Knockout Panel

Knockout Panel is a predefined, removable section in a building component, such as a wall, panel, or electrical box, designed to be easily removed to allow for future expansion, installation of additional services, or access to utilities.

Where You’ll Find Knockout Panels

• Electrical boxes and panels: The round or rectangular slugs on the sides of junction boxes and breaker panels. Electricians punch them out with a screwdriver and hammer to run conduit or cable into the box.
• Foundation walls: Precast or formed concrete panels with scored sections that can be broken out later for utility penetrations (water, sewer, HVAC).
• Drywall and partition walls: Sections framed and finished but designed for easy removal if a future doorway, window, or pass-through is needed.

Practical Example

A commercial tenant build-out spec calls for a future server room expansion. The architect places a knockout panel in the demising wall so the tenant can open it up later without structural demo. On the electrical side, the panel box ships with a dozen knockouts so the electrician only opens the ones needed for the current circuit runs.

Knowing material costs upfront helps you price knockout work accurately. Projul’s live construction cost database tracks real-time pricing so your estimates stay competitive.