Rusted window well: liner or replacement, and what each costs in Fort Collins

A rusted corrugated window well is either a liner job or a replacement job, and one screwdriver test decides which. Solid steel under the rust means a liner at $450 to $950. Perforated or flexing steel means a replacement at $1,100 to $3,300, which includes a code-sized well, anchors, and the gravel drainage bed the old one probably never had.

Check this first (two minutes, one screwdriver)

Find the soil line. Rust is always worst in the band from an inch above grade to a few inches below, where the steel is wet on the outside and gets oxygen on the inside.
Push the screwdriver in. Hard, at three or four spots around the well. Stopping on metal is good news. Going through is not.
Grab the rim and rock it. A well with structure resists. A well that flexes at the soil line or at the flange bolts has lost its ring strength and is being held up by the dirt.
Look at the anchors. Rust that has eaten the flange around the bolts means the well is no longer attached to the house, whatever the rim looks like.
Dig into the bottom. If it is silt, not rock, the well has been standing in water, which is why it rusted, and a liner will not fix the cause.

What is usually wrong

What you see	Likely cause	Fix and cost
Orange scale, screwdriver stops	Surface rust on sound steel	Liner $450 to $950, or leave it and add a cover $175 to $650
Perforation at the soil line	Steel consumed from the wet side	Replacement $1,100 to $3,300
Flange rusted through at the anchors	Well no longer attached to the foundation	Replacement, same range
Rust plus standing water every spring	Dead gravel bed, well sat in water for years	Replacement with drainage rebuild, upper half of range
Rust plus a window that is short of code for a bedroom	Two jobs in one hole	Full egress install $3,800 to $7,000, enlargement $2,800 to $5,000
Rust on a well under 44 inches deep in front of a non-bedroom	Cosmetic, no code exposure	Liner or wait; honest answer is often wait

Why this happens in Fort Collins

Galvanized steel rusts when the zinc runs out, and the zinc runs out fastest where the steel stays wet. The soil on most Fort Collins lots is the problem. The Colorado Geological Survey’s map of the Fort Collins quadrangle says the area is underlain by the Pierre Shale and that swelling soils over that shale are among the most common hazards mapped. The Nunn series, the USDA soil whose type location is in Larimer County near the Harmony School, is a smectitic clay. Clay like that holds water against the outside of the well for months after the March and April melt, and the freeze-thaw season is long: the NOAA normals for the CSU campus station put the median last spring freeze at May 1 and the median first fall freeze at October 6. That is a lot of wet, cold, expanding soil against thin steel.

The inside rusts for a different reason. A well set on native clay with a token scoop of gravel underneath holds water after every storm, and the steel sits in it. Once the bed silts, the well is a bucket, and buckets rust from the bottom up. The flooding well page explains that failure in detail.

Liner or replacement, honestly

A liner is a rigid shell fitted inside the existing well. It is a real fix when the old well still carries the soil load: the steel passes the screwdriver test, the anchors are tight, and the shape is true. It costs $450 to $950 and buys years.

A liner is a bad fix when the well is perforated, bowed, or loose at the flange, because the liner then hides a structural failure and the soil load ends up on the liner and the window. We will say so on site rather than sell the cheaper job.

Replacement at $1,100 to $3,300 buys the well, anchors set into sound concrete, a gravel column underneath tied to the foundation drain where the house has one, backfill graded away from the wall, and the code ladder if the well is deeper than 44 inches. If the room behind the window is a bedroom, the replacement well has to meet the code dimensions: 36 inches of projection and 9 square feet of area under the city’s current guide. If the old well is smaller than that, replacement is also the moment to bring it up to size.

When to call

If the screwdriver went through, if the flange is loose, or if the well is rusted and also floods, send the form with a photo of the soil line and one of the bottom of the well. Say whether the room behind it is a bedroom. The well cost calculator prices liners, replacements, covers and drainage on the page before you do. We handle rusted wells across Fort Collins, Loveland, Greeley, and Berthoud, and the galvanized steel and composite pages will help you decide what goes back in the hole.

Frequently Asked Questions

How do I know if a rusted window well needs replacing?

Push a screwdriver into the steel at the soil line, where rust is always worst. If the point stops on solid metal under the scale, the well has structure left and a liner at $450 to $950 is honest. If it goes through, or the steel flexes like cardboard, the well is done and replacement at $1,100 to $3,300 is the only fix that lasts.

Why do window wells rust so fast here?

The galvanizing is thin, and the clay against it stays wet. Fort Collins soils over the Pierre Shale hold water rather than draining it, so the outside of the steel sits in damp clay for months after every melt. Wells with a dead gravel bed rust from the inside too, because the water has nowhere to go.

Can I paint or coat a rusted well?

Paint on the inside face slows surface rust and does nothing for the soil side, which is where the steel fails. A proper liner is a rigid shell fitted inside the old well, not a coating, and it works only when the old well can still carry the soil load.

Does a replacement well have to be steel again?

No. Galvanized corrugated steel is the value choice and, with a real gravel bed under it, lasts a long time. Composite and terraced wells cost more and have no rust clock at all. The brands pages compare them honestly, and the drainage under the well matters more than the material of it.