At IGLC 2014 a Lean Construction Maturity Model (LCMM) was introduced and at IGLC 2015 its validation was presented. The LCMM offers organizations in the AEC Industry to obtain a systemic and holistic overview of their current state of LC maturity and provides them with support in their maturation. This paper intends to motivate its implementation in practice in order to test and demonstrate the whole range of benefits and implications of the LCMM. Therefore, this paper proposes a self-assessment template of the LCMM with a two-step procedure to obtain the current maturity level of any organization with regards to Lean Construction (LC). It will enable practitioners to measure the gap between where they currently are as well as develop an improvement plan to improve their LC maturity.