Timber construction has gained prominence due to its qualities such as sustainability, thermal performance, mechanical resistance, versatility, and aesthetics. These advantages have driven the development of numerous innovative wood-based construction systems. However, many systems enter the market without undergoing crucial experimental assessments, such as watertightness, air permeability, mechanical resistance, or acoustic performance. This lack of evaluation can lead to poorly adapted solutions for the buildings and building pathologies with potentially catastrophic consequences. European Technical Assessments (ETAs) provide a robust solution to mitigate these risks. Besides enabling CE marking, which facilitates the free circulation of construction products within the European market, ETAs allow experimental and numerical characterization of construction systems. For timber building kits, such evaluations can be conducted under EAD 340308-00-0404. Through case studies of two innovative solutions from Rusticasa-Construções, Lda.—a thermal log kit and a timber frame—this research not only elucidates how the CE marking process, based on the ETA voluntary route, facilitates market entrance, but also reinforces the reliability of wood as a construction material through standardized performance validation. The results obtained allow for a detailed characterization of the construction systems in key domains such as watertightness and air permeability, confirming that the evaluated solutions exhibit levels suitable for most applications; thermal insulation with high thermal resistance values; vapor permeability, where no risk of condensation was confirmed; and mechanical resistance, where the results obtained can be integrated into structural design. In addition to presenting the results of tests, this paper highlights the importance of collaboration between industry stakeholders and Technical Assessment Bodies to streamline the CE marking process and foster the adoption of wood-based systems. The experimental characterization conducted during the ETA issuance process benefits manufacturers, designers, installers, project owners, and other stakeholders in the construction sector. Thus, this work highlights the critical role of experimental assessment in safety, and market readiness of innovative timber construction systems.