Replacing a Roof With Skylights: Should You Replace Both Together?
If your home features skylights and it’s time for a full roof replacement, you face a common decision: Should you replace your skylights at the same time you replace your shingles?
While it may be tempting to keep existing skylights to save money upfront, roofing experts agree that replacing your skylights during a roof replacement is almost always the smartest, most cost-effective choice.
Here is why pairing these two projects protects your home and saves you money in the long run.
Why You Should Replace Skylights and Roofs Together
1. Skylights and Roofs Share the Same Lifespan
Standard asphalt shingle roofs last between 20 to 25 years. Coincidentally, high-quality skylights (such as VELUX units) have a functional lifespan of 15 to 20 years.
If your roof is old enough to require replacement, your skylights are likely approaching the end of their reliable service life. Leaving an 18-year-old skylight nestled inside a brand-new 25-year roof creates a weak point in your home’s defense.
2. Flashings Are Single-Use Components
The number-one cause of skylight leaks isn't the glass—it's the flashing system around the frame.
To properly replace a roof, roofers must tear off old shingles down to the decking around the skylight. Re-using old skylights requires fitting new shingles around aged, brittle flashing or trying to re-seal old components. Installing a new skylight allows the roofing crew to integrate fresh, factory-engineered flashing directly into the new roof underlayment, ensuring an airtight, watertight seal.
3. Cost Savings on Combined Labor
Replacing a skylight on its own requires removing surrounding shingles, installing new flashing, and blending old and new materials—a labor-intensive process.
When done concurrently with a roof replacement, the labor cost to drop in a new skylight is significantly lower because the roof decking around the opening is already exposed and prepared.
Signs Your Current Skylight Needs to Go
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If you are evaluating your roof, check your skylights for these red flags:
- Condensation Between Glass Panes: Indicates the insulating seal has failed, allowing heat to escape and moisture to collect.
- Cracked or Yellowed Lenses: Common in older acrylic dome skylights exposed to years of harsh UV rays.
- Water Stains on Drywall: Discoloration around the interior ceiling drywall points to flashing or seal failure.
- Drafts or Excess Heat: Older single-pane or non-coated skylights let extreme summer heat flood your living space.
Upgrading to Modern Energy-Efficient Skylights
Replacing an old skylight isn't just about leak prevention—it’s an efficiency upgrade. Modern skylights feature:
- Low-E Argon Gas Glass: Reflects solar heat gain in summer while retaining indoor warmth in winter.
- Laminated Clean-Quiet Glass: Reduces exterior rain noise while adding impact safety.
- Solar-Powered Venting & Blinds: Many modern skylights qualify for federal energy tax credits, helping offset installation costs.
Expert Roofing & Skylight Installation in Virginia
Don't risk water damage by putting a new roof around an old skylight. At Exterior Techs, our factory-certified roofing teams specialize in complete roof replacement and seamless skylight integration across Northern Virginia and Central Virginia. Every roof replacement comes backed by our 10-Year Workmanship Guarantee.
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Written with 20 years of hands on experience in Virginia.
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