Bellingham's mild wet winters send steady rain against skylights for months, and homes built before 1980 in Sehome and York often have original curb flashings that have pulled away from the deck. We see leaks where the step flashing meets the skylight frame because the original lead or aluminum has corroded from constant moisture and moss. In these older stock houses the roof deck itself can be single-layer plywood that flexes under foot traffic, so any repair must include new underlayment and tapered shims to restore slope away from the curb.
Whatcom County code requires that skylight replacements maintain the same fire rating as the surrounding roof assembly, which means we match the existing composition shingles or standing-seam metal rather than installing a generic curb. Near Bellingham Bay the salt air accelerates corrosion on aluminum frames, so we use stainless-steel fasteners and butyl tape on every joint. Homeowners in Fairhaven frequently discover the leak only after water has traveled ten feet down the ceiling joists, so we always run a moisture meter along the rafters before closing up the ceiling.
Access on two-story homes in the Barkley neighborhood is often limited by steep driveways and mature trees, which changes how we stage materials and whether we need a boom lift from a nearby side street. We never rely on sealant alone; every repair includes new counter-flashing tucked under the existing shingles at least six inches uphill. This approach prevents the same leak from returning the next winter when temperatures hover just above freezing and ice dams form along the skylight curb.
Technician insight
In Bellingham the thing that catches most people out with Skylight Leak Repair is how quickly moss on north-facing roofs in Cornwall Park and near Whatcom Falls Park holds water against the curb all winter. Homeowners assume a bead of caulk will fix it, but once the original flashing has lifted from the deck the only lasting fix is new metal tucked under the shingles uphill.
Sehome Two-Story Leak
Water stains appeared on the second-floor ceiling after three weeks of steady rain. We found the skylight step flashing had pulled away on the uphill side where the original lead had split. We replaced the flashing with copper, added new butyl tape, and restored the cedar shingles so the repair disappeared from the street.
Skylight Leak Repair Services We Offer
✓Skylight Flashing Replacement
Remove failed step and apron flashing around the curb and install new copper or stainless flashing bedded in butyl tape to stop water entry during Bellingham's prolonged winter rains.
✓Curb Sealant Renewal
Clean and re-seal the joint between the skylight frame and curb with high-grade polyurethane that stays flexible through freeze-thaw cycles common in Whatcom County.
✓Condensation Drain Installation
Add a small weep hole and channel at the base of the skylight to route trapped moisture outside before it drips into finished ceilings in older Sehome homes.
✓Skylight Frame Corrosion Repair
Treat and coat corroded aluminum frames on homes near Bellingham Bay where salt air accelerates pitting, then reinstall with new gaskets.
✓Skylight Glass Panel Replacement
Swap cracked or delaminated insulated glass units while preserving the existing curb and flashing on Fairhaven Victorians that cannot accept modern curb heights.
Skylight Leak Repair Cost in Bellingham, WA
| Service | Typical Range | What Affects It |
|---|---|---|
| Flashing and Sealant Repair | $450–$750 | Single skylight on one-story home in Fairhaven or Sehome |
| Glass Panel Replacement | $650–$950 | Insulated unit plus new gaskets on two-story homes |
| Full Curb Rebuild | $900–$1,400 | Includes new underlayment and tapered shims when deck has rotted |
| Moisture Mapping Add-On | $125–$175 | Required when water has traveled across multiple rafters |
Ranges are typical for Bellingham, WA and confirmed with an exact written quote before any work starts.
How it works
- 1
On-Site Moisture Mapping
We scan the ceiling and roof deck with a moisture meter and mark every wet rafter in neighborhoods like Cornwall Park and Happy Valley.
- 2
Curb and Flashing Inspection
Remove shingles uphill of the skylight to examine step flashing condition and check for deck rot caused by years of Whatcom County rain.
- 3
Targeted Repair or Replacement
Install new flashing, sealant, or glass as needed, then restore shingles with matching material so the repair blends on homes in Downtown Bellingham.
- 4
Final Leak Test and Documentation
Run a controlled water test and photograph the completed work before leaving the site in Lynden or Ferndale service calls.
Pricing
Upfront written quotes after inspection; most skylight leak repairs in Bellingham fall between $450 and $1,400 depending on access and whether glass or flashing must be replaced.