- Elevating Exteriors – From Concept to Completion
- Elevating Exteriors – From Concept to Completion
If your roof is due for a full tear-off, replacing an aging skylight at the same time is almost always the right call rather than reflashing the old one and hoping it holds. Doing both together costs less than paying for two separate mobilizations and gives you one continuous, warrantied roof-and-skylight system instead of a patch job built around a unit that was never designed to outlast the shingles or panels around it.
Most residential skylights installed 15 to 25 years ago were built with aluminum frames, single or dual-pane glass with weaker seals, and flashing kits that were adequate for their era but fall short of what's available now. When a roofing crew is already tearing decking down to the sheathing, that's the one moment where a skylight can be pulled, the rough opening inspected and repaired if needed, and a new unit set with fresh, code-compliant flashing — all without cutting into a finished roof a second time later.
Reflashing an old skylight instead of replacing it can make sense if the unit is genuinely new, the glass is in good shape, and the only issue is worn flashing. But on anything older than about 12 to 15 years, the economics usually favor replacement: labor to remove and reset a skylight during an open reroof is a fraction of what it costs as a standalone job later, because the crew is already up there, the old roofing around the opening is already gone, and there's no need to weave new flashing into surrounding shingles or panels that have already weathered for two decades.
Skylight failures in this region rarely start as an obvious leak. More often it begins as a faint water stain on the drywall around the shaft, condensation between panes that means the seal has failed, or a slow darkening of the wood trim from years of minor moisture intrusion. By the time it's dripping, water has usually been tracking behind the flashing for a while, which can mean deck rot that a simple reflash won't fix. Catching that during a reroof, when the decking is already exposed, is far cheaper than discovering it later as its own emergency repair.
Costs vary depending on skylight size, whether it's fixed or vented, and whether it's a simple swap or a reframe, but homeowners in this area are typically looking at a few hundred dollars in added labor per unit when it's bundled into a reroof, plus the cost of the skylight itself, which commonly runs from several hundred dollars for a basic fixed unit to well over a thousand for a larger solar-vented model with electronic shade controls. Get a written, itemized number for your specific roof rather than relying on a rule of thumb.
Skylights here take a different kind of punishment than they do in drier climates, and it shapes how the replacement should be done. Winters across Skagit, Island and Whatcom counties bring long stretches of steady, heavy rain rather than short intense storms, which means flashing details have to shed water reliably over months of near-constant exposure, not just survive an occasional downpour. A flashing kit that's slightly undersized, or a step-flashing installation that's slightly off, will eventually show it — usually as the slow interior staining described above rather than a dramatic leak.
Moss is a real factor on shaded roofs throughout this area, especially on north-facing slopes under fir and cedar canopy in places like Sedro-Woolley, Burlington and the wooded lots around Lake Whatcom. Moss holds moisture directly against roofing material and against skylight curbs, and where it grows up against a skylight's upslope flashing it can hold water long enough to work its way underneath. Any skylight replacement in a mossy area should include clearing growth well back from the unit and setting flashing so the roofing material sheds cleanly around it rather than trapping debris.
Wind is a factor that varies noticeably even within this small service area. Homes out on the open Skagit flats near La Conner and Conway, and anywhere exposed to the Strait of Juan de Fuca or Rosario Strait around Anacortes and Camano Island, see steadier and sometimes stronger wind than sheltered inland spots. That matters for how a curb-mounted skylight is fastened and sealed, and it's part of why the flashing kit and fastening schedule should match the specific site, not just the roof type.
Salt air is a genuine consideration for anything near the water — Camano Island, La Conner, and the shoreline areas around Anacortes and Bellingham all see it. Salt-laden air accelerates corrosion on unprotected metal fasteners and lower-grade flashing over time, so skylight hardware and flashing on these properties benefit from corrosion-resistant materials, even though this isn't a coastal hurricane zone and doesn't need the wind-borne debris protections you'd see in a hurricane-prone state.
The foothills toward Concrete, Sedro-Woolley's eastern edge and the higher parts of Whatcom County get occasional snow load and periodic icing in a way the lowland areas around Mount Vernon and Burlington mostly don't. A skylight in one of those higher, colder spots needs flashing and glazing that can handle the freeze-thaw cycling of intermittent ice, even though this region never sees the sustained deep-freeze conditions of higher Cascades elevations or Washington's interior.
Finally, the Washington State Energy Code sets fenestration U-factor and, in some cases, solar heat gain requirements that apply to skylights as much as to windows. A reroof that includes a skylight swap is a natural point to bring an old, poorly insulated unit up to current code-minimum performance, which also tends to cut down on the condensation issues common to older single-pane or early dual-pane skylights during our cold, wet winters.
Start by having whoever is quoting your reroof physically inspect each skylight from both the roof and the interior ceiling, not just glance at it from a ladder. Ask directly whether they see any staining, soft decking, or seal failure, and ask them to state in writing whether they recommend replacement or reflashing and why.
Get the skylight replacement priced as a line item inside the reroofing quote rather than as a vague allowance. You want to know the brand and model being installed, whether it's fixed or operable, what flashing kit is specified, and whether that flashing kit is actually rated for your roofing material. Asphalt shingle, metal panel and cedar all use different flashing profiles, and skylight leaks often trace back to a flashing kit that was close enough rather than matched to the roof.
If your home sits in a shaded, moss-prone spot, ask about moss treatment and clearance around the new skylight as part of the job, not as a separate future expense. If you're near the water on Camano Island, in La Conner, or along the Anacortes or Bellingham shoreline, ask specifically about corrosion-resistant fasteners and flashing. If your home is up in the foothills toward Concrete or higher-elevation Whatcom County, confirm the glazing and flashing are specified for occasional ice and snow load, not just standard lowland conditions.
A leak at a skylight is one of the most common comeback calls in roofing, so get clarity up front about who's responsible if a problem shows up in year two or three. Alpine Exteriors handles skylight replacement as a standard part of reroofing throughout Skagit, Island and Whatcom counties, from Mount Vernon and Burlington out to Anacortes, Camano Island and La Conner, and up through Sedro-Woolley to Bellingham. We inspect every skylight before we quote, spec flashing to match the roofing material and site conditions, and won't push a replacement you don't actually need.
Yes, if the skylight is relatively new and in good condition, it's reasonable to reflash it and roof around it rather than replace the whole unit. The tradeoff is that any hidden wear on the seals or frame won't get addressed, and if it fails a few years later you'll be paying for a standalone skylight replacement instead of one bundled into work that was already underway.
Most quality skylights last somewhere in the range of 15 to 25 years before seals, flashing or glazing start to degrade enough to matter, though shaded, moss-prone, or salt-air locations can see issues show up sooner. Age alone isn't the only signal — a five-year-old skylight installed with substandard flashing can fail before a well-installed 20-year-old unit does.
Often yes, particularly if you're replacing an older single-pane or early dual-pane unit with a current, code-compliant one, since skylights are typically the weakest thermal point in a roof assembly. The Washington State Energy Code sets minimum U-factor requirements for fenestration, including skylights, and a reroof is the natural time to bring an old, drafty or condensation-prone unit up to that standard.
The most common mistake is treating the skylight as an afterthought priced with a vague allowance instead of getting a specific model, flashing kit, and installation plan in writing. The other frequent mistake is skipping the interior ceiling inspection, which can miss decking damage around the opening that only becomes obvious once the roof is torn open.
If you're planning a reroof anywhere from Mount Vernon, Burlington or Sedro-Woolley out to Anacortes, La Conner, Stanwood, Camano Island or Bellingham, have your skylights inspected before the crew shows up with a truck full of shingles. Alpine Exteriors — Washington contractor license ALPINI751OW — will look at each skylight, tell you plainly whether it needs to be replaced or can be reflashed, and give you a written price either way. No pressure, no guesswork.
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