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.