In order to identify and bring answers to the problematic of sustainable development posed to the industrials, we develop a methodology aiming at designing sustainable products, which we define as clean and recoverable. In order to help designers to integrate the environmental criteria in the decision making process which will lead to the choice of a design alternative, they need to have access to robust indicators based on environmental assessment of the product and its associated end-of-life scenario. In this article we propose in a first part to model the product as an assembly of components lifecycles in order to build pertinent indicators for designers. Then we develop the concept of "lifecycle bricks" which permits to easily build the products life over many usage cycles, and thus allow on one hand to measure the benefits or loss of one strategy, and on the other hand to gradually focus until the environmental hot spots of the products have been revealed.