Saturday, November 8, 2025

Why Do Some Windows Have Curved Exterior Grilles? Here’s What They Really Do

 

Walking through the streets of many historic centers or residential neighborhoods, you’ve probably noticed windows with curved exterior grilles. But what is their purpose, and why aren’t they straight like more common ones? Let’s find out.

Curved Grilles: A Choice That Combines Safety and Practicality

Curved grilles, also known as rounded or belly grilles, are metal bars installed on the outside of windows, featuring a distinctive outward-curving shape. This design isn’t just an aesthetic detail—it serves very specific functional, practical, and architectural purposes.

What Are Curved Grilles For?

Here are the main reasons why some windows feature curved bars:

1. They Increase Usable Space

The outward curve creates extra space between the window and the grille, allowing you to:

  • Place flower pots or plants

  • Open the windows fully without obstruction

  • Let in more natural light

2. Greater Security

Curved bars are harder to tamper with than flat ones. Their shape makes it more difficult to use levers or burglary tools, improving protection against break-ins.

3. Traditional Aesthetics

In many historic towns or period buildings, curved grilles are an architectural element consistent with the style of the façade. Often made of wrought iron, they add a classic, decorative touch that enhances the building’s character.

Where Are They Most Commonly Found?






Where Are They Most Commonly Found?

Curved grilles are especially popular:

  • On ground-floor or mezzanine windows

  • In detached houses or historic buildings

  • In areas where home security is a concern

A Detail That Combines Beauty and Functionality

Today, many manufacturers offer custom-made curved grilles that perfectly match a home’s architectural style. Beyond their protective function, these features have become true outdoor décor elements, capable of enhancing even modern façades.

The blend of design and security is becoming an increasingly popular trend—offering both elegance and peace of mind.

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