Electrical Wiring and Supply

Circuits and service

The wiring you never see is the biggest electrical line in the house

Builders reported an average of $27,383 spent on electrical work excluding fixtures in a new single-family home, which is 6.4% of a $428,215 total construction cost¹. Lighting is counted separately at $5,392, or 1.3%¹. So roughly five dollars go into wire, boxes, circuits and the panel for every one that goes into the fittings you can see. That ratio is the single most useful thing to carry into a conversation about wiring.

Read the caveat before quoting the figure. That NAHB survey went to a sample of 4,000 builders and produced usable responses from 41 of them, and NAHB itself warns it is not a perfect tool for estimating costs for a particular house in a particular location¹. It is still the only builder-side breakdown that publishes its own methodology, and it describes a specific house: 2,647 finished square feet at about $162 per square foot¹.

Retrofit work is a different animal and the federal number for it is much smaller. Homeowners reported a median of $1,000 spent on electrical wiring and fuse boxes in the 2023 American Housing Survey². Half of those jobs came in under that. Against a $6,500 median across all improvement types, wiring work is usually a small job, not a large one².

Six kinds of wiring work, and what separates them

The permit office draws these lines too, and prices them differently.

Rough-in on new construction

Cable pulled and boxes set before the walls close. This is the $27,383 line in the NAHB breakdown, and it sits inside a major systems rough-in total of $82,319, or 19.2% of construction cost¹. Cheapest possible time to do any of it, because nothing has to be opened.

Adding a general purpose circuit

New receptacles and switches in a finished room. Rockville, Maryland calls this rough wiring outlets, meaning all switches and receptacles, and charges $65.25 for the first 1 to 20 outlets with $17.75 for each additional block of 20³. Permit offices count devices because that is what the inspector counts.

Dedicated appliance circuits

A range, a dryer, an HVAC unit or a shop tool that wants a circuit to itself. Rockville prices these per outlet rather than in blocks of 20: $65.25 for the first, $17.75 for each additional³. On the permit line a single dedicated circuit costs what twenty ordinary outlets cost.

Service and panel capacity

The feed from the meter through the main panel. Rockville tiers this by amperage: $65.25 up to 225 amps, $83.00 for 225 to 400, $100.50 for 400 to 1,000 and $130.25 above that³. The tiering tells you what the inspection effort scales with.

Old wiring in old houses

An older house changes this conversation more than any other fact about it. Whether a circuit can be extended, whether the existing wiring method is still serviceable, and whether the job becomes a rewire are questions answered by opening a box, not by phone.

New loads: EV charging and solar

These are priced as their own categories. Rockville charges $31.00 per outlet for residential EV charging and $120.00 for a residential solar installation, and excludes both from its standard minimum fee³. If your project includes one, do not assume it rides along on the general electrical permit.

Electrical rough-in, new single-family home$27,383 average, 6.4%

Homeowner median, wiring and fuse boxes$1,000

What does it cost?

There is no published installed price for rewiring a house, adding a circuit or upgrading a service. Not from the Bureau of Labor Statistics, not from the Census Bureau, not from NAHB, not from any state or city source we could reach. What exists is the two anchors above: an average $27,383 electrical rough-in inside new construction from a 41-response builder survey¹, and a $1,000 median for homeowner spending on wiring and fuse boxes from a federal housing survey². Those measure different things and neither is a quote.

The permit side is knowable and worth budgeting. Rockville counts devices and amps³, then adds a $142.00 residential filing fee and a 10.25% automation fee charged on all permit and application fees³. Wake County, North Carolina charges one flat $75 for electrical, mechanical and plumbing combined, and $75 plus $0.25 per square foot for alterations⁴. Broward County, Florida takes the greater of $125 or 1.85% of job value, valued from the RS Means manual or your own estimate, whichever is higher⁵. For scale, building permit fees averaged $7,640 per new home¹.

Construction figures come from NAHB's 2024 cost survey, which had 41 usable builder responses; the $1,000 median is Census Bureau and HUD 2023 American Housing Survey data; permit fees are from three adopted municipal schedules. None is an installed price.

Hiring

How to hire for wiring and service work

1

Who does the work

A licensed electrical contractor. This is the end of the category where the licensing exemptions stop applying: California's exemption requires both a contract price under $1,000 and work that does not require a building permit⁶, and adding circuits or touching a service will normally require a permit. Ask who holds the licence and who supervises the crew.

2

What pros will ask

The year the house was built. Your current service rating in amps. What is already on the circuit you want to extend. Whether the panel has physical space and whether the feeder can carry more. What new loads are coming: an EV charger, a heat pump, a range, a shop. Whether walls or ceilings can be opened, and who patches them.

3

What to check before signing

That the quote counts devices, since that is how the inspection is measured³. That permit and inspection responsibility is written down. That any service or panel work names the amperage. That patching is included or explicitly excluded. And ask what happens on a failed inspection, because re-inspection fees escalate: Wake County publishes $100, $200, $300 and $400⁴.

Wiring and service questions, answered straight

How do I know if I need a bigger service?

An electrician answers that with a load calculation on your actual house, not from a rule of thumb online. The one federal marker worth knowing is that the IRS used 200 amps as its threshold: electrical components supporting residential energy property qualified for the Energy Efficient Home Improvement Credit only if they met the National Electric Code and had a capacity of 200 amps or more⁷. That is a tax rule, not a code requirement, but it shows where the federal government drew the line on a modern panel.

What does it cost to rewire a house?

No authoritative source publishes that number, and we will not invent one. The closest verified figures point in opposite directions: new construction electrical rough-in averaged $27,383 in a 2,647 square foot house¹, while the federal median for homeowner spending on electrical wiring and fuse boxes was $1,000². A whole-house rewire sits somewhere above the second and is not the first, since retrofit work carries demolition and patching that a new build does not.

Do I need a permit just to add an outlet?

Usually yes, and exemption lists are narrow. Austin exempts reinstallation of attachment plug receptacles but explicitly not the outlets themselves, along with replacing branch circuit overcurrent devices of the required capacity in the same location⁸. Rockville's schedule has a line item for rough wiring outlets, which only makes sense because those outlets are permitted and inspected³. Austin also notes that exempt work still has to comply with the applicable codes⁸.

Is there still a tax credit for a panel upgrade?

Not for property placed in service after 31 December 2025. The Energy Efficient Home Improvement Credit covered panelboards, sub-panelboards, branch circuits and feeders at a limit of $600 per item, within an annual cap of $1,200, at 30% of qualified expenses⁷. The IRS states the credit applied to improvements made through 31 December 2025⁷. We searched for a replacement federal incentive and did not find one. Check current IRS guidance before you plan around it.

Why are quotes so different in different cities?

Two verified reasons. Labour: state mean annual wages for electricians run from $94,470 in Washington to $57,510 in Alabama, about 1.64 times on the same job title⁹. Permits: Rockville counts devices, Wake County charges a flat $75 and Broward takes 1.85% of job value³⁴⁵. Those are three incompatible pricing logics, which is why a national average electrical permit fee would be a manufactured number rather than a reported one.

Sources

Where these facts came from

Every figure on this page was read out of the page linked below. We do not cite cost aggregators.

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