The need for maintenance arises because buildings inevitably deteriorate with time due to various causes. Building maintenance has consistently been treated as the poor relation of the construction industry, attracting only a tacit recognition of its importance. To reduce this problem, Niger State Library Complex in Minna was studied with the aim of evaluating its effectiveness and efficiency, in order to generate guidelines to improve the design and services of Nigerian libraries. In achieving this, the research data collection was both quantitative and qualitative using descriptive survey method. Questionnaire, interview and direct observation were used for the data collection and table was used in presenting them. The results showed that many users are not fully satisfied with the library; the design and services of the library are not satisfactory, and it is dilapidating; there is a need for many staff of the library to undergo training that will improve the services for the users. Among other recommendations are: the government should adequately maintain the libraries in Nigeria, and the access roads to the Nigerian libraries should be tarred or covered with any other hard surface to avoid the growing of grasses on them.