Birch Bay Siding Sandy Point sits right on the water on this stretch of the Whatcom County coastline, and that location shapes almost every window decision homeowners here end up making. Much of the neighborhood grew up as a beach community — smaller cottages built decades ago for weekend and summer use, many since insulated, expanded, or converted into full-time homes. Mixed in are newer builds designed around the water view. Neither situation lines up neatly with a manufacturer's standard window catalog, which is why "custom" comes up so often for homes in this community, not as a rare exception but as a routine part of doing the job right.
We treat custom window work as its own category, separate from a straightforward stock swap. The measuring, the flashing sequence, the lead time, and the installation order all change once a window stops being an off-the-shelf size or shape. In a beachfront neighborhood like Sandy Point, where salt air and wind-driven rain off the water are a constant rather than an occasional storm event, those details carry more weight than they would a few miles inland.
Why Sandy Point Homes Often Need Custom-Sized Windows
A few patterns repeat across this neighborhood. Older beach cottages were framed to whatever dimensions made sense at the time, long before window manufacturers standardized common sizes, so a true like-for-like replacement often means ordering custom rather than hoping a stock unit happens to fit. Additions built to expand a small original footprint create openings that don't match anything in a catalog. And homes oriented toward the water — whether an original cottage or new construction — frequently use picture windows or larger fixed units sized around the view rather than around what's convenient to stock.
None of that makes a project unusual for us. 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 and doesn't show up on a truck the same week you decide to move forward.
What the Marine Climate Does to Windows Here
Being directly on the water puts Sandy Point homes in a tougher environment than the general installation guidance most manufacturers write for. Salt-laden air speeds up corrosion on hardware, fasteners, and lower-grade frame components faster than it would at a drier, inland address. Storms off the water push rain sideways into wall assemblies and window flashing instead of letting gravity carry it straight down, which means water finds gaps that would never get tested somewhere more sheltered. And the shade and dampness common along this stretch of coast support a moss and mildew season that can run most of the year on north- and west-facing walls and trim.
Custom windows raise the stakes on all of that. A larger picture window has more glass area for wind load to work against. A wider sill has more surface for water to collect on if it isn't sloped and detailed correctly. A reframed opening has more transition points where a small gap in flashing can turn into a slow leak. None of this argues against custom windows — it means the installation has to plan for the added exposure instead of treating it like a routine stock swap.
Where Problems Actually Start
The glass and frame material are rarely the first thing to fail on a well-built custom unit. It's the transition points — where a wide sill meets the siding below it, where a reframed opening ties into the original wall assembly, where trim meets cladding on an addition. Those spots need extra flashing attention, and they're also the spots a rushed installation is most likely to shortcut, because doing them correctly takes real time on site.
Custom Window Situations We See Regularly in Sandy Point
- Non-standard replacement sizes — matching openings in older beach cottages that predate modern sizing standards
- Picture and large-format windows — fixed units used to maximize a water view, with more glass area to manage structurally and thermally
- Reframed or resized openings — where the existing rough opening needs correction before any new unit can be set cleanly
- Matched sets for additions — new windows sized to sightline correctly with existing openings on an older cottage
- Bay and bow windows — projecting units that add interior space, but bring their own roof, support, and flashing requirements
- Full-time conversion upgrades — replacing thin, single-purpose seasonal windows with units built for year-round exposure
What a Correct Custom Window Job Involves
Measuring and Ordering
Custom work starts with precise field measurement, not a catalog lookup or an old set of plans. We measure the actual opening, note any out-of-square or out-of-level conditions common in older Sandy Point cottages, and account for what the finished trim and flashing will need in terms of clearance. Because custom units are built to order, this is also where we set realistic expectations on lead time — custom windows generally take longer to arrive than stock sizes, and we'd rather say so upfront than let it surprise you mid-project.
Opening Prep and Structural Considerations
Larger custom units sometimes need structural support beyond what a standard opening requires, since more glass area means more weight and more wind load to carry. We evaluate that during the assessment, before any demolition starts. On older cottages in this neighborhood, this step is also frequently where we find out whether the original framing or flashing around an opening needs repair before a new window goes in.
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 sill needs to shed water outward instead of letting it pool, a resized opening needs new flashing tied cleanly into the surrounding wall rather than patched around the old detail, and a bay or bow unit needs its own weatherproofing separate from the wall flashing below it. We build the flashing plan around the specific opening rather than pulling a generic template off a manufacturer's installation sheet.
Finish and Trim Integration
Custom windows in Sandy Point often sit in visually prominent spots — a picture window facing the water, a matched set on a cottage addition — so the trim and finish work has to read as intentional, not tacked on. We plan that integration before the window arrives, so the exterior looks finished the day the job wraps, not weeks later.
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, not a generic answer
- Get a realistic lead time in writing before committing to a schedule
- Ask whether the opening needs structural review, especially for large picture or bay 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 surrounding siding
Frame Material Trade-Offs for a Waterfront Property
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 hold up to sustained coastal moisture 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 — that's a trade-off worth discussing against your specific opening and budget, not a one-size answer we hand out to everyone.
Stock Windows vs. Custom Windows
| Stock / Standard Size | Custom-Sized or Shaped | |
|---|---|---|
| Lead time | Often available relatively quickly | Built to order — weeks, not days, depending on complexity |
| Fit | Standard sizes only; reframing needed if the opening doesn't match | Matched to the exact opening or design intent |
| Flashing complexity | Straightforward, well-documented rectangular details | Shape-specific — wide sills, resized openings, or projecting units each need their own plan |
| Structural review | Rarely needed for a like-for-like swap | Often needed for large picture, bay, or bow units |
| Cost | Lower, especially for common sizes | Higher, reflecting manufacturing and labor complexity |
| Best fit | Simple replacements in standard, already-correct openings | Older cottages, additions, view-driven design, or non-standard framing |
What actually moves price on a custom job is fairly consistent: overall size and glass area, shape complexity, whether structural framing needs to be added or corrected, frame material, the condition of the existing opening, and how many units are being ordered together. 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.
Our Process, Start to Finish
- On-site assessment — we measure the opening, check square and level, and evaluate any structural or flashing concerns specific to its shape or size
- 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 size
- Trim and finish — exterior trim is integrated to match the surrounding siding and architecture
Why a Crew That Already Works Sandy Point Matters
Manufacturer installation guidance is written for average, standard-size conditions in a moderate climate. Custom windows at Sandy Point rarely match that description, and neither does the exposure here — salt air, wind-driven rain, and a long wet season stack the deck against a shortcut installation more than they would somewhere drier and more sheltered. A crew that has actually reframed odd-sized openings, flashed large view windows, and worked on beach cottages along this stretch of coast 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 much lap a flashing course needs on a resized opening, when a sill needs a sloped composite cap instead of relying on caulk alone, how a wide picture window's perimeter should be sequenced against the surrounding wall assembly. 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 your specific opening
- 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, planning an addition, or looking at a larger picture window to make the most of a 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 the surrounding Birch Bay area — use the form below to get a time on the schedule.