This report deals with the forest potential of Portugal and its timber industry and outlines the evolution of wood preservation in the country. The main hazards to timber in service are noted and the timbers used classified according to their natural durability and treatability. The wood preservatives used are detailed with estimates of the total consumption of the different types. Addresses are listed, of the known manufacturers and importing agencies, of the firms that treat by vacuum/pressure and those that employ the double-vacuum process, and of the organizations concerned with wood preservation research and wood preservation in general. Only two firms specialize in remedial treatments and there are two institutions which are responsible for restoring cultural properties. Information is given on requirements and approvals. The relevant standards are listed and the main Portuguese papers on wood preservation.