Egress Window Installation in Billings, Montana

Billings Egress Windows installs code-compliant basement egress windows across Billings and Yellowstone County: concrete cutting, windows sized to IRC R310, and window wells with proper ladders and drainage. A full install typically runs $3,500 to $6,500. Inside city limits we pull the permit through the City of Billings Building Division and the job ends with the city’s final inspection. Free on-site measure, flat written quote, no surprises.

If you are finishing a basement bedroom, fixing a room an inspector just flagged, or replacing a rusted corrugated well that fills up every April, this is the work we do, and nothing else.

Why egress windows are a Billings project

Billings is the largest city in Montana, 117,116 people at the 2020 census and roughly 193,000 in the metro, and it grew up with basements. The 1950s and 1960s ranches west of downtown, the split-levels and bi-levels that filled the Heights from the 1970s through the 1990s, the older stock on the South Side and in the Central neighborhoods, the West End subdivisions that keep pushing toward Shiloh Road and beyond: nearly all of it has a full basement, and most of those basements were sold unfinished with a couple of small hopper windows set high in the wall.

Then the market changed. Rental vacancy in Billings has been running around 4 percent, the median list price sat near $350,000 in early 2025, and healthcare at Billings Clinic and Intermountain Health keeps bringing people to town. The cheapest bedroom in Billings is the one under your own roof. Basements here get finished, and every basement sleeping room needs a legal way out.

Here is the catch. Montana adopts the 2021 International Residential Code, effective statewide June 11, 2022, and the City of Billings adopted the same edition on September 1, 2022. Section R310 requires an emergency escape and rescue opening in every basement sleeping room. A finished room with a 16-inch hopper window is not a bedroom. It will not count on an appraisal, it gets flagged in a pre-sale inspection, and in a fire it is a trap. Adding a compliant egress window is what turns that space into a real, countable, safe bedroom. If you are staring at an inspection report right now, start at code compliance upgrades.

What the code actually requires

These are the numbers we build to, from IRC R310 as adopted in Montana. The City of Billings Building Division publishes the first four on its own website, under “What are the requirements for egress windows?”, citing IRC Section 310:

Two things trip people up. First, “net clear opening” is the hole you can crawl through with the sash fully open, not the glass size and not the rough opening. A slider only opens half its width. Second, the well is code, not an accessory. An undersized well or a missing ladder fails an inspection as fast as an undersized window. Montana’s amendments to the IRC touch stairs, guards, footings, and sprinklers; they leave R310 alone, so the national numbers are the Billings numbers.

What we do

• Egress window installation: the whole job. Layout, permit, excavation, concrete cut, framed opening, window, well, drainage, backfill, and inspection.
• Window well installation: code-sized wells with anchored ladders and gravel drainage, for new openings or to replace rusted, bowed corrugated wells.
• Basement window replacement: swap failing single-pane or glass-block basement windows for efficient units in the existing opening. No cutting, and it runs through the winter.
• Well covers and drainage: polycarbonate covers plus gravel beds and drain-tile tie-ins. On the clay terraces of the Yellowstone valley, drainage is not optional.
• Concrete cutting: diamond-blade sawing of poured and block foundations for window and door openings, with proper lintel and header work.
• Code compliance upgrades: bring an existing basement bedroom up to R310 before a sale, an appraisal, or a rental inspection.

Honest pricing, published

Most contractors in town make you sit through a sales visit to hear a number. We publish ours:

Price moves on foundation type, dig depth, soil, and access. A poured wall in a 1995 Heights bi-level with a wide side yard digs differently than a 1955 block wall on a narrow South Side lot with the neighbor’s fence four feet away. The pricing page breaks all of it down. Every job starts with a free on-site measure and ends with a flat, written quote.

How the job goes, start to finish

1. Measure and quote. We check foundation type, footing depth, joist direction, grade, and what is running through the wall cavity, then hand you a flat number.
2. Permit. Inside city limits, we submit through the Building Division’s CityView portal (the city requires online submission for every permit). The city quotes four to seven business days for the initial residential review once the application is complete. We also call 811 for utility locates before a shovel goes in.
3. Excavate. Typically a 5 to 6 foot deep dig outside the wall, below the new sill and deep enough for real drainage. Billings designs footings to a 36-inch frost depth, and the drainage bed has to work below that.
4. Cut the concrete. Diamond-blade wet sawing for poured walls; block walls come out course by course. It is loud and dusty for a few hours. We tarp, contain, and clean up.
5. Frame and set. A lintel or header where the wall above needs one, a pressure-treated buck frame anchored to the concrete, then the window: shimmed, insulated, flashed, and sealed.
6. Well and drainage. A code-sized well anchored to the foundation over a gravel bed, tied to the footing drain tile where the house has one, or a deep gravel dry well where it does not.
7. Backfill, grade, ladder, cover, inspection. We call in the city final and you get a legal, light-filled opening.

Full detail on the egress window installation page.

Soil, water, and why drainage gets its own line item here

The USDA soil survey for Yellowstone County maps the broadest stretch of river terraces and low fans in the county between Billings and Laurel, with more of the same northeast of Shepherd and Huntley: deep silty clay loams and silty clays over stratified clay. It also counts roughly 82,000 acres of saline, saline-sodic, or sodic soils in the county, and it is blunt about what sodium does to clay: the clay disperses, permeability to water and air goes slow, and shrink-swell potential goes high. On the flood plains it puts the water table within 60 inches of the surface, with flooding at snowmelt.

That is the ground your window well sits in. A well set in slow-draining clay with no gravel bed and no outlet is a bucket bolted to your foundation. The Yellowstone hit a record 16.2 feet at Billings on June 15, 2022, high enough that the city shut its water plant down, and while most homes are well above the river, the valley’s spring runoff and a wet week of May rain show up in window wells every year. We build the drainage first and the well on top of it. See well covers and drainage for the exact build-up.

When to do it: the Billings calendar

NOAA’s 1991 to 2020 normals put the Billings January mean at 27 degrees, with about 57 inches of snow a year and measurable snow in every month from September through May. Chinook winds break the cold open several times most winters, which is why Billings ground rarely stays frozen to full depth for months at a time the way it does farther east. Still, the reliable excavation season is roughly March through November.

The rhythm of a smart project: get measured and quoted any time of year, use the winter to lock the permit and pick the window and well, cut in spring or fall. Sellers should work backwards from the listing date. Permit review runs about a week, the install one to two days, so a flagged basement bedroom is a three-week fix in season, not a weekend one. And if all you need this winter is a basement window swap in an existing opening, that work does not care about frost.

Straight talk

Two things we will not do. We will not guarantee a permit approval or promise your room “will pass.” The permit and the final inspection belong to the City of Billings, and any contractor who guarantees an outcome from a city inspector is selling you something. What we promise is that the work is built to IRC R310 as adopted in Montana and that we handle the permit process end to end.

We also will not pretend this is a window swap. Cutting a foundation is structural work. The two ways cheap installs fail are undersized lintels (stair-step cracks above the opening within a few years) and skipped drainage (a well that fills every spring). Both shortcuts are invisible on day one and expensive on day 500. If a bid comes in far under everyone else’s, ask specifically about the header and where the water goes.

On licensing: Montana does not license general contractors the way some states do. The Department of Labor and Industry registers construction contractors that have employees, and independent operators carry workers’ compensation or an exemption certificate. That is why we say “insured local installers” and do not print a registration number to impress you. Ask any bidder for proof of insurance and registration; they should hand it over without a speech.

Where we work

Billings is the hub, every neighborhood, every housing era: the Heights above the Rims, the West End, the Central and South Side blocks, Lockwood across the river. We also run crews to Laurel, Lockwood, Shepherd, Huntley, and Columbus. Permitting differs sharply by address. Laurel has its own certified city building department. Lockwood, Shepherd, and Huntley are unincorporated Yellowstone County, which issues no residential building permits, and the state program exempts dwellings under five units. Columbus is the Stillwater County seat, with no local building program. Outside Billings and Laurel, nobody inspects an egress window. We build it to code anyway, because the next home inspector will.

Get a free on-site measure

Tell us what you are working with: finishing a basement, a flagged inspection, a flooding well, a dark room that needs light. We will come measure, walk you through the options against the actual code numbers, and leave a flat written quote. If you landed here after searching “egress window contractors near me,” this is that: local crews, insured, quoting fast anywhere in the Billings area. Start with the form, check the FAQ, or read more about how we work.