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Energy Savings Certificates (ESCs) and Building Energy Renovation: An Opportunity for Homeowner Associations

  • FESA
  • March 17, 2026
NEWS

In the coming years, thousands of buildings in Spain will need to undertake energy renovation measures.

Rising energy prices, new European efficiency requirements, and public subsidy programs are driving actions such as:

  • façade renovation

  • improvement of thermal insulation

  • installation of ETICS systems (External Thermal Insulation Composite Systems)

  • renovation of thermal installations

However, many homeowner associations and property managers are still unaware that part of these actions can generate Energy Savings Certificates (ESCs).

These certificates allow the energy savings achieved by a building to be converted into additional economic value, improving the profitability of renovation works.

At FESA, a company specialized in façade renovation and energy improvement of buildings, we work with homeowner associations and property managers who aim not only to renovate a building, but to do so efficiently and with optimized economic performance.

In this article we explain:

  • what Energy Savings Certificates (ESCs) are

  • why they are directly related to building renovation

  • which actions in homeowner associations can generate them

  • and why it is important to work with companies specialized in energy renovation.

What Energy Savings Certificates (ESCs) Are

Energy Savings Certificates (ESCs) are a system promoted by the Ministry for Ecological Transition that allows the certification of energy savings achieved after an improvement in a building or installation.

Each certificate represents:

1 kWh of final energy saved.

These certificates can be purchased by energy companies that are legally required to meet energy saving targets.

This means that when a building reduces its energy consumption thanks to a technical improvement, that saving can be converted into an economic asset within the energy system.

In simple terms:

If a building reduces its energy consumption after renovation, those savings can generate certificates with economic value.

Why ESCs Are Directly Linked to Building Renovation

The ESC system is especially connected to actions that improve the energy efficiency of buildings.

These include:

  • improving thermal insulation

  • energy renovation of façades

  • installation of ETICS systems

  • renovation of heating systems

  • replacement of thermal equipment with more efficient systems

All these actions have a direct impact on the building’s energy consumption, making it possible to quantify the savings generated over many years.

For this reason, energy renovation of buildings has become one of the areas with the greatest potential for the ESC system.

Which Actions in Homeowner Associations Can Generate ESCs

Many common renovation actions in homeowner associations can generate energy savings certificates.

The most relevant ones are related to the building’s thermal envelope.

Energy Renovation of Façades

Improving the façade is one of the actions with the greatest impact on a building’s energy consumption.

A poorly insulated façade causes:

  • heat loss in winter

  • excess heat in summer

  • higher heating and cooling consumption

Façade renovations through:

  • ETICS systems

  • ventilated façades

  • improved insulation

can significantly reduce the building’s energy demand.

These savings can be certified within the ESC system.

Improving the Building’s Thermal Insulation

Improving insulation in:

  • façades

  • roofs

  • party walls

reduces the need for heating and cooling and improves indoor comfort in homes.

These actions also generate measurable energy savings over many years.

Renovation of Thermal Systems

Some homeowner associations take advantage of renovation works to upgrade:

  • central heating systems

  • old boilers

  • air conditioning systems

Replacing them with more efficient systems can also generate energy savings certificates.

What Benefits a Homeowner Association Can Obtain

The ESC system can provide several advantages when undertaking an energy renovation.

Improving the Profitability of Renovation Works

Energy renovation projects often require a significant investment from the community.

ESCs allow the generation of an additional economic return linked to the energy savings achieved.

Complementing Public Subsidies

In many cases, homeowner associations access:

  • European funds

  • regional subsidies

  • energy renovation programs

The ESC system can complement these subsidies, improving the economic feasibility of the project.

Reducing the Building’s Energy Consumption

Beyond the economic aspect, energy renovations allow:

  • reducing energy consumption

  • improving thermal comfort in homes

  • increasing the building’s value in the real estate market

The Role of Companies Specialized in Energy Renovation

To properly take advantage of the opportunities associated with energy efficiency, it is essential that renovation measures are correctly designed from the beginning.

For homeowner associations this involves:

  • carrying out a technical diagnosis of the building

  • properly defining renovation solutions

  • executing the works with energy efficiency criteria

At FESA we have years of experience in façade renovation and building energy improvement, working closely with property managers and homeowner associations.

Our approach is clear:

It is not just about renovating a building, but about doing so while optimizing its energy efficiency and long-term profitability.

ESCs and Energy Renovation: An Opportunity Many Communities Still Do Not Know About

The ESC system is still relatively new in Spain.

For this reason, many homeowner associations are carrying out energy renovations without taking advantage of the full potential offered by this mechanism.

However, everything suggests that Energy Savings Certificates will become increasingly relevant in financing energy improvements in buildings.

For property managers and homeowner associations, understanding this system can make the difference between:

  • a conventional renovation

  • or an energetically optimized renovation.

Conclusion

Energy renovation of buildings will be one of the major challenges for the Spanish building stock in the coming years.

Energy Savings Certificates (ESCs) represent a new tool that makes it possible to:

  • reduce the energy consumption of buildings

  • improve the comfort of homes

  • and generate additional economic value

However, to take advantage of these opportunities, it is essential to work with companies specialized in energy renovation and façade rehabilitation that know how to properly design these interventions.

Because when a building is renovated, it is not only its exterior appearance that improves.

Its efficiency, its value, and its energy future can also improve.