Slim-frame aluminum windows in a warm interior

Aluminum Windows · Seattle, Washington

Aluminum Windows in Seattle.

Thermally broken aluminum windows for Seattle builders and homeowners, glazed to hold interior surface temperatures above the dew point through a wet Pacific Northwest winter and sized generously for the daylight a gray climate is short on.

In short

Seattle's marine layer keeps humidity high most of the year, and warm room air meeting cold glass is exactly what causes the condensation that fogs a window and eventually rots the sill beneath it. Crateworks specs a thermally broken aluminum frame that keeps the interior glass surface warm enough to avoid that, factory-direct.

Built for Seattle’s climate

Seattle sits in IECC climate zone 4C, marine, where the defining condition is not extreme heat or cold but months of persistent rain and relative humidity that rarely drops. Condensation on the interior glass surface is the practical result, and where a window frame conducts cold straight through, that moisture collects at the sill and feeds rot and mold in the surrounding wood trim. A thermally broken aluminum frame keeps the interior surface warmer, which is the actual fix, not just a tighter seal. Low winter light is the second local fact worth designing around, larger glass area and slimmer sightlines pull more of the available daylight into a room during the months the sun barely clears the horizon. Local energy code sets minimum frame performance requirements for this zone, confirm the specific figure with your jurisdiction before ordering.

Climate zone
4C marine
Best time to spec
spring through fall
What we plan for
persistent rain, moisture, and mildew

Why it suits Seattle

A wood window looks right in a Craftsman bungalow in Ballard until a few wet seasons work into the joinery and the sill starts to soften. Aluminum does not absorb that moisture or swell, and the thermal break keeps performance where zone 4C code requires without needing the mass of a wood frame to do it. Going factory-direct is what puts triple-pane glazing, oversized panes, and slimmer frame profiles that maximize glass within reach, specced through /brief to the actual opening rather than a stock size.

Container-direct delivery into the Greater Seattle area.

How it ships to Seattle: Freight lands at the Seattle and Tacoma ports of the Northwest Seaport Alliance, in the metro itself.
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Explore the range

Aluminum Windows types

Slim-frame aluminum windows in a warm interior

Casement

Casement, sourced to your spec.

Slim-frame aluminum windows in a warm interior

Tilt & Turn

Tilt & Turn, sourced to your spec.

Slim-frame aluminum windows in a warm interior

Double-Hung

Double-Hung, sourced to your spec.

Slim-frame aluminum windows in a warm interior

Specialty Shapes

Specialty Shapes, sourced to your spec.

How it works

  1. 01

    Send your scope

    Drawings, a materials list, or a rough idea. No account, no obligation. Just tell us what the project needs.

  2. 02

    We source & spec

    We match products to your climate and local code, then price them factory-direct from vetted suppliers, not off a distributor's shelf.

  3. 03

    One delivered quote

    The whole schedule comes back as a single coordinated quote, delivered to Seattle. One order, one point of contact.

One source for the whole project

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Common questions

Persistent high humidity combined with a frame that conducts cold is what fogs the interior glass and eventually softens the sill. A thermally broken aluminum frame keeps the interior surface warmer, which cuts that condensation at the source.
Wood absorbs moisture over repeated wet seasons and can soften at the sill and joinery. Aluminum does not, and a polyamide thermal break holds the performance zone 4C code requires without that risk.
Yes. Panel size and sightline width are specced to your opening through /brief, which matters most in a climate short on direct winter light.
Exterior glazing installs go faster and cleaner in the drier stretch from spring through fall. Order over the winter so production and freight land before that window opens.

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Spec aluminum windows for Seattle.

Send drawings or a rough scope. We quote the Seattle delivered price, all-in.

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