Tell us where the water shows up and when. We'll call back fast and be out within 48 hours.
48 hoursto a free inspection, in writing, not weeks out
20+ yearskeeping water out of Chicago basements
1,500+ homesdiagnosed, dried out and still guaranteed
0% for 12 monthsfinancing on approval, no prepayment penalty
Where is the water getting in?
Chicago clay holds water against the wall every spring, and the entry point decides the fix. Pick what you're actually seeing and we'll show you what causes it.
One trade done properly, sized to the water you actually have. We install the smallest system that solves the problem, not the biggest one we can sell.
Warranty: lifetime, fully transferable
Interior systems, exterior systems, and the sump that runs them
Most Chicago basements are solved from the inside. Some need the wall dug out. The inspection tells you which, and the price is written down before anything starts.
Interior perimeter drain tile, tied into a properly sized pit
Exterior membrane and footing drains when the wall demands it
Sump pumps with battery backup for the night the power fails
Cove joint, wall crack and window well entry points sealed
Water-tested before we leave, warranty registered to the house
Three different problems get sold as one product in this market. They are not the same, they do not cost the same, and one of them is not our work at all.
Groundwater
An interior drainage system
Water arrives at the cove joint or through the wall itself after heavy rain or a spring thaw, and it comes back every season. The water table is the cause, so the fix is a path for it to leave.
Typical cost
$95 to $160 per linear foot, $8,000 to $16,000 for a full perimeter with sump and backup
Downspouts discharge at the wall, the grade falls back toward the house, or the yard holds water for a day after a storm. Roughly half the wet basements we inspect start here, not below the slab.
Typical cost
$600 to $2,500 for downspouts and regrading, French drains $45 to $90 per linear foot
Water rising out of the floor drain is a sewer or storm line backing up, and no waterproofing system touches it. Damp air with no visible water is usually humidity, and a dehumidifier beats a five figure quote.
Typical cost
A licensed plumber, or a dehumidifier that costs a few hundred dollars
What we charge
Nothing. You get the answer at the free inspection either way
The system is only as good as the parts around it. These are the pieces we install alongside it, priced individually so you can see what you are paying for.
Water problems and structural problems usually arrive together. We repair the wall as well as the water, so you are never refereeing two contractors blaming each other's work.
The person who inspects your basement is a diagnostician, not a closer. They're paid to trace the water, write down what causes it and price it honestly, whether or not you hire us. That's the whole business model.
What you get
A written diagnosis with photos and measurements
A fixed price that lands inside our published ranges
A warranty registered to the house that transfers at closing
The honest answer when the fix is gutters, not drain tile
What you won't get
A discount that expires when the salesperson leaves
A system quoted before anyone has measured anything
A different number at invoice time
Photos of somebody else's flooded basement
Our Basement Waterproofing Process
From first call to a dry basement in four steps, no mystery. Most waterproofing jobs finish in two to four days.
Call or book online
Tell us where the water shows up and when it happens. 24/7 response if water is standing right now.
Takes 5 minutes
On-site water diagnosis
We measure, photograph and trace the water back to its entry point. Free, within 48 hours.
60 to 90 minutes
Written plan and price
A scope with drawings and a fixed price that lands inside our published ranges. Take your time with it.
Same visit
Install, then water-test
Our own crew installs the system, runs water through it in front of you, and registers the warranty to the house.
We publish our prices. Real ranges from real jobs, updated as costs change, and your written quote lands inside them or we explain exactly why before you sign.
Waterproofing & drainage
Interior drain tileper linear foot$95–$160
Sump pump with battery backupinstalled$2,800–$4,500
Exterior French drainper linear foot$45–$90
Crawl space encapsulationper square foot$7–$14
Downspout extensions and regradingtypical job$600–$2,500
A full perimeter system with a sump and battery backup lands between $8,000 and $16,000 on most Chicago homes. See what moves a job inside the range.
Every service page shows the full range and what moves a job inside it. See complete pricing.
Crews based in the southwest suburbs
Basement Waterproofing Near You
Serving Chicago and the suburbs: Will, Cook, DuPage, Kane, Kendall, DeKalb and Lee counties. Same crew, same pricing, same warranty everywhere we work.
ProSeal Basement Waterproofing is a basement waterproofing company serving Chicago and the surrounding suburbs. Our crews install interior perimeter drain tile at $95 to $160 per linear foot, exterior membrane and footing drains where the wall requires it, sump pumps with battery backup at $2,800 to $4,500 installed, and crawl space encapsulation at $7 to $14 per square foot. A full perimeter system runs $8,000 to $16,000 on most homes, and interior waterproofing carries a lifetime transferable warranty.
What separates a wet basement company worth hiring is what happens before the quote. Roughly half the basements we inspect are solved outside for $600 to $2,500 of downspout and grading work, or a French drain at $45 to $90 per linear foot, and we say so instead of selling a system nobody needs. When you compare basement waterproofing companies in Chicago, get the entry point identified in writing, the warranty terms named, and the price range published before anyone sits at your kitchen table.
Straight answers with real numbers, from the crew that does the work.
How much does it cost to waterproof a basement in Chicago?
Interior drain tile runs $95 to $160 per linear foot. A full-perimeter system on a typical Chicago basement lands between $8,000 and $16,000 with a sump and battery backup. Smaller fixes, like a single wall, one crack, or regrading, cost far less. Every range is published on this site.
Do I need interior drain tile, or is this a gutter problem?
About half the wet basements we inspect start in the yard: short downspouts, settled grading, clogged gutters. That fix runs $600 to $2,500 instead of five figures. The free inspection tells you which problem you actually have, and we price both honestly.
Water is coming up my floor drain. Is that the same thing?
No. Water rising from a floor drain is usually a sewer or storm line backing up, not wall seepage, and it needs different equipment. We'll tell you which trade you need in the first ten minutes of the inspection instead of selling you drain tile for a sewer problem.
Interior or exterior waterproofing: which one do I need?
Most Chicago basements are solved from the inside, because an interior system manages groundwater rather than fighting it. Exterior excavation earns its cost when the wall itself is failing, when the foundation is being dug out for other work anyway, or when finished space inside cannot be disturbed. Exterior French drains run $45 to $90 per linear foot. The inspection tells you which case you are in.
Does waterproofing paint or sealer work?
Not on a wall with hydrostatic pressure behind it. Sealers can slow surface dampness on a dry wall, but water under pressure finds the next weak point and the coating peels. If a contractor offers paint as the fix for standing water, get a second opinion.
How fast can you come out?
Within 48 hours for a standard inspection. If water is standing in your basement right now, we answer 24/7 and prioritize active flooding.
How long does a basement waterproofing job take?
Most interior systems finish in two to four days, depending on how much perimeter is being run and what has to be moved off the walls first. We water-test the system in front of you before the crew leaves.
Is your warranty really transferable if I sell the house?
Yes. The interior waterproofing warranty is lifetime, fully transferable, registered to the address rather than to you. It transfers to the buyer at closing at no cost, and their home inspector can call us to verify it.
How do I choose a basement waterproofing company in Chicago?
Ask three questions: does the warranty transfer to the next owner, is pricing published before a salesperson is in your house, and will they identify the water's entry point in writing instead of quoting a system sight unseen. Whoever you hire should also be licensed, bonded and carrying at least $2,000,000 general liability.
Do you also repair foundation cracks and bowing walls?
Yes. Foundation crack repair runs $450 to $900 per crack, carbon fiber straps $600 to $1,000 per strap, and steel I-beam bracing $900 to $1,500 per beam. Water and structural problems usually arrive together, so the same crew handles both under one written scope.
Have a different question? Call (630) 335-1128 and ask the person who'd actually do the work.
Ready for a basement that stays dry?
One inspection, one written price, one warranty that transfers when you sell. Free, within 48 hours.
Warranty: lifetime, fully transferable
