Energetische Sanierung bei Altbauten - Sinnvolle Maßnahmen und ihr Einsparpotenzial

Many owners of older houses appreciate the special charm and solid construction of their old buildings. However, the standards for energy efficiency are now much higher than was usual when such houses were built. The result: high heating costs, noticeable drafts and uneven heat distribution. Professional energy renovation can remedy this. In our guide, we show which measures are particularly useful, how high the savings potential is and what you should pay attention to.

Table of contents

The most important things in brief

1. Energy savings: Targeted renovation – e.g. through better insulation and new windows – can reduce heating requirements by up to 50%.

2. Living comfort: Due to reduced drafts, more even heat distribution and improved air quality, well-being increases noticeably.

3. Increase in value: A building that has been renovated to be more energy efficient is usually worth more and is easier to sell or rent.

thermal insulation

Solid thermal insulation is the heart of any energy-efficient renovation. It prevents most heat losses and thus significantly reduces energy requirements.

facade insulation

Features: Depending on the construction method, different insulation systems (ETICS, curtain wall or interior insulation in listed buildings) can be used.

Advantages: By effectively insulating the exterior walls, heating costs can be reduced by up to 20-30%. At the same time, you improve living comfort.

roof insulation

Features: Can be used as over-rafter, between-rafter or under-rafter insulation. The roof is one of the largest surfaces through which heat can escape.

Advantages: Reduces heat loss by an additional 10-15%. The roof space stays cool longer in summer and comfortably warm in winter.

basement insulation

Features: Insulation of the basement ceiling or walls depending on the building structure and moisture protection.

Advantages: Complements the insulation package and prevents the floor areas on the ground floor from cooling down.

Window

Windows are often the “weak points” in the building envelope. Older models with poor insulation or leaky frames let a lot of heat escape.

  • Triple glazing: The latest window technologies with optimized frame profiles drastically reduce heat loss.
  • Avoid thermal bridges: When installing windows, careful sealing is crucial to avoid drafts.
  • Further advantages: Improved sound insulation and a pleasant living environment due to minimized cold radiation.

heating systems

Choosing the right heating system plays a crucial role in efficiency and costs. In old buildings, we often come across older oil or gas heating systems that need to be modernized or replaced.

condensing technology

Features: Gas or oil condensing boilers also make use of the heat contained in the exhaust gases. This means they work significantly more efficiently than older standard boilers.

Advantages: Energy savings of 10-20% compared to conventional boilers.

heat pumps

Features: Use environmental heat (air, earth or groundwater) for heating and hot water preparation.

Advantages: In combination with a good building envelope and low flow temperatures (e.g. underfloor heating) very energy efficient and climate-friendly.

biomass heating systems

Features: Wood pellet, wood chip or log boilers that burn renewable raw materials.

Advantages: Low-CO₂ heating method, regional fuel use, independence from fossil fuels.

Benefits & Savings Potential

  • Significant reduction in heating costs: In many cases, 30-50% of the previous heat requirement can be saved.
  • Increased living comfort: fewer drafts, more balanced room temperatures and better air quality.
  • Increase in value: A building that has been renovated to be energy efficient is more attractive on the real estate market.
  • Climate protection: Less energy consumption means lower CO₂ emissions and therefore active environmental protection.

Costs & Funding

The investment costs for an energy-efficient renovation can vary depending on the scope and initial condition. Nevertheless, it is worth looking at possible funding programs.

  • KfW & BAFA: In Germany, for example, the KfW banking group and the Federal Office of Economics and Export Control (BAFA) support energy-saving measures with grants or low-interest loans.
  • Federal states & municipalities: There are often additional subsidies or tax reliefs at the regional level too.
  • Economic efficiency: Thanks to lower energy costs, many renovation measures pay for themselves over the years.

Learn more about funding programs .


Tip: Energy advice from certified experts can help you determine the most sensible measures for your building and apply for the appropriate funding. This way you can maximize your energy savings and at the same time make a sustainable decision for the future. Request energy advice now!

At ganz24.com you will also find a wide range of products and solutions for energy-efficient renovation - from insulation materials to modern heating systems. Visit our online shop and discover innovative ways to make your home more efficient and comfortable.

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