How to Read a Commercial Cabling Bid (and Spot the Corners Being Cut)
You've collected three bids for a cabling project, and they're thousands of dollars apart. The instinct is to assume the companies are quoting the same work and the cheapest one is simply the best deal. They almost never are quoting the same work. Cabling bids look alike on the surface, but the differences that matter are often the things left unstated — and those omissions are exactly where the low price comes from.
You don't need to be a cabling expert to evaluate a proposal well. You need to know what to look for and what to ask. Here's a field guide.
Start With the Cable Itself
The first question is what's actually going in the walls, specifically:
Category and construction. Cat 6, Cat 6A? And is it built with solid copper conductors — not copper-clad aluminum (CCA)? CCA is cheap cable with an aluminum core and a thin copper coating. It has higher resistance, performs worse, runs hotter under PoE, poses a real fire risk, and doesn't meet the standards it's often sold under. A bid priced suspiciously low is sometimes low because it's quoting CCA. Insist on solid copper, and get the manufacturer named.
Fire rating. Building codes require plenum-rated cable in air-handling spaces (the plenum-rated jacket produces less smoke when it burns). Using cheaper riser-rated or general cable where plenum is required is a code violation — and a way to shave cost that you'd never see until an inspector does.
If a proposal is vague about the exact cable and its construction, that vagueness is itself informative.
Then Ask the Question That Separates Real Bids From Cheap Ones: Testing
This is the big one. Nearly every proposal will say the work is "tested." As covered in depth elsewhere on this site, "tested" ranges from a thirty-second continuity check to full certification against the TIA standard. They are not remotely the same, and the price difference between them is real.
Ask specifically: Is 100% certification testing included, and will I receive the reports? Certification measures every link against the full standard and produces documented proof it meets spec. A quick wiremap "test" tells you the cable is connected but nothing about whether it performs. If a bid doesn't explicitly include certification of every link with documentation delivered, assume it doesn't — and know that a competitor's higher price may simply be the cost of proving the work is right.
Warranty: Installer's Word vs. Manufacturer-Backed
"Lifetime warranty" appears on many proposals. The question is what stands behind it.
There are two kinds. An installer warranty is the company's own promise to fix problems. A manufacturer system warranty — 15, 20, 25 years from the likes of the major cabling manufacturers — is backed by the manufacturer, and it's granted only when a *certified installer* uses *certified components* and submits *certification test results* proving the system was installed to spec. That last kind is far stronger, and notice what it requires: certified people, certified parts, and certification testing. A warranty claim with no certification data behind it rests on nothing. Ask which warranty you're getting, and what's required to keep it valid.
Who's Doing the Work
Credentials are a proxy for whether the work will meet a real standard. Look for BICSI training and manufacturer certifications — the latter are usually a prerequisite for that manufacturer's system warranty anyway. An installer's certifications tell you the crew has been trained to a recognized standard rather than learning on your building.
The Parts of the Job That Hide in the Fine Print
Several cost-drivers are easy to omit from a bid and expensive to discover later:
Pathways and support. Is the cable properly supported with J-hooks or cable tray at correct intervals, or draped across the ceiling grid and resting on tiles — which is both a code violation and a reliability problem? Proper support and pathways take labor and materials that a corner-cutting bid may skip.
Firestopping. Every time cable penetrates a fire-rated wall or floor, code requires the penetration to be properly sealed to maintain the fire barrier. It's routinely skipped on cheap installs, and it's both a life-safety issue and an inspection failure.
Labeling and documentation. A properly labeled system with as-built documentation is something you and every future technician can actually work with. An unlabeled tangle costs you every time anyone has to troubleshoot or add to it. Ask whether labeling and documentation are included.
Grounding and bonding, especially for shielded systems, done to standard.
Scope specifics. How many drops? Does the price include jacks, patch panels, patch cords, termination, and testing — or are some of those "additional"? Ambiguity here is where change orders are born.
The Red Flags, in One List
When you're comparing proposals, treat these as warnings:
A price far below the others (something is being left out — find out what)
CCA cable, or refusal to specify cable construction
"Tested" with no mention of certification or delivered reports
No manufacturer system warranty, or vagueness about what the warranty requires
No labeling, documentation, or as-builts included
Vague scope — unclear drop counts or "additional" items lurking
Make It Apples-to-Apples
The single most useful thing you can do is normalize the bids before comparing price. Write down the same scope — same cable spec, same certification and documentation, same warranty, same pathway and firestopping expectations — and ask each bidder to price *that*. Once every proposal covers the same real scope, the price differences shrink dramatically, and the number that's left actually means something. Much of what looks like a bargain up front is simply a bid that quietly excluded the parts that make cabling last.
How O.B. One Bids
Everything above is simply how we quote a job. We specify real, solid-copper, standards-compliant cable and name it. We include 100% certification testing with the reports delivered. We carry the manufacturer and BICSI certifications that back a genuine system warranty, and we add our own 100% lifetime warranty on top. We support and pathway cable properly, firestop penetrations, label and document the system, and write a scope that says what you're actually getting. Our aim isn't to be the cheapest bid in the stack — it's to be the one where the price reflects the whole job, done right, with nothing hidden.
The Bottom Line
A cabling bid is only as good as what it specifies, and the cheapest proposal is often cheapest because of what it left out — CCA cable, skipped certification, a hollow warranty, no documentation, missing firestopping. None of it is visible on installation day; all of it surfaces later, usually at a cost that dwarfs the original savings. Read the bids for what they include and what they carefully don't, normalize them to the same scope, and you'll make a decision based on value instead of a number. Your cabling is going to run your business for the next two decades. It's worth reading the fine print once.