In November 2004 the Nordic Council of Ministers together with the Nordic countries, Estonia, Latvia, Lithuania and Poland decided to initiate a colaboration by approving an action plan for improved co-operation between the countries concerned in the area of construction and building. The co-operation will take place through the following activities: to make market information and information on national regulations accessible to potential actors on the market to expand the basis of experience and newfound knowledge in housing construction to undertake a comparative analysis of regulations within the building sector intended to serve as a basis for deliberations on possible harmonization to make it possible to compare competency requirements imposed on certain actors in the building process to establish a network for joint research and development on issues relevant to the plan of action This report describes the main principles of the building legislation of the three Baltic countries and Poland, and compares some of the central issues. The report has three main sections: Background and "frames" for building activity in each country Comparison of the principals for the building legislation Implementation