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Purpose: Reuse of building materials is identified as a key strategy to reduce theenvironmental impact of the construction sector, as it reduces the need for producing newmaterials and the amount of waste generated. The purpose of this study is to examine theconditions for increasing the reuse of building materials in today’s construction industry. Thework identifies and analyzes the challenges and obstacles companies face whenimplementing review building materials. Additionally, this study aims to demonstrate theeconomic and environmental benefits of reusing. Method: used to conduct this study wastwo case studies. One was with K/fast, which is building a new care facility using reusedbricks. Meanwhile the other one was with NCC, which carried out its Yrket 4, where theyused reused concrete. Furthermore, interviews were conducted with key personnel from bothprojects. Results: Companies in the construction sector face several obstacles inimplementing reuse strategies. The lack of clear guidelines for quality assurance of reusedmaterials creates uncertainty. Logistical challenges and higher initial costs discouragestakeholders from using reused materials. The study shows that increased reuse of materials,waste and carbon emissions are reduced. The case study in Eskilstuna demonstrated aneconomic saving of 185 705 SEK and a carbon reduction of 7,662.4 kg CO2e, equivalent to a98.6% decrease. Conclusions: In terms of economic aspects, reused materials are oftenperceived as more expensive and less reliable compared to newly manufactured alternatives.Despite this, long/term cost savings can be achieved through reduced waste managementexpenses and lower material purchasing costs. Two case studies were carried out: inSkogstorp, Eskilstuna reused facade bricks were used, resulting in significant savings.Meanwhile, at the headquarters in Solna, reused HDF slabs led to a saving of 21.92 millionSEK and a carbon reduction of 420,720 kg CO2e, corresponding to a 79.6% decrease.