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 compares the main principles of the Building Legislation in the nine co-operating countries in the Northern Dimension region. It is mainly based on two earlier reports where the information has been up-dated. The report also comprises a case study on Control Systems in the nine countries.