ServicesWindow Replacement
Window Replacement in Mountlake Terrace
We replace tired, drafty or fogged windows with new units built to fit each opening. Floors are covered, plantings are protected and you know which rooms we are working in before we start. Most installs are finished in a single day.

When replacing the window is the right answer
Replacement makes sense when the frame or the sealed glass unit has failed, not just a latch, a balance or a strip of weatherstripping. If a single part is the problem, window repair may serve you better, and we will say so during the consultation.
Many homes around here date from the 1950s through the 1970s and still have aluminum sliders or early double-pane units. Aluminum carries cold straight through the frame, so it sweats on winter mornings and leaves water on the sill. A new vinyl, fiberglass or wood-clad window with low-E glass keeps the inside pane warmer and the sill dry.
Inside, we lay runners along the path we walk and drop cloths under each opening. Outside, we cover the beds and shrubs below the windows. Someone on the crew checks in with you before we move from room to room, so nobody is surprised by an open wall in the middle of the afternoon.

What the work includes
- 01
Measuring every opening
Older houses settle, so openings that look identical rarely are. We measure each one in three places for width and height and note anything out of square before a window is ordered.
- 02
Removal and haul-away
We take out the old sashes, frames and glass and take them with us. Broken glass never goes in your trash.
- 03
Insert or full-frame installation
An insert fits inside a sound existing frame and leaves your interior trim in place. A full-frame install goes back to the rough opening, which lets us replace rotted wood and correct the flashing.
- 04
Flashing and sealing
Each window is set level, shimmed, insulated with low-expansion foam and sealed on the outside so rain runs away from the opening instead of behind it.
- 05
Trim and finish
We fit interior stops or casing and exterior trim so the new window looks finished from both sides, with clean caulk lines and no gaps.
Questions about Window Replacement?
Call(425) 600-7934When your windows are telling you it's time
Haze trapped inside the glass
A cloudy film you cannot reach from either side means the seal between the two panes has given out. No amount of cleaning clears it, and it tends to grow over time.
Wet sills and dark corners
Water that collects on the sill each cold morning can stain paint and feed mildew on the sill and the wall beneath it.
Drafts you can feel
On a breezy day, your hand near the frame should sense nothing. A steady cool stream points to worn seals or a frame that has moved.
Sashes that stick or fall
A window that won't stay up, takes two hands to slide or refuses to lock is a safety concern, not only an annoyance.
Soft or cracked frames
Push a screwdriver into a wood sill. If it sinks in, rot has taken hold and the frame will keep letting water through.
How a window replacement runs
- 1
Consultation at your home
We look at each window, measure, talk through frame materials and glass options, and point out any rot or water damage we find. You get a written quote with each window listed, and there is no pressure to decide that day.
- 2
Ordering
Your windows are built to the measurements we took. Once they arrive, we call to set an install date that suits your household.
- 3
Setting up on install day
We walk the job with you, agree on which rooms come first and cover floors, furniture and plantings before a single window comes out. Pets and children are easier to plan around when you know the order.
- 4
Installing one opening at a time
Each old window comes out and the new one goes in before we move on, so your home is never left open for long. Most installs are finished in a single day.
- 5
Cleanup and walkthrough
We vacuum, remove the coverings, pick up debris from the beds outside and open and lock every new window with you. Our 10-year workmanship warranty covers the installation itself.
What shapes the cost of new windows
We price your quote from the windows you actually have, never from a flat figure per house. Each opening gets its own line, so you can see where the money goes and decide where it is worth spending more. If paying all at once does not suit your budget, ask us about our flexible payment options during the consultation.
- How many openings, and how big
- A wide picture window or an oversized slider uses more material and needs an extra pair of hands to lift and set, so it prices higher than a typical bedroom window. The total count matters too, since setup is shared across every opening on the job.
- Frame material
- Vinyl is the most economical and asks little of you in upkeep. Fiberglass stays stable as temperatures swing, and wood-clad brings a warm interior finish at a higher price.
- Glass package
- Low-E coatings, argon fill and triple panes each change the number. Code calls for tempered glass beside doors, near tubs and close to the floor, which raises the cost of those particular openings.
- Condition of the opening
- A rotted sill or missing flashing points to a full-frame install and some carpentry. Before any added work goes on your quote, we show you photos of what we found.
- Access and permits
- Upper-floor windows above a deck or thick plantings take longer to set up safely. If your project needs a permit, we pull it and the cost is already in the quote.
Window replacement questions
How will you protect my floors and garden?
Runners go down from your door to each window, with drop cloths beneath every opening. Outside, we cover beds and shrubs and keep ladders clear of fragile plantings wherever we can. All of it is lifted and the area cleaned before we leave.
Do I have to do every window in the house at once?
Not at all. Many people start with the rooms that trouble them most, often the bedrooms or the wall that takes the brunt of the wind and rain. When the time comes for a second phase, we match the frame color and sightlines to the first set so the house still reads as one.
Should I choose an insert or a full-frame window?
When your existing frame is solid, square and dry, an insert costs less and keeps your trim. Rot, water staining or old aluminum framing usually make full-frame the better long-term choice. We show you what we see and walk you through the trade-off.
Who is responsible if something goes wrong during the work?
We are. Our company is licensed, insured and bonded, which covers the work on your home from the moment we arrive until we pack up. After the job, our 10-year workmanship warranty stands behind the installation.
Will my house be open to the weather all day?
No. We take out and set one opening at a time, so each room is exposed only briefly. If rain moves in, we cover the opening until the new window is set and sealed.

Talk through your windows with us
We will look at each window, answer your questions and leave you with a written quote to consider in your own time.