In Kendall, siding permits are issued by Whatcom County Planning & Development Services (PDS), not a city hall, because Kendall is unincorporated county land. Whether your project actually needs one depends on scope: a straightforward, like-for-like re-siding job over existing sheathing is often permit-exempt, while tearing off to the studs, replacing sheathing or house wrap, repairing rot, or adding wall insulation typically is not.
Whatcom County has no local building code of its own — it adopts the state-mandated codes set by the Washington State Building Code Council, primarily the International Residential Code (IRC) with Washington amendments, plus the Washington State Energy Code (WSEC) for anything touching insulation or the building envelope. PDS administers permitting and inspection for every unincorporated area of the county, which includes Kendall, Maple Falls, Deming, and the other Mount Baker Highway communities, as well as rural parcels around Sudden Valley that sit outside Bellingham's city limits.
Most jurisdictions in Washington, Whatcom County included, exempt cosmetic re-cladding from permitting: if a crew is removing old lap siding and nailing up new siding over the same weather-resistive barrier, on the same wall framing, with no change to window or door openings, that can often proceed without a permit. The moment the work goes further — pulling siding to inspect or repair sheathing, installing new house wrap, adding rigid foam or batt insulation to bring a wall up to current R-values, re-flashing windows, or correcting structural damage from long-term water intrusion — the project crosses into permitted work. At that point PDS wants a permit application, a site plan showing the structure and property lines, and product documentation for the siding and any insulation being installed.
The Washington State Energy Code matters here more than most homeowners expect. If a siding job opens the wall cavity for any reason, whether that's replacing rotted sheathing or simply because the contractor recommends adding a continuous insulation layer, the wall assembly generally has to meet current WSEC prescriptive requirements for that climate zone unless it qualifies for a repair exemption. That doesn't mean every re-side becomes an energy-code project, but it does mean the decision to open the wall — even for a small section — can trigger a compliance path that a simple recover job would have avoided.
Kendall sits in the foothills along the Mount Baker Highway corridor, closer to the Nooksack River and the base of the Cascades than to Bellingham Bay. That geography changes two things that matter for siding work. First, being unincorporated county land, there's no city building department to walk into — permitting, plan review, and inspection scheduling all run through the county seat in Bellingham, and rural review queues can move slower than a city's, especially during summer construction season. Second, the climate up here isn't quite the same as the coast. Kendall sees more freeze-thaw cycling through the fall and winter than Bellingham or Blaine, because elevation and distance from the Sound mean colder overnight lows more often. Water that gets behind siding and freezes in a wall cavity does real damage over a few seasons — swelling wood fiber, cracking caulk joints, and loosening fasteners.
Kendall properties also tend to be heavily wooded, with mature conifers shading roofs and walls for much of the day. That shade, combined with the region's persistent rain, is exactly the environment moss and algae need — north-facing walls and anything under a tree canopy will show green and black growth faster here than on an open, sun-exposed lot in town. Left alone, that moisture-holding growth is one of the more common reasons we find soft, rotted sheathing when we pull old siding off a Kendall home. Wind-driven rain off Bellingham Bay and the Strait of Juan de Fuca is a bigger factor for homes closer to the water in Blaine or Birch Bay; Kendall is more sheltered from that direct exposure, but the sheer volume of rain coming off the Cascades more than makes up for it in year-round moisture load on the building envelope.
Start with a phone call to PDS before you get a quote, and describe the scope as accurately as you can — recover only, or tear-off with sheathing repair. That single conversation determines whether you're looking at a same-week project or one with a permit and inspection timeline attached. If you already suspect rot, and on an older Kendall home with wood or early fiber-cement siding that's a real possibility given the shade and rain here, ask your contractor to do a moisture check on a few test areas before finalizing a bid, since discovering rot mid-project changes the scope and can push you into permitted territory partway through.
Alpine Exteriors handles this kind of project across Whatcom County, including the Kendall and Mount Baker Highway area, and we pull permits, schedule required inspections, and document WSEC compliance as part of the job when the scope calls for it. We're licensed in Washington as ALPINI751OW, and part of quoting a re-side honestly is telling a homeowner up front when a project is likely to need a permit rather than finding out partway through the tear-off.
It depends on scope. A direct recover — new siding installed over the existing sheathing and weather barrier, with no changes to window or door openings — is often exempt in Whatcom County. If the job involves removing old siding down to the sheathing, repairing rot, adding house wrap, or adding insulation, plan on a permit through Whatcom County Planning & Development Services.
Whatcom County PDS handles inspections for unincorporated areas, which includes Kendall. Depending on the scope, that can mean a weather-resistive barrier inspection before the new siding goes on, an insulation inspection if the wall cavity was opened, and a final inspection once the job is complete.
If the wall isn't opened up, generally no — a like-for-like recover doesn't trigger WSEC review. But if sheathing is replaced, insulation is added, or the wall assembly changes in any way, the affected portion of the wall typically needs to meet current WSEC prescriptive requirements, which can mean specific insulation values and continuous insulation detailing.
It varies with PDS's current review queue and the completeness of the application, and rural permits can sometimes move slower than city permits during busy construction months. A simple recover with no permit needed can start almost immediately; a permitted job with sheathing repair and an energy code review should be planned with extra lead time rather than assumed to move on a tight schedule.
If you're not sure whether your Kendall siding project needs a permit, or you're worried about what's hiding behind old siding after years of Whatcom County rain, Alpine Exteriors can walk the property, give you a straight answer on scope, and handle the Whatcom County PDS permitting and inspections if the job requires it. We work across Whatcom County — Bellingham, Ferndale, Lynden, Blaine, Birch Bay, Sudden Valley, and the foothills communities including Kendall — and we'd rather tell you a permit is needed up front than have an inspection stop the job halfway through. Reach out to Alpine Exteriors (WA license ALPINI751OW) to get a scope-honest assessment of your siding project.