Effective business negotiation is key to achieving business success. Effective negotiation covers a wider range of business contexts, including business deals, employment discussions, corporate team building, work / management negotiations, contracts, dispute resolution, employee benefits, company acquisitions, supplier prices and sales, real estate leases, and contract performance. obligation. In business communication, business negotiations, business meetings, as well as in human communication in general, it is important not only the data conveyed by the content of the words, but also how those words were pronounced, what nuances of voice were used. The ability to understand the speech of another person's body, the opposing body - to imagine what he is thinking, what he feels, how much he reacts, what he promises to do - business negotiations and business conversations are very important in business communication. To develop this ability requires a lot of effort: to absorb the theoretical framework and apply them in practice. Body language is very informative and sends many signals to the interlocutor, the opponent, but obviously this is difficult to interpret, and sometimes it is not possible or desirable. The accuracy and quality of interpretation depend on knowledge and interpretive practice. Based on the conducted research, it can be concluded that 94.4% of respondents believe that non-verbal communication is important for the success of negotiations in the construction sector and that non-verbal communication is more important than verbal communication during negotiations in the construction sector.