Construction productivity is one of the most frequently researched topics due to its importance to the viability of the industry. Buildability is defined as the extent to which the design of a building facilitates ease of construction, subject to the overall requirements for the completed building. In this project, the major buildability factors hypothesised to influence the labour productivity of the main trades, i.e. formwork, reinforcing steel fixing and concreting, included grid patterns of footings and columns, type of structural framing system, geometry and dimensions of elements, height of floors, the degree of design rationalisation, standardisation and repetition of elements, reinforcing steel quantity and diameters, location and congestion of reinforcement, volume and workability of concrete as well as surface finish. In addition, and due to its importance to the productivity of the construction industry, the effect of the learning curve theory has been also examined in this study. This research project has quantified the relationship between the principal design characteristics of in situ reinforced concrete construction and labour productivity of the various trades involved. It can provide practical guidance to architects and structural designers who seek to optimise their designs. In addition, it can give a feedback on how well the designed building considers the requirements of the basic buildability principles and provides for tangible consequences of their design decisions on the construction labour productivity.