Job Costing for Electrical Contractors

Why Blended Numbers Hide the Truth

A general ledger that tracks 'Materials' and 'Labor' as single categories blends a $400 service call with a $180,000 commercial build-out. The blended margin might look fine while the small jobs are carrying the big ones, or the reverse. Job costing separates every dollar by the job it belongs to, so the profitability of each type of work stands on its own.

This matters most at bid time. If you don't know that your last three tenant build-outs ran 8% under the margin you assumed, you'll keep bidding that work the same way — and keep losing money on a category you might otherwise avoid or reprice.

What Gets Tracked, Per Job

Material costs are tracked at actual vendor cost, not list price, and tied to the job at time of purchase — not batched and allocated later. Labor is split between billable field hours and non-billable time (shop, drive time, training), with the correct burden rate applied per hour: payroll taxes, workers' comp, and benefits, not just the wage. Subcontractor and equipment rental costs are tied to the job the same way.

Change orders get logged against the job as they happen, with their own cost and revenue lines, so the final profitability number reflects what was actually built — including scope that got added mid-project — not just the original signed contract.

Service Work vs. Project Work

Electrical contracting usually runs two different businesses under one roof: dispatched service work billed hourly or flat-rate, and larger project work billed by contract or T&M. Job costing keeps these separate so a strong quarter in one doesn't mask a weak quarter in the other. It also surfaces which service call types are worth the truck roll and which project types are worth pursuing more of — and which aren't.

The Reports You Actually Get

Every month, your job profitability report ranks jobs by margin with the full cost breakdown behind each number. For active jobs, a work-in-progress schedule tracks billed-versus-earned so over- or under-billing shows up before it becomes a cash flow problem. Estimated-versus-actual comparisons on completed jobs show you where bids were accurate and where they weren't, so the next bid gets closer.

Estimated vs. Actual: Closing the Loop on Bidding

Job costing is only half the value if it stops at 'here's what this job cost.' The other half is comparing that actual cost against what you estimated when you bid it — by labor hours, by material, by the job as a whole. Consistently running over on labor for a certain job type, or under-pricing material handling on jobs that require a lot of small-parts runs, is invisible until estimated and actual sit side by side.

We build that comparison into your monthly reporting on completed jobs, so the feedback loop between bidding and actual performance closes every month instead of once a year, if ever. Over a handful of jobs, this is usually the fastest way an electrical contractor's bidding accuracy improves.

Common Job Costing Mistakes We Fix

The most common problem we find is material purchased for a job but recorded to a general supplies account instead of tagged to the job — usually because it was bought on a company card at a supply house without a job reference. We set up a simple purchasing workflow (job number on the receipt, tagged in QuickBooks at entry) that closes this gap going forward, and we go back and reclassify what we can from existing records.

The second most common issue is labor burden left out of job costing entirely — only the base wage gets allocated to the job, while payroll taxes, workers' comp, and benefits sit in overhead. That understates true job cost and overstates margin, sometimes significantly on labor-heavy jobs. We build the full burden rate into job costing from the start so the margin you see is the real one.

Overhead Allocation Without Distortion

Not every cost belongs on a job — rent, office staff, insurance, and general shop overhead are real costs of running the business, but allocating them job-by-job usually creates more noise than insight, since the allocation method itself becomes a judgment call that can be argued either way. We keep true overhead separate and instead track it as a percentage of revenue company-wide, so job profitability reports show clean gross margin per job, and overhead recovery is tracked on its own as a company-level KPI rather than smeared arbitrarily across individual jobs.

This keeps the job-level numbers honest and comparable to each other, while still giving you visibility into whether overall overhead is growing faster than revenue — which is a different question with a different answer.