Estimating electrical cost means building up from measured quantities to a bid price. The buildup is: materials + labor + equipment = direct cost, then + overhead = job cost, then + profit = bid price. Each layer has a range, not a fixed number, and your actuals depend on region, project size, scope complexity, and risk. Electrical is a quantity driven trade, so your estimate lives or dies on the takeoff.
What You Are Pricing
Electrical scope breaks into five buckets you measure separately: devices, rough in, panels and gear, feeders and home runs, and fixtures. Devices are receptacles, switches, data jacks, and plates. Rough in is the conduit, boxes, wire, and connectors behind the walls. Panels and gear are the panelboards, breakers, transformers, transfer switches, and main distribution. Feeders and home runs are the larger conduit and wire carrying current from the panel out to the branch circuits. Fixtures are the lighting, both the luminaires themselves and the support hardware. You also price permits, testing, and commissioning, which commonly run as a lump sum line.
Unit costs for electrical are built up from material price, labor hours times wage, equipment, waste, and markup. A receptacle is not just the device: it is the receptacle, the box, the cover plate, the wire whip, the connectors, the fasteners, and the labor to install and terminate it. Price each assembly as a built up unit, not as loose parts, or you will underprice the labor.
Direct Cost Buildup
Direct cost is what you spend on the job: materials plus labor plus equipment. Materials you pull from your supplier quote or your priced bill of materials. Labor you build from the takeoff count times the production rate times the wage. Equipment covers lifts, benders, knockouts, and testers, and on small jobs it is often buried in overhead rather than priced direct. Waste on wire and conduit is real: add 10% on wire, 5% on conduit, and a small percentage on devices for breakage.
Labor rate means burdened labor, not the wage you see on the check. A $35 per hour wage becomes $52 to $60 per hour billed once you add payroll taxes, workers comp, insurance, vacation, and tool allowance. Forgetting to burden the rate is the single most common way electrical estimates go broke.
Step by Step Cost Estimate
For a representative scope, a 5,000 SF office with 120 receptacles, 40 light fixtures, and 800 LF of conduit, walk through the buildup:
- Count devices: 120 receptacles at a built up unit cost of $45 to $65 each installed covers device, box, plate, whip, and labor. That is $5,400 to $7,800.
- Count fixtures: 40 LED troffers at $120 to $200 each installed, fixture plus hangers plus labor. That is $4,800 to $8,000.
- Measure conduit and wire: 800 LF of 3/4 inch EMT at $6 to $10 per LF installed, conduit plus wire plus fittings plus labor. That is $4,800 to $8,000.
- Price the panel: one 200 amp panelboard with breakers at $1,800 to $3,200 installed.
- Add permits and testing: $500 to $1,200 as a lump sum.
Adding the midpoints: materials and labor land near $11,500 to $14,000 in direct cost. Equipment on a job this size is a $300 to $600 lift rental folded in. Your direct cost lands in the $12,000 to $14,500 range before overhead and profit.
Factors That Move the Number
Voltage and service size drive panel and gear cost fast. A 400 amp service costs two to three times a 200 amp service in gear and labor. Conduit type matters: EMT is cheaper than rigid, and MC cable is faster than either but not allowed everywhere. Fixture type swings lighting cost dramatically, a $80 LED troffer and a $400 architectural linear are not the same line item. Access is a real driver: exposed work in an open ceiling is fast, work in a finished ceiling or a tight plenum is slow and labor can double. Code cycles and AFCI, GFCI, and surge requirements add devices and labor per cycle. Remodel work carries demolition, patch, and box extension labor that new construction does not.
Region moves the wage and the material price both. A licensed journeyman runs $35 to $45 per hour in low cost markets and $55 to $75 in high cost markets, and supplier pricing tracks the same spread. Permit fees vary by jurisdiction and can swing hundreds of dollars on a small job.
Common Mistakes
- Using markup instead of margin. They are not the same: 10% markup on $10,000 is $11,000, but 10% margin on $10,000 is $11,111. Know which one you are using.
- Forgetting to burden the labor rate before marking up. Burying payroll burden in overhead instead of the labor rate hides true cost.
- Pricing loose parts instead of built up assemblies. A receptacle without its box and plate loses 20% of the installed cost.
- Setting one profit number for every job regardless of risk. A clean office fit out and a contaminated industrial retrofit are not the same risk.
- Skipping the square foot or unit cost sanity check. If your price is $6 per SF on a basic office and the market runs $3 to $4, something is wrong.
- Missing home runs in the takeoff. The wire from the panel to the first device is often the longest run on the circuit and gets forgotten.
Putting It Together
Take your direct cost, add overhead, then add profit. Overhead covers the costs of doing business that are not on the job: insurance, office, vehicles, tools, mobilization, supervision, and accounting. A general range is 10 to 20% of direct cost, lower for large simple jobs, higher for small complex ones. Profit is what you keep after all costs. A general range is 5 to 15% of direct plus overhead, lower in competitive markets, higher for specialty or high risk work.
On the example, direct cost of $13,000 with 15% overhead adds $1,950 for a job cost of $14,950. Ten percent profit on job cost adds $1,495, landing the bid near $16,445. Run the same math with your actual overhead rate from your books and your target profit for the risk. Then check the bid against a unit cost sanity check: $16,445 over 5,000 SF is $3.29 per SF, which sits inside the normal range for a basic office electrical package. If your number lands outside that range, go back to the takeoff before you go back to the markup. The takeoff is where the money is, not the percentages.