Tomorrow’s announcement by George Osborne will also contain further spending promises for projects – but they will be long term plans of little immediate benefit to construction companies.
Total figures of up to £30bn have been suggested but contractors will concentrate on work set to start imminently.
The extra £5bn of investment will be found from current spending cuts as the Government sticks rigidly to its deficit reduction plans.
The money will help fund the revised National Infrastructure Plan in the current period to 2014/15.
An extra £5bn will be found for the following three year period and £20bn of private cash under a new deal struck with pension funds to fund schemes like toll roads.
The Plan will include 40 top priority projects alongside a longer wish list of 500 schemes.
Some of the initial £5bn will help fund a £600m school building programme planned before 2014.
Other priority schemes will include the TransPennine express line between Leeds and Manchester, the Metro system in Tyne and Wear and improvements to the M25, M56 and M3.
Construction companies will also benefit from proposals to unlock £40bn of bank lending to small businesses by underwriting loans with Government guarantees.