Birch Bay Siding Sandy Point sits out on a low, narrow strip of land near Birch Bay, with water close on more than one side and very little standing between the houses and the weather coming off the Strait. That setting changes what "custom windows" means here compared to a more sheltered inland neighborhood. Lots were platted tightly, many of the original homes started life as smaller seasonal cabins, and a good number of properties face open water on two sides rather than one. Add all of that up and a straightforward stock-size window replacement is often not what the job actually needs.
We treat custom windows as their own category of work, separate from a routine like-for-like swap. The measuring, the flashing sequence, the lead time, and the installation details all change once a window stops being a standard size or shape — and on a spit this exposed, getting those details right matters more than it would a few miles inland in Whatcom County.
Why Sandy Point Homes End Up Needing Custom Windows
A few things push window projects in this neighborhood out of stock-size territory more often than average. The lots here were platted close together on a narrow spit, which means side-yard clearances are often tighter than a standard window unit and its trim were designed around — a straight swap can end up needing a resized opening just to keep proper clearance from a neighboring wall or property line. Many homes also started out as smaller vacation cottages built decades ago, before manufacturers standardized the window sizes sold today, so an original opening frequently doesn't match anything currently in production.
On top of that, a lot of remodeling work in Sandy Point involves converting what used to be seasonal space into year-round living area — finishing a back bedroom, adding a den, extending a cottage into a full-time home. Once a room is classified as a bedroom or habitable space, code sets a minimum window opening size for emergency egress, and that minimum doesn't always line up with what's already there or with a stock replacement size. And because so many lots here have water visible on two sides rather than one, it's common for homeowners to want a larger fixed or picture window to take advantage of both view lines, which almost always means custom sizing.
None of this makes a project unusual for us — it's routine work on this stretch of the spit. It does mean the job starts with careful field measurement and an honest conversation about lead time, since a custom unit is built to order rather than pulled off a shelf.
The Climate Factor Custom Windows Can't Ignore
Being surrounded by water on more than one side puts Sandy Point in a tougher spot than most of Whatcom County's coastline. There's little in the way of bluffs or tree cover to break the wind here, so window assemblies take load from more directions than they would on a more sheltered lot — not just the prevailing weather off the Strait, but wind that wraps around from the water side of the property too. Salt-laden air moving across the spit accelerates corrosion on hardware, fasteners, and lower-grade frame components faster than it would a few miles inland. Storms and even routine wet-season weather push rain sideways into wall assemblies and window flashing instead of letting gravity handle it, so water finds gaps that would go untested somewhere calmer. And the shade and dampness common on north- and east-facing walls support a moss and mildew season that runs most of the year in this part of Whatcom County.
Custom windows raise the stakes on all of that. A wide picture window built to capture a second view line has more glass area for wind to push against and more sill to shed water off of. A resized egress opening has a new flashing detail tied into an older wall assembly that may not have been touched in decades. None of this rules out custom work — it means the installation has to account for the added exposure instead of treating it like a routine stock swap.
Where the Risk Actually Lives
The glass and frame material are rarely what fails first on a well-built custom unit here. It's the transition points — where a resized opening meets the original wall assembly, where a wide sill meets the siding below it, where a corner grouping of windows ties two wall planes together. Those spots need extra flashing attention, and they're also the spots a rushed installation is most likely to shortcut, because they take real time to get right.
Custom Window Types We See in This Neighborhood
- Non-standard replacement sizes — matching an opening in an older cottage that predates modern window sizing standards
- Egress-driven resizing — enlarging or reworking an opening when a cottage room is converted into a year-round bedroom or living space
- Picture and large-format windows — fixed units sized to take in water views on two sides of a corner lot, with more glass area to manage structurally
- Corner and multi-wall window groupings — units designed to work together across two wall planes on tight, close-set lots
- Reframed openings for additions — new rough openings that need correction before a window can go in cleanly
- Matched sets for remodels — new windows sized to sightline correctly with what's staying on an older home
What a Correct Custom Window Job Involves
Measuring and Ordering
Custom work starts with precise field measurement, not a catalog lookup. We measure the actual opening, note any out-of-square or out-of-level conditions common in older Sandy Point cottages, 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 — a custom window generally takes longer to arrive than a stock size, and we'd rather say so upfront than surprise you mid-project.
Working Within Tight Lot Lines
Close-set lots change how a job gets staged, not just how it's designed. Scaffolding, material staging, and equipment access all have to be planned around narrow side yards and neighboring structures, and window placement itself sometimes has to account for setback or clearance requirements that a wider inland lot would never run into. We walk this through during the assessment so there are no surprises once the crew shows up to start work.
Flashing and Weatherproofing
This is the step that matters most given the exposure here. Every custom shape changes how flashing has to be sequenced — a wide picture-window sill needs to shed water outward rather than let it pool, a resized egress opening needs new flashing tied cleanly into the surrounding wall instead of patched around the old detail, and a corner grouping needs the two wall planes' flashing to tie together without a gap at the seam. We build the flashing plan around the specific opening and its exposure, not a generic template pulled from a manufacturer's installation sheet.
Finish and Trim Integration
Custom windows in this neighborhood often sit in visually prominent spots — a picture window facing open water, a corner grouping wrapping a living room — so the trim and finish work has to match the rest of the exterior cleanly. We plan that integration before the window arrives so the finished result reads as intentional rather than added on.
Practical Checklist Before You Order
- Confirm the opening was field-measured, not estimated from old plans or a rough guess
- Ask what the flashing plan looks like for your specific opening shape and exposure, not a generic answer
- If a room is being converted to year-round living space, confirm the new opening meets current egress requirements
- Get a realistic lead time in writing before committing to a schedule
- Ask how the crew plans to stage the job given a narrow or close-set lot
- Confirm what's covered under warranty — the window unit and the installation labor are often separate
Frame Materials for This Climate
Frame material matters even more on a custom unit, since a larger or more exposed window has more surface area for salt air and moisture to work against over time. We'll walk through the honest trade-offs for your specific opening rather than defaulting to whatever's fastest to install. In general, fiberglass and vinyl frames paired with corrosion-resistant hardware hold up to sustained coastal exposure with less ongoing upkeep than an all-wood exterior finish, which is why we lead with them on weather-facing custom installs at Sandy Point. Wood-clad interiors paired with a low-maintenance exterior cladding can still be the right call when the interior look matters and the exterior is properly protected — it's a trade-off worth discussing against your specific opening and budget, not a one-size answer.
Our Process, Start to Finish
- On-site assessment — we measure the opening, check square and level, and evaluate lot-line, structural, or flashing concerns specific to its exposure
- Honest recommendation — custom order, modified stock size, or opening reframe, explained with the reasoning behind it
- Ordering and lead time — a realistic timeline for the custom unit to arrive, since it isn't a same-week job
- Removal and opening prep — the old unit comes out carefully, and any hidden framing 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 exposure
- Trim and finish — exterior trim is integrated to match the surrounding siding and architecture
Costs and Trade-Offs: Custom vs. Stock
| Factor | Stock Window | Custom Window |
|---|---|---|
| Lead time | Often available relatively quickly from local stock | Built to order — expect weeks, not days, depending on complexity |
| Fit | Standard sizes only; reframing needed if the opening doesn't match | Matched to the exact opening, lot constraints, or design intent |
| Flashing complexity | Straightforward, well-documented rectangular details | Shape- and exposure-specific — resized openings, wide sills, or corner groupings each need their own plan |
| Egress compliance | Only works if the existing rough opening already meets code | Can be sized to meet current egress requirements when a room's use changes |
| Cost | Lower, especially for common sizes | Higher, reflecting manufacturing and labor complexity |
| Best fit | Simple replacements in standard, already-correct openings | Older cottages, egress conversions, corner lots, or view-driven design |
What actually moves price on a custom job here is fairly consistent: overall size and glass area, shape complexity, whether the opening needs to be resized or reframed, frame material, the condition of the existing wall assembly, and how tight the lot is to work around. We won't quote a number without seeing the opening in person, but we'll walk through which of those factors apply to your project before you commit to anything.
Why a Local Sandy Point Crew Matters
Manufacturer installation guidance is written for average, standard-size conditions in a moderate climate. Custom windows at Sandy Point rarely fit that description, and neither does the exposure here — salt air, wind working around a house from more than one direction, and a long wet season stack the deck against a shortcut installation more than they would somewhere more sheltered. A crew that has actually resized openings for egress conversions, flashed corner window groupings, and worked within tight lot lines on this specific spit knows which parts of 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 don't come up in a sales conversation — how a picture window's wide sill is detailed to shed water instead of holding it, how much lap a flashing course needs on a resized opening, when a sill calls for 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 drafts and soft trim in five.
What to Ask Before Hiring for Custom Window Work
- Ask to see examples of custom shapes or sizes they've actually installed, not just standard replacements
- Ask how they sequence flashing for a home exposed to wind and salt air from more than one direction
- Confirm current Washington contractor licensing and insurance
- Get a written scope of work and a realistic lead time before signing anything
- Ask how labor and the window unit are each covered under warranty
If you're weighing a custom window for an older Sandy Point cottage, converting a room for year-round use, or looking at a larger picture window to make the most of a two-sided water 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 at Sandy Point and throughout the Birch Bay area — use the form below to get a time on the schedule.