The article presents the outcome of the research on the facades and woodwork of historic buildings in northeast Poland, carried out by the author in the years 2007-2018. The need to take such action was justified by intense renovation and construction activity, which contributes to the disposition of historic finishing coats of plaster as well as dilapidated historic windows and doors, at the same time leading to the loss of the original character and the historic value of buildings. The research conducted not only documents the original paint color and plasterwork, but allows for the observation of the dominant trends in architecture coloring at the turn of 19th and 20th centuries in Olsztyn and small towns of warmia-masuria province. The outcome of the research may help with the restoration and reproduction of the facade polychromy of historic buildings erected at that time.