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SKU 700107

Square Box 4 in. Metallic 30.3 cu. in.

Original price $4.08 - Original price $4.08
Original price
$4.08
$4.08 - $4.08
Current price $4.08
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About This Product For installing and enclosing wiring for electrical switches and outlets, use the 2-Gang Square Electrical Box. This box includes...

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SKU 461892

Handy Box Steel 4 in. 2-1/8 in.

Original price $2.16 - Original price $2.16
Original price
$2.16
$2.16 - $2.16
Current price $2.16
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About This Product Created with 10 knockouts, the 1-Gang Handy Box can accommodate numerous configurations. Constructed from steel, it holds a UL c...

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SKU 730162

Electrical Box 47 cu. in. PVC 2-Gang New/Old Work

Original price $5.09 - Original price $5.09
Original price
$5.09
$5.09 - $5.09
Current price $5.09
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About This Product This versatile electrical box is suitable for both new and existing work projects. It can be installed horizontally or verticall...

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SKU 457818

Electrical Box 24.5 cu. in. 1-Gang PVC New/Old Work

Original price $2.38 - Original price $2.38
Original price
$2.38
$2.38 - $2.38
Current price $2.38
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About This Product This versatile electrical box is suitable for use in both new and existing work projects. It can be installed either horizontall...

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SKU 307306

Electrical Switch/Receptacle Box 500 and 700 Series Wiremold

Original price $13.42 - Original price $13.42
Original price
$13.42
$13.42 - $13.42
Current price $13.42
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About This Product Small surface metal raceway systems are perfect for homeowners looking to extend circuits or communication cabling within their ...

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SKU 663898

Starter Box 4.8 in. for 500 and 700 Series Wiremold

Original price $11.48 - Original price $11.48
Original price
$11.48
$11.48 - $11.48
Current price $11.48
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About This Product Small surface metal raceway systems are an excellent option for homeowners looking to extend circuits or communication cabling w...

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SKU 836347

PVC Floor Box with Two 3/4 in. and 1 in. HUBS BS

Original price $33.00 - Original price $33.00
Original price
$33.00
$33.00 - $33.00
Current price $33.00
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About This Product Effortlessly and efficiently install dependable new electrical outlet boxes and switch boxes with our Round Floor Box for Concre...

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SKU 278447

Gangable Box 1-Gang Steel Old Work.

Original price $10.63 - Original price $10.63
Original price
$10.63
$10.63 - $10.63
Current price $10.63
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About This Product The 1-Gang Device Box is constructed from steel for long-lasting strength. It includes 8 knockouts to accommodate different conn...

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SKU 810573

Fuse Box Cover 2-1/4 in. with Switch SSU Series

Original price $22.49 - Original price $22.49
Original price
$22.49
$22.49 - $22.49
Current price $22.49
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About This Product Single Fuseholder 2-1/4 in. Handy Box Cover Unit Featuring Switch for 1/2 Hp Motor, 15Amp 125Volt. Not suitable for DC applicati...

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SKU 664843

Box Old Work Single Gang 14 cu. in.

Original price $2.74 - Original price $2.74
Original price
$2.74
$2.74 - $2.74
Current price $2.74
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About This Product Install dependable new electrical outlet boxes and switch boxes with ease using our electrical outlet box and switch box featuri...

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SKU 886526

Electrical Box for Wood Sub-Flooring with Pop-Up Floor Outlet 15A TR Duplex Receptacle Brass

Original price $51.70 - Original price $51.70
Original price
$51.70
$51.70 - $51.70
Current price $51.70
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About This Product Enhance the durability and safety of your space with discreet pop-up floor box outlets that match your flooring choice. Our elec...

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SKU 948962

Electrical Box Round New Work Blue Polycarbonate 20 cu. in.

Original price $2.45 - Original price $2.45
Original price
$2.45
$2.45 - $2.45
Current price $2.45
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About This Product The 1-Gang 20 cu. in. ceiling box is designed for ceiling fixtures weighing up to 50 lbs. It features 6 built-in clamps to keep ...

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SKU 076723

Media Box 1 Gang Recessed TV with Low Voltage Brush Insert, White

Original price $20.68 - Original price $20.68
Original price
$20.68
$20.68 - $20.68
Current price $20.68
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About This Product Today's homeowners have more multimedia options than ever, including wall-mounted flat-panel televisions. Recessed TV boxes prov...

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SKU 820477

Wall Mount Box 4 in. D x 8 in. W x 8 in. H Carbon Steel Gray Screw-Cover (1-Pack)

Original price $52.65 - Original price $52.65
Original price
$52.65
$52.65 - $52.65
Current price $52.65
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About This Product The NEMA 3R enclosure is intended for use as either a wiring or junction box, offering indoor protection from dripping water. Ad...

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SKU 461138

Wall Mount Box 10 in. H x 4 in. W x 10 in. D Carbon Steel Gray Screw-Cover N3R (1-Pack)

Original price $66.78 - Original price $66.78
Original price
$66.78
$66.78 - $66.78
Current price $66.78
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About This Product The NEMA 3R Enclosure is intended for use as a wiring box or junction box and offers protection from snow, sleet, and rain outdo...

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SKU 415886

Electrical Box Extender PVC Multi-Gang (2-Pack)

Original price $8.38 - Original price $8.38
Original price
$8.38
$8.38 - $8.38
Current price $8.38
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About This Product The Multi-Gang Non-Metallic Box Extender is intended for installation on non-metallic boxes to align flush with the surface. Thi...

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SKU 400728

Handy Box Cover Metallic Duplex

Original price $1.09 - Original price $1.09
Original price
$1.09
$1.09 - $1.09
Current price $1.09
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About This Product Finish the setup of a duplex outlet using the 1-Gang Duplex Receptacle Cover. This cover is designed to resist corrosion and can...

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SKU 350758

Handy Box Metallic 1 Toggle Cover

Original price $1.52 - Original price $1.52
Original price
$1.52
$1.52 - $1.52
Current price $1.52
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About This Product Safeguard the internal components of an electrical switch with the 1-Gang Toggle Switch Cover. This cover features a zinc-plated...

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SKU 691707

Floor Box Outlet Cover Low-Profile Round with 2 Lift Lids, Gray

Original price $19.00 - Original price $19.00
Original price
$19.00
$19.00 - $19.00
Current price $19.00
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About This Product Opt for stronger, safer, and discreet round floor box outlet covers that match your flooring choice. Our floor box cover is craf...

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SKU 559026

Floor Box Outlet Cover Low-Profile Round with 15A TR Duplex Receptacle and 2 Lift Lids Brass

Original price $84.19 - Original price $84.19
Original price
$84.19
$84.19 - $84.19
Current price $84.19
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About This Product Enhance your flooring with durable, secure, and discreet round floor box outlet covers. Our floor box cover is constructed from ...

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SKU 415679

Weatherproof Cover 1-Gang Industrial Grade for Flanged Devices Gray

Original price $18.34 - Original price $18.34
Original price
$18.34
$18.34 - $18.34
Current price $18.34
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About This Product Compatible with 3-, 4-, or 5-Wire 20 Amp and 30 Amp Locking Flanged Inlets or Outlets. Typical uses for industrial-grade weather...

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SKU 713076

Electrical Box for Wood Sub-Flooring with 15A TR Duplex Receptacle Brass Floor Box Kit with Screw Caps

Original price $46.20 - Original price $46.20
Original price
$46.20
$46.20 - $46.20
Current price $46.20
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About This Product Choose durable, secure, and discreet floor box outlets that enhance your flooring selection. Our electrical box is constructed f...

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SKU 670047

Electrical Switch and Outlet Box 34 cu. in. Gray Old Work Residential 2-Gang Heavy Wall with EZ Mount Clamps EZ Box

Original price $9.58 - Original price $9.58
Original price
$9.58
$9.58 - $9.58
Current price $9.58
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About This Product Install dependable new electrical outlet boxes and switch boxes quickly and easily with our Heavy Wall Electrical Outlet Box and...

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SKU 545131

Ceiling Box Cover

Original price $5.83 - Original price $5.83
Original price
$5.83
$5.83 - $5.83
Current price $5.83
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About This Product Ceiling Box Cover designed for covering unused 3-1/2 in. and 4 in. round and octagonal boxes before installing a fan or fixture....

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Electrical Boxes: What You Need to Know

Electrical boxes, also referred to as conduit fittings or enclosures, are essential components for securing and routing electrical wiring in both indoor and outdoor environments. Available in waterproof options, these boxes are designed to resist moisture ingress and protect internal wiring from rain, splashes, or damp conditions, ensuring long-term safety and performance. Sizes range from ¼ inch to 12 inches, and shapes include both round and square formats to match various mounting requirements.

Type:

  • Boxes & Brackets: Used to house electrical connections and support wiring infrastructure. They offer stability and protection for both conduit and wiring assemblies in walls and ceilings.
  • Covers: Designed to seal conduit openings and protect internal wiring from dust and moisture. They are essential for safety, insulation, and code compliance in open junctions.
  • Weatherproof Boxes: Built to endure moisture, dirt, and corrosion in outdoor and damp locations. They are commonly used in exposed electrical systems, especially in residential and light commercial construction.

Shape:

  • Round: Typically used for lighting fixtures and ceiling fan boxes. Their curved design fits standard round electrical applications and promotes balanced weight distribution.
  • Square: Ideal for mounting switches and outlets, especially in drywall or masonry walls. Their boxy shape provides more internal space for wire connections and flexibility in installation.

At Supply Ontime, we offer reliable materials designed to meet your project’s needs. With same-day delivery across the Greater Los Angeles area, we make it easy to keep your projects on schedule. Order Electrical Boxes now and get them delivered today!

Electrical Boxes FAQ

Are weatherproof electrical boxes required in Los Angeles?

Weatherproof electrical boxes are required anywhere wiring is exposed outdoors in Los Angeles. For receptacles, extra-duty in-use covers are typically required to protect devices while cords are plugged in, helping boxes stay compliant and safe in wet or coastal conditions. Their job is to shield connections from rain, dust, and moisture, which is especially important in coastal areas where salt air accelerates corrosion. Common materials include heavy-duty PVC, polycarbonate, and die-cast metal, paired with gasketed “in-use” covers that keep devices protected even while cords are plugged in. Always follow the latest code and listing requirements for the specific location.

What sizes of electrical boxes are available for delivery in Los Angeles?

The sizes of electrical boxes available for delivery in Los Angeles span a wide range and are rated by volume (cubic inches) to ensure there is enough free space for conductors and devices. Common volumes include 18, 20, 22, and 25 cu in for single-gang boxes, with deeper or multi-gang options for added devices and conductor counts. Choosing the correct size prevents overcrowding, supports proper heat dissipation, and helps meet code fill calculations—especially important when adding GFCI/Smart switches or pigtails during remodels.

Frequently asked question

Yes, electrical boxes can be delivered the same day in Los Angeles. Supply Ontime offers fast drop-offs—often within a few hours when in stock—or you can book a scheduled two-hour window to match inspection times or crew starts. Delivery choices include Truck Bed Delivery, Curbside Delivery, and White Gloves Delivery (first-door placement), so materials reach homes, apartments, and active jobsites without disrupting the schedule.