Greenpeace UK is joining forces with UCATT, the British construction worker's union, to launch the next phase of its ancient forests campaign.
The charity wants all UK construction companies to stop buying timber that supports the illegal logging trade and contributes to the destruction of the last remaining ancient forests.
UCATT has written a report urging companies to buy only timber certified by the Forest Stewardship Council.
Greenpeace UK says the report is vital in its fight to preserve ancient forests because the UK is the largest importer of illegal tropical timber in Europe.
As the public sector accounts for 40 per cent of UK timber use, Greenpeace UK is also calling for local government and government-funded bodies and projects to adopt green procurement policies.
"The construction industry is often criticised for its approach to the use of natural resources," said George Brumwell, general secretary at UCATT.
"This initiative is an opportunity to silence these critics and prove that everyone within the industry can contribute to sustainable development."