This study shows how financially profitable it is to increase the quality of accommodation in existing apartments located in Crikvenica and have behind them already 4 very successful seasons. Analyzes and calculations gave results that are outlined in the conclusion. The subject of the research was whether it was financially viable to invest in apartments already working with profits and after how much time would return the money invested. The problem of exploration was the possibility of a false cost estimate and a false estimate of the return on investment, and the problem is that the project lasts longer than anticipated, which ultimately means less time for work and revenue. For this graduate thesis it was used primarily the statistical method that enabled to make the conclusions about the number of research samples first, and then, by drawing up the graph and the tables, it came to general conclusions on profitability. The content of the work is divided into eight chapters. In the first chapters it was presented in detail the goals of work, methods of work and research questions, then was studied the role of tourism in the Croatian economy and the demand and strategy of tourism in Crikvenica. In the last chapters, was used scientific methods of analysis and the results of these researches. Since private renters can easily adapt to the needs of the market, they will in the future have an important role to play in the development of the tourist offer. In this paper, a project of investment in additional apartment accommodation is resulted as profitable but also important for the improvement of the tourist service of the Crikvenica Riviera.