million and the figure is expected to rise.

Northern beaches residents spent Monday morning walking up and down the debris-littered beach taking photos and surveying the damage. One said it was 'as if a tsunami had hit'.

One resident, Tony Cagorski, lost 15 metres off the back of his $2.5 million home due to the storm, which entirely swallowed his back yard.

The 55-year-old sneaked into his property early this morning to survey the damage before police removed him insists he won't give up without a fight.

'It's an emotional time for us, this is our baby, we have to be allowed to go in and try to save our home – I am hanging in but we need help,' he told Daily Mail Australia.

Mr Cargoski has insurance on the home but is uncertain whether the policy will be honoured because of confusion over storm clauses.

'I really am not sure if we are okay.'

He bought the property just 12 months ago because it was the family's dream to live by the water.

Northern beaches residents spent Monday morning walking up and down the debris-littered beach taking photos and surveying the damage. One said it was 'as if a tsunami had hit'

Aerial photographs from before and after Sunday's massive storm show the damage nine beachfront homes in Collaroy sustained, including front yards, swimming pools and balconies crumbling into the ocean