EN JÄMFÖRELSESTUDIE MELLAN MANUELL UPPMÄTNING OCH LASERSKANNING VID OMBYGGNATION

Sammanfattning: Purpose: In a survey from the Swedish National Board of Housing, Building and Planning, important causes for deficiencies, faults and damage in renovation projects has been identified. Lack of time proved to be the most cause, which also entails large costs of action to remedy the faults/damages. Digital tools provide opportunities for streamlining time and costs. Laser scanning is one such tool. However, the knowledge of laser scanning is not extensive in the construction industry and/or is assumed to cost a lot. The aim of the work was to compare laser scanning against traditional building surveying method to know which method is more advantageous regarding profitability. Method: To achieve the objectives of the work, a survey strategy was used that was both qualitative and quantitative. Literature study and interviews gathered knowledge about the advantages/disadvantages of the two building surveying methods (laser scanning and traditional) and factors that affect the profitability when using them. Calculations were performed to compare the costs of the methods regarding the complexity of the project. Findings: The generated result shows that laser scanning has more advantages than traditional building surveying. Laser scanning takes less time to perform in bigger projects and results in greater accuracy in the as-built documents than traditional building surveying, among other things. From a cost-benefit perspective it is important that for each specific project calculations should be made separately for the two building surveying methods to see which one is less expensive. The project used in this thesis would have been more profitable with laser scanning as a surveying method, while for other projects it might be more profitable with traditional building surveying. Implications: The study indicates that laser scanning is more profitable in terms of time and cost savings. Laser scanning should be chosen as a surveying method if you want to save time and get better accuracy, which results in less errors in the project planning. For larger projects, laser scanning is also recommended from a cost perspective. The survey also gives clients and contractors a better view of the benefits from using laser scanning. Limitations: The study was limited to treating only terrestrial laser scanning when surveying existing buildings prior to renovations, hence the result cannot be generalized to other types of laser scanning. Keywords: Laser scanning, Traditional building surveying, BIM, Profitability, Renovation, Complexity, LOD.