Basement Waterproofing Cost in Des Moines, IA (2026)
What a basement costs to waterproof in Des Moines, IA, in Polk County, Iowa, depends on how many feet of wall leak, the material those walls are built from and which repairs the house truly needs. Below are dated national ranges with their source, the things that push a job up or down, and what a written estimate should show.
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Costs at a Glance
| Cost row | Figure | Source (year) |
|---|---|---|
| Typical basement waterproofing project | about $3,000 to $10,000 (average about $5,000) | Fixr national (2026) |
| Interior perimeter drain, per linear foot | $40 to $120 | Fixr national (2026) |
| Sump pump installation | $600 to $2,500 | Fixr national (2026) |
| Epoxy crack injection, per crack | $250 to $1,000 | Fixr national (2026) |
| Waterproof paint or sealant, per sq ft | $1 to $8 | Fixr national (2026) |
Every row comes from Fixr's 2026 national guide. No Des Moines or Iowa price source was used, so treat the figures as a yardstick, not a price for your house. A local price shifts with the age of the house, the wall material, how easy the walls are to reach, the share of the basement involved and any plumbing in the mix.
Real jobs mix rows. Say half of a 150-foot basement perimeter seeps, which means about 75 feet of interior drain. Put in a new or first pump and inject one crack, and at national rates the job comes to roughly $3,900 to $12,500. Plug your own basement into the cost calculator for the same kind of estimate.
Some work sits outside every row. Backwater valves, ejectors, sump tie-ins, sewer-line repairs and other drain connections are plumbing, priced by a state-licensed plumber. A new circuit or outlet for a pump is electrical work, egress windows aren't modeled, and permit fees are set by the office that issues them. At Des Moines addresses, the City runs a program for some plumber work on backwater valves and sump discharge; it has its own conditions, explained on the Iowa rules page.
Why Two Basements Cost Differently
Much of what moves a figure is visible before anyone breaks concrete:
- Feet of drain. Drain tile is billed per linear foot, which makes a single wet wall a much smaller job than a full loop.
- Wall type and age. About 27% of Des Moines homes were built in 1939 or earlier and nearly half before 1960 (Census survey data); older brick, block and poured walls may need different methods.
- Newer basements. Newer homes are often built with drain tile and a sump that can still clog or fail, so the work may be a repair, a new pump or regrading rather than a new system.
- The sump. Cutting a new pit costs more than swapping a pump in a sound basin; a battery backup or alarm is its own line.
- Crack count. Injection is charged crack by crack.
- Excavation. Opening the ground outside a wall brings in machines and labor that an indoor trench skips; with no sourced figure for it, this page leaves it unpriced.
- Finished space. Drywall, flooring, storage or mechanical equipment along the walls can add moving and patching time.
What to Expect in Writing
A real number comes on paper from the one contractor who has seen the basement. This site collects no estimates, so check that contractor's figure against the ranges above and look for these points:
- Business and registration. The business name on the estimate and the contract, and its Iowa contractor registration, which you look up yourself with DIAL at 515-242-5871 or on its public portal.
- Scope and footage. Which walls, how many linear feet of drain, and whether any digging outside is included.
- Pump and outlet. Pump details, backup, alarm and a discharge point outdoors, never a floor drain or the sanitary sewer.
- Permits and the plumber. Which permits apply, who pulls each one, and the name of the state-licensed plumber for any sewer or drain connection.
- Price and payments. An itemized total and when each payment falls due, paid as the work moves along and never all up front.
- Lien waivers. Ask for signed lien waivers before you make the last payment; it's a general safeguard.
- Warranty terms. What the warranty covers, in writing, and whether it passes to a buyer.
If you agree to $25 or more of work somewhere other than the contractor's place of business, such as your living room, Iowa's door-to-door law generally allows cancelling until midnight of the third business day, and the contract should say how. Insurance certificates and a few recent local customers round out the paperwork.
Coverage Questions
According to the Iowa Insurance Division, many homeowners policies leave flood damage out as a standard exclusion, and coverage for water or sewer backup doesn't come with a regular policy automatically. Gradual seepage is excluded by many policies too. Read your own policy, put your questions to your insurer or agent before work begins, and plan the budget as if the bill is yours. This site handles no insurance matters and can't say what any policy pays.
A floor drain that gives water back is a sewer problem, not a groundwater one, in most cases. At a Des Moines address, report it to Public Works at (515) 283-4950 or through the myDSMmobile app. Windsor Heights, Polk City, Bondurant, Pleasant Hill and Norwalk, IA each run their own sewers, so a backup there goes to that city.
Next Step: A Written Estimate
For a rough budget built on your own basement, the cost calculator is a start. A firm number takes someone standing in the basement. Once you send the form, one independent contractor near Des Moines reaches out, handles any visit on its own terms and puts its estimate in writing. The request itself costs nothing, and although contractors may pay a flat advertising fee here, this site sets no prices and does no basement work. Everything starts with the form.