24/12/25

PVC Windows in Historic Buildings: How to combine Old and New

Installing modern PVC windows in historic structures is a challenging task. The goal is to ensure comfort and energy efficiency without compromising the building’s historic appearance. Let’s explore how to achieve a harmonious blend of old and new.

Key Considerations When Selecting Windows

1. Shape and Proportions

• faithfully replicate original shapes — arches, trapezoids, transoms;
• preserve traditional sectioning if present in the original frames;
• maintain the historical ratio of glazed to solid areas.

2. Colour and Texture

• choose shades that match the building’s original colour scheme (typically white, brown, or grey);
• consider wood‑effect lamination to mimic traditional frames;
• avoid bright modern colours or glossy surfaces that look out of place.

3. Insulating Glass Units

• opt for double‑ or triple‑pane units for better thermal insulation;
• energy‑efficient coating (low‑emissivity glass) is beneficial;
• vintage‑look glass (textured or lightly tinted) can be used for authenticity.

Technical Solutions for Sensitive Installation

• Slim profiles (60–70 mm) — protrude less from the opening, preserving the façade’s visual lightness;
• Hidden hardware — hinges and mechanisms are placed inside, leaving minimal visible details outside;
• Ventilation valves — allow fresh air in without opening the sashes;
• Anti notched protection — especially important for ground floors; avoid external grilles that may spoil the appearance.

Installation Features

During installation, it’s crucial to:

• retain original reveals and casings if they have artistic value;
• use elastic seals to compensate for old wall shrinkage;
• include drainage channels for condensation removal;
• carefully check joint tightness — drafts are unacceptable, but excessive tension may damage historic masonry.

What to Avoid

• completely replacing historic frames with standard rectangular windows;
• using contrasting colours or glossy finishes that clash with the overall style;
• ignoring structural features (e.g., wooden lintels);
• installing windows without respecting the original design and proportions of openings.

Conclusion

Modern PVC windows in a historic building require balancing tradition and technology. To achieve a successful outcome:

• pay close attention to historical details (shape, colour, proportions);
• select specialised profiles and hardware suitable for delicate installation;
• engage experienced installers familiar with working on old structures.

This approach ensures a comfortable, energy‑efficient space while preserving the charm and uniqueness of the historic building.