Ethics have a verifiable effect on the validity and economic supportability of quantity studying practices and additionally influencing the individual security of the profession. There is a developing consent inside and outside the construction industry that unscrupulous practices are endemic in the construction industry especially quantity surveying practice in Nigeria. This paper thusly, x-rayed the outcomes of unethical practices by Quantity Surveyors in the construction industry in Nigeria, and likewise displays more scholarly and practical approach in dealing with moral appraisal of Quantity Surveyors in the construction industry and ways to improve moral standard among them. Very much organized polls (questionnaire) were self-administered to stakeholders and professionals in construction organizations. Literature review also revealed that unethical practices result to dissatisfied clients, late compensation due to delays, low productivity/efficiency of project team, deterioration in professionalism, poor workmanship, high maintenance, upward review of contract cost, poor project coordination, poor quality infrastructure development, stunted growth of the industry, reduction in the life span of building, loss of public trust, conflicts between client and construction team, poor quality of infrastructural development and loss of public trust. Data were collected and analyzed using Mean Item Score (MIS) and Standard Deviation (SD). The results shows that dissatisfaction of clients, High maintenance cost and Poor workmanship were perceived to be the major ethical misconduct by Quantity Surveyors in the construction industry. The study recommended that Quantity Surveyors should not always make financial benefits, other advantages as their real concern and gain cash unethically by all means. Others professionals in the industry ought to dependably be caution and endeavor not to keep any untrustworthy conduct among themselves. Major client in Nigeria construction industry, which is the government need to be fair to the Quantity Surveyors and other professionals in the construction industry.