Old windows are often made from high-quality, slow-grown timber and have a lifespan that often exceeds that of modern mass-produced windows.

Through targeted modernization, we improve:

• Energy efficiency
• Airtightness
• Ease of use
• Burglary protectionService life

The architectural character is fully preserved.

In our renovation, we combine traditional craftsmanship with modern window technology:

✅ Replacement with thermal insulation glass (Ug up to 0.7 W/m²K)
✅ Milling in additional seals
✅ Overhaul or replacement of historic fittings
✅ Upgrade to RC2 possible
✅ Bonding of the glazing rebate for stabilization
✅ Timber repairs & surface treatment
✅ Optimization of functionality and airtightness

Preserving existing windows saves large amounts of embodied energy.
Compared to replacing them with new PVC or timber/aluminum windows, several hundred kilograms of CO₂ per window can be avoided.

Upgrading historic windows is therefore often the most ecologically sensible renovation measure for a building.

• Older buildings
• City apartments
• Listed (heritage-protected) buildings
• Multi-family homes
• Villas & historic properties

Especially in urban areas — particularly in older buildings — window replacement is often neither necessary nor desired. With our expertise in window upgrading, we preserve the existing fabric and bring historic windows up to modern technical standards.