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Estimating is a critical aspect of every construction project. The most tedious component of an estimate is the quantity takeoff. Different tools are available to improve an estimator's productivity for a quantity takeoff. Faster quantity takeoffs enable estimator to bid more jobs. This study analyzed the time and accuracy of performing quantity takeoffs when using building information modeling (BIM) through a comparison study using Revit (BIM software) and On-Center's OST. In preparation for the study the researcher conducted a pilot study. Participants of the study were asked to perform a quantity takeoff using both Revit and OST. Their resulting data was then, analyzed comparing both the time and accuracy of each item taken off. The subjects' perspectives on the two different methods of performing takeoff are also included in the findings of this study. This study focused on a conceptual estimate takeoff for a small commercial building. The results of the study showed that, on average, those using BIM were able to perform the overall takeoff faster than those using OST while still maintaining equivalent accuracy. This study includes methods to improve productivity for quantity takeoff through an analysis of the takeoffs of counts, areas, and lengths. Findings of this study include methods, techniques, and cautions for performing a quantity takeoff using BIM.

Building Information Modeling has provided many benefits to the architectural, engineering, construction and facilities management communities. Many studies have been done to validate the asserted benefits, including benefits to the field of estimating. The studies on estimating are currently limited to the realm of conceptual estimates, and have only treated detailed estimates in the abstract. The purpose of this study was to determine how BIM was being used by companies in a hard bid, or detailed estimate scenario. The research team used the Deseret Towers housing project at Brigham Young University as the basis for the research. A building information model (BIM) was provided to all bidders on the project, and at the conclusion of the bidding process a survey was used to determine how the contractors used the model in their bidding processes. The findings determined that a few of the contractors did use the model for quantity takeoff, and one actually used the quantities as the basis for the submitted bid. Additionally, the survey attempted to determine the prevailing attitudes of the estimators toward BIM as a tool in estimating, and their opinions of the future of BIM in estimating.

There has been an increase in adoption of building information modeling (BIM) by commercial contractors over the past few years but there is not a clear indication of current application or the frequency of each use. This research was undertaken to determine the frequency and best practices of using BIM in commercial construction. Leading commercial contracting firms were contacted and employees were selected to complete a telephone survey that was designed to determine how they are using BIM. It was found that BIM is being used with more frequency on projects, with plans to continue to implement it even further on all projects that allow for its use. Most companies are incorporating trade contractors in their coordination meetings but are taking the lead to ensure a high standard is maintained. Trade contractors are given responsibility to resolve smaller clashes while bringing the larger problems to the clash detection meetings. The model quality being received is increasing as well the frequency of models being received from the design team; however, there is a lack of consensus as to the level of development requirement to ensure the model can be used for facilities management. Commercial contractors are adopting building information modeling for a variety of reasons. These include client requirements, innovative technology strategies, and fear of being left behind. Overall its use improves processes within their companies. The general agreement is that BIM is having a positive impact on profitability, schedules and sales. BIM further improves the efficiency, effectiveness and competitiveness. The best practices undertaken by commercial contractors include using BIM as a sales and marketing tool, utilizing subcontractors knowledge and allowing them to resolve minor clashes, having combination of BIM teams and BIM experts and investing in training employees and further development of BIM uses.

This thesis researched the accuracy of measured energy data in comparison to estimated hand calculation data and estimated building energy performance simulation data. In the facility management industry, there is minimal evidence that building energy performance software is being used as a benchmark against measured energy usage within a building. Research was conducted to find examples of measured energy data compared to simulated data. The study examined the accuracy of a simulation software and hand calculations to measured energy data. Data suggests that comparisons may be made between building energy performance simulated data and measured data, though comparisons are solely based on each individual case. Data suggests that heating load simulation data is more accurate for benchmarks than cooling load simulation data. Importing models into Autodesk Green Building Studio (GBS) was not as successful as was expected. When only four of the initial ten building models chosen imported successfully, the remaining twenty-five other building models were imported. Only two of the twenty-five models successfully imported into GBS. The sample size of this research changed from ten to six. The results of this study show that GBS simulated data was close to actual data for the heating loads. For the cooling loads, however, GBS simulated data was consistently low in comparison to the actual data. The results of this study show that hand calculations were consistently low and not as close as GBS simulated data when compared to the actual data for the heating loads. The opposite was true with the cooling loads as hand calculations were consistently high in comparison to actual data.

Building Information Modeling (BIM) use in the contracting industry has grown significantly in recent years. With this change in the construction industry, consensus has not been reached as to what BIM is, who is using it and what they are using it for. The purpose of this research was to determine current BIM practices of US-based commercial MEP contractors. Executive, middle management, and field personnel were interviewed to determine the current BIM practices in their companies. The majority of companies interviewed were using BIM and most were using it on a significant portion of their projects. The majority of MEP contractors using BIM were seeing positive results in many of six key performance indicators, profitability, schedule duration, field efficiency, change orders, rework, and safety. The top uses of BIM for MEP contractors were clash detection coordination, prefabrication, design creation, and quantity take-off/cost estimating. Most MEP contractors have not yet incorporated BIM for scheduling, sequencing, or safety analysis. Additionally most MEP contractors did not have a formal BIM training program in their company.

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Industri 4.0 bygger på en grundprocess som går ut på att  digitalisera information, koppla ihop information och enheter och därpå   automatisera processer. Inom fastighetsbranschen har denna process lett till uppkomst av ett nytt teknologiskt spår - BIM - Byggnadsinformationsmanagement (Building Information Management). Denna rapport undersöker och ger en djupare förklaring av BIM som verktyg, metod och tankesätt både teoretiskt genom en bakgrundsbeskrivning och praktiskt genom ett konkret exempel.Det konkreta exemplet undersöker hur man med hjälp av moderna branddetektorer med inbyggda temperaturmätare kan beskriva temperaturen i ett rum i realtid. Resultatet visar samband mellan temperatur uppmätt med en branddetektor i takhöjd och temperatur på arbetshöjd satt till 140cm från golvet. Resultatet sätts sedan i ett bredare användingsperspektiv som förslag på vidare undersökningsarbete. / Industry 4.0 is based on a basic process of digitizing information, linking information and devices, and automating processes. In the real estate industry, this process has led to the emergence of a new technology track - BIM - Building Information Management. This report investigates and gives a deeper explanation of BIM as a tool, method and mindset, both theoretically, by a background description and practical by a concrete example. The concrete example investigates how the temperature of a room can be described using modern fire detectors with built-in temperature gauge in real time. The result shows the correlation between temperature measured with a fire detector at ceiling height and temperature at work height set to 140cm from the floor. The result is then put in a broader perspective as a proposal for further investigation.

The AEC (Architecture, Engineering, and Construction) industry has been undergoing a significant digitaliza-tion process in the last years. This transformation implies new challenges and adaptation concerning the ex-change of data between different software applications. Therefore, in response to this problem the benefits of IFC as a solution for the exchange of data have been investigated. However, the current versions of IFC cannot achieve semantic clarity in mapping entities and relationships. Therefore, there have been several attempts to develop solutions and optimizing methods to improve the exchange of information of product data. This paper aims to identify and investigate the challenges of using product data templates (PDT) for exchange of infor-mation and different PDT has been evaluated and compared. The necessary data was collected through literature review and document analysis. Five challenges and five initiatives were identified during the literature review. The five initiatives are Semantic web and linked data, CoClass, Buildingsmart, COBie and Cobuilder. The result showed how these initiatives could solve the identified challenges.

A Green building is a well-managed building both in its technical and managerial senses. To achieve a Green Building standard, real estate developers should have frameworks in place to monitor and provide information regarding the sustainable aspects of the building. ESG data of a building is related to the Energy, Social, and Governance impact made by a building during its operations, and building a standardized and scalable solution to monitor this data will allow the developers to achieve a Green Building status easily. A Building Information Model is an architectural model that can be used to manage data from within a building to help provide its stakeholders with relevant data. This thesis aimed to design a BIM to manage the ESG data of a commercial building allowing the real estate developers to monitor and manage the building more sustainably with improved transparency and with the ability to make faster data-driven decisions. Action Design Research was the research strategy used to carry out the research and semi-structured interviews along with literature reviews were conducted to collect data. Thematic Analysis was done to identify themes in the collected data and the analyzed data was used to create the artifact. The artifact was then tested in the industry by gaining feedback from the industry. The thesis successfully designed an architecture model by collaborating with the industry and suggesting a universally applicable model to manage ESG data more efficiently. The model also gives importance to external software vendors and data consumers to help make the system more scalable and adaptable.