New EU directive
Agency workers will receive the same pay and conditions as permanent staff under proposals announced by the Government.
About 500,000 agency workers will benefit from the proposals
The rights will take effect once agency workers have spent 12 weeks in a given post, as part of the Government's implementation of an EU directive.
Employment Relations Minister Pat McFadden said: "These proposals will take us another step forward by boosting the rights of agency workers, while making sure both employers and agency workers have the flexibility they need. "In both good times and bad it is vital that we give people a fair deal at work without damaging our flexible labour market and putting jobs at risk."
The proposals follow a fraught deal reached last year between the Trades Union Congress and Confederation of British Industry.
The new laws must provide real protection for temps, and any legal loopholes which would allow unscrupulous employers to avoid the law and to undercut reputable firms must be closed
TUC general secretary Brendan Barber
The TUC and CBI are both urging the Government to carefully think through the plans
John Cridland, deputy director general of the CBI, said: "Agency working is important for the UK economy and we mustn't undermine it with clumsy regulation", he said.
However, TUC general secretary Brendan Barber welcomed the proposals as "good news for agency workers", and argued for tough regulation to protect agency worker rights.
"The new laws must provide real protection for temps, and any legal loopholes which would allow unscrupulous employers to avoid the law and to undercut reputable firms must be closed," he said.