Cost & Buying
Skylight Replacement During a Reroof: When It Makes Sense
The short answer
Skylights and roofs age on similar timelines, and the labor to flash a skylight is already happening during a reroof. If yours are 15+ years old or the seals are failing, replace them during the roof replacement — doing it later means paying twice to disturb the new roof. Newer skylights in good shape can be reflashed and kept.
Part of our guide to What a Roof Replacement Actually Costs in Washington & Oregon (2026).
Skylights are easy to forget about during a roof replacement — until one leaks through your brand-new roof a year later. Because skylights and roofs age on similar timelines and share the same flashing work, the reroof is the natural, cost-effective moment to deal with them. Here’s how to decide.
Why timing is everything
The costly part of a skylight replacement isn’t the unit — it’s accessing the roof, removing the surrounding roofing, and installing new flashing. During a reroof, all of that is already happening. Adding a skylight swap to the job is largely just the unit and a little more labor. Do it as a standalone project later and you pay for roof access and re-flashing all over again — on a roof you specifically don’t want to cut into. That’s the whole economic case: same work, done once.
When to replace during the reroof
Replace if your skylights are:
- 15+ years old. They’re near the back half of their life and will likely fail before your new roof does.
- Showing failing seals — fogging or condensation between the panes.
- Leaking or previously leaked — skylights are one of the most common roof leak points, and an old unit on a new roof is a leak waiting to happen.
- Builder-grade units you’d upgrade anyway for efficiency and light quality.
When to keep and reflash
If your skylights are relatively new and in good condition, they don’t need replacing — but their flashing does. Reusing old skylight flashing on a new roof is a classic shortcut that leaks. A proper reroof reflashes even a kept skylight with new materials, integrating it into the new roof correctly. That should be spelled out in what’s included.
A reroof is also the time to add light
Because the roof is open and the flashing is fresh, a reroof is the cleanest, cheapest moment to add a skylight or a solar tube to a dark hallway, stairwell, or bathroom. If you’ve wanted more natural light, cutting it in now beats disturbing a finished roof later.
The decision, simply
| Skylight condition | Do this during the reroof |
|---|---|
| 15+ yrs, fogging, or leaking | Replace it now |
| Newer, good condition | Keep it, but reflash with new materials |
| Wanted more light somewhere | Consider adding one while the roof is open |
The bottom line
Don’t put a fresh roof around a tired skylight. If yours are aging or failing, replacing them during the reroof is the rare upgrade that’s cheaper because of the timing — and it closes off one of the most common ways a new roof still ends up leaking.
Getting a new roof with skylights in the picture? Book a free inspection — we’ll assess each skylight and tell you honestly whether to replace, reflash, or add one while the roof is open.