The aim of the thesis is to establish the value of company Okna Rabien for its current shareholders. Okna Rabien is a manufacturing company active in the field of plastic windows and doors production. The thesis is divided into two parts. The first part summarises the key valuation theory concepts. The second applies chosen valuation techniques on the case of Okna Rabien. It contains strategic and financial analysis, value drivers part, financial plan and the final valuation. The value of the company was established by Discounted Cash Flow to the Firm method.