Junction box costs range from low‑price indoor models ($10‑$60) to weatherproof units ($70‑$450), with installation averaging $100‑$300 depending on location and materials. Check each product page for other buying options. The final price depends not only on the box itself, but also on. Find electrical and lighting junction boxes in various amperages to suit different applications. Our screwless. The Home Depot is the place to shop when your home improvement project requires electrical conduit, electrical boxes, conduit fittings, electrical covers, cable raceways and all things related to electrical. 10 Rack-A-Tiers Open Splice Junction Box Single UL Listed, One-Piece Junction Box Splice Box. Repair Open Splices, 5 Second Installation, Electrical Junction Box, Wire Junction Box JB400. Junction box installation costs $100 to $300 for parts and labor, depending on the installation location, accessibility, and the electrical box size, material, and indoor or outdoor rating.
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