Golden Ratio Windows is a specialist in Heritage Sash Window Restoration, ensuring every project meets strict architectural and conservation standards.

Architecturally Correct Sash Windows: The Golden Ratio of Joinery

Architecture is a balance of mathematics and art.

When it comes to period properties—whether Georgian, Victorian, or Edwardian—the windows are the "eyes" of the building. Replacing a sash window with one that is "near enough" doesn't just lose a window; it loses the soul of the house.

1. The Anatomy of Authenticity

An architecturally correct window respects the specific era of your home. We focus on three critical elements that mass-produced windows consistently get wrong:

If your frames are structurally sound but lack these details, our workshop can perform specialist sash window repairs to restore their original character.

2. Advanced Materials: Accoya® & Slimline Glass

Architectural integrity shouldn't mean a cold house. We utilize Accoya® timber for unmatched stability and Slimline Heritage Double Glazing.

Our slimline units are so thin they fit into traditional timber rebates, providing modern sash window energy efficiency without the bulky "double reflection" look. This technology is essential for meeting heritage and conservation requirements in London.

Heritage Architecture FAQ

What makes a sash window "architecturally correct"?

It means the window adheres to the exact proportions, moulding profiles, and joinery techniques of its specific era (Georgian, Victorian, or Edwardian). This includes the slimness of the meeting rail and the use of traditional timber finishes.

Do I need planning permission for heritage windows?

In Conservation Areas or Listed Buildings, yes. However, opting for architecturally correct timber windows significantly increases your chances of approval, as they are seen as a restoration of the building's character.