The article presents selected results of surveys of Polish construction companies, relating to international competitiveness of the Polish construction sector. The research was carried out in 2002 and covered 40 construction enterprises registered in Poland. The author presents, analyses and interprets this section of survey’s results which is focused on the structure of competition within the Polish construction sector, the relationships between Polish construction companies, and the rivalry, co-operation and avoidance strategies pursued by the mentioned enterprises. The results are presented in a breakdown into three market categories: the domestic market, the German market and other markets, as well as into companies representing different degrees of internationalisation.