A new model of sustainable development is based on reducing energy demand and on improving performance and process. The energy efficiency can be achieved through proper natural lighting design strategies, like optimal building form, skin, and orientation for daylight. By using daylight to illuminate the interior of a building, the need for electrical lighting can be reduced and internal heat gains can be minimised. Moreover, buildings that are properly designed to take advantage of natural light provide healthy indoor environments, that are linked to gains in productivity, decreased absenteeism, improved employee morale and increased occupant satisfaction. Daylit office buildings can improve the overall well-being of their occupants.Nowadays the architect begins to have the biggest influence on decisions which shape the indoor environment and conditions perceived by building occupants, and building's energy efficiency. The process of creating sustainable office buildings starts at the beginning of a building life cycle, at stages of planning, architectural programming and conceptual design. The early stages of architectural design involve the design decisions that are crucial for achieving high performance of the designed buildings. Moreover, the right decisions about the massing of energy-efficient buildings are unachievable without advanced computer simulations. However, daylight and other energy tools are under-utilised in the majority of architectural offices.This paper investigates the potential of integration of natural lighting design strategies into the early stages of architectural design process, to improve the energy efficiency of office buildings in Poland and the well-being of their users. A review on new and innovative technologies for utilising daylight in office buildings is presented. This article also demonstrates results of the analysis of various ways to redirect sunlight or skylight to areas where it is required. This analysis has been made with the assistance of Autodesk Ecotect performance analysis tool. Models of selected architectural solutions, for example massing, have been simulated for a parametric analysis, influence of these decisions on the building’s performance has been calculated and visualised. A brief survey on how natural lighting systems have been integrated in the latest office buildings is provided. This article also describes possible methodologies for approaching the design of sustainable high performance office buildings in the moderate zones, providing continental climate with temperatures in winter to -15°C and in summer to 32°C.