Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total skylight installation cost
$1,850
Skylight unit cost
$700
Roof cutting & flashing
$700
Steep roof surcharge
$0
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How to use this
- 1Enter skylight type.
- 2Enter roof cutting & flashing ($).
- 3Enter interior drywall / light shaft finishing ($).
- 4Enter steep pitch or tile roof?.
- 5Read your total skylight installation cost on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Skylight installation cost combines the unit itself (fixed, vented, or tubular), roof cutting and structural framing to create the opening, flashing to keep the roof watertight around the new penetration, and interior drywall finishing to create the light shaft down to the ceiling below. This calculator prices these components separately since skylight type has an outsized effect on unit cost — a simple tubular skylight is far cheaper than a large vented skylight with electronic rain-sensing shades. 2026 US national averages run about $900-$2,000 for a fixed skylight fully installed, $1,800-$3,500 for a vented or solar-powered vented skylight, and $500-$1,000 for a small tubular skylight, which is popular for hallways and bathrooms because it requires minimal roof framing changes and no drywall light shaft. Roof pitch and roofing material also affect flashing complexity and cost — steep or tile roofs typically add 15-25% to installation labor versus a standard asphalt shingle roof with a moderate pitch.
Worked example
Using the values the calculator loads with:
Inputs
- Skylight type: Fixed skylight — ~$700 unit
- Roof cutting & flashing: 700 $
- Interior drywall / light shaft finishing: 450 $
- Steep pitch or tile roof?: No — standard pitch/shingle
Results
- Total skylight installation cost: $1,850
- Skylight unit cost: $700
- Roof cutting & flashing: $700
- Steep roof surcharge: $0
What each field means
Inputs
- Skylight type
- Pick the option that matches your situation — the maths changes per option. Choices: Tubular skylight — ~$300 unit, Fixed skylight — ~$700 unit, Vented / solar-vented skylight — ~$1,400 unit.
- Roof cutting & flashing ($)
- The roof cutting & flashing used in the calculation, measured in $. Starts at 700 $ so you have a working example on load. Accepted range: 200–2000 $.
- Interior drywall / light shaft finishing ($)
- The interior drywall / light shaft finishing used in the calculation, measured in $. Starts at 450 $ so you have a working example on load. Accepted range: 0–1500 $.
- Steep pitch or tile roof?
- Pick the option that matches your situation — the maths changes per option. Choices: No — standard pitch/shingle, Yes — add 20% surcharge.
Results
- Total skylight installation cost
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Skylight unit cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Roof cutting & flashing
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Steep roof surcharge
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What's the difference between a tubular and a traditional skylight?
A tubular skylight uses a small roof-mounted dome connected to a reflective tube that channels daylight down to a ceiling diffuser, requiring minimal framing changes and no drywall light shaft — making it much cheaper and faster to install than a traditional fixed or vented skylight, though it provides light only, not a view.
Why do vented skylights cost so much more?
Vented skylights include an operable sash, weatherstripping, and often an electric or solar-powered motor with a rain sensor to auto-close during storms — all of which add both unit cost and installation complexity compared to a simple fixed glass unit.
Does roof material affect skylight installation cost?
Yes — flashing a skylight into tile, slate, or metal roofing requires specialized flashing kits and more careful work than standard asphalt shingle, typically adding 15-30% to installation labor cost.
How likely are skylights to leak?
Modern skylights with proper flashing rarely leak from the unit itself; most leaks trace back to improper flashing installation or roofing that has degraded around the flashing over time — using an experienced skylight installer and inspecting flashing during routine roof maintenance meaningfully reduces this risk.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Skylight Installation Cost Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/skylight-installation-cost
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/skylight-installation-cost" target="_blank" rel="noopener">Skylight Installation Cost Calculator — RevenueLab</a> (2026).</p>
Source: [Skylight Installation Cost Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/skylight-installation-cost) (2026).