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Implementing BIM in existing buildings – with tools and services from the Keßler Group

15. November 2023


In order to integrate the BIM method as intelligent building data modelling into building operations in a practical way, it is essential to network the 3D building model with existing information, a CAFM system such as FAMOS, sensor technology and IoT. This is the only way to create a digital twin, which creates a direct, virtual image and can fulfil many of the promises made by BIM. In existing buildings, the digital twin enables sustainable, process-optimised facility management through, for example, preventive maintenance planning and control or optimised space utilisation.


Creating a virtual building data model during the operating phase or during renovation or modernisation is a particular challenge. In contrast to a new building, a lot of current data is not available, e.g. exactly which materials were used where and how, etc.


In recent years, the Keßler Group has gained extensive expertise in the development and application of the digital twin in existing buildings through concrete practical experience (more below).


Before creating a BIM model in the existing building, it is essential to seek advice in order to agree on a standardised measurement concept, an appropriate procedure and an appropriate scope of data collection and georeferencing. Established BIM as-built models should also be checked for up-to-dateness once a year by means of an inspection.

3D view of the smart city quarter Future Living® Berlin with transport link
3D view of the smart city quarter Future Living® Berlin

Take the first step from 2D to 3D with us!


Autodesk® Revit® supports BIM and object-orientated work. The programme enables digital 2D and 3D models of properties that depict all the information of the originals. Via the bidirectional BIMflow interface for Revit, the FAMOS CAFM system offers you the option of integrating the models for a multidimensional, process-orientated view into the effective management of your buildings and facilities.

Icon BIMflow for Revit

ADVANTAGES of the digital twin – USES of BIM in existing buildings

  •  Complete 3D visualisation of properties: from the surface area to the furniture to the installed technical building equipment
  •  Time-saving and convenient data maintenance as well as quick access to all data in one system for all trades
  • Utilisation of data in management processes, such as management of (rental) contracts, maintenance & repair management, energy & environmental management, tendering & service management
  •  Permanently increasing data quality through the standardisation of processes and the resulting process reliability
  • Virtual inspections, digital exposés and graphic conversion and relocation planning for refurbishment/modernisation, among other things
  • Securing competitive advantages in terms of future viability


Keßler Ingenieur Consult specialises in surveying and digitisation projects in all service phases (design, planning and construction) as well as in existing buildings. The BIM portfolio for surveying land, buildings or industrial plants includes measurement concepts according to AIA, data collection (own collection as well as integration of third-party data), digital terrain models (2D/3D), georeferencing, geodetic measurement methods with 3D laser scanning, terrestrial photogrammetry, optimisation for FM software and as-built documentation (e.g. determination of rental space, room books).

Datenerfassung mittels modernster Messverfahren bei der Keßler Ingenieur Consult
Data acquisition using state-of-the-art measurement methods at Keßler Ingenieur Consul
TGA-Datenerfassung der BCS via QR-Code-Scan
TGA data acquisition from BCS via QR code scan

The company sister BCS GmbH offers further data acquisition services. Here too, a structured consultation and selection of the data to be digitised or checked for the first time takes place at the beginning: Recording of entire properties, individual properties, structural and technical installations, condition assessments and recording of installed IoT sensors or inventories. All required object types can be database-specific (Access, SQL, CAFM system), based on current guidelines (e.g. DIN 277, MFG, WoFIF), provided with QR codes and prepared in a CAD and BIM-compliant manner. The recorded data can then be used as the basis for an energy audit or a fire protection concept, for tenders or emergency property manuals, for example.

Basis 2: Using BIM in the operating phase

In recent years, the team at Keßler Solutions has gained practical experience in recreating a digital twin during the operational phase of a property. By consolidating external data (e.g. construction plans, order documents), self-collected as-built data and the correction or reconstruction of missing information, such as the addition of heights or sections to 2D plans for the 3rd dimension, simple to very compact models are possible, as the examples of Future Living® Berlin and the Keßler Solutions office show.

Digitaler Zwilling Büroetage von Kessler Solutions
Digital twin office floor from Kessler Solutions
Digitaler Zwilling Büro mit Arbeitsplätzen bei Kessler Solutions
Digital twin office with workstations at Kessler Solutions
Digitaler Zwilling - CAFM-Software und CAD-Pläne werden verknüpft
Digital twin – CAFM software and CAD plans are linked

All data provides the basis for the various dimensions of the digital twin and thus for modern, sustainable and optimised management. The digitisation of building information not only supports current operations but can also be used for modernisation projects and conversions, regardless of whether it is used in a CAFM system.