As the construction sector in 2019 accounted for 21% of Sweden's greenhouse gasses and 40% of Sweden's waste, recycling is something that will be required if Sweden are to become climate neutral by 2050, which has been decided upon. By reusing building materials, it contributes to a reduction of greenhouse gasses in the manufacturing, transport and recycling of building materials. Reusing means that the material does not change into anything else hence time, money and work are therefore saved compared to recycling. The project has been carried out to report the possibilities of reusing materials between Vasakronan and Atrium Ljungberg. This report delves into bricks, metal sheet roofs and suspended ceiling tiles and reports the potential for reusing them. Ceiling tiles, metal sheet roofs and bricks have all shown potential to be reused not only to reduce carbon dioxide emissions, but they have also proven to be economically viable to reuse. Metal Sheet roofs proved to be good to recycle from a carbon dioxide perspective and reusing proved economically viable even if by less of a margin than for ceiling tiles and bricks. The report is based on a literature study about reusing, as well as interviews with five participants in different companies. The report contains calculations for the profitability of reusing selected materials as well as carbon dioxide emissions in the production and transport phases. The market for reusing materials is underdeveloped in large parts of the country, but the market has begun to develop in recent years partly with initiatives from companies in the construction industry but also that Sweden's municipalities have begun to investigate the issue to help establish local markets for reusing materials. Even though not much is reused today, there is hope that material reuse will be one of the pillars in the construction industry in the future. Therefore, this rapport was done to show how such a collaboration could be operated.