What makes an egress window on a walkout-basement lot different from a standard basement window replacement?

An egress window has to meet minimum code requirements for opening size, sill height, and clear glass area so it can serve as a legal exit from a bedroom-level space, which a standard basement window isn't built to satisfy. On a sloped Samish lot, the rough opening is also often grade-dependent, so the unit usually has to be custom-fitted rather than pulled from stock.

What should I ask a contractor before hiring them for custom window work on a hillside or sloped lot?

Ask specifically how they handle drainage and flashing around a below-grade or near-grade opening, not just their general installation process, since that's where sloped-lot projects most often go wrong. Also confirm their Washington contractor license and liability insurance are current, and ask for a written, realistic lead time before you commit to ordering.

Does the window brand matter as much as the installation on a custom project?

Reputable manufacturers all produce solid frames and glass, and the bigger factor in long-term performance is almost always the flashing and structural detailing around a custom opening rather than the brand name. We'll recommend brands with a track record of reliable custom sizing and lead times rather than pushing one product for every job.

What's the practical difference between a bay window and a bow window?

A bay window typically projects out in three angled sections with a wider center pane, while a bow window uses four or more panes curved in a gentler arc, and both require their own roof and support system separate from the main wall. The right choice usually comes down to the interior space you want and how the shape fits the existing roofline, which is worth discussing during an on-site assessment.

Does Samish's hillside, tree-covered setting change what custom windows need to hold up to compared to a more open part of Whatcom County?

Yes — shaded, sloped lots hold moisture longer after a storm and support a longer moss season than open, sun-exposed properties, which puts extra demand on sill drainage and flashing at every custom opening. It doesn't change what's possible with a custom window, but it does mean the installation details need to be right the first time, since a shaded wall doesn't get much of a dry stretch to reveal a mistake before it becomes a problem.

Custom Windows in Samish, WA — A Whatcom County Hillside Fit

Custom Windows in Samish: What This Whatcom County Neighborhood Puts a Window Job Through

"Custom window" covers more ground than most homeowners expect: anything that isn't a stock size or standard shape pulled straight off a manufacturer's shelf. In Samish, that's a common situation rather than an exception. Between older homes built on grade before modern window standards existed, newer construction tucked into sloped, wooded lots, and additions that create openings nothing in a catalog quite matches, custom sizing and shapes come up on a large share of the window projects we see in this part of Whatcom County. Each of those situations carries its own fit challenge, and in this climate, its own weatherproofing challenge on top of it.

This page covers custom window work specifically for Samish — why homes here end up needing it more often than a typical stock replacement, what a correct custom install actually involves, and how our process works from first measurement to final trim.

Why Samish Homes Often Need Custom Windows

A few things about this neighborhood push window projects out of stock-size territory more often than they would in a flatter, more uniform part of the county.

Sloped Lots and Daylight Basement Openings

A lot of Samish sits on hillside terrain, and homes built into a slope often have daylight or walkout basement levels with window openings sized and positioned by the grade of the lot rather than a standard framing pattern. When one of those openings needs to be replaced or a basement space gets finished into living area, the window frequently has to meet egress code minimums for a bedroom-legal room, and the existing rough opening doesn't always line up with a stock unit that satisfies both the code requirement and the available wall space. That combination — grade-driven opening size plus code-driven minimum dimensions — is a common trigger for custom work here that a flatter lot wouldn't produce.

A Mix of Home Ages and Frame Sizes

Samish has a genuine mix of housing stock — older homes built to whatever dimensions made sense decades ago, alongside newer construction and additions built to current standards. A straight swap on an older home's opening often means either a custom-sized unit or reframing the wall, and reframing brings its own cost and disruption that most homeowners want to avoid if a custom unit can solve the problem instead.

Windows Built to Take Advantage of the View

Wooded, elevated lots in this part of Whatcom County are often positioned to take advantage of territorial or valley views, and that frequently shows up as a larger picture window, a bay window, or an oversized living-room opening that was never going to be a stock size to begin with. We see this on both older homes that were built with the view in mind originally and on renovations where a homeowner is opening up a wall to get more of it.

The Climate Factor Custom Windows Can't Ignore

Whatever the reason a custom window is going in, it has to hold up to the same conditions every other opening in this part of Whatcom County deals with: salt-tinged marine air moving through the region, wind-driven rain that hits walls at an angle instead of falling straight down, and a moss season that can run most of the year on shaded, north-facing surfaces under Samish's tree cover.

Salt Air and Hardware

Salt-influenced air accelerates corrosion on hardware, fasteners, and lower-grade flashing metal over time, and it doesn't spare inland or elevated properties the way people sometimes assume. Specifying corrosion-resistant fasteners and flashing on a custom install matters as much here as it does closer to open water.

Wind-Driven Rain and Sill Drainage

Rain in this region rarely falls straight down. It gets pushed sideways into window openings, which is exactly the condition a larger custom opening is most exposed to — more surface area and more perimeter means more places for wind-driven water to find a gap in the flashing.

Moss, Shade, and Tree Cover

Samish's wooded lots and hillside tree cover keep a lot of walls shaded and slow to dry out after a storm, which supports moss and mildew growth and keeps moisture sitting against sills and trim longer than it would on an open, sun-exposed lot. That's a slow, patient kind of stress, but it adds up over years at exactly the transition points a custom window depends on to stay sealed.

Where the Risk Actually Lives

On a custom unit, it's rarely the glass or the frame material that fails first. It's the transition points — where a bay window's roof meets the main wall, where a wide picture-window sill meets the siding below it, where an egress opening cut into a foundation wall meets the framing above it. Those spots need extra flashing attention, and they're also the spots a rushed install is most likely to shortcut, because they take real time to do correctly.

Custom Window Types We Build For

"Custom" changes meaning depending on what's actually being built or replaced. In Samish, the projects we see most often fall into a few categories.

Egress and code-driven basement windows — sized to meet bedroom-legal minimums on daylight or walkout basement levels
Non-standard replacement sizes — matching an existing opening in an older home built before modern sizing standards
Bay and bow windows — projecting units that add interior space and light but need their own roof, support, and flashing system
Picture and large-format windows — fixed units built to maximize a view, with more glass area to manage structurally
Matched sets for additions — new windows that need to sightline correctly with existing windows elsewhere on the house
Angled or split-level transitions — openings that follow a stepped foundation or multi-level floor plan rather than a single flat wall

What a Correct Custom Window Job Involves

Measuring and Ordering

Custom work starts with precise field measurement, not a catalog lookup or a guess from old plans. We measure the actual opening, note any out-of-square or out-of-level conditions common in older Samish homes, and account for the grade and slope around the opening where that's a factor. Because custom units are built to order, this step also sets expectations on lead time — we'll give you a realistic timeline before you commit rather than a best-case guess.

Opening Prep and Structural Considerations

Larger custom units, and openings cut into a foundation or basement wall for egress, sometimes need structural support or a header check beyond what a standard window opening requires. We evaluate that as part of the assessment, not as a surprise mid-project, and on sloped lots we look at how water drains around the finished opening as much as how the window itself performs.

Flashing and Weatherproofing

This is the step that matters most in Samish'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 below it, a wide picture-window sill needs to shed water outward rather than pooling, and a basement egress opening needs flashing and drainage detailing suited to below-grade or near-grade conditions rather than a standard wall opening. We build the flashing plan around the specific opening, not a generic template.

Finish and Trim Integration

Custom windows often sit in visually prominent spots — a picture window facing the view, a bay window anchoring a living room — so 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 looks intentional rather than added on.

A Quick Checklist Before You Order

Confirm the opening has been field-measured, not estimated from old plans or a rough guess
Ask what the flashing plan looks like for the specific shape or grade condition involved
Get a realistic lead time in writing before you commit to a schedule
If it's a basement or below-grade opening, confirm it meets current egress code minimums
Ask whether the opening needs structural review, especially for bay units or foundation cuts
Confirm what's covered under warranty — the window unit and the installation labor are often separate

Our Process, Start to Finish

On-site assessment — we measure the opening, check square and level, and evaluate slope, grade, or structural concerns specific to the site
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's not a same-week job
Removal and opening prep — the old unit comes out carefully, and any hidden issues with the existing opening 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 grade condition
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 quickly from local stock	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, grade condition, or design intent
Flashing complexity	Straightforward, well-documented rectangular details	Shape- and grade-specific — bay roofs, egress cuts, or wide sills each need their own plan
Structural review	Rarely needed for a like-for-like swap	Often needed for bay units, egress cuts, or oversized openings
Cost	Lower, especially for common sizes	Higher — reflects manufacturing and labor complexity
Best fit	Simple replacements in standard, above-grade openings	Older homes, sloped lots, egress needs, additions, or view-driven designs

We won't quote a number without seeing the opening, but the factors that move price on custom work are consistent: size and glass area, shape complexity, whether structural work is needed, frame material, the condition of the existing opening once it's opened up, and how many units are involved in the project. A matched set for an addition typically has better per-unit economics than a single one-off window.

Frame Materials for This Climate

Frame material matters even more on a custom unit, since a larger or more exposed opening has more surface area for salt air and moisture to work against over time. In general, fiberglass and vinyl frames hold up to sustained regional moisture with less ongoing maintenance than an all-wood exterior finish, which is why we lead with them on weather-facing custom installs. Wood-clad interiors with a protected exterior cladding can still be the right call when the interior look matters and the exterior is properly detailed — we'll walk through the honest trade-offs for your specific opening rather than defaulting to whichever product is easiest to install.

Why Hiring a Crew That Already Works Samish Matters

Manufacturer installation guides are written for average, standard-size conditions on a flat, above-grade wall. A lot of the custom work in Samish doesn't match that description — sloped lots, mixed-age homes, and egress openings cut into foundation walls all fall outside the guide's assumptions, and the climate here doesn't cut anyone a break for it either. A crew that has actually built out bay windows, sized egress units for a walkout basement, and flashed openings on a graded hillside lot in this part of Whatcom County knows which details in the manufacturer's guidance are non-negotiable here and where extra time on flashing or drainage is worth it even when it's not strictly required elsewhere.

That experience shows up in decisions that don't make it into a sales conversation — how a below-grade opening's flashing ties into the foundation waterproofing, how much lap a flashing course needs on a hillside wall exposed to driving rain, when a sill needs a sloped composite cap instead of relying on caulk. Those are the details that decide whether a custom window is still performing cleanly in fifteen years or showing rot and drafts in five.

If you're planning an addition, finishing a basement level that needs code-compliant egress windows, or considering a bay or picture window to make the most of a view, it's worth having someone look at the specific opening before you start pricing units. We offer free, no-pressure estimates for custom window projects in Samish and the surrounding Whatcom County area — use the form below to get a time on the schedule.