New Windows in Old Buildings: What Owners Should Consider Before Ordering

Why new windows in old buildings are more than just a simple replacement

The charm of an old building is undeniable. However, behind historic facades often lie outdated windows that are not only visually aged but also represent significant weaknesses in terms of energy efficiency, sound insulation, and security. High heating costs due to escaping heat, disturbing noise from outside, and a feeling of insecurity are common problems that owners of old buildings face.

Replacing old windows with modern, energy-efficient models is therefore one of the most worthwhile investments in your property. It not only significantly increases living comfort but also contributes substantially to property value appreciation and the fulfillment of current energy requirements. However, especially in old buildings, window replacement is not a standardized undertaking. It requires extensive expertise, precise planning, and careful execution to account for the specific conditions of the building structure and prevent long-term damage.

As experienced window fitters for old buildings, we at VL-Innovativbau know what matters. We accompany you from the initial idea to the professional installation of your new windows and doors.

The Special Challenges of Old Buildings: From Reveals to Monument Protection

An old building differs in many respects from a new construction. These peculiarities place specific demands on planning and execution when replacing windows in old buildings:

• Individual Wall Thicknesses and Materials: Old buildings often feature heterogeneous wall constructions with varying thicknesses and materials. This requires a customized adaptation of window connections to prevent thermal bridges and moisture problems.
• Handling the Window Reveal: The window reveal is the interface between the window frame and the wall. Improper sealing or connection can lead to drafts, moisture ingress, and mold formation. Professional sealing according to DIN 18545 is crucial here for energy efficiency and durability.
• Thermal Separation and Thermal Bridges: Old windows are often cold bridges. During renovation, it must be ensured that no new thermal bridges are created that could lead to condensation and mold. The requirements of DIN 4108 and the Building Energy Act (GEG) must be observed here.
• Monument Protection Requirements: For listed old buildings, the hurdles are often higher. Here, material, shape, color, and even the type of glazing can be subject to strict regulations. Approval from the monument protection authority is mandatory. VL-Innovativbau possesses expertise in dealing with historical specifications and provides comprehensive advice on old building window monument protection-compliant solutions.

This complexity makes it clear: window replacement in old buildings is not a task for amateurs. Only an experienced specialist company can master these challenges and guarantee a flawless, energy-efficient solution.

Material Selection and Glazing: The Right Balance of Aesthetics and Energy Efficiency

Choosing the right window material and suitable glazing is crucial for the aesthetics of your old building and its future energy balance. Modern windows offer a variety of options here:

Window Materials for Old Buildings

• Plastic Windows (PVC): They are easy to maintain, durable, and offer excellent thermal insulation. Modern plastic profiles are available in many colors and decors (e.g., wood look) that can integrate well into the appearance of an old building. They are often a cost-effective solution for renovating old building windows.
• Wooden Windows: They emphasize the traditional character of an old building and offer a natural aesthetic. Wood is a renewable resource and creates a pleasant indoor climate. However, wooden windows require more maintenance.
• Aluminum Windows: Robust, durable, and available in slim profiles, they are particularly suitable for modern old building renovations or where large glass surfaces are desired. They are very weather-resistant and easy to maintain.
• Wood-Aluminum Windows: This combination unites the best of both worlds: wood on the inside for a warm appearance and good insulation values, aluminum on the outside for maximum weather protection and low maintenance. An ideal solution for high demands on aesthetics and durability.

Modern Glazing: U-Value and Sound Insulation

The glazing is the core of your new windows and largely responsible for the energy efficiency of old building windows. The U-value (heat transfer coefficient) indicates how much heat is lost through a window. The lower the U-value, the better the insulation.

• Double Glazing: A basic solution that often already meets the requirements of the GEG but does not exploit its full potential.
• Triple Glazing: This is now the standard for maximum energy efficiency. It significantly lowers the old building window U-value, reduces energy consumption, and ensures a comfortable indoor climate.
• Special Glazing: For special sound insulation in old buildings, special sound-insulating glazing is available that effectively reduces external noise. Security glazing (burglar protection) is also a useful addition to increase security in old buildings.

At VL-Innovativbau, we are happy to provide comprehensive advice on suitable materials and glazing that meet your individual requirements and the character of your old building. Use our window configurator to gather initial ideas.

Professional Window Installation: The Key to Lasting Comfort and Value Retention

Even the best windows are of little use if they are not professionally installed. In old buildings, professional window installation in old buildings must be carried out to avoid future problems. Improper installation can have serious consequences:

• Thermal Bridges and Moisture: Faulty connections and seals lead to