A comprehensive building survey as well as the analysis of the condition of the existing structure of the building to be retrofitted is an essential precondition for a successful planning, construction and life phase of a retrofit project. The planners of the process need full control over all requirements for energy efficiency. Additional a comprehensive knowledge on the construction and material is needed, as it is present in the existing building. Starting with the explanation of the condition of survey and planning as the intrinsic property of prefabricated solutions the text describes the requirements for knowledge based retrofit processes from survey, construction planning to production and assembly. A complete condition analysis of the existing building structure as well as building materials is a key factor in building modernisation and of great importance to create as much knowledge as possible in the early stage of the project. A checklist exemplifies different tasks and points out the responsibility of planners and engineers. A fully featured 3D model for planning and production is needed otherwise industrialised retrofitting based on prefabrication is highly risky. The first crucial step in industrialised retrofit for energy efficiency is to translate built reality into the planning tools. The 3D model develops in different steps. It starts with the application of specific surveying methods to develop a 3D image from the existing object. Based on this data surveyors or trained architects or engineers have to develop the building information model. It is a transformation of real 3D data into usable planning data. The abstract gives an overview of current surveying methods and describes different approaches in building measurement based on Tacheometry, 3D Laser Scan and Photogrammetry. Based on the demonstration project Grüntenstraße, Augsburg Germany the experience of the surveying and planning process is explained and gives an overview of features and guidelines of a comprehensive digital survey.     «

A comprehensive building survey as well as the analysis of the condition of the existing structure of the building to be retrofitted is an essential precondition for a successful planning, construction and life phase of a retrofit project. The planners of the process need full control over all requirements for energy efficiency. Additional a comprehensive knowledge on the construction and material is needed, as it is present in the existing building. Starting with the explanation of the con...     »