Galvanized corrugated window wells: the value option, and how to make one last on clay

Galvanized corrugated steel is the window well most Fort Collins houses already have, and it is still the right choice for a lot of them. It is the least expensive compliant well, it is available in every code size, and with the right thing underneath it, it lasts. The honest caveat is the soil. On the expansive clay that sits over the Pierre Shale under this city, a galvanized well lives or dies by its drainage column, not by its zinc. Installed as a replacement it runs $1,100 to $3,300; as part of a full egress install it is inside the $3,800 to $7,000 range.

What it is

A shell of corrugated, zinc-coated steel, rolled into a rounded or rectangular shape, with a flange on each end that bolts to the foundation wall. The corrugations give a thin sheet enough stiffness to hold back soil. It comes in standard widths and projections that meet the 36-inch, 9-square-foot egress minimum, and in heights that stack or extend for deep wells. A ladder bolts through the corrugations. A polycarbonate or grate cover sits on the rim.

That is the whole product, and its simplicity is its case. There is nothing to fail except the steel and the anchors, and both are visible.

Where it earns its money on Front Range clay

Shallow and mid-depth wells. Under 5 feet, in a drained column, the soil load is well within what the corrugated shell carries, and there is no reason to pay more.
Utility and non-bedroom windows. A well in front of a laundry room does not need steps or a finished look. Steel with a cover is the right spend.
Multiple wells in one mobilization. A basement finish with two or three new openings prices meaningfully better with steel wells, and the savings can fund the drainage that actually matters.
A house that will sell soon. A compliant steel well with a proper ladder satisfies the inspection and the appraisal conversation for the least money.

Where it is the wrong well

Deep wells on sloped lots. A tall shell retaining a lot of soil on the uphill side is where light-gauge steel bows. The caving well page shows the result.
Wet clay backfill. The Colorado Geological Survey says these clays can expand up to 20 percent by volume and push with up to 30,000 pounds per square foot. Steel backfilled with native clay and watered by a sprinkler gets pushed, then heaved, then perforated. We do not install steel that way, and if a previous installer did, the heaving well page explains what you are seeing.
Wells that hold water. Steel standing in water rusts from the bottom. If the site has high groundwater, which a CSU study found on roughly 10 percent of Fort Collins-area parcels and most parcels along the Poudre, the well needs a pumped outlet, and a composite well tolerates the damp better while that is sorted.
Wells seen from a finished bedroom. Corrugated steel is not the view most people want from a room they paid to finish. A composite terraced well is.

Pricing in this market

Scope	Range
Galvanized well replacement, existing opening, with drainage column	$1,100 to $3,300
Ladder added to a sound existing well	$350 to $1,100
Liner inside a sound but rusty steel well	$450 to $950
Fitted cover	$175 to $650
Drainage rebuild under an existing well	$350 to $1,100
Full egress install with a galvanized well	$3,800 to $7,000
Fort Collins permit, passed through at cost	typically $150 to $300

All of these are on the pricing page, and the well cost calculator combines them for your situation.

How we install it so it lasts

The city’s egress guide says a new well “shall be designed for drainage and connected to the building’s foundation drain (if present).” That sentence is the difference between a steel well that lasts and one that does not. Ours go in like this: excavate below the well bottom, lay filter fabric and clean washed rock as a column that reaches the foundation drain or a deep dry well, set the well on that column with the flange anchored into sound concrete, backfill behind the shell with rock rather than the clay that came out, grade the surface away from the house, extend the downspout, and fit a cover. If the well is deeper than 44 inches, the ladder goes in with rungs 12 inches wide, no more than 18 inches apart, encroaching no more than 6 inches into the well, which is what the Fort Collins guide draws. CSU Extension’s advice for homes on expansive clay, non-irrigated mulch along the foundation and roof water directed away, is what we ask you to do after we leave.

The honest comparison

Steel is the right answer more often than the premium-well marketing suggests, and the wrong answer more often than the lowest bid suggests. If a quote for a steel well does not itemize the gravel column, the anchors, the ladder, and the cover, it is a quote for a bucket. The composite and engineered kit pages cover the cases where the extra money is worth it, and the free on-site measure is where we tell you which one your hole needs. We install all three across Fort Collins, Loveland, and Windsor.

Frequently Asked Questions

How long does a galvanized window well last in Fort Collins?

It depends almost entirely on what is under it. Set in a drained gravel column tied to the foundation drain, with the grade falling away and no sprinkler on the wall, galvanized steel lasts decades here. Set on native clay with a scoop of rock, it sits in water every spring and rusts through at the soil line in a fraction of that time.

What does a galvanized well cost installed?

$1,100 to $3,300 for a replacement in an existing opening, which includes the well, anchors into the concrete, the gravel drainage column, backfill graded away from the house, and the code ladder where the well is deeper than 44 inches. As part of a full egress install the well portion is folded into the $3,800 to $7,000 range.

Is galvanized steel strong enough for expansive clay?

For a shallow to mid-depth well in a drained column, yes. For a well over 5 feet, a well retaining soil on a sloped lot, or a well backfilled with wet clay, light-gauge corrugated steel is the material most likely to bow. The caving well page shows what that looks like. Those sites get a composite or engineered well.

Can a galvanized well meet egress code?

Yes. Sized to 36 inches of projection and 9 square feet of area, with an anchored ladder whose rungs are at least 12 inches wide and no more than 18 inches apart if the well is deeper than 44 inches, it meets the dimensions in the City of Fort Collins guide. The material is not the code question; the size, the ladder, and the drainage are.