It could mean substantial growth in green building materials for London's merchants despite anticipated cuts in government spending.
A much bigger and faster London-wide programme to upgrade the energy performance of all homes could create up to 15 000 new jobs for builders' merchants, builders, joiners, plumbers, electricians, roofers, heating and structural engineers.
However, the scheme will need significant public investment to get started, as the private sector is not yet stepping in. Mr Johnson is calling for a huge increase in environmental investment in London to achieve his climate change and air pollution goals.
Mr Johnson wants the government to have spent £800m on incentives to switch to low-carbon vehicles by 2018, even though current spending plans only amount to £260m. He wants £2bn-3bn for the installation of decentralised energy schemes between now and 2015, through a mixture of public and private money.
His plans to improve the energy efficiency of London homes are largely dependant on finance from central government, requiring at least £193m of public money between now and 2015. Mr Johnson's advisors have revealed that London needs £70m-90m from the government to fund mayoral air pollution initiatives within the capital, as well as government needing to spend directly an additional £200m between now and 2015 to reduce air pollution to within European legal limits.