Who normally installs windows on a new-construction project — the builder, the window supplier, or a separate crew?

It varies by project. Some general contractors handle window install with their own framing crew, while others bring in a dedicated window contractor to make sure the flashing and sealing details are done correctly. We work both ways — as the installer on the builder's schedule, or coordinating directly with a homeowner's framer on an addition or remodel.

What should I ask a window contractor before hiring them for a new build in Redmond?

Ask specifically how they handle sill pan flashing and WRB integration, since that's where most long-term water problems start on new construction. Also ask about lead times for special-order windows, who's responsible if a rough opening isn't framed correctly, and whether they document the flashing work before it gets covered by siding.

Can I choose my own window brand, or do you install specific manufacturers only?

We work with several manufacturers rather than pushing one brand, because the right choice depends on your budget, the home's design, and the performance specs your builder or architect has set. If your plans already call out a specific product line, we're glad to work with what's specified.

What's the real difference between a nailing-fin window and a block-frame window?

A nailing-fin (or nail-fin) window has a flange around the frame that fastens directly to the wall sheathing and integrates with the house wrap and flashing — this is the standard type for new construction. A block-frame window has no flange and is designed to sit inside a finished opening, which is more typical of replacement work or masonry construction.

Does the City of Redmond have specific requirements for new-construction windows?

New windows on a Redmond build fall under Washington's statewide energy code, which sets minimum performance standards, plus local building permit review that covers things like egress sizing for bedroom windows and tempered glass near doors or low to the floor. Your builder's plans should already reflect these, and part of our job is making sure the windows we install match what's on file with the permit.

Redmond New-Construction Windows Installation

New-Construction Windows for Redmond Homes

New-construction windows are a different job from swapping out an old window in an existing wall. On a new build, an addition, or a full gut-and-frame remodel, the window goes into a rough opening that has never had glass in it before — which means the entire weather-sealing system, not just the window itself, gets built from scratch. In Redmond, where the building season runs through long stretches of wet weather, getting that sequence right the first time matters more than almost anything else in the exterior envelope.

This page is specifically about new-construction window installation — for builders, remodelers, and homeowners in Redmond working on ground-up construction, room additions, or reframed openings. If you're looking to replace existing windows in a home that's already built, that's a different scope of work with different techniques.

Why New-Construction Windows Are a Different Job

A new-construction window typically has a nailing flange (also called a nail fin) around the perimeter of the frame. That flange gets integrated directly into the weather-resistive barrier (WRB) and flashing system of the wall before siding ever goes on. Get that layering wrong — flashing tucked behind the WRB instead of over it, fasteners in the wrong spot, no sill pan under the rough opening — and you don't find out until water starts showing up inside a wall cavity years later, usually as rot, not as a leak you can see.

Replacement windows, by contrast, go into an opening that already has siding and trim around it, so the install leans more on sealants and existing flashing. New construction gives us the chance to do it right from the studs out, which is exactly why the sequence and detailing matter so much here.

What a Correct Install Actually Involves

Rough opening checked for square, level, and correct dimensions before the window ever shows up
Sloped sill pan flashing installed at the base of the opening so any water that does get past the window drains back out, not into the framing
WRB and flashing tape integrated in the correct shingle-lap order — each layer overlapping the one below it, working top to bottom
Nailing flange fastened per the manufacturer's schedule, not just "enough nails to hold it"
Backer rod and sealant at the interior air seal, separate from the exterior water seal — these are two different jobs, not one bead of caulk
Shims set correctly so the frame isn't under stress, which affects how the sashes operate for the life of the window

What Redmond's Climate Asks of a New Window Install

Redmond sits inland on the Eastside, but it's still squarely inside the marine climate that defines King County — long stretches of driving rain, overcast humidity that lingers for weeks, and a moss and algae season that starts as soon as things cool off in the fall and doesn't really let up until late spring. None of that is unique to waterfront property; it affects any wall assembly that isn't detailed correctly, whether the house is a mile from a lake or tucked into a wooded lot.

A few things we account for on Redmond builds specifically:

Tree cover and shaded lots. A lot of Redmond neighborhoods carry mature tree canopy, which keeps siding and window trim damp longer after a storm than a house in full sun. That extra dry-time window matters for how quickly moss and mildew can take hold around window perimeters, so flashing details that shed water cleanly are worth the extra care.
Long wet-season builds. If framing and window install land during the rainy months, the rough openings can sit exposed to weather for days or weeks before the WRB and windows go in. We plan sequencing to minimize that exposure and use temporary protection when a build schedule forces windows to wait.
Condensation from tight, efficient homes. Newer Redmond construction is built tighter for energy code, which is good for heating bills but means interior humidity has fewer places to escape. Correct window selection and installation — including the interior air seal — helps prevent condensation on glass and frames during our cold, damp mornings.

Choosing the Right Window for a Redmond Build

Frame material is a real decision on new construction, not just an aesthetic one — it affects how the window performs against our climate over decades, not just years.

Frame Material	How It Handles PNW Weather	Trade-offs to Know
Vinyl	Good moisture resistance, no painting needed, solid energy performance at a moderate price	Larger sightlines than fiberglass; can't be field-painted a different color as easily
Fiberglass	Very stable through our temperature and humidity swings, holds paint well, slim sightlines	Higher upfront cost than vinyl
Wood-clad	Warm interior look, good performance when detailed correctly	Exterior cladding and joints need careful flashing and periodic inspection — more maintenance sensitivity in a wet climate
Aluminum	Strong and slim, common in modern/commercial-style designs	Poor thermal performance unless thermally broken, which adds cost

We're honest about trade-offs rather than pushing one product line. For most Redmond houses, vinyl or fiberglass covers the performance and budget most homeowners are after; wood-clad shows up more on higher-end or architecturally specific builds where the look is the priority and the owner understands the maintenance commitment.

Performance Numbers Worth Understanding

Washington's energy code sets minimum performance requirements for new-construction glazing, generally in the range of U-0.30 or tighter depending on the compliance path the builder is using, plus solar heat gain (SHGC) targets that vary by orientation and shading. Your builder or architect will usually have already specified these based on the whole-house energy plan — our job is to make sure the windows we supply and install actually meet what's on that plan and what the Redmond building department will sign off on at inspection.

How the Process Works

Plan review. We look at the window schedule from the builder or architect — sizes, egress requirements for bedrooms, tempered glass locations near doors and low sills, and performance specs.
Ordering and lead time. New-construction windows are typically special-order to size, so we build lead time into the schedule and coordinate delivery to match the framing timeline.
Rough opening check. Before install day, we verify openings are square, correctly sized, and properly braced — catching framing issues here is far cheaper than after windows are set.
Flashing and sill pan. Sill pans and WRB integration go in before the window does, following manufacturer instructions and current building science practice for our climate.
Window set and fasten. Units are shimmed square and plumb, fastened per spec, and checked for smooth sash operation before we move on.
Seal and document. Exterior water seal, interior air seal, and photo documentation of the flashing layers — useful for the builder's records and for the homeowner down the line.

Working With Builders and General Contractors

On new construction, we're usually one crew inside a bigger schedule run by a GC — framers ahead of us, siding and trim crews behind us. We show up ready to hit the window slot in that schedule, communicate directly with the GC on any framing corrections needed, and don't hold up downstream trades. If you're a homeowner managing your own build or acting as owner-builder, we can work directly with your framer and coordinate the sequencing ourselves.

We also do this work on additions and major remodels where new openings are being framed into an existing house — a sunroom, a bump-out, a second story addition. The same new-construction detailing applies there, even though the rest of the house is decades old.

Why a Crew That Already Works Redmond Matters

New-construction window work depends on getting a lot of small sequencing details right, in the right order, on a schedule that isn't fully in your control. A crew that regularly works Redmond builds already understands the local permitting expectations, has a working relationship with area inspectors and GCs, and has seen how the local mix of rain, shaded lots, and tight modern construction actually plays out on a wall assembly — not just in a manufacturer's install guide. That experience shows up as fewer surprises: openings that pass inspection the first time, flashing that holds up through the first wet winter, and a schedule that doesn't slip because of avoidable rework.

Questions Worth Asking Any Window Contractor Before You Hire

Do you install a sloped sill pan on every new-construction opening, or only when asked?
How do you sequence flashing relative to the WRB — over or under, top to bottom?
Who is responsible if a rough opening isn't square or correctly sized when windows arrive?
What's your lead time for special-order sizes, and how does that fit the build schedule?
Do you document flashing details with photos before siding covers them up?
What warranty applies to the installation itself, separate from the manufacturer's product warranty?

Get an Estimate for Your Redmond Project

Whether you're framing a new home, adding a room, or working through a window schedule with your GC, we're glad to take a look at your plans and give you a straightforward, no-pressure estimate on the windows and installation for your Redmond project. Use the form below to get started.