features over 2,000 products from the department store's range of bed linen, toasters, kettles and other home essentials. New products will be added each week.
The site aims to eventually house the same breadth and range of items as its flagship Croydon store.
The independent department store chain, established by Joshua Allder in 1862, was placed in administration six years ago with all but one of its 45 UK stores closing.
Fashion entrepreneur Harold Tillman, who owns Jaeger and is head of the British Fashion Council, bought the only remaining store, the original in Croydon, along with the brand name in 2005.
Andrew MacKenzie, CEO of Allders said: "The future of large department stores and high street chains is increasingly dependent on a strong ecommerce offering.
"When we bought Allders in 2005, all but one of its 45 national stores had been forced to close down.
"After six years of restoring profitability, we want to bring the brand back to every household in the UK, not by recreating the original stores but by developing an easy and affordable online shopping experience that everyone can enjoy a virtual department store."
MacKenzie said Allders' Twitter followers would be updated each week as it builds the ecommerce site and the brand will also run a Facebook page to enhance its social media presence.
A report from the Independent on Sunday last week claimed that talks had been held over the possible sale of Allders, which is 150 next year, by Tillman.
However, MacKenzie was quoted in the piece saying the brand had been approached but that it was not for sale.
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