Greater St. Louis · Crawlspace Medic of St. Louis
Basement Waterproofing in St. Louis, MO
Basement waterproofing and crawl space moisture control for homes across Greater St. Louis.
Book a Free Inspection
A specialist will call you back to schedule.
- Free Inspection & Estimate
- Financing Available
- Basements & Crawl Spaces
- Missouri & Metro East Coverage
- Anti-Fungal Fumigation Crews
- No-Pressure Recommendations
By the Numbers
Why sealing a crawl space pays off
~40% → <6%
85% decrease in untreated first floor air coming from the crawl space
25 yr
Material guarantee on our 10-mil vapor barrier
~15%/yr
Heating & cooling costs saved once a crawl space is sealed
$5k–$10k
What a typical Crawlspace Medic job runs
Your crawl space isn't sealed off from the rest of your home. It's the air you breathe.
Warm air rising through the house pulls air up out of the crawl space with it. When that space stays damp, St. Louis homeowners feel it upstairs: musty air, sticky rooms, and higher power bills.
For wet basements and damp crawl spaces
We chase the water, not the sale.
St. Louis homeowners mostly search for basement waterproofing, and we do that work. We are also crawl space specialists, and the two are usually one problem wearing different clothes: water reaching the lowest point of the house with nowhere to go. Whichever kind of space sits under your floor, the job is to give that water a controlled exit.
Crawlspace Medic of St. Louis covers the Missouri suburbs and the Illinois Metro East from our office on Exchange Way. Every project starts with a free inspection, because a sump pump in the wrong corner, or a barrier laid over standing water, is money spent on the symptom instead of the source.
Five things, done well.
Our crawl space services in St. Louis
What St. Louis Homeowners Say
Customer Reviews, in their words.
“Rarely do I post a review but I wanted to do so because I was so impressed with this company. Noticed some discoloring on a basement wall and feared the worst, especially because it happened so suddenly. Crawl Space Medic came out within just a few days and explained that it wasn’t a crack or a foundational issue but simply needed a few small DIYS remedies. They also inspected my sump pump and walked around the exterior of my home just in case. I’m so appreciative of this company and Blake because they could have chosen to lie and sell me a solution I didn’t need but instead told me the truth which in turn led me to not spending money. That kind of honesty leads me to believe they’d be a great contractor and worth your business. Give them a call!”
“I had such a great experience with Crawlspace Medic. I was initially going through another company but decided to do a second opinion and I’m glad I did. From the beginning to the end Tony was awesome. He came out did an inspection and found things that the other company missed in my first inspection.Tony went above and beyond to make sure the job was done and kept me informed every step of the way. Everyone that came out was nice and very respectful of my time and space. I highly recommend Crawlspace Medic. If I had to rate on a 1 to 10 scale, I would give them a 12.”
“Had a tough crawlspace to work with, but the team came out and made it happen! Tim was the first to answer and stopped by on the exact same day I called for an inspection, and we stayed in frequent contact the entire time. Blake led the charge and put in serious work across two days, with Kris also there on the first day, and Jake on the second. It’s been less than a week and the humidity in the house has already started to drop even with all the rain! The musty, earthy air that was lingering in the house has disappeared. Kudos to all four of them!”
Communities We Serve
Proudly serving St. Louis and the surrounding area
- Chesterfield
- St. Charles
- Wildwood
- O'Fallon
- Belleville
- Granite City
- Columbia
- Mascoutah
- Central West End
- South County
- & Surrounding Areas!
Get the water question answered for free.
Reach Crawlspace Medic of St. Louis
One inspection covers basement and crawl space alike, with photos and readings you keep either way.
Crawlspace Medic of St. Louis
8204 Exchange Way, St. Louis, MO 63144
Mon–Sat 8:00 AM – 6:30 PM · Sun: Closed
Service area: Chesterfield · St. Charles · Wildwood · O'Fallon · Belleville · Granite City · Columbia · Mascoutah · Central West End · South County
How It Works
Simple, and on your terms.
Free inspection
We come out, crawl the space, and photograph what is actually down there. No charge, and no pressure to buy anything.
A report you keep
You get a photo-documented report and a straight diagnosis of your St. Louis crawl space. You decide what happens next.
We fix the cause
We seal and dry the space and repair the damage, built around your home and your soil, not a one-size box.
How water gets out of a house
Drainage is a path, not a product.
Waterproofing that lasts is plumbing for the ground: you accept that water arrives and you give it somewhere better to go. The proven answer is a traditional French drain, a perforated pipe bedded in gravel along the low perimeter, collecting water before it can spread and carrying it to a sump pump that lifts it out of the house.
Order matters. Bulk water leaves through the drain and pump first, then the ground gets covered, then a dehumidifier handles what remains in the air. Skip a step and the moisture finds the gap. The sequence is the same whether the space under your floor is a full basement in the city or a crawl space across the river.
The Science, in One Picture
How moisture moves from the soil into your air
Effects of elevated moisture
- Mold growth
- Insect infestation
- Poor air quality
- Structural damage
Not sure what's going on under your house?
It costs you nothing to have an inspection. We show you exactly what we find, then you decide.
What we bring to the job
One crew for the basement and the crawl space.
Because we work under both kinds of homes, you do not need two contractors to sort out one water problem. Our drains are pipe and gravel rather than a proprietary gimmick, our sump pumps are sized to the space, and our vapor barriers come in 10-mil and 20-mil weights, with the 10-mil Class 1 liner backed by a 25-year warranty. Dehumidifiers are Santa Fe, including the Compact 70 with its 6-year manufacturer warranty, or Aprilaire.
Pricing runs on a band we publish brand-wide instead of a number we invent per city. The bottom of the market covers a floor in thin plastic for $1,000 to $2,000. The top of it, the national foundation chains, bills $15,000 to $30,000. Most Crawlspace Medic jobs land in the middle at $5,000 to $10,000, and the free inspection is what places yours.
Around St. Louis the work we log most is anti-fungal fumigation treatment, 10-mil ground vapor barrier, and insulation removal.
Pricing, compared.
How our price stacks up against the rest.
Cut-rate crews
$1,000–$2,000
A loose sheet of plastic over the problem. Fails, then gets redone on top of the damage it let happen.
Crawlspace Medic
$5,000–$10,000
The honest middle: real materials, sealed and dried, done right the first time.
National foundation chains
$15,000–$30,000
The same scope, plus the markup for a full, white-labeled system.
That $5,000–$10,000 band is where most encapsulation jobs land, not a cap. Larger crawl spaces, structural repair, or a full restoration run higher: a complete restoration on a bigger home can reach $15,000 or more. Your exact price comes from the inspection, based on size, access, and what the crawl space actually needs.
Free water inspection
First we find the entry point.
Water always leaves a trail, and the inspection follows it: where it enters, where it pools, and what it has already touched. We photograph the evidence and take moisture readings so the estimate argues from facts. And when the honest answer is a gutter fix or a regraded downspout instead of a drainage system, that is the answer you will get.
What We Measure
Where your framing falls on the moisture scale
12–16% is safe. Once framing crosses 20%, active decay becomes likely, and the report shows you exactly where yours reads.
A damp crawl space doesn't stay a crawl space problem. It becomes a whole-home one.
Cupping floors, that musty smell, and rising power bills usually trace back to the same place. The good news: it's fixable, and the sooner it's caught, the less there is to undo.
What we will not sell you
A drainage system you do not need is the most profitable thing a waterproofing company can sell, which is exactly why we begin with a free inspection instead of a pitch. We also stay out of full-service foundation work: no push piers, no helical piers, no slab leveling. Cracks that mean the foundation itself is moving get named honestly and referred to a structural contractor who does that work every day.
Common Questions
St. Louis crawl space questions, answered.
Do you do foundation repair?
We waterproof basements, but we are not a foundation repair company. Push piers, helical piers, and slab leveling are not services we offer at any price. Where our repair work applies is the wood structure over a crawl space: joists, sill plates, and subfloor. If the inspection points to movement in the foundation itself, we will say exactly that and hand you to a specialist who handles structural work every day.
Do you work on basements, crawl spaces, or both?
Both, and often on the same street. The waterproofing toolkit is shared: French drains of pipe and gravel, sump pumps sized to the space, vapor barriers, and Santa Fe or Aprilaire dehumidifiers. What changes is the layout of the space, which is why the free inspection comes first. One visit tells you what your basement or crawl space needs, and one crew handles it from there.
Do you cover the Illinois side of the river?
Yes. Our office sits on Exchange Way on the Missouri side, and the service territory runs across the river into the Metro East, including Belleville, Granite City, Columbia, and Mascoutah. On the Missouri side we cover Chesterfield, St. Charles, Wildwood, O'Fallon, and the communities around them. If you are anywhere in Greater St. Louis, call (314) 887-5001 and we will confirm your address.
What does basement waterproofing cost?
We give you the market band rather than a made-up local average. Thin-plastic patch jobs run $1,000 to $2,000 and rarely hold. National chains commonly quote $15,000 to $30,000 for the same square footage. A typical Crawlspace Medic project lands between $5,000 and $10,000. The free inspection settles where yours falls, because entry points, footage, and standing water drive the price.
How does your drainage system actually work?
It is a traditional French drain: perforated pipe set in a gravel bed along the low side of the space, where arriving water collects before it can spread. The pipe carries that water to a sump pump, and the pump lifts it out of the house. No proprietary hardware, no mystery. It is the method the trade has trusted for decades, installed and photographed so you can see every foot of it.
The Difference, Under the House
What the work actually looks like.
Sealed
Crawlspace Medic Near St. Louis
We also serve nearby communities.
Find out what your crawl space actually needs.
We inspect, photograph what we find, and give you a written report you keep, whether or not you choose us. If St. Louis homeowners only need part of the work, we say so.