You’ve got a few no-drill options that can work in many homes:

1. Suction-cup floating shelves: Clean and dry the glass, position the cups, press firmly to remove air, and add any support legs included. Start with light items to test hold.
2. Clamp-on sill extenders: Measure your sill depth, slide the tray into place, and tighten clamps evenly so it sits level without marring the surface.
3. Hanging tiered shelves: Follow the included hanging method (such as rods or hooks) and balance weight across tiers.

Keep loads within the product’s stated capacity, avoid textured glass for suction cups, and recheck mounts periodically—conditions like temperature and humidity can affect adhesion over time.

Most folks simply call it a window sill or window ledge. If you’re looking to add extra space, you’ll also see terms like window sill shelf, floating window shelf, windowsill extender, clamp tray, or window plant shelf on product listings.

Built-in sills are part of the window area, while add-on shelves are accessories you attach to the glass, clamp to the sill, or hang nearby. On Walmart item pages, the product name and description usually specify the mounting style and intended use, which can help you match the right shelf to your space.

Window sills and window shelves are great for functional storage and display. Popular ideas include:

• Indoor plants: Succulents, herbs, or microgreens that benefit from sunlight.
• Seed starting: Small trays or pots in bright spots.
• Kitchen or bath items: Sponges, soap dishes, or small containers on a shelf extenders.
• Decor: Candles (unlit), picture frames, or small art pieces.
• Pet perches: Dedicated window platforms designed for pets.

Keep weight within the shelf’s stated capacity, distribute items evenly, and avoid heat-sensitive or water-heavy items that could stress the mount. Always follow the product’s instructions for surface compatibility and use.

Window sill: The built-in ledge at the base of the window opening. It’s part of the window area and not typically adjustable.

Window shelf: An add-on accessory that creates extra surface space. Common styles include suction-cup shelves that attach to the glass, clamp-on trays that grip the sill, and hanging tiers that suspend near the window.

Shoppers often choose shelves to give plants more sun, organize small items, or create display space without drilling. Before buying, review mounting method, surface compatibility, dimensions, and weight rating on the item page to help ensure a good fit for your window.

Start with your window and what you’re placing on it:

1. Measure width and depth: Note the clear glass area and sill depth so the shelf fits without blocking hardware or blinds.
2. Match the mount: Suction-cup shelves generally work best on smooth, clean glass; clamp trays need a compatible sill thickness; hanging styles need a secure anchor point.
3. Plan your load: Check the shelf’s weight capacity and the size of your pots or trays.
4. Consider tiers and material: Multi-tier units save space; clear acrylic keeps light flowing, while metal or wood changes the look and feel.

Review dimensions and specs on the item page before you decide.