Ferndale Siding Building New in Kendall? The Windows Deserve as Much Attention as the Foundation
If you're building a new home in Kendall, the window package is one of the few decisions that affects comfort, energy bills, and moisture control for the next 30-plus years. Unlike a replacement job, new-construction window installation happens before the siding goes on, which means there's no room for guesswork on flashing, water-resistive barrier (WRB) integration, or rough opening sizing. Get it right at this stage and the walls stay dry for decades. Get it wrong, and the mistake gets buried behind the siding, where nobody finds it until there's a stain on the drywall or soft trim years down the road.
We install new-construction windows on homes going up throughout Whatcom County, including builds in and around Kendall, and we frame every installation around the same question: how does this window perform once the weather that actually hits this part of Washington starts working on it, year after year?
What Whatcom County Weather Does to a New Window System
Driving rain and wind-blown moisture
Whatcom County storms don't just drop rain straight down — wind pushes it sideways into wall assemblies, and new construction is judged by how well it handles exactly that. A window unit can carry a good manufacturer rating and still leak if the flashing behind it wasn't lapped correctly with the WRB, or if the sill pan wasn't sloped to drain water back out instead of into the framing.
Moss and prolonged dampness
Whatcom County's long wet season keeps siding, trim, and window perimeters damp for extended stretches, and that dampness is what feeds moss and mildew growth on horizontal surfaces and in shaded corners. Sill design and drainage matter here as much as the glass — a window that holds standing water at the sill invites the same moss and staining problems you see on a north-facing roofline.
Temperature swings and condensation
Kendall sees colder overnight temperatures than areas closer to the water, and that gap between outdoor cold and indoor heat is exactly what drives interior condensation on undersized or poorly sealed windows. Correct glazing selection and an airtight rough-opening seal cut down on that condensation, which in turn protects the wood framing and drywall around every window.
Coastal-influenced air
Even away from the immediate shoreline, wind off the Salish Sea carries salt-laden moisture into inland areas of the county during storms. It's a smaller factor for Kendall than it is for waterfront lots, but it's still part of why we spec hardware and fasteners rated for a marine-influenced climate rather than a dry-climate standard.
Where New-Construction Window Installs Go Wrong
Almost every window leak we get called out to fix on a newer home traces back to one of a handful of installation mistakes — not a bad window. The window itself is rarely the problem.
- Flashing tape lapped in the wrong order, so water runs behind the WRB instead of over it
- No sloped sill pan, leaving a flat spot where water pools against the frame
- Rough openings cut too tight or too loose, stressing the frame or leaving gaps that get packed with expanding foam instead of proper backer rod and sealant
- Nailing fins fastened without the correct shim and fastening pattern, which can bow the frame and cause the sash to operate poorly for the life of the window
- Sealant used as the only water barrier instead of as a backup to correctly lapped flashing
We build our process around avoiding every item on that list, because each one is cheap to prevent and expensive to fix once siding and interior finish work are in place.
Choosing a Window Frame for a New Kendall Build
Frame material is the first real decision, and it should be driven by how the material handles sustained moisture and temperature swing, not just upfront price.
| Frame Material | Moisture Performance | Maintenance | Typical Lifespan |
|---|---|---|---|
| Vinyl | Good — won't rot, some expansion/contraction in temperature swings | Low; occasional cleaning | 20-30 years |
| Fiberglass | Excellent — dimensionally stable, holds seals well over time | Low | 30-40+ years |
| Wood-clad | Good on the exterior clad face, but any breach exposes wood to rot | Higher — clad face needs inspection, interior wood needs finishing | 20-30 years, dependent on maintenance |
| Aluminum | Weak on its own — conducts cold and needs a thermal break to control condensation | Low | 20-25 years |
For a new build in Kendall, we most often steer homeowners toward vinyl or fiberglass, since both hold up to sustained wet-season exposure without the maintenance burden or rot risk that comes with any breach in a wood-clad exterior face. Fiberglass costs more upfront but moves less with temperature, which keeps seals intact longer — worth it on larger openings or south-facing walls that see the biggest daily temperature swing.
Our New-Construction Installation Process
- Rough opening check — verify every opening is square, level, and sized correctly before a single window arrives on site
- Sill pan installation — a sloped, sealed pan under every window so any water that gets past the glazing drains outward, not into the framing
- WRB and flashing integration — flashing tape and housewrap lapped shingle-style, working top-down, so water always moves down and out
- Window setting and shimming — unit set plumb and square, shimmed at manufacturer-specified points to avoid frame distortion
- Fastening — nailing fin or block-frame fastened per manufacturer spec, not just "enough nails to hold it"
- Air-seal and insulate the gap — low-expansion foam or backer rod and sealant around the perimeter, sized to the actual gap
- Exterior trim and final flashing lap — head flashing installed last, lapping over the siding's WRB so the whole system sheds water in the right order
- Final operation check — every sash and lock tested before we sign off
Working Alongside Your Builder or GC
Most new-construction window jobs in Kendall come to us through a general contractor or as a homeowner coordinating their own build. Either way, timing matters: windows need to go in after the WRB is up and before siding starts, and the schedule has to line up with framing, electrical, and insulation crews without anyone waiting on anyone else. We work directly with your GC's schedule, show up with materials on hand, and communicate clearly if a rough opening needs adjustment before we can set a unit — better to flag it early than force a window into an opening that isn't ready.
Cost Factors for New-Construction Windows
| Factor | Why It Moves the Price |
|---|---|
| Frame material | Vinyl is the most economical; fiberglass and wood-clad cost more per unit |
| Window count and size | Larger openings and picture windows cost more per unit than standard operable sizes |
| Glass package | Upgraded low-E coatings and gas fills add cost but improve comfort and energy performance |
| Access and story height | Second-story or hard-to-reach openings take longer to set safely |
| Trim and flashing detail | Custom exterior trim profiles add labor beyond a standard flashing package |
We give homeowners and builders a broad range once we know the window count, sizes, and glass package — new-construction pricing varies too much project to project to quote a flat number without seeing the plans.
Checklist Before Windows Go In
- Rough openings match the window schedule on your plans, not just "close enough"
- WRB is installed and lapped correctly before window delivery
- Window schedule confirms frame material, glass package, and grid pattern for every opening
- Sill pan flashing is part of the install plan, not an afterthought
- Manufacturer installation instructions are on hand — warranty coverage often depends on following them exactly
- Delivery and install date are confirmed with your GC's overall schedule
Why a Crew That Already Works in Kendall Makes a Difference
New-construction window installation is a sequencing job as much as it's a hands-on trade. A crew that already works Kendall builds understands how the local wet season affects scheduling, knows what inspectors in Whatcom County look for at the flashing stage, and has already seen how the region's rain and moss season treats a poorly sealed sill years after the fact. That experience shows up in small decisions — how much lap to give flashing tape, where to add extra sealant, which openings need extra attention because of sun and wind exposure — that don't show up on a spec sheet but make the difference between windows that perform for 30 years and ones that start showing problems in five.
If you're planning a new build in Kendall and want the window package handled correctly from rough opening to final trim, we're glad to walk through your plans and put together a free, no-pressure estimate. Use the form below to get started.