Skylight Replacement Cost: Two Units with New Flashing (2026 Baseline)
Two leaking deck-mounted skylights replaced like for like, with factory flashing kits, underlayment and patched-in shingles, itemized with crew hours.
Describe it
Every line, by trade
The skylights in the Clamp app: described in plain words, then the draft at $3,850 job cost, every line grouped by trade. Sample data.
The job at a glance
One build, fully itemized, with crew hours.
| Build | Job cost | Labor | Crew hours | Materials | Illustrative selling price |
|---|---|---|---|---|---|
| A. Two skylights, new flashing | $3,850 | $2,300 | 20 to 36 h | $1,550 | $5,005 to $7,700 |
Dump fees and other costs ($0) are the same in every build and included in the job cost. Materials include allowances. Illustrative selling price is the job cost at a 30% to 100% markup; your price depends on your own overhead and profit. Labor hours are a planning range and include setup, daily cleanup and material runs; they are never a charge to the customer. Permit and inspection fees are not included; requirements vary by jurisdiction.
The build in detail
A. Two skylights, new flashing: $3,850
Both old units come out, two comparable new units go in the existing openings, and the shingles around each are stripped, flashed with the factory kits and underlayment, and patched back in. Labor is $2,300 of the $3,850 job cost, or 59.7%. It is about 20 to 36 hours of work, including setup, daily cleanup and material runs.
Labor cost by trade
Labor only. Materials, allowances and dump fees are in the line items below. Hours are person-hours at typical production from Clamp’s labor hours catalog, as a range: a planning figure, not a schedule and not a charge to the customer.
| Trade | Hours | Labor cost | Low-Overhead×1.30 | Established×1.50 | Full-Service×2.00 |
|---|---|---|---|---|---|
| Carpentry | 13 to 27 h | $1,650 | $2,145 | $2,475 | $3,300 |
| Roofing | 2 to 7 h | $650 | $845 | $975 | $1,300 |
| Setup, cleanup and material runs | 1 to 6 h | in the prices | |||
| All labor | 20 to 36 h | $2,300 | $2,990 | $3,450 | $4,600 |
Every line item
Labor $2,300 + materials and allowances $1,550 + dump fees and other $0 = $3,850 direct job cost. Hours are person-hours at typical production, on labor rows only, and the direct-cost row adds about 15% for setup, daily cleanup and material runs; an allowance or material row names the labor line that installs it, and a subcontract row has none, because the sub’s price includes their own time. Some labor quantities include a difficulty factor, so they can exceed the measured area; each row’s derivation is in the downloadable data.
| Item | Qty | Unit | Hours | Labor | Material | Line cost |
|---|---|---|---|---|---|---|
| Electrical | ||||||
| Skylight Material AllowanceLabor on: Skylight Install Labor | 2 | ea | $0 | $1,150 | $1,150 | |
| Electrical subtotal | $1,150 | |||||
| Electrical subtotal | $1,150 | |||||
| Carpentry | ||||||
| Skylight Install Labor | 2 | ea | 13 to 27 h | $1,650 | $0 | $1,650 |
| Carpentry subtotal | 13 to 27 h | $1,650 | ||||
| Carpentry subtotal | 13 to 27 h | $1,650 | ||||
| Roofing | ||||||
| Skylight Flashing KitLabor on: Skylight Install Labor | 2 | ea | $0 | $400 | $400 | |
| Skylight Removal Labor | 2 | ea | 2 to 7 h | $650 | $0 | $650 |
| Roofing subtotal | 2 to 7 h | $1,050 | ||||
| Roofing subtotal | 2 to 7 h | $1,050 | ||||
| DIRECT JOB COST | 20 to 36 h | $3,850 | ||||
| DIRECT JOB COST | 20 to 36 h | $3,850 | ||||
Methodology & reproducibility
One reviewed snapshot for this build. The build is frozen from its own estimate run and priced by the published pricer.
Direct cost equals the sum of each row’s rounded quantity × (labor + material + other). Amounts are shown in whole dollars; every column adds to its total.
Scope selection, prose accuracy, arithmetic and provenance mapping reviewed; not independent market-rate verification.
- skylight-replacement-two/v1: JSON, CSV, field dictionary
Questions
Why replace the flashing and not just the skylight?
The leak is usually the flashing, not the glass. Factory kits with new underlayment, woven into stripped-back shingles, are most of the labor here and the reason the repair holds.
What if there is rot under the old units?
Deck rot shows up when the shingles come off and is priced when found. It is excluded from this build on purpose, so the base number stays comparable.
When is a whole roof smarter?
When the surrounding shingles are near the end of their life. This roof is about eight years old, so patching in makes sense; on a 20 year old roof, reflash during the reroof instead.
Sources & provenance
- Two skylights, new flashing reviewed snapshot Clamp Research