You get four electrical bids back for your commercial tenant improvement. They range from $68,000 to $112,000. The low bid looks suspiciously clean — one page, lump sum, no breakout. The high bid is 14 pages of detailed scope. Your gut says the low bid is missing something. Your gut is right.
Electrical work accounts for 10-15% of total construction costs on commercial projects, and it's one of the trades where bid differences are hardest to spot. Unlike framing or drywall, electrical scope lives in specifications that aren't visible on the finished product. A contractor can substitute 10-gauge aluminum wire for 10-gauge copper, save $8,000, and your inspector will flag it on day one of rough-in.
Here's what experienced GCs check when they're comparing electrical contractor bids — and the scope gaps and material substitutions that turn low bids into expensive problems.
Why Electrical Bids Are Uniquely Hard to Compare
Electrical bids are difficult to compare for a few reasons that don't apply to most other trades. First, the scope lives in the specifications, not the drawings. Two bids can reference the same set of plans and still price completely different work — because what's shown on a drawing set leaves room for interpretation on materials, installation methods, and included services.
Second, electrical pricing is highly sensitive to material costs, especially copper wire. With copper prices volatile and labor markets tight — the electrical industry faces a shortage of over 79,000 electricians according to the National Electrical Contractors Association — two contractors can have dramatically different material costs even for identical scopes.
Third, code compliance requirements vary by jurisdiction and inspector interpretation. One contractor prices to minimum code. Another prices to what they know your local inspector will actually require. The second bid looks higher on paper, but it's the one that gets your project through inspection.
Material Specifications: The First Place Bids Diverge
Material substitutions are the most common source of variance in electrical bids. If your specifications don't explicitly call out requirements, contractors will price to their preference — and those preferences vary significantly in cost and quality.
Wire: Copper vs. Aluminum
Copper wire costs roughly 3-4x more than aluminum wire of equivalent ampacity. For a large commercial project, the difference can reach $15,000-$40,000 on wire alone. Aluminum is code-compliant for most commercial branch circuit and feeder applications when installed properly, but it requires larger wire gauges, specific connectors, and anti-oxidant compound at every connection.
Make sure each bid specifies the wire material explicitly. 'Wiring per code' tells you nothing. You want 'THHN copper conductors, sizes per schedule' or equivalent specificity.
Conduit Type and Installation Method
Electrical Metallic Tubing (EMT), Rigid Metal Conduit (RMC), and Flexible Metal Conduit (FMC) each have different cost and application profiles. Some contractors price EMT throughout; others use flexible conduit in locations where EMT would require expensive fittings. Confirm which conduit types are specified and where.
Panels and Breakers
Panel brand and specification significantly affects both cost and long-term serviceability. A name-brand panel (Square D, Eaton, Siemens) with a 10-year warranty is worth more than a generic equivalent. Check that bids specify the panel brand, amperage, number of circuits, and whether the panel includes a main breaker or main lugs only.
What to Require
Ask each bidder to provide a materials list with specific product numbers or 'or approved equal' language for major components. If they can't or won't provide material specs, that's a red flag. Legitimate electrical contractors should know exactly what they're installing.
Scope Inclusions: What's In and What Gets Added Later
Scope gaps are where most electrical change orders originate. These are the items that one contractor includes as standard and another prices as add-ons — or excludes entirely. You won't know the difference until you're mid-project.
- Permits and inspections: Some contractors include all permit fees; others add them at cost-plus. On a large commercial job, permits can run $2,000-$8,000.
- Temporary power: Who provides and pays for temporary power during construction? It's often excluded from electrical bids and becomes a negotiating point.
- Trenching and site work: If underground conduit runs are required, who's doing the excavation and backfill? Electrical contractors often exclude this.
- Electrical room buildout: Panel rooms sometimes require fire-rated walls, ventilation, and dedicated lighting that aren't clearly assigned in the drawings.
- Testing and commissioning: End-to-end testing of circuits, panels, and emergency systems is critical but sometimes excluded from base bids.
- As-built drawings: Required for building records and future maintenance, but not always included unless you ask for them explicitly.
Common Missed Item
Emergency and exit lighting systems are frequently priced separately from general electrical work. If your project requires emergency lighting, confirm whether each bidder included it — and to what code standard. This alone can represent $5,000-$20,000 on a commercial project.
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Try it free — no credit card requiredCode Compliance: Not All Bids Are Built to the Same Standard
The National Electrical Code (NEC) gets updated every three years, and local jurisdictions adopt updates on their own timelines. A contractor who bids to a prior code cycle can legitimately price less work than one bidding to current code — and both claims can be accurate for their jurisdiction.
Arc Fault Circuit Interrupter (AFCI) and Ground Fault Circuit Interrupter (GFCI) requirements have expanded significantly in recent NEC editions. If your jurisdiction has adopted the 2023 NEC, the AFCI requirements alone may add $1,500-$4,000 to a residential project compared to a 2017 NEC bid.
Applying Bid Leveling to Electrical Proposals
With electrical bids, a systematic bid leveling process does more than just normalize pricing — it forces you to compare apples to apples on materials and scope, which is where the real differences live.
Start by creating a scope checklist based on your project specifications: wire material, conduit type, panel specs, permits, testing, and any specialty items. Then evaluate each bid against that checklist, getting add-on pricing for missing items from every bidder. This process often reveals that a bid 30% lower than the others is also 30% less complete.
Understanding the red flags in subcontractor bids is especially important for electrical work, where vague scope descriptions are common and expensive.
Red Flags Specific to Electrical Bids
Beyond the general warning signs that show up in any subcontractor bid, electrical proposals have trade-specific red flags worth watching for.
- No material specifications: A bid that says "wire and conduit as required" rather than specifying materials is leaving room for substitutions you won't like.
- Load calculations not provided: Any reputable electrical contractor should be able to provide load calculations that justify the panel size they're specifying. If they can't, the panel may be undersized.
- Missing permit line items: If permits aren't listed, ask whether they're included. A contractor who says 'that's your responsibility' is telling you something about how they'll handle other scope disputes.
- Vague commissioning language: 'Complete system' doesn't mean tested and verified. Ask specifically what their startup and testing protocol includes.
- No mention of as-built drawings: These are essential for future maintenance and often required by code. If they're not mentioned, they're probably not included.
Evaluating Electrician Qualifications
The ongoing shortage of licensed electricians means you'll encounter a wider range of capability among bidders than in other trades. Checking qualifications before you award is especially important on electrical work, where mistakes don't just cause delays — they create safety hazards and fail inspections.
Making the Award Decision
Once you've leveled the bids, verified materials and scope, and checked qualifications, the decision becomes clearer — but not always obvious. A higher bid from a contractor with a track record of first-time inspection passes and zero change orders may be worth more than a lower bid from an unknown quantity.
Think about total project cost, not just bid cost. An extra $8,000 for copper over aluminum wire is a real cost. But a failed inspection, re-work, and two-week delay on an occupied tenant improvement can cost $25,000 in delay damages, carrying costs, and contractor rework fees. The same approach applies to comparing contractor bids across any trade — the lowest adjusted price is rarely the whole story.
Final Thought
Electrical bid comparison rewards the GC who digs into the details. Take an hour before the award to verify materials, confirm scope inclusions, and check for red flags. That hour will save you multiples in change orders, inspection failures, and rework.