Getting a skylight installed during a roof replacement is almost always worth it. The roof deck is already exposed, skylights average $800 to $2,200 per unit to replace, and doing both together keeps labor shared and warranties intact.
Getting a skylight installed during a roof replacement is almost always worth it. The roof deck is already exposed, skylights average $800 to $2,200 per unit to replace, and doing both together keeps labor shared and warranties intact.
Skipping the skylight during a roof replacement is one of the most common decisions homeowners regret. When the seal fails a few years later, you’re back on the roof — paying twice for work that could have been done once.
Why the Answer Is Almost Always Yes
- Exposed Deck: The roof deck is already stripped during a roof replacement. Adding skylight work at that stage requires no extra teardown or setup from the crew.
- Shared Labor: Labor, setup, and disposal costs are divided across both projects when scheduled together. A standalone skylight job later means paying those costs all over again.
- No Double Work: Reusing old skylights during a re-roof often means opening up the new roof later when seals deteriorate. That repair disturbs finished work and adds unexpected cost.
- Warranty Intact: Replacing both at the same time keeps manufacturer warranties aligned on the roof system and the skylight unit. Reflashing old skylights onto a new roof can void both warranties.
- Energy Upside: ENERGY STAR certified skylights can reduce heating and cooling costs by up to 13% on average nationwide, compared to non-certified products. Bundling the upgrade delivers that return from day one.
- Age Alignment: Most skylights last 15 to 25 years. If your roof needs replacing, your skylights are likely on a similar timeline. Replacing both now avoids a near-term second project.
Bundled vs. Deferred: The Full Picture
| Factor | Replace Together | Replace Separately Later |
| Skylight cost range | $800–$2,200 per unit | $800–$2,200 per unit |
| Labor/mobilization | Shared with roof crew | Paid separately in full |
| Roof deck access | Already open | Must reopen finished roof |
| Warranty status | Both warranties intact | Reflashing may void coverage |
| Future leak risk | Low — new seals and flashing | Higher — old seals on new roof |
| ENERGY STAR savings | Up to 13% on energy costs | Same — but delayed |
| Overall value | Higher | Lower |
What Makes Sense for Your Home
Top Recommendation: Replace your skylights when the roof comes off — it’s the smartest, most cost-effective window to act. Schedule a free Coastal estimate today and get both projects scoped together.
If Your Skylight Is Newer: A unit installed within the last five years with no symptoms may not need replacement. Have a professional assess flashing compatibility before deciding.
Worth Knowing: Professionals recommend inspecting your roof at least twice a year, in spring and fall. That includes the skylight perimeter — catching deterioration early helps you plan the timing before it becomes an emergency.
Planning a roof replacement in Massachusetts, New Hampshire, or Maine? Coastal Windows & Exteriors is a GAF Master Elite certified roofing contractor, a distinction earned by only the top 2% of roofing contractors in North America. We’ve earned the GAF President’s Club Award seven consecutive years and completed 7,000+ installations across MA, NH, and ME.
Request a free roofing estimate from Coastal Windows & Exteriors.
Browse our complete roofing FAQ guide from Coastal Windows & Exteriors.
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Last Updated: July 2026
Sources:
- Skylight replacement costs between $800 and $2,200 per unit. Velux How Much Does It Cost to Replace a Skylight? Velux’s guidance on skylight replacement cost ranges for homeowners. (Accessed May 2026)
- Installing ENERGY STAR certified windows, doors, and skylights can reduce heating and cooling costs by up to 13% on average nationwide, compared to non-certified products. ENERGY STAR Windows, Doors & Skylights ENERGY STAR’s resource on certified product energy savings for homeowners. (Accessed May 2026)
- Homeowners should inspect their roof at least twice a year, in spring and fall. GAF Residential Roofing FAQs GAF’s guidance on roof inspection frequency and maintenance schedules. (2025)
