How Long Does It Take to Install a Skylight?
Quick Answer
4–8 hours for a professional installation of a single skylight. Replacement skylights take 2–4 hours, while new installations requiring roof framing modifications take 6–8 hours.
Typical Duration
Quick Answer
Installing a skylight takes 4–8 hours for a professional crew. The timeline depends heavily on whether the skylight is a replacement (using an existing opening) or a new installation that requires cutting through the roof deck and modifying framing. Tubular skylights are the fastest to install at 2–3 hours.
Installation Time by Skylight Type
| Skylight Type | New Installation | Replacement | DIY Feasibility |
|---|---|---|---|
| Fixed (non-opening) | 4–6 hours | 2–3 hours | Moderate |
| Vented (manual) | 5–7 hours | 3–4 hours | Moderate |
| Vented (electric/solar) | 6–8 hours | 3–5 hours | Low (wiring needed) |
| Tubular / sun tunnel | 2–3 hours | 1–2 hours | High |
| Custom / oversized | 8–12 hours | 5–7 hours | Not recommended |
New Installation vs. Replacement
New Installation (6–8 Hours)
A new skylight installation involves cutting through roofing material, decking, and potentially modifying roof rafters or trusses. This is the more complex and time-consuming scenario.
| Step | Time |
|---|---|
| Mark layout and verify interior/exterior alignment | 30–45 minutes |
| Cut roof opening from interior | 30–45 minutes |
| Remove roofing material around opening | 20–30 minutes |
| Install headers and modify framing (if needed) | 1–2 hours |
| Set skylight and secure to frame | 30–45 minutes |
| Flash and waterproof perimeter | 1–1.5 hours |
| Replace surrounding shingles | 30–45 minutes |
| Build and finish interior light shaft | 1–2 hours |
| Clean up and inspection | 30 minutes |
Replacement Installation (2–4 Hours)
Replacing an existing skylight uses the same opening and framing, cutting the timeline roughly in half.
| Step | Time |
|---|---|
| Remove old skylight and flashing | 30–45 minutes |
| Inspect and repair framing if needed | 15–30 minutes |
| Install new skylight unit | 30–45 minutes |
| Install new flashing kit | 45–60 minutes |
| Reseal and replace shingles | 20–30 minutes |
| Interior trim and finishing | 15–30 minutes |
Factors That Affect Installation Time
Roof Pitch and Material
| Roof Type | Time Impact |
|---|---|
| Asphalt shingle (standard pitch) | Baseline |
| Metal roofing | +1–2 hours (special flashing) |
| Tile or slate | +2–3 hours (fragile, heavy) |
| Flat / low-slope roof | +1 hour (curb-mounted required) |
| Steep pitch (>8:12) | +1–2 hours (safety, staging) |
Rafter Spacing and Framing
Standard skylights are designed to fit between rafters spaced 16 or 24 inches on center. If the skylight width exceeds the rafter bay, one or more rafters must be cut and headers installed. This structural modification adds 1–2 hours and may require a building permit.
Interior Light Shaft
The light shaft connecting the skylight to the ceiling is often the most time-consuming part of a new installation. A straight shaft (ceiling directly below the roof) takes 1 hour. A splayed or angled shaft through attic space requires framing, insulating, drywalling, and finishing — adding 2–4 hours and often requiring a second-day visit for joint compound drying.
Electrical Wiring
Electric or solar-powered vented skylights need wiring for the motor and optional rain sensor. Solar models with integrated panels are faster (no home wiring needed, just a connection to the motor). Hard-wired electric models add 1–1.5 hours for an electrician.
Tubular Skylights (Sun Tunnels)
Tubular skylights are the simplest option, using a small dome on the roof connected to a reflective tube that channels light to a diffuser lens in the ceiling. No framing modification or light shaft construction is needed in most cases.
| Component | Installation Time |
|---|---|
| Cut roof hole and install dome | 30–45 minutes |
| Route reflective tube through attic | 30–60 minutes |
| Cut ceiling hole and mount diffuser | 20–30 minutes |
| Seal and flash roof penetration | 20–30 minutes |
DIY vs. Professional Installation
Experienced DIYers can install a fixed skylight in 6–10 hours. The critical skill is proper flashing — improper waterproofing is the leading cause of skylight leaks. Professional installation typically costs $500–$1,500 for labor and includes a workmanship warranty against leaks.
Tubular skylights are the most DIY-friendly option, with most manufacturers including complete installation kits and requiring only basic tools. Most homeowners complete a tubular skylight in 2–4 hours.
Permits and Inspections
Many jurisdictions require a building permit for new skylight installations, especially when roof framing is modified. The permit process adds 1–3 weeks of lead time but does not affect the installation day itself. Replacement skylights in the same opening typically do not require a permit.