Basement Window Replacement in Billings

Basement window replacement means pulling a failed window out of an existing opening and setting an insulated modern unit in its place: no concrete cutting, no excavation, no change to the size of the hole. In Billings this runs $400 to $1,100 per window installed, takes a few hours, and works year-round, including the middle of January. It is the right job when your basement windows are fogged, rusted, drafty, or made of glass block, and the wrong job if what you actually need is a legal bedroom.

That distinction matters, so it comes first.

A swap is not an egress window

IRC R310, adopted in Montana’s 2021 residential code, requires a basement sleeping room to have an opening with at least 5.7 square feet of net clear area, 24 inches of clear height, 20 inches of clear width, and a sill no higher than 44 inches. The original basement openings in nearly every Billings home, from the 1950s ranches west of downtown to the 1990s bi-levels in the Heights, are roughly 32 by 16 inches or smaller and set high in the wall. No window you put in that hole will make it egress. The hole itself has to change, which means sawing concrete. That is egress window installation, and it costs $3,500 to $6,500.

If you are finishing a bedroom, start there. If you are fixing a laundry room window that has been fogged since the Clinton administration, keep reading.

What fails in Billings basements

Steel-sash single-pane hoppers. Standard in the 1950s and 1960s stock on the South Side and in the Central neighborhoods. Sixty-plus years of condensation have rusted the sashes, the putty is gone, and the glass moves in the frame. They lose heat all winter and let dust in all summer.

Aluminum sliders from the 1970s and 1980s. Common in the Heights and the first West End subdivisions. Aluminum conducts cold straight through, so they frost on the inside in January, and the seals on the early insulated glass have long since failed, leaving a permanent fog between panes.

Glass block. Installed as a security fix or a cheap way to close up a broken window. It does not open, it is not egress, and it is not insulated to any modern standard. Removing block is more work than removing a sash window because it is mortared into the opening.

Wood-buck rot. The pressure-treated buck (the wood frame between the concrete and the window) is often not pressure-treated at all in older homes. If it is soft, it gets rebuilt as part of the job, which is one of the things that moves a swap from the low end of the range toward the high end.

What we install

Insulated vinyl units built for below-grade openings: welded frames, low-E dual-pane glass, and a style matched to the opening and the room.

• Hoppers tilt in from the top. The classic basement style; good ventilation, easy to clean from inside.
• Sliders open sideways. Best where the opening is wider than it is tall, which describes most Billings basements.
• Casements crank out. The most airtight of the three, and the style that clears egress numbers in the smallest opening, which matters if you are pairing a swap with a future cut.

Frost days count here. NOAA’s 1991 to 2020 normals put the Billings January mean at 27 degrees with a typical January low around 18; a basement full of single-pane steel windows is a basement with a cold floor overhead. Sealed, insulated units in every opening are one of the cheaper comfort upgrades a Billings house can get.

The job, start to finish

1. Measure. Each opening measured for width, height, and depth, the buck probed for rot, and the exterior checked for a well, grade, and flashing. If the opening is below grade and the well is rusted or full of silt, we tell you, because a new window in a flooding well is a new fogged window in three years. See well replacement.
2. Remove. Sash, frame, and any glass block come out. Mortar and old caulk get ground clean.
3. Buck. Rotten wood is replaced with pressure-treated lumber anchored to the concrete.
4. Set. Window shimmed square and plumb, low-expansion foam in the gap, exterior flashed and sealed with a sealant rated for masonry and vinyl.
5. Finish. Interior trim or drywall return, screens, hardware. Cleanup takes ten minutes.

A typical three-window basement is a morning.

Pair it with a well cover

Most below-grade basement windows in Billings sit inside a corrugated well that is as old as the window. If the well is sound but open, a clear polycarbonate cover at $150 to $600 keeps April snow and cottonwood leaves off the new glass and stops the well from filling from above. If the well is rusted at the soil line or leaning, it should be replaced in the same visit; a new window looking out into a failing well is a job half done. We tell you which at the measure and price both on one sheet. Details on the covers and drainage page.

Pricing

Full details on the pricing page. Price moves on size, style, buck condition, and whether the exterior needs work.

Permits and towns

The City of Billings runs windows and doors through the same CityView portal as every other permit, and a same-size replacement is usually a simple permit or, depending on scope, none. We sort that out at the measure. Laurel’s building department covers Laurel. Lockwood, Shepherd, Huntley, and Columbus have no residential building permit at all. Same crews, same units, same price sheet in Laurel, Lockwood, Shepherd, Huntley, and Columbus.

The winter job

This is the work we point people to when they call in December wanting egress. The ground is frozen to 36 inches, the excavator is parked, but a window swap does not care. Get the failing windows out now, get the permit for the egress cut lined up, and be first on the schedule when the ground opens in March. If the goal is a legal bedroom by summer, that order is the right one. Questions on which job you need? The FAQ sorts the common ones, and the free measure settles the rest.