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This calculator vs. a flat "$800 a skylight" special
"$800 a skylight installed" is not a price for a skylight install — it is a price for one specific unit type, scope, and roof, quietly applied to every opening the truck pulls up to.
What a flat per-skylight special is
A flat special is the fastest way to quote: one headline number on a postcard or a website, read off and repeated. Homeowners shop it because it is easy to compare between bids, and it is the number a customer holding a competitor's flyer will ask you to match.
The number behind it was set for one job — usually the cheapest unit type (a tubular sun tunnel dropped into an existing chase), replacing an existing curb, standard asphalt flashing, no drywall shaft, single story — and then reused for every skylight afterward, whether or not the next opening looks anything like the one the rate was built on.
What this calculator is
This page keeps no account and sends nothing to a server. You enter the unit count and type — tubular sun tunnel, fixed glass, or solar venting — whether the job replaces an existing unit or is a new roof cut-in, the roof (asphalt, tile or metal, or low-slope), how many drywall light shafts it needs, extras such as ice-and-water shield, laminated glass, or interior shaft paint, story count, travel, and your loaded labor and overhead. It prices the unit, the cut-in and framing, the roof flashing, and the shaft work separately, and returns a walk-away price and an extra-work share below which the job loses money — for this roof, not a generic one.
| What a flat special does | What this calculator does instead |
|---|---|
| Charges the same headline price whether the job is a tubular sun tunnel into an existing chase or a solar-venting glass unit with a new cut-in — several times the unit cost and labor for the same word "skylight". | Prices the unit from the entered type, scope, and roof, so the two jobs above come out at different numbers instead of one. |
| Prices "a skylight" as one drop-in, with no separate line for cutting the roof deck, framing the opening, or building a drywall light shaft down to the ceiling. | Times cutting, framing, and shaft labor as their own extra-work hours, so that work shows up instead of being absorbed into the unit price or skipped. |
| Assumes standard asphalt flashing and no shaft, so a tile or metal roof, a low-slope curb, or a painted drywall shaft gets quoted the same as one that needs none of that. | Adds specialty roof flashing and shaft hours only for the roof and shaft count entered, so the two jobs price differently. |
| Bakes payroll burden into a round "labor rate" nobody re-derives, so the rate quietly drifts from the crew's real loaded cost. | Loads the entered hourly wage by the entered payroll-burden percentage every time, so labor cost tracks the actual burden rather than a memorized rate. |
| Gives the tech a price to quote, not a number to check a quote against when an owner asks to match a cheaper tube quote on a venting cut-in. | Reports the walk-away price and the extra-work share of the job, so a shopped price can be scored against real cost before the tech commits to it. |
A flat special is not wrong because it is simple — it is wrong when it is applied outside the one job it was built for, and nothing about a postcard rate tells you when that has happened. This calculator does not replace judgment about your market; it replaces the arithmetic a flat rate skips.
Common questions
Why does a flat per-skylight special get the price wrong?
Because the labor and material scale with unit type, scope, and roof, not with the word "skylight" alone. A tubular sun tunnel dropped into an existing chase on a single-story asphalt roof is a different job from a solar-venting glass unit needing a new roof cut-in, tile flashing, a drywall light shaft, and a second-story ladder. A flat special quotes both the same and is wrong on one of them every time.
What does a flat special usually leave out entirely?
The extra work a new cut-in drags in on top of the unit itself: cutting the roof deck, framing the opening, building the drywall light shaft, and running it up through a second story. A rate built around "install a skylight" has nowhere to put those hours, so a tech pricing off the special alone is short before the ladder goes up.
What happens when the roof or the shaft changes the job?
A flat installed rate assumes standard asphalt flashing and no light shaft. Tile or metal roofing needs specialty flashing, a low-slope roof needs a built curb and extra waterproofing, and any new cut-in usually means framing and painting a drywall shaft down to the ceiling. Each of those is its own material and labor line a rate never asked about, charged the same price for a job that takes longer and costs more.
Is a flat rate ever the right way to quote a skylight install?
For a narrow band of near-identical jobs — same unit type, replacing an existing curb, standard asphalt, no shaft, single story — a flat rate can land close. The risk is applying it outside that band without noticing, because the postcard rate does not know which band a given roof is in and neither does the tech until the walkthrough.
Does this calculator know what to charge in my market?
No. It has no data on local rates, equipment cost, or what competitors charge. It takes the unit type, scope, roof, shafts, extras, and your loaded labor and overhead, and turns them into a walk-away price and extra-work share for the job you describe — the arithmetic a flat rate skips, not a market survey.
Nothing here says or implies that quoting a flat per-skylight special is a bad-faith practice — it is a common, honest shortcut that works until the job stops matching the one the rate was set on. This page describes where that shortcut breaks down, not a fault in anyone who uses it.
Open the Skylight Install Bid Calculator and price your own job.