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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchElectrical boxes are not just containers for wires. They are code-required enclosures that protect splices, hold switches and receptacles, support light fixtures or fans, provide a path for grounding and bonding when the wiring method requires it, and keep connections accessible for inspection and repair. The right box is chosen by the work phase, wiring method, box-fill calculation, device depth, support load, exposure, and local permit rules.
For a typical homeowner, the practical answer is this: use a new-work box before drywall, an old-work box in a finished wall, a deeper single-gang or multi-gang device box for modern receptacles and smart controls, a listed ceiling fan box for any fan location, a weatherproof assembly outdoors, and a junction box with a blank cover anywhere splices must remain accessible. On Bettesworth Construction job sites, we choose the box after the wiring plan is known, not before. A $3 shallow box can create a failed inspection, a crowded device, or an ugly extender fix after tile is installed.
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If you only need the short version, choose the electrical box this way:
- Splices only: Use an accessible junction box with a listed cover. Do not bury it behind drywall, cabinets, tile, plaster, or concrete.
- New framed wall: Use a new-work box fastened to a stud, joist, blocking, or bracket before drywall. Set the front edge for the finished wall thickness, usually 1/2 inch drywall, 5/8 inch Type X drywall, or more when tile and backer board are planned.
- Finished wall: Use an old-work or remodel box that clamps to the drywall, plaster, or paneling. Confirm wall depth before cutting.
- One switch or receptacle: Use a single-gang rectangular device box, preferably deep enough for the conductor count and device body.
- Two or more switches or receptacles: Use a multi-gang box sized for every conductor, device yoke, internal clamp, and ground.
- Light fixture: Use a round, octagon, or listed fixture box that matches the fixture weight and mounting style.
- Ceiling fan: Use a box and brace listed and marked for ceiling fan support. A regular light box is not an acceptable substitute.
- Commercial or conduit work: Use metal boxes, often 4-inch square boxes with raised covers or mud rings.
- Exterior or wet location: Use a weatherproof box, compatible connectors, gasketed cover, corrosion-resistant fasteners, and the right in-use cover for the device.
- Box recessed after tile or paneling: Use a listed box extender or extension ring where allowed, then recheck fill and cover fit.
Most basic boxes cost $2-$6 at retail. Installed prices are different. A professional outlet installation commonly falls around $100-$450 per outlet, while a junction box installation often lands around $100-$300 and can climb much higher when access, exterior work, new circuits, or finish repair are involved.
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How We Choose the Right Box on a Job Site
Good electrical box selection starts before anyone grabs a box from the truck. The shape matters, but the installation conditions matter more. The box that works cleanly in open framing can be wrong inside a finished plaster wall, and the box that holds a basic toggle switch can be too cramped for a GFCI, AFCI, USB receptacle, dimmer, or smart switch.
1. Installation phase
New-work boxes are installed before drywall. They fasten to framing or adjustable brackets, so they are stronger and faster in new construction. Old-work boxes are for finished walls and ceilings. They use ears, wings, clamps, or retrofit brackets to grip the finished surface. In remodel work, the wall cavity decides what is possible: 2×4 stud bays, 2×3 furred walls, masonry, plumbing stacks, fire blocking, and duct chases all change the box choice.
2. Wiring method
Plastic or PVC boxes are common in residential NM-B cable work because they are inexpensive, nonconductive, and fast to install. Metal boxes are preferred or required with EMT, rigid metal conduit, armored cable, MC cable, exposed work, many commercial rough-ins, and locations where bonding durability is part of the system. If a metal raceway enters the box, the box and cover are part of the grounding and bonding path. That is not a place to substitute plastic because it was nearby.
3. Capacity and device depth
Box capacity is measured in cubic inches and is usually stamped or molded into the box. A common shallow round pancake box may have only about 5.9 or 6 cubic inches. A 4-inch round ceiling fan/light box might have 15.3 cubic inches at 1-1/2 inches deep or 21.5 cubic inches at 2-1/8 inches deep. A 4-inch square metal box that is 1-1/2 inches deep is commonly about 21 cubic inches; deeper 2-1/8 inch versions are commonly about 30 cubic inches. Those numbers matter when several 12 AWG conductors and a bulky device share the same space.
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4. Load support
A box that encloses wires is not automatically a box that supports weight. A wall sconce, ceiling light, pendant, chandelier, and ceiling fan each impose different loads. Ceiling fan boxes must be listed and marked for fan support. Common fan-support markings include 35 lb fan support, and many brace kits are listed for fans up to 70 lb with higher fixture ratings, such as 90 lb or 150 lb depending on joist spacing and product listing.
5. Exposure and location
A box in a bedroom wall and a box on an exterior masonry wall are different assemblies. Outdoor work needs the box, cover, gasket, connector, raceway or cable method, fasteners, device rating, and GFCI protection to work together. Kitchens, bathrooms, garages, basements, laundry rooms, crawl spaces, exterior walls, and unfinished spaces often bring GFCI, AFCI, damp-location, wet-location, impact, or corrosion decisions into the box choice.
6. Access and inspection
Splices must remain accessible. A junction box above a dropped ceiling with a blank cover is normally accessible. A junction box hidden behind a tiled backsplash is not. If an inspector cannot access the splice without damaging the building finish, the box location should be changed before close-in.
The 12 Electrical Box Types
1. Junction boxes
A junction box is used to contain wire splices and branch-circuit transitions. You will see them in attics, basements, crawl spaces, mechanical rooms, above accessible ceilings, and sometimes behind blank covers in living spaces. The key rule is access. If wires are spliced, the box must have a cover and must remain reachable after the project is complete.
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Small indoor junction boxes may be plastic or metal. Larger boxes can be steel, cast aluminum, PVC, fiberglass, stainless steel, or gasketed industrial enclosures. Consumer cost guides in 2026 show junction-box parts ranging from about $10 to $450 depending on size, material, and weatherproof or industrial rating. The installed cost is usually labor-driven, with a common $100-$300 range for straightforward work and a much higher ceiling when the electrician must fish cable, open finishes, or work outside.
2. New-work boxes
New-work boxes are installed while framing is open. They may nail to a stud, screw to a joist, attach to a bracket, or slide on an adjustable bar. In production residential work, a basic 1-gang plastic new-work box may cost about $2-$5. Adjustable-depth boxes cost more, but they often save money where the finish thickness is not final at rough-in.
We use adjustable boxes or mock up the wall finish when a room will receive tile, shiplap, wainscot, cabinet panels, or 5/8 inch fire-rated drywall. A box set perfectly for 1/2 inch drywall can end up recessed by 3/8 inch after backer board and tile. That leaves the electrician adding extenders later, and it leaves the trim looking like an afterthought.
3. Old-work or remodel boxes
Old-work boxes are used after the wall or ceiling surface is finished. They clamp to drywall, plaster, or paneling through the cut opening. A plastic 1-gang old-work box is often about $2-$4 at retail, while metal remodel boxes are commonly about $2.50-$6 or more depending on depth and clamp style.
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Remodel boxes are useful, but they are not magic. They rely on the finished surface for support, so the surface needs to be sound. Crumbling plaster, thin paneling, oversize cutouts, water-damaged drywall, and textured masonry can all make the box loose. For heavy fixtures or fans, use a properly listed retrofit fixture or fan support assembly instead of trusting drywall wings.
4. Standard rectangular single-gang device boxes
The single-gang rectangular box is the familiar box behind one switch, one receptacle, one dimmer, one timer, or one low-voltage control when properly separated. A typical device box is roughly 2 inches wide by 3 inches tall, with depths varying from shallow to deep. The deeper version is usually the better choice when the wall allows it.
Modern devices are larger than old toggle switches. A GFCI receptacle, smart switch, USB receptacle, occupancy sensor, or thick dimmer can eat up the working room in a shallow box. For 12 AWG circuits, a box in the 18-22 cubic inch range is often a more serviceable choice than a cramped shallow box, especially where two cables enter the box.
5. Multi-gang boxes
Multi-gang boxes hold two, three, four, or more devices in one opening. They are common at kitchen counters, entry switch banks, bathroom vanities, media walls, offices, and commercial tenant improvements. The larger opening looks simple from the room side, but the box-fill math grows fast because each switch or receptacle yoke adds volume allowance.
For a 3-gang switch bank with multiple travelers, neutrals, grounds, and smart-switch pigtails, we prefer deeper boxes or a 4-inch square box with a multi-device mud ring where the wall system allows it. The added few dollars in box material is minor compared with the labor cost of fighting a packed switch bank for the life of the building.
6. Round pan or pancake boxes
A round pan box, often called a pancake box, is a very shallow round box used where framing leaves little room. Many are 4 inches round and only 1/2 inch deep, with roughly 5.9 or 6 cubic inches of capacity. Retail examples commonly run about $4-$6.
Pancake boxes are useful for light fixtures mounted directly over a joist or blocking, but they are easy to overfill. They are not the right answer for several cables, multiple splices, or bulky fixture leads. If the box is there only to support a lightweight fixture and contain one cable connection, it can be clean. If it becomes a wiring hub, choose a deeper box or a different route.
7. Round or octagon ceiling and wall fixture boxes
Round and octagon boxes are used for light fixtures, smoke alarms, carbon monoxide alarms, wall sconces, and similar devices. Common sizes include 4-inch round or octagon boxes at 1-1/2 inches deep or 2-1/8 inches deep. A nonmetallic ceiling fixture box might cost about $3-$7, while metal fixture boxes vary by depth, clamps, and bracket style.
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8. Ceiling fan-rated boxes and brace kits
A ceiling fan box is a separate category because a fan produces dynamic load. It moves, starts, stops, vibrates, and transfers that motion to the structure. A standard light box may hold a small fixture for years and still be unsafe for a fan.
Fan-rated boxes and brace kits are listed and marked for fan support. Common retail ranges in 2026 include about $11-$26 for many brace kits, with some basic fan-rated boxes around $8 and retrofit metal brace kits around $20-$26. Many adjustable braces span 16 inch to 24 inch joist spacing. Some products are marked for fans up to 70 lb and fixtures up to 90 lb or 150 lb depending on the assembly and spacing. The listing governs, not the appearance of the metal.
The 2026 NEC clarified fan-box language for ceiling-suspended paddle fan outlets. In practical terms, if the room layout makes a future fan likely, we discuss a fan-rated box during rough-in rather than leaving the homeowner with a light-only box in the middle of a bedroom.
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9. 4-inch square boxes with raised covers or mud rings
The 4-inch square metal box is a workhorse in commercial construction and a strong option in residential garages, basements, workshops, and utility spaces. It gives more volume than many single-gang boxes, accepts conduit cleanly, and can be converted with raised covers or mud rings for one device, two devices, blank covers, or specialty configurations.
A 4-inch square box that is 1-1/2 inches deep is commonly about 21 cubic inches. A 2-1/8 inch deep version is commonly about 30 cubic inches. That extra volume matters when conduit brings multiple conductors into the box. For exposed EMT, metal boxes also give a durable mounting point and a continuous bonding path when installed correctly.
10. Box covers and blank covers
A box cover is part of the box assembly, not a cosmetic accessory. Device covers protect installed switches and receptacles. Raised covers and mud rings adapt a square box to a finished wall. Blank covers close boxes that contain splices but no device.
Blank covers are often the difference between a legal accessible junction and a hidden hazard. If a splice is abandoned above a ceiling, in a closet, or inside a cabinet, it still needs a listed box and cover unless the wiring is removed or rerouted properly. Basic blank plates are inexpensive, often $1-$5, while weatherproof covers and in-use covers commonly run more.
11. Outdoor and weatherproof boxes
Outdoor boxes are built for exposure. Common 1-gang exterior boxes are about $8-$14 at retail, and 2-gang weatherproof boxes are often about $13-$19. Larger NEMA or IP-rated enclosures can cost far more, especially when they are hinged, gasketed, stainless, fiberglass, or intended for industrial equipment.
The box alone does not make the installation weather-safe. The whole assembly matters: box rating, cover style, gasket, threaded hubs or listed connectors, compatible cable or raceway, weep orientation where applicable, corrosion-resistant screws, WR-rated receptacles, GFCI protection where required, and an in-use cover for receptacles that stay plugged in while exposed to weather.
12. Box extenders and extension rings
Box extenders solve a common finish problem: the box is too far back from the finished surface after tile, paneling, cabinets, stone veneer, or a backsplash is installed. A listed extender brings the box opening forward so the device and cover plate sit correctly and the wall finish is not left exposed at the box edge.
Extenders are often inexpensive, commonly a few dollars per opening, but they should not be treated as a cure for every rough-in error. The extender must match the box and device, the screws must engage properly, and the box-fill calculation still has to work. Where a kitchen backsplash adds 3/8 inch to 1/2 inch of finish thickness, we prefer planning the box depth before tile rather than correcting every device after the fact.
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Plastic boxes are common in wood-framed residential construction using NM-B cable. They are lightweight, nonconductive, inexpensive, and fast to install. A basic plastic 1-gang new-work or old-work box at a major retailer is commonly about $2-$5 in 2026. Plastic also avoids the extra bonding step required by metal boxes, though the devices and equipment grounding conductors still have to be handled correctly.
Metal boxes make sense when the wiring method calls for them or the environment is tougher. We use metal with EMT, rigid conduit, flexible metal conduit, armored cable, MC cable, exposed garage and shop work, many commercial interiors, and places where durability matters. Metal boxes also handle heat, impact, and repeated service better than many plastic boxes. A basic metal 1-gang box is commonly about $2.50-$6, while 4-inch square boxes and covers vary by depth, knockouts, clamps, and pack size.
The practical rule is simple: match the box to the wiring method and the location. Do not install a plastic box in a metal conduit run just because it is cheaper. Do not use a metal box without a correct grounding and bonding method. In mixed systems, the connector, bushing, grounding screw, pigtail, device yoke, and cover all need to make sense as an assembly.
Box Fill: The Sizing Check That Prevents Trouble
Box fill is where many DIY electrical box choices fail. The National Electrical Code uses volume allowances for conductors, devices, clamps, fittings, and grounding conductors. The common allowances used in residential work are 14 AWG at 2.0 cubic inches per counted conductor, 12 AWG at 2.25 cubic inches, and 10 AWG at 2.5 cubic inches. Devices such as switches and receptacles generally count as two conductor volumes for each yoke based on the largest conductor connected to that device. All equipment grounding conductors together count as one conductor volume based on the largest grounding conductor in the box.
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Here is a plain example. A 20 amp receptacle circuit normally uses 12 AWG copper. If a single-gang receptacle box has two 12/2 cables entering it, you may have four insulated conductors that count: hot in, neutral in, hot out, and neutral out. That is 4 x 2.25, or 9.0 cubic inches. The grounds together add 2.25 cubic inches. The receptacle yoke adds 4.5 cubic inches. If the box has internal clamps, add another 2.25 cubic inches. The total is 18.0 cubic inches. A 14 cubic inch box is too small; a deep 20 or 22 cubic inch box is a better choice.
That example does not even include a GFCI body, USB charger, smart receptacle, dimmer heat considerations, or extra pigtails that make the physical space tighter. On our projects, deep boxes are cheap insurance. When we can fit a deeper listed box without weakening the wall assembly or crowding other trades, we use it.
| Common conductor size | Typical circuit use | NEC volume allowance per counted conductor | Practical box choice |
|---|---|---|---|
| 14 AWG copper | 15 amp lighting or receptacle circuits where allowed | 2.0 cu. in. | Accepts smaller boxes, but deep boxes still help with dimmers and smart switches |
| 12 AWG copper | 20 amp kitchen, bath, laundry, garage, and general receptacle circuits | 2.25 cu. in. | Use deep single-gang or 4-inch square boxes when multiple cables enter |
| 10 AWG copper | 30 amp loads such as certain appliances | 2.5 cu. in. | Plan larger boxes and wiring space; many DIY device boxes are too small |
2026 Electrical Box Costs
Electrical box material costs are usually modest. Labor, access, permits, new cable routing, troubleshooting, and finish repair drive the installed price. That is why replacing one box can feel expensive even when the box itself costs less than lunch. Electricians often bill $50-$130 per hour with a service-call minimum, and one-hour or two-hour minimums can dominate a small repair.
| Box or scope | Typical 2026 material cost | Typical installed cost context | What changes the price |
|---|---|---|---|
| Basic 1-gang plastic new-work or old-work box | $2-$5 | Often included in outlet or switch work | Open framing vs. finished wall, cable route, drywall repair |
| Basic metal 1-gang box | $2.50-$6 | Often used with conduit, armored cable, exposed work | Bonding, conduit fittings, surface mounting, commercial requirements |
| Round pancake box | $4-$6 | Used for shallow fixture locations | Limited fill, fixture weight, framing location |
| Nonmetallic ceiling fixture box | $3-$7 | Used for light fixtures where listed for the load | Joist position, bracket type, attic access |
| Ceiling fan brace or fan-rated box kit | $11-$26 for many retail kits | Can be much more when installed in a finished ceiling | Fan rating, joist spacing, attic access, ceiling repair |
| Weatherproof 1-gang exterior box | $8-$14 | Outdoor outlet work can range widely; remote underground outlets can exceed $1,000 | GFCI, in-use cover, trenching, conduit, siding or masonry penetration |
| Weatherproof 2-gang exterior box | $13-$19 | Usually part of a larger exterior device assembly | Cover type, number of devices, exposure, corrosion rating |
| Junction box | $10-$450 depending on size and rating | Common installation range is about $100-$300; difficult jobs can exceed $1,000 | Access, enclosure rating, wire routing, permit and inspection |
| Professional outlet installation using a box | Outlet and box materials often $5-$75 combined | Commonly $100-$450 per outlet; Homewyse starts around $297-$360 per outlet for a defined 2026 scenario | Existing circuit vs. new circuit, AFCI/GFCI, wall finish, distance from source |
The best cost move is batching small electrical tasks. If an electrician is already on site to add a GFCI in the garage, it is usually cheaper to handle the loose switch box, install a fan-rated bedroom box, and correct the recessed backsplash boxes in the same visit than to schedule four separate trips.
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Outdoor and Special-Room Decisions
Outdoor electrical boxes need to be specified as an assembly. For a simple exterior receptacle on siding, the scope may include a weatherproof box, WR-rated receptacle, GFCI protection, gasket, siding block or mounting base, listed connector, sealant where appropriate, corrosion-resistant fasteners, and an in-use cover. For masonry, conduit, or detached structures, the work can add drilling, anchors, threaded hubs, expansion fittings, trenching, burial-depth requirements, and inspection coordination.
Kitchens, bathrooms, garages, basements, laundry areas, crawl spaces, and exterior locations should be planned around the device and protection requirements, not the box alone. A kitchen counter receptacle may need room for a GFCI device or may be protected upstream. A laundry receptacle may involve a 20 amp circuit and 12 AWG conductors. A garage wall may call for a durable surface-mounted metal box and conduit instead of a plastic old-work box.
Commercial and multifamily projects add another layer. Fire-rated wall assemblies, acoustical sealant, putty pads, metal studs, MC cable, EMT, hospital-grade devices, low-voltage separation, and inspection documentation can all affect box selection. Before close-in, we document ratings that matter: UL or other listing, cubic-inch capacity, fan support marking, fire rating where relevant, and compatibility with the cover or mud ring.
When to DIY and When to Hire a Pro
A homeowner with good basic skills may be able to replace a cover plate, add a listed box extender to correct a slightly recessed box, or replace a damaged old-work box in the same location where local rules allow it. Even then, the circuit should be turned off, verified dead with a tester, and handled without guessing. If the work involves aluminum wiring, cloth wiring, knob-and-tube wiring, scorch marks, buzzing, moisture, loose grounding, or an unknown circuit, stop and call a licensed electrician.
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Permit rules are local. The NEC is a model code published by NFPA, but it becomes enforceable through state and local adoption, often with amendments. Some jurisdictions require permits for adding or replacing receptacles and lights. For example, Portland’s residential electrical guidance states that permits are needed to add new receptacles and lights and to replace lights and plugs. Washington L&I states that electrical work generally requires a permit and inspection, with limited exceptions. Your authority having jurisdiction, usually called the AHJ, has the final word.
Common Mistakes We See in Remodels
The most common mistake is choosing the box before counting the conductors. A shallow old-work box may fit the hole, but it may not legally fit two 12/2 cables, grounds, internal clamps, and a receptacle. That problem gets worse with GFCI, AFCI, USB, and smart devices.
The second mistake is ignoring finish thickness. Drywall is often 1/2 inch, garages and rated assemblies may use 5/8 inch, and tile assemblies can add 1/4 inch to more than 1/2 inch beyond the drywall face. If the box is recessed too far, the device may not sit flush, the cover may bow, and combustible material may be exposed at the opening. Extenders help, but proper rough-in is cleaner.
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The third mistake is treating a light box as a fan box. A fan-rated brace costs a small amount compared with opening a finished ceiling later. If a bedroom, living room, covered porch, or office is likely to receive a fan someday, we prefer solving that during rough-in.
The fourth mistake is mixing low-voltage and line-voltage wiring casually. Doorbell, thermostat, network, speaker, security, and data cabling do not belong loose in the same box with 120 volt conductors unless the assembly and separation method are listed for that use. Use the correct low-voltage ring, divider, or combination box.
The fifth mistake is burying junction boxes. We find this behind cabinets, under old plaster patches, above finished basement ceilings, and behind exterior trim. If there is a splice, someone must be able to reach it later without demolishing the building finish.
Electrical Box Selection Checklist
- What is the box doing? Splice, switch, receptacle, light fixture, fan, pull point, blank access, or exterior device?
- Is the wall open or finished? Use new-work boxes before drywall and old-work boxes only when the finished surface can support them.
- What wiring method is entering? NM-B, MC, armored cable, EMT, rigid conduit, PVC conduit, or low-voltage cable?
- Plastic or metal? Match the box to the wiring method, grounding requirements, durability needs, and local practice.
- How many conductors count? Include pass-through and terminated conductors, device yokes, internal clamps, fixture fittings, and all grounds as required by box-fill rules.
- What is the device depth? Plan extra room for GFCI, AFCI, dimmers, timers, USB devices, smart switches, and pigtails.
- Does the box support weight? Check fixture rating and fan-support marking. Do not hang a fan from a regular light box.
- Is it wet, damp, corrosive, or exposed? Specify the box, cover, gasket, fittings, fasteners, and device protection together.
- Will the box remain accessible? Splices need a reachable cover after all finishes are installed.
- Does the work require a permit? Check the local AHJ before opening walls or adding circuits.
Code Notes and Sources
For code context, NFPA publishes NFPA 70, the National Electrical Code, and NFPA’s 2026 NEC update summarizes current code-cycle changes. NEC adoption varies by jurisdiction, so ESFI’s NEC adoption map is useful for confirming which edition may apply before a project starts. The 2026 fan-box discussion is also reflected in NEC 314.27(B) fan outlet commentary.
For box-fill reference, NEC Article 314 is the central article for boxes and conduit bodies, and the commonly used conductor volume allowances include 14 AWG at 2.0 cubic inches, 12 AWG at 2.25 cubic inches, and 10 AWG at 2.5 cubic inches. For 2026 pricing context, current cost guides from HomeGuide, Angi, and Homewyse, plus major retailer listings such as The Home Depot’s electrical box guide and fan-rated box listings, support the material and installed cost ranges used here. Permit examples referenced above come from Portland residential electrical permit guidance and Washington L&I electrical permit basics.
The bottom line is straightforward: do not choose an electrical box by shape alone. Choose it by function, wiring method, cubic-inch capacity, support rating, exposure, accessibility, and inspection requirements. The deeper, correctly rated box that fits the assembly is usually the professional choice, and it is almost always cheaper than correcting a cramped or noncompliant installation after the walls are closed.
Frequently Asked Questions
What electrical box should I use for a ceiling fan?
Use a box and brace kit that is listed and marked for ceiling fan support. A standard round or octagon light-fixture box is not automatically fan-rated, even if it looks strong.
Can a junction box be hidden behind drywall?
No. A junction box that contains splices must remain accessible after the work is complete. Use a listed cover or locate the box where it can be reached without damaging permanent finishes.
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Plastic boxes are common with NM-B cable in residential wood framing, but they are not right for every job. Metal conduit, armored cable, exposed commercial work, and some durability or bonding conditions call for metal boxes.
How much does it cost to install an electrical box in 2026?
Basic box materials often cost $2-$6, while weatherproof boxes and fan brace kits cost more. Installed work is labor-driven: junction boxes commonly run about $100-$300 installed, and outlet installations commonly run about $100-$450 per outlet depending on access and wiring.
How do I know if an electrical box is big enough?
Check the cubic-inch capacity marked on the box and perform a box-fill calculation. Common NEC allowances are 2.0 cubic inches for each counted 14 AWG conductor, 2.25 for 12 AWG, and 2.5 for 10 AWG, plus required allowances for devices, clamps, and grounds.
Do I need a permit to replace or add an electrical box?
Permit rules depend on your local AHJ. Many jurisdictions require permits for new circuits, added receptacles, relocated boxes, exterior work, and sometimes replacement of plugs or lights. Check locally before opening walls or altering wiring.
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