How long does a custom window installation typically take?

A single custom window usually takes a few hours to install once it arrives, but the window itself often takes several weeks to manufacture after ordering because it's built to a specific opening rather than pulled from stock. Full-frame replacements with flashing repair take longer per window than straightforward inserts. We'll give you a realistic timeline once we've measured and diagnosed your specific openings.

What should I ask a contractor before hiring them for custom window work in Green Lake?

Ask how they handle flashing and sill pan detailing, since that's what actually determines whether the window leaks in a few years — not the window brand alone. Ask whether they pull permits when required, how they handle a discovery of hidden rot once the old window is removed, and whether they've worked on homes similar in age to yours in this neighborhood. A contractor who answers those questions specifically, rather than generically, has usually done the work before.

Do you install a specific window brand, or can you match what's already on my home?

We work with several manufacturers rather than locking every job into one brand, because custom sizing and architectural matching often point toward whichever manufacturer can build the exact configuration a home needs. We'll recommend a specific product once we know your opening sizes, budget, and the look you're trying to match, and explain why it's the right fit rather than just the one we happen to sell.

What's the real difference between double-pane and triple-pane windows for a Seattle home?

Triple-pane windows offer better insulation and sound dampening, which matters more on a busy street or a home with high heating costs, but they cost more and weigh more, which can matter for older framing. For most Green Lake homes, a quality double-pane window with a good low-E coating is enough to handle our climate, and triple-pane becomes worth the added cost mainly for homes with unusual noise or exposure issues. We'll talk through the trade-off honestly rather than upselling the more expensive option by default.

Does the City of Seattle require permits for window replacement?

In many cases yes, particularly when a replacement changes the size of an opening, affects an egress window, or the property falls under additional design review due to its age or location. Straightforward like-for-like replacements sometimes qualify for a simpler process, but requirements can vary by property. We handle the permitting question as part of the estimate so you know upfront what your specific project requires.

Custom Windows for Green Lake Homes

Custom Windows in Green Lake: Built for Seattle's Marine Climate

Green Lake is one of Seattle's most walkable, well-established neighborhoods, and its housing stock reflects that. You'll find older craftsman and bungalow-style homes from the early-to-mid 1900s standing next to newer infill construction, and both types of homes tend to run into the same problem when it's time to replace windows: standard off-the-shelf sizes don't always fit what's actually in the wall. Openings settle, older framing was often built to dimensions that predate modern manufacturing standards, and architectural details like grille patterns, arched tops, or bay configurations don't come in a stock size. That's where custom windows come in — built to the exact opening and style of the home, rather than forcing the home to accommodate whatever size happens to be on the shelf.

Seattle Exterior installs custom windows for homes throughout Green Lake and the rest of King County, and we also handle siding, roofing, and decks — because a window is never really an isolated product. It's one component of the wall assembly, and it has to work with the siding, flashing, and framing around it or it becomes the weak point in an otherwise solid house. In a neighborhood like Green Lake, sitting within Seattle's marine-influenced weather system, that means every custom window has to be built and installed to handle salt-tinged air moving in off Puget Sound, driving rain, and a moss season that runs longer here than in drier parts of the country.

What This Climate Does to Windows Over Time

Salt-Tinged Air and Hardware Corrosion

Seattle sits close enough to Puget Sound that marine air carries a steady, low-grade salt content across most of the city, Green Lake included. It's not the direct salt spray you'd get on a waterfront property, but it's a persistent, cumulative load on window hardware, screen frames, and lower-grade fasteners over the years. Cheaper finishes tend to show pitting, stiffness in the locking hardware, or corrosion streaking on the frame first — usually a sign the original hardware wasn't specified for this region's air.

Driving Rain and Flashing Failures

Rain here rarely falls straight down. Wind pushes it sideways into window flashing, head trim, and the sill pan beneath the frame, and that sideways load is a much tougher test of the installation than of the window product itself. A quality window installed with sloppy flashing will leak eventually; a modest window installed with a correctly pitched sill pan and properly lapped flashing usually won't. In our experience, the large majority of water damage found around windows traces back to an installation detail — not a failure of the window itself.

Moss, Mildew, and a Long Wet Season

King County's extended damp season gives moss and mildew a lot of time to work on any surface that stays shaded or doesn't drain well. On windows, that shows up as mildew staining on sills and lower sashes, and on wood-framed windows, slow rot at the corners and sill where water sits the longest. It's gradual — most homeowners don't notice until paint starts failing or the sill feels soft underfoot.

What "Custom" Actually Means for a Green Lake Home

"Custom" doesn't just mean expensive or decorative — it means the window is built to match something specific about your house rather than the nearest standard size. That comes up constantly in this neighborhood because of how many homes are older and how varied the architecture is. Common reasons a Green Lake homeowner ends up needing custom rather than stock windows:

Original openings that are non-standard sizes, common in homes built before modern manufacturing standardized dimensions
Architectural details worth preserving — divided-light grille patterns, arched tops, or bay and bow configurations
Matching a row of existing windows on the same wall so the new one doesn't stand out
Framing that has shifted or settled slightly over the decades, making a true stock fit unreliable
A desire to change a window's shape or size as part of a broader remodel, rather than a straight swap

We measure the actual opening, not a catalog number, and order or build to that. On homes where matching the existing architectural character matters, we'll talk through grille patterns, exterior color, and trim profile before anything is ordered — it's much easier to get that right up front than to notice a mismatch after installation.

Window Materials: What Actually Holds Up in This Climate

There's no single correct material for every home — budget, sun exposure, and how long you plan to stay in the house all factor into the decision. What matters is understanding the real trade-offs for a climate with this much sustained moisture before you commit.

Frame Material	Moisture & Corrosion Behavior	Typical Maintenance	Realistic Lifespan Here
Vinyl	Won't rot; seam and weld quality determines long-term water resistance	Low; occasional track and weep-hole cleaning	20-30 years
Fiberglass	Dimensionally stable, holds up well against corrosion and moisture	Low	30-40+ years
Wood, painted or clad	Best for matching older architectural detail, but vulnerable at joints and sills without upkeep	Higher; periodic paint or finish maintenance	15-30 years depending on upkeep
Aluminum	Conducts cold and can corrode over time in salt-influenced air unless well-finished	Moderate	20-30 years

For custom window work in Green Lake, wood-clad and fiberglass tend to come up most often — wood-clad because it matches the look of older craftsman details on the exterior while giving a low-maintenance finish, and fiberglass because it holds paint and color well over the long term without the upkeep wood demands. We'll walk through which one actually fits your home's exposure and the look you're after, rather than defaulting to whatever is easiest to sell.

Full-Frame Replacement vs. Insert Replacement

One of the first decisions on any window project, custom or not, is whether to do a full-frame replacement — removing the old window down to the rough opening and rebuilding the flashing from scratch — or an insert replacement, which fits a new window into the existing frame. Insert replacement is faster and less invasive to the surrounding siding and trim, and it works well when the existing frame is structurally sound and was properly flashed to begin with. Full-frame replacement costs more and takes longer, but it's the honest answer when there's already moisture damage at the sill or jambs, when you're changing the window's size or shape, or when the original flashing was never done correctly in the first place. We'll tell you which situation your home is actually in rather than defaulting to the cheaper option and sealing a moisture problem up behind a new window.

Our Process for a Custom Window Job

On-site assessment: We measure every opening by hand, check the condition of the existing framing and flashing, and note any architectural details worth matching.
Design and ordering: Frame material, grille pattern, color, and glass package are finalized before anything is ordered, since custom units take longer to build than stock sizes.
Careful removal: Old windows come out without unnecessary damage to surrounding siding or trim, and we inspect the opening for hidden rot or moisture damage once it's exposed.
Flashing and sill pan work: This is where most long-term water problems get prevented or created, so it's never rushed or treated as a formality.
Installation and sealing: The new window is set, shimmed level and plumb, and sealed with the right materials for a home in a wet marine climate.
Interior and exterior finish: Trim is reinstalled or replaced to match, and the site is left clean.

Installation Fundamentals We Don't Treat as Optional

Most window failures in this climate aren't failures of the window itself — they're shortcuts in the flashing and sealing details that don't show up until a wet season or two later. On every custom window job, that means:

A properly pitched sill pan that sheds water outward instead of letting it pool under the frame
Head flashing integrated with the housewrap or building paper above the window, lapped correctly for water to shed downward and outward
Jamb flashing tied into the surrounding wall assembly rather than relying on caulk alone
Weep holes and drainage paths left clear and functional, not sealed shut during installation
Corrosion-resistant fasteners and hardware appropriate for a consistently damp, salt-influenced climate
Insulation and air sealing around the frame that doesn't trap moisture against the framing

Why a Crew That Already Works Green Lake Matters

Custom window work rewards local experience in ways a lot of other exterior projects don't. A crew that's worked on Green Lake homes before has a feel for the range of opening sizes and architectural styles common to the neighborhood, knows what to expect when an older wall gets opened up, and has already worked through the City of Seattle's permitting process for window changes — which can vary depending on the home's age, whether the work changes an opening's size, and whether the property falls under any additional design review. A contractor who's only seen a handful of Green Lake homes is learning those specifics on your job. A contractor who works the neighborhood regularly already knows them, which usually means fewer surprises and a smoother permit process from the start.

Get an Honest Look at Your Windows

If you're weighing whether your Green Lake home needs a few custom windows replaced or a full-house project, we're happy to take a look and give you a straightforward assessment — no pressure, no inflated urgency. Use the form below to request a free estimate, and we'll walk the property, measure what actually needs measuring, and tell you honestly what we'd recommend.