How to Estimate Electrical Jobs: Panel, Counts, and Access

Short answer: How to estimate electrical jobs means counting rather than measuring area. The units are devices installed and circuits run, plus service amperage on larger work. Open the panel first and record the main breaker size, free spaces, and branch wiring type. Then count receptacles, switches, and fixtures room by room, and walk each home run with a wheel. Access decides the labor: the same outlet costs several times more in a finished wall than in open framing.

Floor area tells an electrician nothing useful. A 900 square foot condo rewire and a 900 square foot addition rough-in are separate jobs that happen to share a number, and what separates them is how hard it is to get a cable from the panel to the box. That means the electrical walkthrough is an inventory exercise with one physical judgment layered on top, and the order you do it in matters — the panel first, because what you find there can end the conversation about everything else.

What do I read off the panel before anything else?

Open the dead front, take a photograph, and write down eleven things. This takes four minutes and it decides whether the customer’s wish list is even possible.

What you record	Why it changes the estimate
Main breaker amperage	100, 150, 200, or 400 amp service sets the ceiling on everything being added
Bus rating versus main size	They are not always the same, and the smaller one governs
Total spaces and free spaces	No open double-pole space means a sub-panel or a service change before anything else
Tandem breakers allowed or already stuffed	Some panels accept them in listed positions only
Panel manufacturer and vintage	Certain obsolete panels have no current replacement breakers and draw insurer attention
Double-tapped or shared neutrals	Corrections that have to happen before new work is added
AFCI and GFCI protection present	New and extended circuits usually trigger requirements the old panel does not meet
Branch conductor material	Aluminum branch wiring from the mid-1960s to mid-1970s changes every device termination
Knob-and-tube visible anywhere	A scope change, not a detail
Grounding electrode system and bonding	Rods, water bond, gas bond, jumper sizes
Directory legibility	Circuit tracing time you are about to spend for free unless it is on the estimate

Anything the customer wants to add — an EV charger, a heat pump, a range, a hot tub, a shop sub-panel — has to survive a dwelling load calculation against that service before it becomes a price. Do the calculation, and if the service will not carry the load, the estimate needs a service upgrade line or a load management device rather than optimism.

How do I count devices without walking the house twice?

One lap, one room at a time, into a worksheet with fixed columns. Anything that is a count belongs in the schedule; anything that is a guess belongs in the conditions with a rate attached.

Room	Receptacles	Switches / dimmers	Fixtures	Fans	Alarms	Access route
Kitchen	6 GFCI	4	5 cans	—	—	Attic above
Living	4	3 dim	2	1	1	Basement below
Primary bed	3	2	1	1	1	Neither — interior wall
Hall and stairs	1	3-way pair	2	—	2	Attic above
Garage	2 GFCI	1	3 strips	—	—	Open framing
Total	16	13	13	2	4

That last column is the one that turns a count into a price, and it has to be filled in while you are standing in the room. Write each device line so a second electrician could price against it: “One 20-amp circuit, 12/2 copper, 46 feet, panel to kitchen counter GFCI, fished from the attic” is a line. “Add kitchen circuit” is a wish.

Circuits get counted separately from devices, and each one gets a measured length rather than an estimate. Walk the actual route with a measuring wheel or a laser — through the joist bay, up the chase, along the top plate — and add the drops. Gauge follows amperage in the ordinary way, 14 AWG at 15 amps, 12 at 20, 10 at 30, 8 at 40, and the conductor material gets named because service feeders are frequently aluminum while branch work is not.

Why does the path cost more than the outlet?

Because the box, the device, the plate, and the cable cost the same in every house, and the labor does not. In open framing you drill, staple, nail on a box, and walk away. In a finished wall you locate a path, cut, fish past insulation and blocking, land an old-work box, then patch and vacuum.

Five route conditions, roughly in order of what they do to your hours:

1. Open framing. Rough-in speed, no restoration at all.
2. Unfinished basement below or a walkable attic above. Drill from the open side, one small opening.
3. Finished wall with access above or below. Fish, cut one or two openings, patch.
4. Finished wall with neither. Multiple openings, possibly surface raceway, real restoration.
5. Plaster and lath, or masonry backing. Slow cutting, fragile edges, and the biggest patch bill.

Do not adopt anyone’s published multiplier for these. Time yourself on three of each and build your own, because that spread is exactly where a competitor’s low bid hides its future change order. Then name the route condition inside each device line so the customer can see why six outlets in the finished living room do not cost what four in the open garage cost.

What has to be photographed on an electrical walkthrough?

The panel with the dead front off and the directory visible, the meter and service entrance from outside, the point where the service enters the building, the grounding electrode connections, a representative open box showing conductor material and box fill, the ceiling or floor above and below each planned run, the attic or crawl access you will be working from, any existing damage to finished surfaces, and every location the customer points at while talking. Number them and cite the numbers in the line descriptions. The panel photograph alone answers half the questions that would otherwise come back by text a week later.

Which questions change the number most?

Eight, and none of them are about the wiring.

• Has the panel or service ever been upgraded, and do you have the permit paperwork?
• Has anything in the house been renovated, and by whom?
• Is anything currently not working, or tripping, or warm to the touch?
• Are any circuits shared with a garage, a shed, or a well?
• Is the ceiling below the work finished, and is there anything above it you care about?
• Who is patching and painting when we are done?
• Is the house occupied during the work, and can we take power down for part of a day?
• Are you adding an EV, a heat pump, or a shop tool in the next couple of years?

The last one is worth asking on every job. Sizing a service change for the load the customer will have in three years costs almost nothing extra now and prevents a second mobilization. On chargers, note that the federal alternative fuel vehicle refueling property credit customers may have heard about does not apply to property placed in service after June 30, 2026, according to the IRS credit page. Answer that by pointing at their tax preparer, and never let a credit be part of your price.

How do the counts become a price?

Four layers, all built from your own numbers.

Material. Devices, boxes, plates, cable by the measured foot at the right gauge, breakers, panel and gear, conduit and fittings, rods and bonding jumpers, straps, connectors, and firestop. Order cable in whole reels or whole boxes and price what you buy.

Labor. Hours per device, per circuit, and per gear installation, taken from your own timed jobs and adjusted by the route condition you recorded in the worksheet. On a service change, add the hours nobody bills for: circuit tracing, labeling the new directory, and the coordination call with the utility.

Pass-throughs and restoration. Permit and plan review, and the inspection trips — electrical work is permitted and inspected nearly everywhere, and new circuits or a service change normally means both a rough and a final. Somebody has to be on site for each. Utility coordination for a meter pull and reset is a separate day you do not control. Patching goes on as its own line, priced per opening, with the finish state named — most electricians stop at patched, sanded, and primed, and texture matching and paint are excluded in writing.

Overhead and margin. Add overhead as a percentage from last year’s books. Then set margin correctly, since markup and margin are not the same thing and treating them as one is the most common pricing error in the trade: $4,000 of cost with 35 percent added on top prices at $5,400, which is a 25.9 percent margin. A true 35 percent margin is $4,000 divided by 0.65, or $6,154. Any per-outlet or per-panel range you find published is a sanity check only, moving hard with local wage rates, permit costs, copper pricing, and how old the housing stock is. Your own cost is the number that decides.

What gets missed on electrical estimates?

The same items, on job after job, and every one of them is work performed for free when it is not written down.

Commonly missed	What it actually is
Circuit tracing and labeling	Hours on an unlabeled 1968 panel before you install anything
Inspection attendance	Two separate trips, sometimes with a window rather than a time
Old-work box fill corrections	The existing box will not legally accept another conductor
Smoke and CO alarm requirements triggered by the permit	Interconnected alarms in bedrooms and halls, on your ticket
Blocked fish paths	Firestops, insulation, and chases that dead-end mid-wall
Patching, and who paints	Restoration ends at primed unless you said otherwise
The outage window	Power down for part of a day is a customer conversation, not an assumption
Temporary lighting and power	The house still has to function while you work
Trip charges on a return visit	Warranty, punch, and the fixture that arrived damaged

Anything you cannot resolve on site goes into a conditional block with a stated hourly rate and separate initials — aluminum branch wiring found at the first box, an undersized feeder, buried junction boxes, or a utility lateral that is not your equipment and not your schedule. When you are the sub on somebody else’s job, price the circuit from the equipment nameplate rather than a phone call; the mechanical contractor’s own document should already name the breaker size, as described in how to estimate HVAC jobs.

What do I keep once the inspection passes?

The signed estimate with the conditions initialed, the permit and both inspection cards, the load calculation, the panel directory photograph, supply house invoices, and dated pictures of everything that got covered. On a rewire, photographs of open walls are worth more in five years than any note you could have written.

Keel keeps that record on the phone and only there — an iOS app running entirely on device, with no account, no bank connection, no cloud, no login, and an App Store privacy label reading Data Not Collected. It does not do the takeoff; that stays in whatever you count with today. What it handles is the money that follows. When the final inspection passes you raise the invoice on the tailgate with your own numbering, your logo, your brand color, and a payment link the customer scans as a QR code before you pull out of the drive. Permit fees, supply house tickets, and the reel of 12/2 that came off the van get photographed and read on device by Apple Intelligence, so the pass-through lines you promised to document actually are — the sorting habit behind that is in the contractor receipt organizer. Every run to a walkthrough you did not win is still a deductible business trip when the record exists, which is the point of tracking mileage for taxes. The ledger is append-only and hash-chained, and the year exports as one file or as an Accountant Pack of CSV plus a one-page summary PDF. Free is $0 with unlimited invoices, receipts, and mileage; Keel Pro is a one-time $249.99 Lifetime purchase rather than a subscription.

Frequently asked questions

How do electricians estimate a job?

By counting rather than measuring area. Devices installed and circuits run are the units, with service amperage added on larger work. The walkthrough starts at the panel — main breaker size, free spaces, branch conductor material — then goes room by room recording receptacles, switches, fixtures, fans, and alarms, with the access route noted for each. Circuit lengths get walked with a wheel.

Why does adding one outlet cost so much in a finished house?

The materials are identical either way; the labor is not. In open framing you drill, staple, and mount a box in minutes. In a finished wall you have to find a path, cut openings, fish past insulation and blocking, land an old-work box, then patch and clean up. That is several times the on-site time plus restoration the rough-in version never required.

Do electrical jobs always need a permit?

Nearly always, and that is a feature of your estimate rather than an inconvenience. New circuits and any service change typically require both a rough and a final inspection, which is two separate trips for somebody on your crew. Put the permit fee on its own line at cost, say who pulls it, and state how many inspection trips are included in the price.

How do I price a service upgrade from 100 to 200 amps?

Start with a dwelling load calculation showing the upgrade is warranted, then build the line from parts: panel and breakers, meter can, riser and weatherhead or lateral work, service entrance conductors, grounding electrodes and bonding, transferring and labeling every existing circuit, plus the utility coordination and the outage window. Add permit, inspection trips, patching, overhead, and margin.

Should electricians charge for an estimate visit?

For straightforward residential work, most do not, because the visit is how the job is won. Charging becomes reasonable when the visit is really diagnostic work — tracing an intermittent fault, opening devices, or producing a load calculation for another contractor. If you do charge, say the amount before you drive out and credit it against the job if the customer books.

What size circuit does a home EV charger need?

It depends on the unit’s rated draw, and continuous loads are sized above their actual draw, so a charger pulling 32 amps commonly lands on a 40-amp circuit and a 48-amp unit on a 60-amp one. The real question is whether the existing service can carry it at all, which the dwelling load calculation answers before you price any wire.

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This article is general information, not professional or tax advice.