Vapiano is to spend £2m refurbishing its flagship Great Portland Street restaurant.
The London site, which is the group's busiest in the world, will close for six weeks for the work which is expected to be completed by early March.
Vapiano operates four UK sites, three in London and one in Manchester, while there are 175 sites worldwide. They all serve fresh, handmade pasta prepared by chefs in front of diners in an open kitchen.
Serving 15,000 guest Great Portland Street is the busiest Vapiano site in the world. It employs five pasta chefs who cook two bespoke dishes at a time, from a choice of 11 types of pasta and numerous sauces, in front of customers.
Guests are given a chip card chip card on arrival which registers their food and drink, meaning individual diners pay on the way out without having to split the bill.
Phil Sermon, managing director Vapiano UK and USA, said: "When you run a successful restaurant like Vapiano, it's absolutely worth the investment to keep it in order, for the benefit of both staff and guests. This refurb will bring our busiest restaurant, not only a fresh new design but additional pasta stations, pizza ovens, a re-fitted bar and extra covers."
The Great Portland Street site will be designed by regular Vapiano suppliers Finkernagel Ross.
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