LEGO® Arch 1 x 3 (Part 4490)

The LEGO® Arch 1 x 3 (Part 4490) is a compact structural element used to create small curved openings and decorative architectural details in LEGO builds. Measuring three studs wide and one stud deep, this arch piece is commonly used for windows, doorways, and decorative wall features in modular buildings and custom models.

Key Features

• Compact 1 x 3 arch geometry suitable for small openings and architectural detailing.
• Smooth underside provides a clean finish when used in bridges, supports, or decorative elements.
• Compatible with standard LEGO® bricks and plates for stable integration into custom builds.
• Part number 4490 commonly used in architectural models and detailed MOCs.

Building Ideas

Builders often use this small arch piece for windows, decorative façades, vehicle details, and structural supports in bridges or tunnels. It can also be combined with plates, slopes, and tiles to create layered architectural patterns or rounded shapes in compact builds.

Explore additional elements in our LEGO® Arch Pieces collection.