Nowadays, the training references that are part of the national catalogues of qualifications do not integrate Units of Short-term Training (UST) concerning sustainability issues. Although the construction industry has adopted several new technical improvements enabling companies to build more sustainable buildings, the training offer is still limited and the European cooperation is relatively weak. The main goal of the project is to develop training resources and modules to improve the skills on sustainability issues of workers of buildings maintenance and refurbishment. The use of the methodological principles of the European Credit System for Vocational Education and Training (ECVET) in the development of the UST will allow its subsequent integration in this system and will facilitate the transparency of qualifications and their recognition in all European countries. Five UST will be developed and integrated in the vocational training of carpenters, painters, bricklayers, building technicians, and installers of solar panels. Also a transversal unit will be developed, concerning basic concepts on sustainable construction and “nearly zero energy buildings”. A second goal is to improve the information provided for clients, through the development of a guide to support the procurement decisions related to building products and materials. All the other training resources produced will be available in electronic format in three languages: Portuguese, Spanish and French.The FORMAR project will contribute to the development of national and sectorial qualifications by: - Making the connection between the area of sustainability, the construction sector and pedagogical concerns related to the need of appropriate qualified professionals;- Providing an opportunity for the development of the training itineraries more consistent, allowing the adaptation of existing skills to the present job market, increasing the employability and the labour mobility.