How to Build a Low-Voltage Estimate: Material, Labor, and Markup

A low-voltage estimate turns your takeoff into a priced bid by costing out material, adding labor hours, and applying markup, overhead, profit, and tax. The takeoff tells you *what* and *how much*; the estimate tells you *what it costs* and *what to charge*. This guide walks the rollup from raw quantities to a final number, plus the items most likely to make a bid quietly come in low.

Start with an accurate takeoff

Everything downstream rides on your quantities, so get the footage right first. Measure each cable run, then add the parts of the run that don't show on a flat plan:

Vertical drops — ceiling-to-outlet at the device end, and the climb up to the pathway.
Service loops and slack at both ends for termination and future moves.
Waste factor — roughly 10-15% (it varies) for cuts, pulls, and mistakes.

Keep an eye on design limits while you're at it: a structured-cabling channel maxes out at 100 m (328 ft) and the permanent link at 90 m (295 ft), with the ~10 m (33 ft) difference reserved for patch and equipment cords. These are general design guidance, not a substitute for the published standard or a licensed RCDD/PE review — but they help you catch a run that's too long before it lands in the bid.

Price the material

Take your counted quantities and apply your distributor pricing line by line. Cable is sold by the foot or per box, so convert your total footage into the units your supplier quotes.

Material usually includes:

Cable (by type and footage)
Jacks, faceplates, patch panels, and patch cords
Pathway and support hardware — J-hooks, conduit, fittings
Terminations, labels, and consumables

Use live distributor pricing, not last year's numbers. Copper and connectivity prices move, and a stale price sheet is one of the easiest ways to underbid.

Add labor hours

Labor is where most estimates win or lose money. A common rough rule of thumb is about 11 hours per 1,000 ft of cable installed — useful for a first pass, but it varies a lot with site conditions. Open ceilings, conduit fill, fished walls, occupied spaces, and after-hours work all push hours up.

Convert hours to dollars at your loaded labor rate (wage plus burden — taxes, insurance, benefits). For a quick sanity check:

> Total footage ÷ 1,000 × 11 hr = rough labor hours > Labor hours × loaded rate = labor cost

Treat that as a starting point. If the job is mostly conduit pulls or tight retrofit work, adjust upward based on your own production history.

Roll up material, labor, and markups

Now stack the numbers. The order matters because each markup builds on the subtotal beneath it:

Material cost + labor cost = base cost
Add overhead (your cost of doing business — vehicles, tools, office) as a percentage of base cost
Add profit as a percentage on top
Add sales tax where it applies, on the taxable portion

A simple worked example: if material is $8,000 and labor is $6,000, your base cost is $14,000. Apply 15% overhead ($2,100) and 10% profit ($1,610 on the $16,100 subtotal), and you're at $17,710 before tax. Then add tax on whatever portion is taxable in your jurisdiction. Swap in your own percentages — the structure stays the same.

Flag unpriced items so the total is never quietly low

The most dangerous line in any estimate is the one that isn't there. Before you send the bid, scan for anything carried at zero:

A cable type or connector with no distributor price filled in
Pathway or support hardware counted but not costed
Specialty items (firestop, plenum-rated materials, testing labor) left off
Allowances for work you know is coming but haven't quantified

An item with a blank price doesn't error out — it just silently drops your total. Make a habit of listing every unpriced item explicitly so you either price it or consciously exclude it in your scope notes. A bid that's transparent about what's *not* included protects your margin and your relationship with the customer.

Tie it together

Building an estimate by hand in a spreadsheet works, but it's slow and easy to get wrong when prices change or a line gets missed. Cable Takeoff rolls your material counts, labor hours, and markups into one live bid, so the total updates as you go and unpriced items are easy to spot. Your drawings are processed in your browser and stored encrypted to your account, with a 14-day free trial and no card required.