Most of the jobs – 230 of the new staff – will be based in Swansea where Virgin Media opened offices in July 2012. They will be split across customer service and technical support.
Virgin Media's Manchester office will benefit from a further 90 engineering jobs and 40 customer service roles.
Virgin Media's regional headquarters in the West Midlands – opened in east Birmingham in October 2012 – will gain another 40 customer collection staff.
"We’re pleased we’re able to invest further and offer so many more people the prospect of an exciting and rewarding career at the forefront of next generation entertainment and communications,” said Paul Buttery, chief customer and networks officer at Virgin Media.
“With this expansion we will be even better able to support the government’s ambitions for the country. We’re investing in the very communities we serve to ensure all our customers get the experience they expect from us as we power Britain’s digital heartbeat.”
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The announcement won praise from central government. Business secretary Vince Cable said: “This expansion is good news for Virgin Media and for the hundreds of people who will benefit from these new jobs, which include many highly-skilled engineering roles.
“The digital communications industry drives growth and helps us to build a stronger economy. Today's announcement will also support our ambition to provide faster broadband – in both cities and rural areas – giving more businesses access to the opportunities they need to grow.”
Although Virgin Media offered no date when the hires would be made, it promised advertisements for the roles would be going out over the coming weeks.
Last week Virgin Media announced it was being acquired by US cable company Liberty Global for £15bn.