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As a significant building sub-system, facade needs to be designed through the consideration of a wide range of factors. Facade design is given shape as a result of a collaborative work by stakeholders from different disciplines based on outdoor (environmental) and indoor (spatial) conditions, as well as project specific constraints, time/budget limitations, legislation in order to fulfil functional, environmental and financial requirements of the project/users. Even just functionality related performance attributed to a facade is multifaceted such as structural, daylighting, or acoustic. Although, in literature there are researches focusing on different aspects of facade performance, there is a lack of a holistic point of view that considers different aspects at once. Aim of the paper is to present (a part of) a tool developed to be used during the facade design process and counts functional performance aspects altogether. The tool provides a holistic systematic approach in order to support the design optimization. It is intended to assist decision-makers while giving decisions on facade parameters (design variables) to consider their interactions with functional performance aspects in possible environmental and spatial conditions. The tool is in the form of spreadsheet designed via Microsoft Office software. The functional performance aspects included in the tool are structural, fire, water related, air permeability related, thermal, moisture related, daylighting, and acoustic performances. The facade parameters defined as the main decision subjects within the tool are orientation, transparency ratio, facade type, window type, glazing, framing, shading, wall configuration …