New construction is where flashing earns its keep.
When you're adding on, building an ADU, or opening up a wall, the window goes into a fresh rough opening, and that's the best chance you'll ever get to flash it right. We set new-construction (flange) windows into the opening, lap the house wrap and weather barrier in the correct order, and add sill pans and head flashing so the wall stays dry for the life of the home.
We coordinate with your builder or remodel schedule so the windows go in at the right stage, before siding and after the rough opening is framed and wrapped. You get a detailed line-item quote up front and a crew that knows the City of Bellingham and Whatcom County inspection points.
What it actually costs.
Our four-step process.
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Free site visit & quote
We look at the openings or plans, confirm sizes, and give you a detailed line-item quote.
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Order new-construction units
Flange windows are ordered to the rough-opening sizes, with a short lead time.
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Set and integrate flashing
We set each window plumb and lap the sill pan, jamb flashing, and head flashing into the weather barrier in the right order.
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Inspection & final walkthrough
We hit the inspection points and walk the work with you before siding goes on.
Why hire pros for this.
- New-construction flange units set into fresh rough openings
- Sill pans and head flashing integrated with the house wrap
- Coordinated with your build or remodel schedule
- Right-sized for egress and tempered-glass code where it applies
- Detailed line-item quote and a permit-aware crew
Frequently asked questions.
How much does new window installation cost for an addition or ADU in Bellingham?
New-construction window installation runs about $700 to $1,600 per window installed in Bellingham, depending on size, style, and access. Specialty shapes and large units cost more. We quote off your sizes or plans for free.
When in the build should the windows go in?
After the rough opening is framed and the house is wrapped, and before siding. That sequence lets us lap the flashing into the weather barrier the right way so the wall drains. We coordinate the timing with your builder.
Do new windows in a bedroom addition need to meet egress?
Yes. Any new bedroom needs at least one window sized for emergency egress, and glass near doors or in wet areas usually needs to be tempered. We size the opening and the unit to meet Bellingham and Whatcom County code.