Nelson added that other MPs intended to show their support by writing direct to Nick Raynsford or the Treasury.
The Local Government Taskforce, a group set up to promote the Egan agenda at council level, has also indicated that it sympathises with the campaign.
In a letter to the CLG, Ted Cantle, chairman of the taskforce, said that it "concluded that retentions were not compatible with the collaborative approach to contract relations, such as partnering, which the taskforce advocates".
Retentions plague the specialist sector. We are determined to make our campaign a success
John Nelson, Constructors Liaison Group
The abolition of retentions, the system whereby a client or main contractor withholds a fixed percentage of a payment until after a job is finished, has long been an aim of subcontractors' trade associations.
Nelson admitted that the early day motion might be delayed by June's general election, but said the CLG was committed to ensuring it would be revived after. "Retentions are an issue that plagues the specialist sector. It may take some time but we are determined to make our campaign a success," he said.
Dundee West MP Ernest Ross also wants the Scottish parliament to consider the abolition of retentions, and the CLG is thought to be keen to take up the issue in Northern Ireland.