It’s the online onslaught that will have major supermarkets and electronics retailers nervous.

Costco is putting up the exterior frame of its giant Kemps Creek distribution centre – a warehouse the size of 17 football fields that will service all their stores nationally as well as online.

The $78 million facility will be completed in March next year with the American retailer going online soon after that. Nine News has been given an exclusive first look at the construction, and for the first time, we can show you the sheer scale of it. It will create close to 1000 jobs for Sydney’s west.

Right now, if you don’t live close to one of its three Sydney stores, the $60 annual membership can be a stretch.

But if you can order online and have it delivered to your door, it’ll change the way Australians think about shopping.

“Everything we do makes people change. The warehouse concept wasn’t here 10 years ago so we’ve had some impact on the retail scene,” Costco Australia General Manager, Patrick Noone, told Nine News.

Costco is putting up the exterior frame of its giant Kemps Creek distribution centre. (9News)

It's a warehouse the size of 17 football fields that will service all their stores nationally as well as online. (9News)

You’ll still need to be a member of Costco to shop its online store. While you’ll be able to buy everything from toilet paper to televisions, they’re expecting to have special online only offers around home appliances, furniture and other big ticket items.

Its US site has varying delivery fees from an added fee on large items to inbuilt fees on grocery products.

Mr Noone says it’s too early to say what model will be used here but they’re looking at adopting the most effective model from their overseas sites.

“We’ll look at either rolling it into the price or adding it on top,” he said of the delivery fees.

“It’ll make Costco available for everyone in the country from Perth to Darwin to Hobart.”

The $60 membership fee will not increase with the opening of the online store.

Ultimately Costco’s goal is to increase buying volumes and lower prices further for its members.

The $78 million facility will be completed in March next year. (9News)

It will create close to 1000 jobs for Sydney’s west. (9News)

While the arrival of Amazon in Australia came with much hype, it failed to live up to it and has had a lacklustre start to business here.

Retail analyst Neil Rechlin, partner at the NextGen Group, expects Costco online to be far more successful and have a bigger impact not just on our supermarkets, but on retailers such as Harvey Norman and JB HiFi.

He believes the online offering will put downward pressure on prices across the board.

“The size of the basket Costco sells means they can make home shopping work versus Woolworths and Coles, and then the Harvey Normans, the JB HiFis and Good Guys will be put on notice on price points on electricals.

“All the innovation in the market is putting downward price pressure on groceries, electricals, household goods. This will be another large downward pressure on price.

“Definitely a win for the consumer, increased choice and better prices.”