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Tools for evaluating the economic efficiency of modernisation measures

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Here you can find brief information about selected calculation tools currently available online through different providers. (For the contents the providers are responsible.) Different detailed specifications about the planned modernisation measures are necessary for using the tools in order to receive sufficient results. Despite this, the processing time is generally low; about 15-30 minutes can be estimated just for entering data.

Renovation configurator (“Sanierungskonfigurator”) of the Federal Ministry for Economic Affairs and Energy (BMWi)

The renovation configurator is well suited for initial considerations in connection with an energy modernisation. Knowledge about the current state of the building components and technical building systems is necessary.

The renovation configurator permits a calculation of average investment costs and energy savings using detailed input about the building quality (current state) and the chosen measures (resp. measure packages). The target performance level of the individual renovation measures can be adjusted individually (EnEV / KfW-funding levels / individual).

The result provides input data for an estimated efficiency calculation:

• the investment costs (€)
• the energy savings of the measure(s) (kWh/a)

(external) Link: „Sanierungskonfigurator” (available in German language only)

Expert Tool Cost Effectiveness (“Expertentool Wirtschaftlichkeit”) of the German Energy Agency (“Deutsche Energie Agentur” DENA)

The “Expert Tool Cost Effectiveness” is designed for the target groups of energy consultants and ambitious building owners. Planned measures, attainable energy savings, as well as the state of the building must already be known. Subsidies and KfW loans can be taken into account.

The energy certificate should – however on a voluntary basis - indicate as part of the modernisation recommendations the estimated amortisation period, the costs for the saved kilowatt hour (equivalent energy price) or both. For this purpose, the German Energy Agency (DENA) offers the DENA “Expert Tool Cost Effectiveness”.

The tool allows a calculation of investment costs and the cost effectiveness of the measures (resp. measure packages). Necessary input data are building properties, intended measures and calculated energy savings. As a result, the values “amortisation period” and “cost per saved kilowatt hour of end energy,” which are foreseen as information in the energy certificate. In case of an application for subsidies, these can also be taken into account within the economic calculation. The conditions can be set individually.

(external) Link: „DENA Expert Tool” (available in German language only)

CO2 online modernisation check

(funded by the German Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety)

The tool is suitable for an initial estimation of the efficiency of energy modernisation measures in buildings. The data entry effort is low, subsidies are taken into account, and results can be loaded or saved after registering.

In several steps, the tool permits a first overview of potential energy savings, renovation costs, and the efficiency of chosen measures. It is directed toward homeowners, tenants, and landlords. The conditions for efficiency calculation can be set individually. The modernization check is useful for estimating possible saving potentials and investment costs as well as the efficiency of modernization measures even before an energy consultation. Many pre-set parameters may be individually adjusted. The result provides the user with the following data, among others:

  • the investment costs (€) with a split between maintenance and modernisation costs
  • the energy savings of the measure(s) (kWh/a)
  • a possible claiming of loans and KfW subsidies (€)
  • the annual debit from using the (subsidy) loan (€/a)
  • the annual cost savings (€/a) and
  • the surplus or deficit generated (€/a).

(external) Link: “CO2-Online Modernisierungscheck“ (available in German language only)

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