At present, more than half of all building activity in the German building sector is undertaken within existing built contexts.The development of a conceptual and technological basis for the digital support of design directly on site, within an existing building context is the focus of the research project "Spatial Augmented Reality for Architecture" (SAR).This paper describes the goals achieved in one aspect of the project: the sampling of colors and materials at a scale of 1:1 using Augmented Reality (AR) technologies.We present initial results from the project; the development of an ad-hoc visualization of interactive data on arbitrary surfaces in real-world indoor environments using a mobile hardware setup.With this, it was possible to project the color and material qualities of a design directly onto almost all surfaces within a geometrically corrected, existing building. Initially, a software prototype "Spatial Augmented Reality for Architecture-Colored Architecture" (SAR-CA) was developed and then assessed based on evaluation results from a user study.

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Activities in the building industry in Germany concentrate increasingly on a combination of renovation and new-build. A look at current computer aided applications reveals a serious lack of IT support for the whole architectural design process in and within existing buildings (e.g. building surveying, designing on site and the preparation of information for further use in later planning stages). An ongoing interdisciplinary research project undertaken jointly by the faculty of media and the faculty of architecture is investigating methods and techniques for the computer-aided support of the design process in and within existing buildings. The goal is to develop a hardware and software concept for a "designtoolbox" based on SAR (spatial augmented reality) and to implement aspects of this as prototypes. This paper describes the goals of the "Spatial Augmented Reality for Architecture" project and discusses possible fields of application for SAR for supporting the design process in existing buildings from a user's perspective. This paper presents the initial results of the project, the development of a cave-like hardware and software concept called "low-cost projection in room corners" and the description of the core concept based on a client-server architecture. The project is funded by the "German Research Foundation (DFG)".