Residential wiring is the system of wires and cables that distributes electrical power throughout a home. It includes NM-B for receptacles and lighting; UF-B for outdoor runs; THHN/THWN-2 and XHHW-2 conductors in conduit; service-entrance cable; underground residential distribution (URD) cable; mobile-home feeder; grounding wires; and low-voltage cables.

The global residential building wire and cable market was valued at $34.08 billion in 2022, with a projected 6.25% compound annual growth rate through 2028, according to Research and Markets. Low-voltage products accounted for the largest share, at more than 43% in 2022, according to TechSci Research.

Demand comes from both new construction and work on existing homes. In September 2026, U.S. housing starts ran at a seasonally adjusted annual rate of 1.221 million units, including 859,000 single-family starts, while building permits ran at a seasonally adjusted annual rate of 1.4 million units, according to the U.S. Census Bureau. New residential construction creates demand for branch-circuit wiring and service and feeder conductors.

Renovation also adds steady demand. The U.S. housing stock reached a median age of 44 years in 2023, the oldest on record, according toHarvard's Joint Center for Housing Studies.

Household loads are also growing due to new devices in the home. EV chargers, heat pumps, electric water heaters, induction ranges, workshops, and solar and battery systems often require dedicated circuits or larger service and feeder sizes. That shifts part of the market from the standard  12- and 14-AWG branch-circuit wire to larger copper and aluminium conductors.

Main residential product groups:

• NM-B: dry indoor branch circuits

• UF-B: wet locations and direct burial

• THHN/THWN-2 and XHHW-2: individual conductors in conduit

• SER and SEU: service entrance and feeders

• URD and mobile home feeder: underground service and distribution

• Low-voltage cable: thermostat, security, coaxial, data, and control

Manufacturers vs. suppliers. Southwire, Cerrowire, and Prysmian | Encore Wire are among the major U.S. building wire manufacturers. Retailers and distributors such as Home Depot, Lowe's, Graybar, Platt, and Nassau National Cable sell their products. Romex® is a Southwire brand, and Cerrowire makes CerroMax NM-B. Prysmian completed its acquisition of Encore Wire on July 2, 2024.

The best residential supplier depends on the job. A homeowner adding a receptacle has different needs from an electrician wiring a whole house or running a 200-amp feeder. These are the strongest options for all types of residential wiring needs.

1. Nassau National Cable: Best Overall for Residential Wire Selection

Best for: Whole-home wiring, feeders, service cable, underground runs, larger conductor sizes, and buying wire online.

Nassau National Cable (NNC) is the most wire-focused supplier on this list. Wire and cable is its core business, and its catalogue covers both everyday household wiring and heavier conductors in a home's electrical system.

The copper building wire catalog includes NM-B, UF-B, THWN-2, XHHW-2, SER, and SEU. NNC also stocks aluminum SER, SEU, and XHHW-2, aluminum URD, and mobile home feeder from 100 to 200 amps, plus thermostat, coaxial, and data cables.

NNC’s advantage is its depth in larger residential feeder and service cable.

Main advantage: Broad residential wire selection, with strong coverage of larger aluminum feeder and service sizes, including SER, SEU, URD, mobile-home feeder, XHHW-2, and THHN/THWN-2.

Potential drawback: NNC sells primarily online, so it can't replace a nearby store when you need a small amount of common wire today.

2. Home Depot: Best for DIY Projects and Same-Day Purchases

Best for: Repairs, small renovations, standard branch circuits, and local pickup.

Home Depot is the most straightforward option for most homeowners. Its store network, online inventory, delivery, and same-day pickup make it the easy choice when convenience matters more than every possible wire configuration.

For NM-B, shoppers will mostly see two brands: Southwire Romex SIMpull and Cerrowire CerroMax. Romex is a Southwire trademark, even though people often use the term to refer to any NM-B cable.

Home Depot is convenient for small residential projects because you can buy the wire and other electrical supplies in one trip.

Main advantage: Common residential cable is easy to find and pick up locally.

Potential drawback: Larger feeders and uncommon aluminum sizes are stocked less consistently in stores than at a wire specialist.

3. Lowe's: Best for Southwire Residential Products

Best for: Buyers who want Southwire products across both branch-circuit and feeder wire.

Lowe's is another strong choice for standard residential wiring, and its wire aisle leans heavily on Southwire.

Lowe's carries Romex SIMpull NM-B in common branch-circuit sizes, plus some aluminum feeder cable sold by the foot.

Brands to know: Mainly Southwire, including Romex SIMpull NM-B and its aluminum feeder cables.

Main advantage: A strong Southwire range from everyday NM-B to larger feeder cable.

Potential drawback: In-store stock varies, especially for larger and less common conductors.

4. Menards: Best Big-Box Option for Feeder and Service Wire

Best for: Midwest homeowners and contractors whose projects need more than basic NM-B.

Menards is a Midwest home-improvement chain with more than 300 stores across 15 states, including Illinois, Indiana, Iowa, Michigan, Minnesota, Ohio, Wisconsin, and several neighboring states. Its electrical wire range is broader than that of many big-box retailers, with options for both standard branch-circuit wiring and larger residential feeder and service applications.

Main advantage: A wider selection of wire than many home centres, plus general building materials.

Potential drawback: Menards' stores are concentrated in the Midwest, so it isn't an option nationwide.

5. Platt Electric Supply: Best for Professional Electricians

Best for: Electrical contractors and larger residential installations.

Platt Electric Supply is an electrical distributor with branches across much of the western U.S.

It is geared toward electricians because the catalog is organized around professional electrical categories, conductor specifications, and job quantities rather than homeowner projects. Contractors can check branch and company-wide stock, order larger quantities, and arrange pickup or delivery through the distributor network.

Main advantage: Trade-focused purchasing with local branch access and a broad building-wire catalog.

Potential drawback: Its physical branch network is concentrated in the western U.S., and the site is less intuitive for occasional DIY buyers.

6. City Electric Supply: Best for Local Contractor Support

Best for: Contractors who want to work with a local electrical supply branch.

City Electric Supply (CES) sells through a network of 677 branches across 32 U.S. states, with additional locations in Canada and Puerto Rico. It combines local electrical distribution with wire-cutting services and delivery, making it primarily a contractor-oriented supplier rather than a national consumer retailer.

For residential contractors, CES can cut wire to custom lengths, parallel conductors on one reel, and add pulling heads for larger jobs.

That makes CES a good fit for repeat professional buyers who value a relationship with a local branch and need help sourcing specific material.

Main advantage: Local branch service, custom wire cutting, and support for complete electrical orders.

Potential drawback: Stock and brands can differ from branch to branch, unlike a single centralized online catalog.

7. Graybar: Best for Large Residential and Multifamily Projects

Best for: Contractors, multifamily construction, major renovations, and large building wire orders.

Graybar makes the most sense when residential work reaches the scale of a large custom home or multifamily development.

Cerrowire is a residential brand in Graybar's catalogue, with NM-B available in coils and 1,000-ft reels sized for contractors. There is also a large communications catalog.

Brands to know: Cerrowire is among the building wire brands, with others varying by category.

Main advantage: A strong fit for professional, high-volume electrical purchasing.

Potential drawback: Some items can't be ordered online and require a call to customer service.

8. Grainger: Best for Maintenance and Property Management Purchasing

Best for: Property managers, maintenance teams, and buyers who already use Grainger for other supplies.

Grainger is primarily a maintenance, industrial, and facility-supply company rather than a residential electrical retailer. Its building-wire selection is still substantial, however, and includes products such as Southwire Romex SIMpull NM-B, along with a wide range of electrical, maintenance, safety, and facility supplies.

Grainger is most useful for property managers, maintenance teams, and contractors that already buy other supplies through the company. They can add building wire to an existing business order rather than sourcing it separately from a home improvement or electrical retailer.

Brands to know: Southwire Romex is a recognisable residential brand at Grainger.

Main advantage: Wire can be ordered together with maintenance, tool, and facility supplies.

Potential drawback: Grainger doesn't focus on residential construction and may not be the cheapest place to buy a whole-house worth of NM-B.

Which Residential Wire Supplier Is Best?

No single supplier wins for every residential project.

For a small DIY job, Home Depot and Lowe's are usually the easiest choices, since NM-B, UF-B, THHN, breakers, and boxes can be picked up locally. Menards offers a similar experience in Midwest where it operates.

For electrical contractors, Platt Electric Supply, City Electric Supply, and Graybar offer more extensive electrical catalogues and services tailored to complete project orders. Grainger fits property management and maintenance teams that buy wire along with other facility supplies.

When wire selection itself is the priority, Nassau National Cable has one of the broadest ranges. Its catalogue ranges from NM-B and UF-B through THHN/THWN-2, SER, SEU, URD, mobile home feeder, aluminium building wire, and low-voltage cable.

Manufacturer and supplier are two separate choices. Southwire, Cerrowire, and Prysmian | Encore Wire makes much of the wire sold by these suppliers. The right purchase comes down to the exact cable type and size, footage, conductor material, listing, price, and whether you need it today from a local store or from a deeper online inventory.

Sources

Market and housing data

• Research and Markets: Global Residential Building Wire and Cable Market

• TechSci Research: Residential Building Wire and Cable Market press release

• U.S. Census Bureau: New Residential Construction, September 2026

• Harvard JCHS: Remodeling Soars to New Heights (Improving America's Housing 2025)