Egress window installation in Des Moines
A basement bedroom without a compliant escape opening is not a bedroom — not for the fire code, not for the permit file, and not on the disclosure form when you sell.
Who handles egress window installation in Des Moines, IA?
Des Moines Basements installs code-compliant basement egress windows in Des Moines — foundation cutting, window and well installation, and well drainage tied into the basement drainage system. Call (515) 676-4747.
- Typical cost: $3,500–$7,000 in Polk County
- Soil: Clarion-Nicollet-Webster on the Des Moines Lobe — ~60% aquic, drains poorly
- Frost depth: 42" — footings and discharge lines must sit below it
- Code: Iowa Residential Code, based on the International Residential Code and adopted with Iowa amendments
- Service area: Des Moines and 9 surrounding counties, 45-mile radius
What the code requires
Iowa follows the IRC. A basement sleeping room needs an emergency escape and rescue opening of 5.7 square feet net clear, with 5.0 square feet permitted where the opening is at grade level. The sill can be no more than 44 inches above the floor, and the window well must give at least 9 square feet of horizontal area with a projection and width of at least 36 inches.
Every basement sleeping room needs its own opening. A single window serving a hallway does not cover two bedrooms, and a finished basement with two bedrooms and one egress does not comply regardless of how the space is used day to day.
The drainage detail that matters
A window well is a hole in the ground against your foundation, and on flat Central Iowa ground it fills fast during a storm. The well needs a drain connected to the footing drain or its own outlet, and gravel to the base. Without it you have built a cistern against the wall and the window becomes the entry point.
This is the single most common reason an egress installation creates a leak in a house that was previously dry. It is not the window; it is the well. A cover is worth fitting too — both for safety and to keep debris and snowmelt out of the well.
Cutting a new opening in a foundation wall is structural work. It needs a header sized for the load above, and it needs a permit from the City of Des Moines Permit and Development Center or the relevant suburban jurisdiction.
Why Central Iowa ground drives this
Polk County sits on the Des Moines Lobe — the youngest glacial landscape in Iowa, left by ice that retreated only about 12,000 years ago. The soils are the Clarion-Nicollet-Webster association: Clarion well drained on the rises, Nicollet somewhat poorly drained on the slopes, and Webster poorly drained in the low ground. Roughly 60 percent of the landscape is classed as aquic — wet by default.
Because the Lobe is so young, natural drainage networks have not had time to cut. Relief across much of the metro is under five metres, and water that lands here does not run to a stream — it sits until it soaks in or evaporates. Saturated till backfill can exert well over 1,000 lb of lateral force per linear foot against a foundation wall — but in Des Moines the more common failure is volume rather than pressure: more water arriving in an hour than the ground can take in a day.
Central Iowa is dotted with prairie potholes — closed depressions with no outlet at all. Most were tile-drained and built over as the metro expanded, and a house sitting in a filled pothole is sitting in a bowl. The confluence of the Des Moines and Raccoon rivers keeps the water table shallow through the older river-adjacent neighborhoods. In the older core neighborhoods the problem compounds — des moines' older neighborhoods — sherman hill, drake, beaverdale, the east village — carry a large stock of pre-1940 housing on block and rubble foundations built before perimeter drainage was required.
Egress Window Installation questions
What does an egress window cost in Des Moines?
Budget $3,500 to $7,000 in Polk County. That covers the cut, the header, the window, the well, its drain and backfill. Poured foundations cost more to cut than block, and on flat ground a well drain that has to reach a distant outlet adds to the total.
Do I need a permit for an egress window?
Yes. Cutting a foundation wall is structural. The City of Des Moines Permit and Development Center permits it inside the city; Ankeny, Waukee, West Des Moines, Urbandale and the rest handle their own. Inspection covers opening size, sill height, header and well dimensions.
Can any basement window be made into an egress?
Almost never as it stands. Existing Des Moines basement windows are typically far under the 5.7 square feet an escape opening needs, and most sit above the 44-inch sill limit. Bringing one into compliance means enlarging the opening downward and outward, which is structural work with a permit attached.
Will an egress window make my basement leak?
It can, and the cause is always the well rather than the window. A well without a working drain fills during a storm and holds water against the wall. Built properly — gravel base, drain tied to the footing drain or an outlet, cover fitted — it should not leak at all.
Related basement services
Vapor Barrier Installation
There is no leak to find and no puddle to photograph. Bare ground under a house releases moisture as vapor continuously, and in an Iowa July that load lands in the rooms above as clammy air an air conditioner cannot dry.
Efflorescence & Wall Staining
Nothing is growing on your wall. That white crust is salt the water left behind on its way through the block — harmless in itself, and one of the more useful diagnostic signals a basement offers.
Find out what's actually causing it.
A free on-site inspection and a written scope — before any work is quoted.