Best Retrofit Concrete Floor Box Solutions for Renovations
Finding the right retrofit concrete floor box depends on your installation needs and the type of space you’re wiring. This guide highlights five solid options, explaining who each is best for, and why they stand out. It’s ideal for contractors and DIYers upgrading existing concrete floors or planning new installations in garages, basements, or commercial spaces. The table below compares key details to help you compare at a glance.
| Product | Best For | Material | Notes |
|---|---|---|---|
| Arlington FLBC4500 | New concrete floors, low-profile installs | Plastic | Low voltage divider and mud cover included |
| Leviton FBBOX-GY | 2-gang power and data in concrete | PVC | Requires FBLEV-GY and plate sold separately |
| Lew Electric FBKIT | Round box projects, standard 4.5″ ID | PVC | Includes LRA-U adapter ring |
| Hubbell Raco 5511 | Concrete pours with 3/4″ and 1″ hubs | Nonmetallic | Round, 5″ inside diameter, gray |
| Arlington FLBC4580 | Existing or new concrete, 4.5″ ID boxes | Plastic | Brass or Nickel finish, includes 15A Decora outlet |
Arlington FLBC4500 Concrete Floor Box
The Arlington FLBC4500 is designed for new concrete installations with a low-profile footprint. It uses a plastic body and includes a mud cover, which helps conceal wiring while maintaining a clean finish. Best for projects that require simple, durable integration in fresh pours. This model is suitable for buyers prioritizing straightforward installation over heavy-duty metal construction, and who want a cost-effective option with built-in organization features.
Who it’s best for: contractors and homeowners installing new concrete floors who want an economical, easy-to-wire box with a low profile. Why selected: it simplifies wiring with a practical mud cover and integrated divider, reducing setup steps. Caution: ensure compatibility with downstream finishes and following local code requirements for low-voltage work.
Leviton 2-Gang Concrete Floor Box System, FBBOX-GY
The Leviton FBBOX-GY system is built for 2-gang power and data applications in concrete floors. It requires adding the FBLEV-GY and a finished floor plate (sold separately). This option is best for projects needing a larger, data-capable box without metal housings. It’s preferable for renovations where data and power must coexist with careful conduit management.
Who it’s best for: professionals planning 2-gang power/data runs in concrete floors, and DIYers who want a modular approach. Why selected: offers flexibility with additional components for a complete finish. Caution: read compatibility notes for required accessories and ensure proper layout for conduit reducers.
Lew Electric FBKIT Round PVC Floor Box
The Lew Electric FBKIT is a 5″ round PVC floor box designed for concrete floors and includes an LRA-U adapter ring. It uses a standard outside diameter around 5″, with an inside diameter of 4.5″. This selection is best for clients needing a round, compact solution that fits typical concrete pours. It’s a reliable choice when a round footprint is preferred for coordinated outlets or decorative finishes.
Who it’s best for: projects requiring a classic round box with adapter ring compatibility. Why selected: matches common round box sizing and offers straightforward installation. Caution: verify inside diameter clearance in your specific concrete assembly before proceeding.
Hubbell Raco 5511 Round Floor Box
The Hubbell Raco 5511 is a round, nonmetallic floor box designed for concrete pours with 3/4″ and 1″ hubs. It comes in a compact 5″ inside diameter and gray finish, making it suitable for installations where a nonmetallic housing is preferred. Best for lightweight applications or where metal allergy considerations exist. It’s a compact option that keeps routing simple in smaller slabs.
Who it’s best for: renovations needing a nonmetallic, lightweight option with flexible hub sizes. Why selected: compact 5″ inside diameter supports tight layouts. Caution: confirm hub size requirements and volume capacity for your outlets before purchasing.
Arlington FLBC4580 Nickel Recessed Floor Box
The Arlington FLBC4580 is designed for concrete floors and accommodates both new and existing installations. It supports 4.5″ inside diameter round PVC boxes and offers a nickel cover. Best for projects needing a finished, durable look with a Decora-style 15A outlet included. This option balances aesthetics with practical utility in mid-size floor boxes.
Who it’s best for: installers prioritizing a nickel-plated finish with an integrated outlet. Why selected: pairs a clean, contemporary look with reliable performance in concrete slabs. Caution: verify compatibility with your PVC box size and cover choice to ensure a proper fit.
Orbit PFLB-R-C Round PVC Floor Box
The Orbit PFLB-R-C Round PVC Floor Box is designed for concrete slab installations. It offers round PVC construction suitable for standard pours. Best for straightforward, round-box projects where a simple, reliable housing is the priority. It is a practical choice for consistent layouts and easy wiring access.
Who it’s best for: installers seeking a basic, round PVC option with predictable dimensions. Why selected: simple design reduces installation complexity. Caution: confirm exact diameter and height fit within your slab and cover options.
Buying Guide: Key Considerations for Retrofit Concrete Floor Boxes
What size round or rectangular box should I choose? Consider the inside diameter and height to ensure your outlets, data jacks, and wiring will fit without crowding.
Metal vs nonmetallic: Nonmetallic boxes are lighter and can be easier to work with, while metal boxes may offer more durability in high-traffic areas. Choose based on environment and load expectations.
Conduit and hubs: Check hub sizes and the number of conduits you’ll run. Some models support multiple hubs or require reducers for data and power lines.
Finish and aesthetics: If the floor box is visible, finishes like nickel or brass can enhance the room’s look. Consider whether the finish is per project spec and durable against wear.
Outlets included: Some kits include a 15A Decora outlet; others require you to purchase plates separately. Plan for required outlets and finishes in advance.
Frequently Asked Questions
Do I need a mud cover for concrete floor boxes? A mud cover helps conceal wiring and adds a neat finish, especially for new pours.
Can I mix and match components like boxes and plates? Yes, many manufacturers sell compatible components separately to tailor to your install needs.
Is round or rectangular better for data and power? Round boxes often fit standard installations, while rectangular ones can accommodate more outlets or data ports in a single box.
What installation considerations matter in retrofit projects? Verify box size versus existing slab dimensions, ensure proper seal against moisture, and follow local electrical codes for concrete installations.
Note: This article cites the listed product features to assist buyers in selecting a retrofit concrete floor box. Always verify current specifications on the retailer page before purchasing.