The certification procedure of building thermographers was started in 2003, even though thermography has been used in Finland in building survey since late 70´s. There has been about a 25 years´ unorganized and more or less wild period, without any generally accepted rules for interpretation, as well as how to order thermography services, how to report the results, how to do the practical work in the buildings etc. The service was provided by consultants with varied backgrounds. More operators have come into the market and building developers and contractors have begun to use thermography for quality control in new building and in renovation planning.In the year 2004 various organizations in building trade launched a pilot project to certificate building thermographers. The structure and the topics of the course were introduced in Thermosense 2005. By the end of the year 2005 the third course was completed. From the beginning of the procedure to the end of the third course about 40 persons have received a certificate.During the certification process, two guidelines have been published, as part of RT (Building Information) -files: instructions for ordering, for practical field work and for reporting of thermography survey in buildings. The guidelines also contain basics for interpretation. The interpretation is consistent with the other existing directions (building codes etc). At the turn of 2005 -2006 a new book of building thermography was published. There is still lack of comprehensive as well as unambiguous rules for interpretation.In the paper we will present experiences on the courses, the main problems posed to the participants and findings during the last two -three years´ field work. We will also introduce briefly the structure and content of the guidelines and an example how to use thermography as a tool of quality control in new building. The case studies are new one-family houses in a housing fair and exhibition area in the city of Oulu.

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