You may have seen window grilles that curve outward instead of lying flush against the window frame. This eye-catching feature—often referred to as a “belly” or “bulge” design—isn’t just for looks. It serves both functional and decorative purposes.
Added Space for Everyday Use
One of the main benefits of outward-curving window grilles is the extra room they create. This space can be especially useful in the following ways:
Planter Support: The extended design offers a perfect spot for flower pots or small herb gardens, adding a touch of greenery and charm to your home’s exterior.
Air Conditioner Clearance: In older buildings where window-mounted AC units are common, the curved grille provides enough clearance for proper airflow while maintaining security.
Safety Meets Style
While traditional window bars focus solely on protection, the curved design strikes a balance between security and aesthetics. Made from materials like wrought iron or steel, these grilles are both strong and stylish, often enhancing a home’s architectural character.

If you’re planning to install them, it’s wise to invest in professional installation. Properly mounted grilles ensure safety and stability, especially if you’re placing items like planters or air conditioning units in the space they provide.
Part of a Bigger Security Strategy
Keep in mind that window grilles are just one layer of home security. For the best protection, they should be combined with solid doors, alarm systems, motion lighting, and other modern safety measures.
So the next time you spot a window grille with a distinctive outward curve, you’ll know it’s more than just a design choice—it’s a clever blend of form and function.