New-Construction Windows Built for Point Roberts
Point Roberts sits in a strange spot on the map — part of Whatcom County, Washington, but physically cut off from the rest of the U.S. mainland by the Canadian border. That geography shapes almost everything about building here, including how windows get installed in a new home or addition. New-construction windows aren't the same job as replacing a window in an existing wall. They go in before the siding does, tied directly into the house wrap and framing, and if that sequence is done wrong, the mistake gets buried behind the exterior finish for years before it shows up as a stain, a soft spot, or a draft.
We install new-construction windows for builders and homeowners on the peninsula and understand what the site actually demands: salt-laden air off the water, driving rain that doesn't always fall straight down, and a damp season that runs longer here than it does even a few miles inland. Get the window right the first time and it should be one of the lowest-maintenance parts of the house for decades. Get it wrong and it's one of the most expensive things to fix.

The Climate Point Roberts Windows Have to Handle
Salt Air and Marine Exposure
Being surrounded on three sides by Boundary Bay and the Strait of Georgia means salt-laden moisture is a constant here, not an occasional storm event. Salt air accelerates corrosion on exposed metal — fasteners, hinges, cranks, and lesser-grade flashing all age faster near the water than they do a few miles inland. Windows and the hardware that hold them in need to be chosen and installed with that in mind, not treated the same as a build in a dry, inland location.
Wind-Driven Rain
Rain in this part of Washington rarely just falls straight down — it comes sideways off the water on a lot of the storms that matter. Wind-driven rain finds any gap in a window's flashing or sealant that a gentler rain would never reach. That's why the flashing detail around a new-construction window matters more here than it would in a sheltered, inland lot.
A Long Moss Season
The extended damp season that keeps moss thriving on roofs and north-facing siding here also means any water that gets past a window opening has more time each year to sit against wood framing before things dry out. A poorly flashed window doesn't announce itself right away — the damage builds quietly over one damp season after another.
What "New-Construction" Installation Actually Means
Nailing-Fin Windows and the Rough Opening
New-construction windows are built with a nailing fin (also called a flange) around the perimeter of the frame. That fin gets fastened directly to the wall sheathing before siding goes on, and it becomes part of the wall's drainage plane along with the house wrap and flashing tape. This is different from a replacement or "pocket" window, which slides into an existing frame from the outside and relies on the old frame and trim to manage water.
Why the Sequence Matters More Than the Window Itself
A quality window installed out of sequence with the house wrap will leak eventually. A mid-grade window installed in the correct shingle-lap sequence, with proper sill pan flashing, will usually outperform it. New-construction installation is as much about the order of operations — wrap, pan, window, tape, siding — as it is about the product itself.
The Flashing Sequence That Keeps Water Out
This is the part of a new-construction window install that decides whether it performs for thirty years or becomes a hidden problem in five. Every layer has to shed water down and out, the same way roof shingles overlap so nothing runs uphill into a seam.
- Sloped sill pan flashing installed at the rough opening, with end dams to keep water from running out the sides onto the wall sheathing
- Flexible self-adhered flashing tape at both jambs, lapped over the sill pan
- Window set, shimmed level and square, and fastened per the manufacturer's schedule — not overdriven, which can bow the frame and cause the sash to bind
- Head flashing or a drip cap installed above the window, lapped under the house wrap above it
- House wrap integrated in shingle-lap order so every layer drains onto the one below it, never the reverse
- Backer rod and appropriate sealant at the interior air seal, separate from the exterior water management layer
Skipping the sill pan or reversing the lap order is the single most common cause of window-related rot we see opened up in walls — and it's invisible from the outside until the damage is already done.
Frame Material Choices for a Salt-Air Coastal Site
Every frame material has trade-offs. On a site with regular salt air and sideways rain, the maintenance burden of each option matters more than it would inland.
| Frame Material | Salt-Air Performance | Maintenance | General Cost Range |
|---|---|---|---|
| Vinyl | Good — won't corrode or pit | Low; occasional cleaning | Lower |
| Fiberglass | Very good — stable and corrosion-proof | Low | Mid to upper |
| Aluminum-clad wood | Good on the exterior face if cladding is intact; interior wood needs protection from condensation | Moderate | Upper |
| Bare aluminum | Weakest here; prone to pitting and corrosion near salt air over time | Higher | Lower to mid |
Hardware matters as much as the frame. We spec stainless steel or marine-rated fasteners and hinges on exposed elevations rather than standard-grade hardware, since that's usually the first thing to show wear in a salt-air environment.
Design Pressure and Wind Exposure
Windows carry a Design Pressure (DP) rating that reflects how much wind load and water infiltration they're built to resist. A lot on open water or facing prevailing wind deserves a higher DP-rated window than a sheltered, tree-lined lot a few blocks inland. This isn't a place to guess — it's worth matching the window's rating to the specific exposure of that wall, not just using whatever rating is standard for the builder's typical spec.
Our Process for New-Construction Window Installs Here
Before the Windows Arrive
We coordinate with the builder or homeowner on rough opening sizes and timing well before the windows are ordered, since lead times can run several weeks and a wrong opening dimension is expensive to correct after the fact. Because of Point Roberts' location, we also plan material delivery and crew scheduling around the border crossing rather than assuming next-day availability the way a mainland job might.
Install Day
Windows go in after the house wrap is on and before siding starts, following the flashing sequence above on every opening — not just the ones facing the water. We check each unit for level, plumb, and square, and confirm operation (sashes open and close cleanly, locks engage) before moving on to the next opening.
Before We Leave the Site
We walk every opening with the builder or homeowner, confirm flashing and fastening on each unit, and document that the sequence was followed correctly — useful for the builder's own records and for any future warranty question.
Why a Crew That Already Works Point Roberts Matters
Point Roberts isn't like a typical Whatcom County job site. Getting a crew, tools, and materials to the peninsula means routing through Canada, which adds scheduling considerations that a lot of mainland-based contractors simply aren't set up to handle well — and some avoid the peninsula altogether because of it. A crew that regularly works here has already solved that logistics problem, knows realistic lead times for material delivery, and isn't learning the border-crossing routine on your project's schedule.
There's also the exposure question. A contractor who mostly builds in sheltered, inland neighborhoods may not default to marine-grade fasteners or a higher DP rating unless asked. A crew that works Point Roberts regularly treats that as the standard spec, not an upgrade.
Questions Worth Asking Any Contractor Before You Hire
- Have you installed new-construction windows on Point Roberts or similar waterfront sites before?
- What fastener and hardware grade do you use on exposed, salt-air elevations?
- Can you walk me through your flashing sequence at the sill, jambs, and head?
- How do you account for border-crossing logistics in your delivery and crew scheduling?
- What DP rating are you specifying for this lot's wind exposure?
What Drives Cost on a New-Construction Window Job
New-construction window costs are driven more by the specification than by labor alone. The factors below are what typically move a bid up or down, in rough order of impact.
| Factor | Why It Matters |
|---|---|
| Number and size of openings | More openings and larger units mean more material and install time |
| Frame material | Vinyl runs lower; fiberglass and clad-wood run higher, as shown above |
| DP rating / impact requirements | Higher-rated units for exposed elevations cost more than standard-rated units |
| Site access and delivery logistics | Border crossing and site access can affect scheduling and delivery cost |
| Coordination timing with the builder | Installing on schedule with framing avoids delay costs and re-sequencing |
We don't quote a job without seeing the plans or the framed openings — window pricing varies too much by size, glazing, and grade to give a meaningful number sight unseen.
Get a Straight Answer on Your Project
Whether you're a builder working through a new-construction spec or a homeowner planning a build on the peninsula, we're glad to look at your plans, talk through the right window spec for your specific lot's exposure, and give you a clear, no-pressure estimate. Fill out the form below and we'll get back to you.
Blaine Siding