The first part of this document presents, in chapter 2, a description of timber characteristics and common used NDT and MDT for timber elements. Stochastic models for timber properties and damage accumulation models are also referred. According to timber’s properties a framework is proposed for a safety reassessment procedure. For that purpose a theoretical background for structural reliability assessment including probabilistic concepts for structural systems and stochastic models are given in chapter 3. System models, both series and parallel systems, are presented as well as methods for reliability calculation. In chapter 4, updating methods are conceptualized and defined. Special attention is drawn upon Bayesian methods and its implementation. Also a topic for updating based in inspection of deterioration is provided. State of the art definitions and proposed measurement indices for robustness are dealt in chapter 5. The second part of this document begins in chapter 6, where a practical application of the premise definitions and methodologies is given through the implementation of upgraded models with NDT and MDT data. Structural life-cycle is, therefore, assessed and reliability and robustness indices are proposed. The final part of this document presents the conclusions that were found, in terms of results and outcomes, and future perspectives and recommendations for further development and improvements.