The Best Electrical Estimating Workflow for Commercial Contractors (2026)

A commercial electrical tender lands as a pile: lighting and power layouts, a legend sheet, switchboard schedules, specs, an addendum or two. First you work out which revision is current. Then hours counting fittings, measuring runs, typing it into Excel and working out labour line by line.

Miss one fitting and it comes out of your margin. Guess the labour and it costs you the job, or the profit on it.

What does the best electrical estimating workflow look like?

• The pack is sorted first. Every drawing and revision registered before counting.
• Every line has a trail. Legend line, drawing number and revision beside each quantity.
• Gaps are flagged, not guessed. An unclear symbol becomes an open question.
• Your estimator signs off before pricing. Quantities locked before any rate goes on.
• Labour and markups come from your rules. Same way, every time.
• Addenda don’t mean starting again. You see what changed and the price impact.

Where does the time go on an electrical estimate?

Step	How it usually goes	The best setup
Sort the pack	Open every PDF and work out which revision is current	Every document and revision registered before counting
Scope notes	Hope you catch every “contractor to” note	Every “contractor to” note in one list
Fittings and runs	Count every symbol and measure every run by hand	BOQ in your layout, with cut-out, legend line, drawing number and revision per line
Unclear items	Guess to keep moving	Flagged as an open question, never guessed
Labour	Work it out line by line, from memory	Your labour rates and markups, set up as rules
Pricing	Look up price lists and retype quantities	Your rates, each with source and date; missing rates listed
The quote	Typed at the kitchen table after a day on site	A draft on your letterhead, costs and markups kept off it

Can you trust an AI electrical takeoff?

Not from one prompt. Drop the drawings into ChatGPT or Claude and you get a spreadsheet in seconds. Then: where did 42 downlights come from? Was that cable measured or made up? Those rates aren’t yours. So you redo it, and you’ve added a step. More in how to check every line of an AI takeoff before you price it.

Estimating is a process, not a task. So we set up the whole process: electrical estimating software as a custom plugin in your own Claude or ChatGPT account. It runs the 15 stages a good estimator works through, set up around your rates, BOQ template and quote. Four stages:

1. Measure. It registers every document and revision, lists every “contractor to” note and lays out the BOQ your way. Each line shows its drawing evidence and a tag. Unclear items are flagged, never guessed.
2. Approve. Your estimator checks number against picture and signs off. Sign-off locks that BOQ.
3. Price. Your rates, each with a source and date. Missing rates are listed for you. A draft quote on your letterhead, costs kept off it.
4. Addenda. Addendum in, change schedule out, with the price difference. Your original stays untouched.

Sample data. Each lighting line carries its evidence: the legend line, the plan markers counted, and the drawing number and revision.

One electrical contractor wrote: “Traced a random quantity back to the drawing sheet and revision in about ten seconds. That traceability is why I trust the rest of it.”

How should you price labour on an electrical job?

Labour is where a plausible number still loses money. Don’t leave it to memory on the night. Set your labour rates and markups up as rules, each with a source and date, applied the same way on every tender. A missing rate is listed for you, not guessed.

Sample data. Labour rates, markups and labour hours by section, each with its source and date.

How do you know it’s right before you rely on it?

We prove it on three of your priced jobs first: one run with you, two blind. The target is every row and the price matching to the cent. Where it differs, we fix the rules, never the answer.

You keep quoting as you do now, and switch once you’ve seen it match. When drawings change later, the change schedule shows what moved and the price impact, so an addendum doesn’t mean redoing your takeoff.

Where does your estimator still come in?

At every judgement call: BOQ sign-off, missing rates, the price and the quote. Nothing goes to the builder until you approve it. It takes the redoing and typing off your estimator, not the decisions.

Is it worth a look?

If you quote commercial electrical work from drawings and takeoffs and labour eat your evenings, yes. We set it up from three of your quoted jobs, your pricing sheet and your quote template. A fixed setup fee, confirmed on your call.

See how our estimating plugin works, and bring a recent tender to the call.