How about starting with an energy audit?

Take stock of your energy consumption and use. Then, let’s deploy your energy optimization plan together.
Save energy without waiting for work to be carried out, while improving comfort and air quality?
It’s possible!

Energy audit: Why ?

In France, the law provides a framework for energy audits through the EN-16247 standard. This diagnosis is mandatory for all companies with more than 250 employees. It is the subject of a report sent to the Ministry of the Environment, Energy and the Sea.

For the companies concerned, performing an energy audit is above all an opportunity to make more energy savings on a daily basis, and to achieve a higher level of energy efficiency by setting a target for reducing energy consumption, and thus improve their energy performance.

Performing an energy audit to assess the building’s energy performance

The energy audit first allows to know the energy performance of the building. In the scope of a standard energy audit, there may be differences between the standard energy performance, i.e. the stated energy performance, and the actual performance of the building. The goal of this detailed energy study is to analyze the way energy expenses are allocated and to raise the auditor’s awareness.

What are the steps involved in performing an energy audit? The energy audit begins with a site visit, in order to collect as much data as possible about the thermal functioning of the building: its consumption and energy use. We are therefore focused on the structure and operation of the building: dpe, ventilation etc…

We then proceed to various readings in order to improve the energy efficiency of the building under study: temperature, VMC extraction rate etc… Our sensors take images of the building.

Finally, we modelize the building on a dedicated software and have access to a detailed inventory of the building to evaluate the energy consumption. The goal: To provide you with a set of recommendations, determine real ways of improvement, and set the framework of services to be implemented to provide you with solutions appropriate to your situation. Based on this complete analysis of building consumption, we are able to present you with a quantified report, and to explain to you what your charges and energy costs will be, as well as the potential savings to be made.

So, in which cases should you perform an energy audit? First of all, it can come from a voluntary approach to improve energy performance, for a private individual for example. Spending less energy to reduce costs, obtain a tax credit, get a bonus, improve comfort, increase your energy production, make the building healthier, or validate a certification: there can be many reasons to plan energy audits.

For large companies in the service sector and industry, on the other hand, energy audits are now mandatory. It must be renewed every 4 years.

réaliser un audit énergétique bâtiment tertiaire

The energy audit as a solution to identify points for energy improvement

By closely analyzing building consumption, the energy audit helps answer the question: “what steps can be taken to improve the energy efficiency of a building, while increasing comfort?”. This question is part of a dynamic of global reflection around goals related to the energy transition or energy performance.

The current climate and energy challenges require us to reduce our energy consumption as much as possible, to improve the energy efficiency of construction programs, particularly in the commercial building sector.

The audit highlights points for improvement to be taken advantage of when setting up an action plan. Indeed, it gives you an idea of the cost to be anticipated and which equipment will be the most cost-effective for optimizing the energy efficiency of buildings. At Oze Energies, the calculation of the energy signature of your construction projects is automated.

Plan an energy audit to define the energy optimization approach

The energy audit process precedes the implementation of an action plan to improve the energy efficiency of a building. This action plan is based on figures, such as the investment rate, the energy savings achieved and the time of return. It looks in more detail at the points needed to optimize energy performance.

So what type of actions can be taken to improve the energy performance of the programs? These may include insulation upgrades, changing or maintaining your heating boiler, or installing heating or solar panels.

Oze Energies allows you to perform a complete energy improvement process without any obligation to carry out any construction or renovation work. Thus, we take into account the weather forecast in our energy diagnostics to plan an energy expense of the buildings appropriate to the environment in which you find yourself. We install systems operating with sensors in your buildings. Some capture VOCs (Volatile Organic Compounds), others focus on fine particles, allowing us to analyze indoor air quality.

Finally, we guarantee you a continuous follow-up on the installations performed, in order to anticipate regulatory and technical evolutions. We help you achieve an average 25% energy savings, without necessarily planning renovation work on existing buildings.

Which companies are concerned by the mandatory energy audit?

The mandatory energy audit concerns large companies. The legal obligation applies to companies with more than 250 employees, or whose activities represent an annual revenue of more than 50 million euros. Companies whose consolidated balance sheet exceeds €43 million are also concerned.

French law and European legislation therefore regulate the consumption of the companies that consume the most energy. According to studies, approximately 5,000 French companies would be concerned.

Large companies: Audit to save money

It is estimated that performing regular energy audits would save about 50% of the energy spent by a company, depending on its sector of activity. An energy audit is an excellent way to identify areas of expense where you can make energy savings and thus improve your energy efficiency.

In order to be sustainable, an energy audit must be the starting point for the implementation of an energy strategy for the company.

It can help to initiate the construction of an energy management system, with the aim of obtaining ISO 5001 certification. Companies covered by this system are exempted from an energy audit, as the ISO standard has a higher value than the statutory energy audit.

The implementation of an energy management system goes further than the energy audit performed by the company. It is adapted more precisely to the specific requirements of the company and its development context.

The scope covered by an energy management system is wider than an energy audit in terms of energy efficiency improvements. It is a strategic device which, moreover, entitles you to the company energy savings certificate (CEE).

How to conduct a business energy audit?

Although it is possible to perform an energy audit for all companies wishing to improve their energy efficiency, the law provides a much more precise framework for the statutory energy audit to which large companies are subject.

Thus, article L233-1 of the energy code specifies that the companies concerned must submit, in the form of a report, all information relating to the requirement to conduct an energy audit. To do so, they have a platform for receiving energy audits, on the ADEME website.

The platform also makes an energy audit analysis grid available to decision-makers. It recalls the framework defined for the business energy audit, which also corresponds to the information that must appear in the audit report.

The business energy audit includes a data collection phase involving a visit to the buildings, a data analysis phase, the presentation of possible improvements and, finally, a report presenting the conclusions.

This analysis chart is particularly useful if you choose to conduct your business energy audit internally. Nevertheless, performing energy audits is regulated by law. To be of full value, it must be conducted by a certified professional.

Once your audit report is submitted, you are able to predict the costs of your various investments and fully engage the energy improvement strategy for your buildings.

Why choose Oze-energies?


We are certified by the global competitiveness cluster Finance-Innovation, ARSEG and Bpifrance's InvestNet label.


The presentation of solutions through a simple and effective report, assures you a real help in decision making before starting work.


Thanks to Optimzen GOLD, you can perform an average of 25% savings on your energy bills, without any work or while waiting to do it.


We have developed intelligent sensors and software to dynamically measure and optimize the building.

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Based on communicating sensors and artificial intelligence, Optimzen Gold allows to perform, without any work, savings on non-occupied energy consumption and to improve comfort and indoor air quality…