Bellingham Window Replacement: Windows, Patio Doors and Sealed Glass
Expert residential and commercial window services. Free measured quotes right across Whatcom County and northern Skagit, with a humidity reading included.
Registered, bonded and insured with Washington L and I·Humidity reading and fan check on every estimate·Written workmanship warranty on the installation·Free measured quotes across Whatcom and northern Skagit
Bellingham Window Replacement installs and repairs replacement windows, sliding patio doors, entry doors and insulated glass units throughout Bellingham and Whatcom County. We fit welded vinyl, pultruded fiberglass and clad-wood frames, set argon-filled sealed units with warm-edge spacers, rescreen what does not need replacing, and cut egress openings for daylight basements. We also replace failed sealed units on their own.
We also do something most window companies skip entirely. Before we price a single unit we take a relative humidity reading in two or three rooms, check that the bath fans move air and genuinely reach the outside, and open the crawl space hatch to see what is on the ground. In a marine climate that ten-minute check changes what we recommend.
Because it has to. A drafty old sash was ventilating your house whether you wanted it to or not, and a properly sealed replacement stops that on day one. If the moisture the building was already making has nowhere else to go, it lands on the coldest glass in the house, and the new windows get the blame. We would rather tell you first.
Our Window Services in Bellingham, WA
Energy-Efficient Windows and Air Sealing
Bellingham runs about 5,559 heating degree days a year, so nearly all the energy your house loses goes out as heat rather than in as sun. The number that decides your bill is whole-unit U-factor.
Welded Vinyl Replacement Windows
Vinyl is the correct answer for most houses in this market, and we will say so out loud even when a pricier frame is sitting open in the same brochure. In a mild marine climate its one genuine weakness, thermal movement, barely gets a chance to show up.
Pultruded Fiberglass Windows
Pultruded fiberglass costs real money, and in this climate the usual sales pitch for it does not apply. Nobody in Bellingham is buying fiberglass because their vinyl was about to warp.
Clad-Wood Windows and Interior Wood Trim
Clad-wood is the right product for a fair number of houses here, particularly in the older neighborhoods where a plain vinyl frame in a period opening looks like a mistake from the sidewalk. It is also the product most reliably destroyed by a humidity problem nobody diagnosed.
Aluminum Windows and 1970s Slider Swaps
A very large share of the houses between here and Sedro-Woolley went up between 1965 and 1985 with single-glazed aluminum sliders. Whatcom County's median home dates to 1988.
Double-Hung Windows That Vent From the Top
Almost every window article on the internet will tell you that a casement seals better than a double-hung, and that is entirely true. On this site we still recommend double-hungs for bedrooms in a great many Bellingham houses, and the reason is the top sash.
Casements, Awnings and Wet-Room Venting
Casements seal tighter than anything else you can buy. The sash pulls inward against compression weatherstrip, and the harder the wind pushes on it, the tighter that seal becomes.
Sliding Windows and Trickle Venting
Sliders have a poor reputation and most of it is earned. Two sashes riding on rollers past one another will never seal the way a casement does, and a worn slider leaks air continuously.
Bay and Bow Windows and Their Cold Seats
A bay or bow window is a small addition to your house that happens to be made mostly of glass. It has a floor, a roof and two or three walls, and every one of those surfaces is somewhere a builder can leave out insulation without anyone ever seeing it.
Picture Windows and Fixed Architectural Glass
A picture window is the tightest unit in any catalog, because it has no moving parts and nothing that has to seal against anything else. It is also the only unit you can never open.
Egress Windows for Daylight Basements
Bellingham is built on hills, so daylight basements are everywhere: Sehome, Columbia, the South Hill and most of the newer subdivisions out toward Barkley. Turning that lower floor into a legal bedroom means an egress opening, and there is no talking your way around the numbers.
Impact-Rated Laminated and Security Glass
Let us be straight about this page. Washington is not a hurricane-prone region under the building code, nowhere in Whatcom County is a debris zone, and nobody here is required to buy impact-rated glass.
Patio Sliding Doors and Sill Drainage
Your patio slider is almost certainly the biggest single pane in the house and the largest air path in the wall. Replace one and you change two things at once: the heat loss through that wall drops sharply, and so does the air moving through the room behind it.
French Doors and Astragal Sealing
French doors are the hardest opening in the house to keep sealed, and most people find that out in their second winter, not in the showroom. Two leaves meeting in the middle with no fixed frame between them is a joint that has to be manufactured, not one that exists.
Entry Doors, Thresholds and Sweeps
Before anything else on this page: if your existing door is fiberglass, the slab is straight and the frame is sound, you may not need a door. You may need a sweep, a threshold adjustment and new corner pads.
Window Screens as Ventilation Hardware
Most window companies treat screens as an accessory ticked at the end of the order. Here they are ventilation hardware, and we mean it literally.
Glass Repair and Failed Insulated Units
This is the page where we talk ourselves out of work, so let us get straight to it. If water is running down the inside of your windows and you can wipe it off with a towel, your seals have not failed and we will not sell you new glass.
Commercial Storefront and Taproom Glass
Commercial work here means downtown storefronts, the buildings along the waterfront, the industrial frontages out toward the airport, and a surprising number of taprooms and food businesses. Every one of those carries a moisture load a house never approaches, and it lands squarely on the glass.
Why Bellingham Chooses Bellingham Window Replacement
- ✓We take a relative humidity reading in the house before we price a single window, because the complaint that brought you to us is often not about glass at all
- ✓If your bath fans are the problem we say so and leave without an order, and we tell you roughly what the fan should cost you
- ✓We quote the sealed unit before the whole window, since a fogged pane in sound sash with sound hardware is a glass job and gets priced like one
- ✓Every replacement quote names the ventilation the house will need once it is tight, in writing, next to the window price
- ✓Laminated glass here is sold for forced entry and for noise, never for storms, and we put that distinction on the estimate
- ✓We keep at least one easily openable unit in every wet room, even where a fixed pane would price better and look cleaner
About Bellingham Window Replacement in Bellingham, WA
Bellingham Window Replacement is a window and door company that spends a surprising amount of its time talking about air. We fit replacement windows, patio sliders, entry doors and insulated glass right across Whatcom County and northern Skagit, and we treat the flashing detail as seriously as the glass package.
The reason we lead with humidity is that half the calls this market generates are ventilation problems wearing a window costume. Somebody replaced thirty leaky units, the house went tight, and the moisture the building was already producing had nowhere left to go. The glass is fine. The house needs a fan and a sheet of plastic.
So here is the case for not hiring us. If you have room-side condensation and no fogging between the panes, do not buy windows from us or from anyone else yet. Get a hygrometer, run the bath fan for an hour after every shower, cover the crawl space floor, and see where you land in three weeks. If that fixes it, we just saved you several thousand dollars. If it does not, call us and we will talk about glass.
Service Areas
Bellingham Window Replacement serves Bellingham, WA and surrounding communities including:
How It Works
We read the house before we read the window
The first visit is a hygrometer in two or three rooms, a tissue test on every bath fan, a hand held over the kitchen hood outlet to find out whether it vents outside or just recirculates, and a look under the floor. It takes ten minutes and it shapes almost everything that comes after.
Measure, then specify to the opening
Every opening gets measured at three heights and three widths, because old frames rack over time. We check egress clearances on bedrooms, safety glazing locations near doors and tubs, and whether the header can carry what you want. Then we write a specification rather than handing you a brochure page.
Install with the water detail first
Sloped sill pan with sealed corners, flexible flashing lapped so water runs out of the wall, low-expansion foam at the perimeter and interior air sealing before any trim goes back on. The window is the easy part. The flashing decides whether the wall is still sound in fifteen years.
We come back in the first cold week
Once the weather turns properly we come back, take a second humidity reading in the same rooms, and compare it against the first one. If the house has gone up, we deal with it then, on our time, rather than arguing about whose fault it is in February.
Recent Projects Across Whatcom County and northern Skagit
What Bellingham Customers Say
They took a humidity reading in three rooms before they would quote anything, which nobody else did. Turned out our kitchen hood was recirculating straight back into the room. We fixed that first and did the windows in spring.
Wanted clad-wood in the front rooms. They told me the bedrooms were sitting at 58 percent in December and the wood stools would go black. We sorted the fans, waited a month, then they built exactly what I asked for.
Two fogged units in the dining room. They replaced just the glass and left the sash alone, about a fifth of what the last quote said. Told me the rest of the house was fine and did not try to sell me anything else.
Whole house of 1970s aluminum sliders. They warned me before we started that the place would feel damp afterwards and priced a fan into the job. It did, the fan handled it, and nobody had to argue about it in January.
Storefront, taproom and commercial glazing across Whatcom and northern Skagit
Commercial glass in this county means downtown storefront, waterfront and industrial frontage out toward the airport, and an unusual concentration of taprooms, coffee roasters and food businesses.
Those last ones matter to us because the moisture load in a busy taproom on a wet Friday is nothing like a house, and it lands on the coldest surface in the room, which is always the storefront glass.
So we survey the exhaust and the makeup air before we quote the framing, because better glass under an undersized hood just moves the problem further along the wall.
- ✓Thermally broken aluminum storefront with polyamide struts where the space is heated and occupied
- ✓Plain storefront framing quoted without upsell where the building is unheated storage or a shop bay
- ✓One inch insulated units, tempered or laminated, with legible permanent safety glazing marks
- ✓Failed sealed units and cracked lites replaced in existing framing wherever the frame is still sound
- ✓Overnight board-up and next-day glass after a break-in, scheduled around your opening hours
- ✓Storefront door repair: continuous gear hinges, closers sized to the leaf, panic hardware to occupancy
- ✓Exhaust and makeup air reviewed alongside the glazing on restaurants, taprooms, clinics and gyms
- ✓Permits pulled with the City of Bellingham or Whatcom County and inspections scheduled by us
Frequently Asked Questions
My new windows are sweating on the inside. Are they defective?
Almost certainly not. Wipe the glass. If the water comes off on the cloth, that is room-side condensation and it is coming from your indoor air, not from the window. Air at 68 degrees and 50 percent relative humidity has a dew point near 49 degrees, so any surface colder than that will collect water.
Your old leaky windows were carrying moisture out of the house around the clock, and the new ones have stopped doing that. Fogging trapped between the two panes, which no cloth will reach, is a completely different thing, and that is a failed sealed unit we will replace.
Do I need a permit to replace windows in Bellingham?
Usually yes. The City treats replacing a window as altering the building, and its own permit handout lists what is exempt, which covers things like window awnings projecting less than 54 inches rather than the windows themselves. Enlarging an opening, cutting a new egress window or changing anything structural definitely needs one.
We pull permits through the City of Bellingham Permit Center on Lottie Street, or through Whatcom County Building Services if you are outside the city limits, and we schedule the inspections ourselves.
Will new windows pay for themselves in heating savings here?
Not in fuel, and anybody who tells you otherwise is guessing. Bellingham runs about 5,559 heating degree days a year, which is a real heating load but not a Minnesota one, and our power is comparatively cheap.
What you get instead is even room temperatures, no cold draft along the sofa, glass you can sit next to in January, sash that open with one hand, and a lot less street noise. Those things are worth buying. A fuel payback is not the reason to do it.
How do I tell a failed seal from ordinary condensation?
Location, and you can check it in five seconds. Water or frost on the room side of the glass wipes off, and that is indoor humidity meeting a cold surface.
Haze, streaks or droplets sitting between the two panes cannot be wiped from either side, and that is a failed insulated glass unit where the seal has let the argon out and moist air in. We replace the sealed unit and keep your existing sash and frame, which costs a fraction of a whole window.
Do you work outside the city, up the Mount Baker Highway or over to Point Roberts?
Yes. We cover Whatcom County from Point Roberts and Blaine down through Ferndale, Lynden and Everson, out the Mount Baker Highway to Deming, Kendall and Maple Falls, and south into northern Skagit as far as Mount Vernon, Anacortes and La Conner. Remote jobs get scheduled in batches so you are not paying for a border queue or an hour of driving, and we will tell you honestly when the travel makes a small repair uneconomic.
What is the best time of year to replace windows in this climate?
Any month. We take one opening at a time, dry it in, and it is closed again the same day, so weather is a scheduling problem rather than a real obstacle. The pattern worth knowing is a different one: whatever month you install, the humidity complaint arrives during the first genuinely cold week afterwards.
Install in July and it turns up in November. That is why we build a second visit into the job instead of waiting for the phone to ring.