Bid More.
Win More.

How to Read an Electrical Bill of Materials (BOM)

If you've ever had a supplier quote come back and not match what you expected, the disconnect usually traces back to how the BOM was built, not the pricing itself. A Bill of Materials is really just a translation of the drawings into a shopping list, but a good one tells you a lot more than "what to buy."

Start with the line-item structure. Every BOM should break items out by category, not just dump everything into one list — devices and wiring devices, fixtures, gear (panels, disconnects, transformers), conduit and fittings, and wire and cable should each be their own section. If a BOM you're handed lumps everything together, that's usually a sign it was built fast and not double-checked against the drawings room by room.

Next, check quantities against unit of measure. Conduit and wire are typically listed in linear feet, but fittings, boxes, and devices are counted individually — a mismatch here (like wire quantities that don't account for waste factor, or fittings that don't match the conduit count) is one of the most common places estimates go sideways after the bid is won.

Third, look for what's tied to the drawings versus what's assumed. A defensible BOM should be traceable line by line back to a specific sheet, room, or circuit — that's what protects you if a GC or client questions a number later. If a BOM can't answer "where did this quantity come from," it's a guess, not a takeoff.

Finally, check for exclusions and clarifications. Every solid proposal package should spell out what's not included (permits, fees, temporary power, low-voltage unless specified) as clearly as what is. That's not paperwork for its own sake — it's what keeps a change order conversation from turning into a dispute.

A BOM you can trust is one you could hand to a second estimator and have them arrive at the same numbers. That's the standard we build every takeoff to.

Bid More, Win More — 5 Ways Faster Estimates Actually Win You More Work

Turnaround time gets treated like a convenience feature, but for electrical contractors it's closer to a competitive weapon. Here's why speed changes outcomes, not just schedules.

First, faster estimates mean you can bid more jobs in the same window. If a typical hard bid takes your team three to five days internally, you're capped at a handful of live bids at once. Cut that to 24–48 hours and the math changes — the same crew capacity now covers two or three times the bid volume, which directly increases your odds of winning something in any given week.

Second, speed lets you bid the jobs that come in late. GCs routinely send out ITBs with tight turnarounds, and a lot of qualified subs simply can't respond in time and self-select out. Being the sub who can turn around a number on short notice puts you in rooms your competitors never even see.

Third, it protects your margin conversations. When you're rushed, corners get cut on takeoff accuracy, and that shows up later as change orders you have to negotiate defensively instead of estimate accuracy you can stand behind. A fast process built for speed from the start (rather than compressed under deadline pressure) protects both your bid number and your credibility when it's time to true up actual costs.

Fourth, it frees your estimator to do the highest-value part of the job: reviewing scope and pricing strategy, not manually counting devices on a drawing set. Outsourcing or systematizing the mechanical parts of takeoff means the person setting your price is spending their time on judgment calls, not data entry.

Fifth — and this is the one people underestimate — responsiveness itself is a trust signal to GCs. A sub who turns around a clean, accurate number fast, bid after bid, becomes the sub a GC calls first next time, before the ITB even goes out to anyone else.

None of this works if speed comes at the cost of accuracy — that's the whole reason we built our process around a fixed 24–48 hour window with quantities tied line-by-line back to the drawings, not shortcuts.