Lynden Roofing "Custom windows" covers more ground than people expect once you're actually standing in front of a Kendall opening. It might mean a replacement unit built to fit a rough opening from a farmhouse that predates any modern sizing standard, a bay window added on for a view toward the foothills, an egress window cut into a finished basement, or a matched set for a room addition that has to sightline with the rest of the house. Kendall sits east of Lynden, in the rural stretch of Whatcom County where the valley floor starts giving way to foothill and timber country, and out here older, site-built homes and larger, tree-covered lots make non-standard openings the rule almost as often as the exception. Add in the same wind-driven rain, salt-tinged marine air, and long moss season that shape exterior work across the rest of the county, and a custom window here isn't just a fit problem — it's a weatherproofing problem that has to be solved correctly the first time.
Why Kendall Homes End Up Needing Custom Windows
A handful of things push window projects out of stock-size territory more often here than in a denser, newer neighborhood closer to town. Many homes in and around Kendall were built decades ago, before window manufacturers settled on the standard rough-opening sizes used today, so a straight swap often means either ordering a custom unit or reframing the wall — and reframing brings its own cost and disruption most homeowners would rather avoid. Additions, converted outbuildings, and finished basements or bonus rooms create openings that don't match anything original to the house, and often trigger code-driven egress requirements that dictate a minimum size regardless of what's convenient. Plenty of properties out this way were also sited for a view — pasture, tree line, or the foothills rising toward the Cascades — which tends to mean a larger picture window or a bay projection rather than a standard stock unit.
None of that makes a project unusual for us; it's routine work in this part of the county. But it does change how the project starts. Custom work begins with careful, on-site measurement and an honest conversation about what the opening actually allows, not a catalog lookup, and it comes with a longer lead time than a same-size replacement, since custom units are built to order rather than pulled off a shelf.
The Climate Factor Custom Windows Can't Ignore
Kendall sits well inland from open water, so it doesn't take the direct salt spray some of our waterfront service areas see. It's still inside the same marine-influenced weather system that pushes moist air up the valley and into the foothills, though, and the heavier tree cover common on rural Kendall lots holds that moisture against a house longer than it would on a more open, sun-exposed property. Rain here tends to arrive wind-driven rather than falling straight down, pushing water sideways into window openings instead of letting gravity do the easy work a flat, uncomplicated install might assume. Shaded, damp corners of a wooded lot support a moss season that can run most of the year, settling onto sills, trim, and any surface that doesn't get a chance to drain and dry between storms.
Custom windows raise the stakes on all of that. A bay or bow window has more perimeter and its own small roofline to flash correctly. A large picture window built for a foothill or pasture view has a wider sill that has to shed water outward rather than let it collect. An arched or angled opening has cuts in the wall assembly that are harder to flash cleanly than a simple rectangle. None of this means a custom window is a bad idea for a Kendall property — it means the installation has to account for the added complexity instead of being treated like a routine stock swap.
Where the Risk Actually Lives
It's rarely the glass or the frame material that fails first on a custom unit — it's the transition points. Where a bay window's roof ties into the main wall. Where a wide picture-window sill meets the siding below it. Where an arched top gets cut into framing that was never built with a curve in mind. Those are the spots that need extra flashing attention, and they're also the spots a rushed installation is most likely to shortcut, because doing them right takes real time.
Custom Window Types We Build For
Custom doesn't mean one thing — the approach changes depending on what's actually being replaced or added.
- Non-standard replacement sizes — matching an opening in an older Kendall farmhouse or outbuilding that predates modern window sizing
- Bay and bow windows — projecting units that add interior space and open up a foothill or pasture view, with their own roof and flashing system
- Picture and large-format windows — fixed units that maximize a view without the cost of an operable sash
- Arched, angled, or specialty-shaped openings — architectural details that need custom-cut units and matching flashing details
- Egress and code-driven openings — finished basements and bonus rooms where the opening size is set by code, not convenience
- Matched sets for additions — new windows sized and placed to sightline correctly with the existing house
What a Correct Custom Window Job Involves
Measuring and Ordering
Custom work starts with a field measurement of the actual opening, not a number pulled from old plans. We check for out-of-square or out-of-level conditions, which are common in older Kendall homes that have settled over decades, and account for the clearance the finished trim and flashing will need. Because custom units are built to order, this is also where we set realistic expectations on lead time — weeks, not days — rather than a best-case guess that falls apart once you've already committed to a schedule.
Opening Prep and Structural Considerations
Larger custom units, bay windows especially, sometimes need structural support beyond what a standard opening requires, since they carry more weight and project outward from the wall plane. We evaluate that during the assessment, not as a surprise once the old window is already out. On older properties, this is often where we find out whether the original framing or flashing needs correction before a new unit goes in.
Flashing and Weatherproofing
This is the step that matters most in Kendall's climate. Every custom shape changes how flashing has to be sequenced — a bay window's roof needs its own weatherproofing separate from the wall flashing beneath it, a wide picture-window sill needs a real pitch to shed water outward, and an arched top needs flashing cut and lapped to follow the curve rather than run in a straight line. We build the flashing plan around the specific opening in front of us, not a generic template.
Finish and Trim Integration
Custom windows tend to sit in visually prominent spots — a bay window facing the drive, a picture window centered on a tree-line view — so the trim and finish work has to match the rest of the exterior cleanly. We plan that integration before the window ever arrives so the finished result looks like it belongs on the house rather than added on afterward.
A Quick Checklist Before You Order
- Confirm the opening has been field-measured, not estimated from old plans or a guess
- Ask what the flashing plan looks like for your specific shape, not a generic answer
- Get a realistic lead time in writing before you commit to a schedule
- Ask whether the opening needs structural review, especially for bay or oversized units
- Confirm what's covered under warranty — the window unit and the installation labor are often separate
- Ask how trim and finish will be matched to the rest of the exterior
Our Process, Start to Finish
- On-site assessment — we measure the opening, check square and level, and flag any structural or flashing concerns specific to the shape or size involved
- Honest recommendation — custom order, modified stock size, or a full opening reframe, explained with the reasoning behind it, not just whichever option is fastest to sell
- Ordering and lead time — a realistic timeline for the custom unit to arrive, since this isn't a same-week job
- Removal and opening prep — the old unit comes out carefully, and any hidden rot or flashing issues get addressed before the new window goes in
- Installation and flashing — the new unit is set, shimmed, and flashed to a sequence built for its specific shape and size
- Trim and finish — exterior trim integrated to match the surrounding siding and architecture
Costs and Trade-Offs: Custom vs. Stock
| Factor | Stock Window | Custom Window |
|---|---|---|
| Lead time | Often available quickly, especially common sizes | Built to order — typically weeks, depending on complexity |
| Fit | Limited to standard rough-opening sizes | Matched to the exact opening or design intent |
| Flashing complexity | Straightforward, well-documented rectangular details | Shape-specific — bay roofs, arched cuts, or wide sills each need their own plan |
| Structural review | Rarely needed for a like-for-like swap | Often needed for bay, bow, or oversized units |
| Cost | Lower, especially in common sizes | Higher, reflecting manufacturing and labor complexity |
| Best fit | Simple replacements in standard, unchanged openings | Older farmhouses, additions, view-driven designs, code-required egress |
What Actually Drives the Price
| Factor | Why It Matters |
|---|---|
| Size and glass area | More glass and larger units cost more to manufacture and are heavier to install |
| Shape complexity | Arched, angled, or curved units need specialty manufacturing and more flashing labor |
| Structural work | Bay and bow windows sometimes call for added support framing |
| Frame material | Vinyl, fiberglass, and wood-clad units differ in material cost and long-term upkeep |
| Opening condition | Rot, old flashing failures, or out-of-square framing add repair work before the new unit goes in |
| Number of units | A matched set for an addition typically has better per-unit pricing than a single custom window |
Frame Materials for This Climate
Frame material matters more on a custom unit than a standard one, since a larger or more exposed window has more surface area for moisture and salt-tinged air to work against over the years. We'll go through the honest trade-offs for your specific opening rather than defaulting to whatever's easiest to install. In general, fiberglass and vinyl frames hold up to Whatcom County's sustained moisture with less ongoing maintenance than an all-wood exterior finish, which is why we lead with them on weather-facing custom installs. A wood-clad interior with a durable exterior cladding can still be the right call when the interior look matters most and the exterior stays properly protected.
Why Local Experience Matters for This Kind of Work
Manufacturer installation guides are written for average, standard-size conditions on a simple rectangular opening. Custom windows in Kendall rarely fit that description, and the local climate doesn't make it any more forgiving — wind-driven rain and a long moss season stack the deck against a shortcut installation more than they would in a drier market. A crew that has actually built out bay windows, flashed arched openings, and reframed odd-sized rough openings on older homes in this part of the county knows which details in a manufacturer's guidance are non-negotiable here, and where extra time on flashing or sealant is worth it even when it isn't strictly required elsewhere.
That experience shows up in decisions that never make it into a sales conversation — how a bay window's roof ties into the main wall's drainage plane, how much lap a flashing course needs on a curved opening, when a sill needs a sloped composite cap instead of relying on caulk alone. Those are the details that decide whether a custom window is still performing cleanly in fifteen years or showing rot and drafts in five. It also means working with a crew that already understands the difference between a Kendall property and a denser in-town lot, rather than one that applies the same approach to both.
Ready When You Are
If you're planning an addition, replacing an odd-sized opening in an older Kendall home, or thinking about a bay or picture window to take advantage of a foothill or pasture view, it's worth having someone look at the actual opening before you start pricing units. We offer free, no-pressure estimates for custom window projects in Kendall and the surrounding area — use the form below to get a time on the schedule.