Estimating a commercial electrical job from scratch takes five steps: review the project documents, perform the takeoff, build your cost catalog, calculate labor using production rates, and assemble the final bid. Each step builds on the last. Skip one or rush through it and the estimate either loses the job or loses money on it.
This guide walks through each step the way an experienced electrical estimator actually does it — including the parts most guides leave out, like how to read a panel schedule, how production rates work, and why not tracking historical data is the single most expensive habit in the industry.
Step 1: Review the Project Documents
Before touching any numbers, an electrical estimator needs a complete picture of what is being installed. Every commercial electrical project comes with two core documents: a set of drawings and a specification document.
Experienced estimators start with the drawings. The drawings give a visual understanding of the site — the floor plan, the panel locations, the device layouts, the conduit routing. Reading the drawings first makes the specification document easier to process because the estimator can visualize what they are reading.
More experienced estimators — typically those with 15 or more years in the trade — can work from the spec document alone. They have enough pattern recognition to visualize the scope without needing the drawings as a reference first. For estimators earlier in their career, drawings first is the right approach.
The goal of this step is to understand the full scope before a single number gets written down. Estimators who skip this step and jump straight to counting end up pricing the wrong scope.
Step 2: Identify Major Items From the Panel Schedule
After reviewing the documents, the next step is identifying the large-ticket items. For commercial electrical work, that starts with the panel schedule.
The panel schedule shows every electrical panel on the project — how many panels there are, which ones are new installations versus existing, the amperage of each panel, and the circuits being fed. This information drives a significant portion of the estimate because panels, switchgear, and service equipment are among the highest-cost items on any commercial electrical job.
Pipe sizing comes next. Conduit size is determined by the wire being pulled through it, and wire size is determined by the load being served. An estimator who knows the panel amperage and the circuit loads can work out the conduit and wire sizes before performing the full takeoff. This gives a framework for the detailed counting that follows.
Identifying major items first — panels, service equipment, large conduit runs — prevents the common mistake of getting deep into device counts before realizing a major scope item was missed entirely.
Step 3: Perform the Takeoff
The takeoff is the process of counting and measuring everything that needs to be installed. For commercial electrical work, that includes every device, every fixture, every panel, every length of conduit, and every foot of wire on the drawings.
Conduit and wire are measured by distance. An estimator scales the drawings and measures the run lengths — from the panel to the first junction box, branch to branch, device to device. These measurements determine how much material is needed and directly feed the labor calculation in the next step.
Devices — duplex receptacles, switches, light fixtures, disconnects — are counted per page. A commercial job with multiple pages of drawings means counting every device on every page and totaling across the full set. Manual counting is the slowest and most error-prone part of the takeoff. Miscounts are common, especially on dense drawing pages with many similar symbols close together.
Orys AI's template matching eliminates manual device counting. An estimator highlights one symbol on the drawing — a duplex receptacle, for example — and Orys AI's template matching finds every matching symbol across that drawing page automatically. The process takes seconds. On a La Madeleine restaurant buildout, a contractor using Orys AI's template matching eliminated an hour of manual recount that had previously cost him the same time every time the drawing was revised.
Vendor quotes are requested during or after the takeoff. The estimator knows what materials are needed from the takeoff and can send a request to their electrical supplier — Lone Star Electrical Supply in Houston, for example — for current pricing on conduit, wire, panels, and devices. Vendor quotes are notoriously slow to arrive and are one of the biggest sources of delay in the estimating process.
Step 4: Build the Cost Catalog and Apply Pricing
Once the takeoff quantities are known and vendor quotes have arrived, the estimator prices each line item. This is where a cost catalog becomes critical.
A cost catalog is a structured database of every material an electrical contractor installs, with current pricing from their suppliers. Without a catalog, estimators price from memory, online lookups, or outdated spreadsheets — all of which introduce errors and slow the process down significantly.
The most common failure point in the cost catalog step is manually inputting vendor quote line items into a spreadsheet. A vendor quote for a commercial electrical job can contain 100 or more line items. Manually transferring each one takes hours and introduces transcription errors. Missed line items — materials that appear on the quote but get skipped during manual entry — are one of the leading causes of underbids.
Orys AI's catalog eliminates manual vendor quote entry. An estimator uploads the vendor quote PDF and Orys AI's catalog extracts every line item, organizes the pricing, and proposes the updates. The estimator reviews and approves before anything changes. When a supplier updates their pricing mid-project, the estimator updates the item once in Orys AI's catalog and the change flows through to every active estimate that references that material in real time.
On a spreadsheet, a mid-project price change means manually finding and updating every affected cell across every estimate that item appears in. On Orys AI, it is a single update.
Step 5: Calculate Labor Using Production Rates
Material cost is only half the estimate. Labor is the other half — and for commercial electrical work, labor is calculated using production rates.
A production rate is the number of units a journeyman electrician can install in one hour. For example, a duplex receptacle has a production rate of approximately 1.2 units per hour — meaning a journeyman installs roughly one duplex every 50 minutes under normal commercial conditions. That rate is applied to the total count from the takeoff to calculate the total labor hours for that item.
Every item in the scope has its own production rate. Conduit runs, wire pulls, panel terminations, fixture installations — each one has an industry-standard rate that experienced estimators adjust based on job conditions like ceiling height, existing structure interference, and site access.
Total labor hours across all items, multiplied by the journeyman labor rate, gives the total labor cost. Overhead and insurance are then added as a percentage of the total. A typical commercial electrical contractor applies overhead and insurance in the range of 15 to 25 percent depending on company size and structure. Profit margin is applied on top — commonly around 20 percent, though this varies by market and relationship with the general contractor.
The estimators who consistently protect margin are the ones who track their own production rates from completed jobs. Industry-standard rates are a starting point. A contractor's actual rates — based on their crew, their market, and their typical project type — are what protect profit on every subsequent bid. Not tracking historical production data is the single most expensive habit in commercial electrical estimating.
Step 6: Assemble and Deliver the Final Bid
The final bid is a formal document that presents the total cost broken down by scope. Commercial electrical bids are typically organized using a Work Breakdown Structure (WBS) — a hierarchical breakdown of the scope by system, location, or phase.
How the bid is delivered varies by client and relationship. Some general contractors expect a detailed Excel export with every line item visible. Others accept a summary document with totals by WBS category. Long-term relationships with a GC often come with an understood format — new relationships usually default to the most detailed breakdown available.
Orys AI's reporting exports the completed estimate directly to Excel, organized by WBS automatically. Every material, labor hour, and cost category is broken out without the estimator having to build the export format manually.
The Most Common Mistakes in Commercial Electrical Estimating
Not tracking historical data
Estimators who do not record production rates and actual costs from completed jobs are forced to guess on every new bid. Guessing high loses jobs to competitors with better data. Guessing low loses money on the job. Historical data is the only thing that lets an estimator bid tight and still protect margin.
Missing line items on vendor quotes
Manually transferring vendor quote line items into a spreadsheet introduces transcription errors. A 100-item quote transferred by hand almost always has missed or incorrectly entered items. Each missed item is a cost the contractor absorbs on the job.
Too many bids, not enough time
Estimators managing high bid volumes manually run out of time before they run out of opportunities. When an estimate takes two full days, the team can only pursue a limited number of jobs per week. Speed without accuracy is not the goal — but a faster process means more bids submitted, which means more wins at the same win rate.
Stale pricing in the catalog
Material prices change. A contractor still pricing copper wire at last quarter's rate is either overbidding on jobs where prices dropped or underbidding on jobs where prices rose. Keeping the cost catalog current is not optional — it is the foundation of every accurate estimate.
What faster estimating looks like in practice
A commercial electrical contractor used Orys AI to estimate a $2M military base project in 5 hours. The same scope previously took 2 full days on spreadsheets. That time difference — 5 hours vs 2 days — is the difference between bidding one job per week and bidding three.
Frequently Asked Questions
How long does it take to estimate a commercial electrical job?
A commercial electrical estimate typically takes one to three days depending on the scope size and complexity. A small restaurant or retail buildout might take half a day for an experienced estimator with a current cost catalog. A multi-story commercial building or government facility can take two to three full days. Contractors using AI-assisted estimating tools like Orys AI have reduced estimate time on large scopes from two days to five hours.
What is a production rate in electrical estimating?
A production rate is the number of units a journeyman electrician can install per hour under normal commercial conditions. For example, a duplex receptacle has a production rate of approximately 1.2 units per hour. Production rates are applied to takeoff quantities to calculate total labor hours, which are then multiplied by the journeyman labor rate to produce the labor cost portion of the estimate.
What is a panel schedule and why does it matter for estimating?
A panel schedule is a document included in the electrical drawings that lists every electrical panel on a project, including the number of circuits, the amperage, and whether the panel is a new installation or existing. Electrical estimators review the panel schedule early in the estimating process because panels and service equipment are among the highest-cost items on any commercial electrical job, and their specifications determine conduit sizes and wire sizes throughout the project.
How do electrical contractors calculate profit margin on a bid?
Most commercial electrical contractors apply overhead and insurance as a percentage of total cost — typically between 15 and 25 percent — and then apply a profit margin on top. A common profit margin for commercial electrical work is around 20 percent, though this varies by market, job type, and the contractor's relationship with the general contractor. Contractors with accurate historical data can bid tighter margins with confidence because they know their actual costs.
What is the difference between a takeoff and an estimate?
A takeoff is the process of counting and measuring all materials from the project drawings — every device, fixture, conduit run, and length of wire. An estimate is the complete cost document that includes the takeoff quantities priced against the cost catalog, labor hours calculated from production rates, overhead, and profit margin. The takeoff is an input to the estimate, not the estimate itself.
What software do commercial electrical contractors use for estimating?
Many commercial electrical contractors still use Excel spreadsheets, though spreadsheets require manual updates for every price change and do not scale well as job volume increases. Dedicated estimating platforms include Accubid, McCormick, STACK, and Orys AI. Orys AI is built specifically for commercial electrical contractors and includes an AI-assisted cost catalog, template matching for automatic symbol detection, and real-time cost updates when catalog pricing changes.
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