John Lewis Partnership chairman Sir Stuart Hampson has said the retailer is willing to share the Sustainable Construction Framework it published last week with the rest of the industry.
Sir Stuart said the framework, which had taken 18 months to produce in collaboration with sustainable development charity Forum for the Future, was "too important" for JLP to keep to itself.
"We offer it to all of you," Sir Stuart told delegates at the Retail Week Conference in London this week. "Normally we wouldn't want to share anything we thought was a good idea, but this is too important."
John Lewis has 26 department stores and 183 Waitrose stores, and has pledged that by October 100% of its energy will come from renewable sources.
JLP plans to double in size over the next decade, opening at least 10 more John Lewis stores, all of which will be constructed in a sustainable manner.
Sir Stuart cited the £60m refurbishment of the group's Oxford Street store in London as the blueprint. "We have reduced CO2 emissions (at the store) by 1,300 tonnes a year," he said.
He applauded the "outbreak of consensus" from retailers that have published green manifestos, but warned it was "high-risk territory". "Promises have to be delivered. Those who have over-promised will be exposed," he said.
He added that John Lewis's framework was not a response to the green movement, but was "part of the way we have behaved for many years".