Purpose: Building Information Modelling (BIM) has been implemented by large design and construction practices. However, it is not widely (if at all) used by SMEs (Small, Medium Enterprises). Furthermore, adoption and implementation of BIM to enable lean design process brings about changes and new challenges and investments for stakeholders. The aim of this paper is identify a roadmap for BIM adoption and implementation with lean design principles using the live experience of BIM adoption via a Knowledge Transfer Partnership (KTP) project for an architectural company. Design/Methodology/Approach: The research was undertaken through a KTP (Knowledge transfer Partnership) project between the University of Salford and the John McCall Architects practising in housing and regeneration. The overall aim of the KTP was to develop lean design practice through BIM adoption, which used a socio-technical view that does not only consider the implementation of technology but also considers the socio-cultural environment to provide the context for its implementation. Thus, the action research oriented qualitative and quantitative research is used for discovery, comparison, and experimentation as it provides “learning by doing”. Findings: The BIM implementation process in the paper provides guidance for BIM adoption for SMEs. The key performance indicators and efficiency gains identified earlier in the project has been achieved through the piloting projects. The capacity building through the improvements in process, technological infrastructure and up skilling JMA staff has enabled the realisation to attain competitive advantages for the company. Originality/Value: The paper presents a BIM implementation process for SMEs adopted in the case study project. It will also contribute to development of a BIM implementation adoption framework.