An adaptable fence extension assembly integrates into a fence having metal T-posts and wooden posts. The assembly fixedly attaches to the termini of the fence posts. The assembly comprises an arc-shaped member that increases the height, depth, and visibility of the fence. The arc-shaped member has an interior channel having a spine that runs along the length of the interior channel. A longitudinal slot and tine enable fastening to the fence posts. When integrated into a metal T post, the longitudinal slot receives a metal T post terminus for fastening thereto. Cleats protruding from the tines, provide slots for the securing of the assembly with wire to a metal t-post. The slots provide a channel for screws and nails when attaching the assembly to wooden post. A concave side of the arc-shaped member includes a U-shaped cavity having an inlet and a narrow cavity terminus for retaining electric cable.