Basement Waterproofing in Lee's Summit, MO

About 7 in 10 homes in Lee’s Summit were built in 1980 or later, and plenty of them sit on rolling lots with a walkout on the low side. That combination decides how water gets into a basement here. Basement waterproofing in Lee’s Summit usually comes down to three things: clay that swells and holds water, a seasonal water table that rises over shallow shale, and builder drain lines that quietly stopped doing their job.

Why Basements Here Take On Water

Most leaks here trace back to the ground and the grade, not the wall.

Clay that holds water. Local soils like Greenton and Sharpsburg are rich in smectite, a clay that swells when wet. Once saturated, it pushes water and pressure against your walls.

A spring water table. Greenton soil holds perched water 1 to 2.5 feet down from November through April. Shale and limestone sit 8 to 13 feet below, so water runs sideways along the rock and into your basement.

Hills and walkouts. On a walkout, the buried uphill wall takes the runoff. That’s why one side often leaks at the cove joint while the rest stays dry.

Clogged builder drains. City permit plans show 4-inch perforated pipe along the footing, draining to daylight or a sump. After 20 or 30 years, those outlets get buried, crushed or silted shut, and water backs up inside.

Big storms. On July 1, 2024, 2 to more than 6 inches of rain hit the south metro, and Lee’s Summit was among the hardest hit. Basements flooded through uncovered window wells and rerouted drain lines.

What We See by Home Age

The city grew in waves, and each wave tends to leak in its own way.

Home era	Where you find it	What we usually see
Before 1960	Downtown and older blocks in 64063	Block or older poured walls, mortar joint seepage, little or no drain tile
1960s to 1980s	Lakewood’s early phases, central neighborhoods	Aging footing drains, cracked walls, failing original sump pumps
1990s to 2000s	Raintree Lake, Winterset Valley, much of 64081 and 64082	Walkouts with uphill wall seepage, buried daylight outlets, window well leaks
2010 and newer	Newer subdivisions across the south and east	Shrinkage cracks, cove joint seepage, grading that settled after construction

About 21% of homes in Lee’s Summit were built in the 1990s and another 21% in the 2000s, so walkout and daylight drain problems are the ones we run into most.

Foundation Waterproofing Options We Install

Good waterproofing for basement problems starts with matching the fix to the source. Here is what we install and when each one makes sense.

Interior Drain Tile

We cut a channel 12 to 16 inches out from the wall along the inside perimeter of the floor, set perforated pipe in clean gravel down at the footing, and carry the water to a sump basin. It relieves the pressure building under and against the walls instead of trying to hold it back. It fits best when water comes in at the cove joint or up through the floor, which is the most common pattern on clay lots. A well-installed system should last 20 years or more.

Sump Pump Installation and Battery Backup

The sump pump is the engine of the system. Most pumps last 10 to 15 years, but manufacturer warranties usually cover only 1 to 3, so we check the age, float switch, check valve and discharge on your current pump before recommending a new one. We run discharge through 1½-inch PVC into 4-inch solid pipe that ends at a catch basin set flush with the yard, well past the city’s 3-foot minimum. In a hard storm, a pump can cycle about 5 minutes every hour, and the power often drops right when the rain is heaviest. That’s why we strongly recommend a battery backup sump pump for finished basements.

Basement Wall Crack Repair

A single leaking crack does not need a full drainage system. We inject it from the inside so water can’t follow the crack through the wall. Epoxy bonds the concrete back together and works best on narrow cracks around ⅛ inch, while flexible polyurethane foam seals cracks that are only leaking. A 25-foot wall usually takes 2 to 3 hours. If a crack is wider than ¼ inch, have it checked for movement before it gets sealed. See our wall crack repair page for more.

Outside Drainage Fixes

Sometimes the cheapest fix is outside. We clear or replace failed daylight outlets, bury downspouts so they discharge at least 6 feet from the house, regrade low spots, and add window well covers. See drainage solutions and gutter installation.

When the Wall Itself Is Moving

A horizontal crack or a wall leaning inward is a structural problem, not just a leak. Waterproofing alone won’t stop it. We brace the wall with steel I-beams or anchor it into the yard with deadman anchors, then handle the water. Learn more about bowing wall repair in Lee’s Summit and wall bracing. If the house is settling, we use concentric push piers in Lee’s Summit driven to load-bearing strata. Our foundation repair in Lee’s Summit page covers that side of the work.

What Basement Waterproofing in Lee's Summit Costs

These are Olson’s current price ranges from our pricing page.

Service	Price range
Interior drain tile	$75 to $90 per foot
Sump pump installation	$1,800 to $2,000
Sump pump with battery backup	$2,400 to $2,600
French drains	$55 to $65 per foot
Curtain drains	$45 to $55 per foot
Epoxy crack injection	$40 to $50 per foot
Epoxy patching	$12 to $18 per foot
Tuck pointing	$15 to $20 per foot

What Moves Your Waterproofing Basement Cost Up or Down

How many walls need drain tile. A walkout’s open wall rarely needs it, so walkouts often cost less than a fully buried basement.
Finished space. Drywall, carpet, and built-ins along the wall have to come out and go back.
Where the sump goes and how far it discharges. The city requires discharge at least 3 feet from the foundation.
Access. Tight furnace rooms, stairs, and stored items add labor.
Battery backup. Adds about $600 over a standard sump.

Example: Drain tile along one 30-foot uphill wall runs $2,250 to $2,700. Add a sump with battery backup at $2,400 to $2,600, and the total lands around $4,650 to $5,300. Your quote depends on your basement. Ask about financing if you’d like to spread it out.

Dealing With a Flooded Basement After a Storm?

Shut off power to the basement if water is near outlets or appliances.
Take photos before you move anything for your insurance claim.
Pull water out with a wet vac or pump and run fans and a dehumidifier until humidity is back under 50%.
Note where the water came in: a crack, the cove joint, a window well or the floor drain.
Call us once it’s safe. Where the water entered tells us most of what we need to know.

If water came up through a floor drain or toilet, that may be a sewer backup. Call the City’s Water Utilities at 816.969.1900 (after hours 816.969.7407).

Lee's Summit Permits and Sump Pump Rules

Discharge distance. The city requires sump pumps and downspouts to discharge at least 3 feet from the foundation, with drains running to daylight.
No sewer connections. Sump pumps, foundation drains, and downspouts can’t tie into the sanitary sewer. The city checks with smoke tests, dye tests, and cameras.
Permits. Development Services (220 SE Green, 816.969.1200) requires a permit to finish a basement. We confirm whether your waterproofing scope needs one before work starts and pull it if it does.
Code. Projects submitted on or after October 1, 2026 fall under the 2024 International Residential Code.

Why Homeowners Choose Olson as Their Basement Waterproofing Company

Since 1986. Olson is family-owned and has worked in the Kansas City metro for 40 years. A warranty is only as good as the company behind it, and we’ll be here when you call.
The person bidding your job has done the work. John Murphy brings 26 years of foundation repair experience: 21 years doing installs and 5 years in sales. When he looks at your basement, he knows what each fix takes to build. On one Olson job, a homeowner expected to pay to relocate a water heater. John knew from years of installs that the repair could be done without moving it, which saved the cost and the disruption.
We fix what is wrong, not the whole house. If only your uphill wall leaks, we may run drain tile on that wall first and see how the basement does through a wet season. You can always add more later. Most homeowners would rather pay for what works.
A clean, careful crew. Many basements here are finished living space. We protect floors, contain dust, and leave the work area clean.
Proven locally. BBB A+ accredited, with a 4.7-star average across 90+ Google reviews. If you’re searching for basement waterproofing near you, we’re based on Blue Ridge Boulevard, about 20 minutes away.
A warranty for each system. Interior drain tile carries a 15-year warranty, and sump pumps and waterproofing membranes carry 5 years. If your basement also needs wall anchors or I-beam bracing, those carry 15 years, adjustable support posts carry 3 years, and piers carry a transferable lifetime warranty. Coverage on other work varies by service, and we put every term in writing before work starts. See what our foundation warranty covers.

How Your Waterproofing Project Works

Contact Us Now

Call (913) 592-3300 or request your free in-home consultation. No charge and no deposit. If water showed up after the last storm, snap a few photos of where it came in; they help us plan the visit.

Get an Assessment

We check the yard first, including buried footing drain outlets, then the basement for stains, cracks, and a wet cove joint. You get a plain-English diagnosis and an itemized bid that includes the smallest fix that should work.

Complete Work

We handle any permit with Lee’s Summit Development Services, protect your finished space, and route sump discharge at least 3 feet from the foundation. Crack injection often takes a few hours, and about 100 feet of drain tile takes roughly 3 days.

Get Peace of Mind

We run water through the system before we leave so you can see it work. You get the warranty walkthrough before the first cut, not in a folder afterward: what each service covers, for how long, and how the coverage transfers if you sell.

Other Olson Services in Lee's Summit

We also serve nearby Raytown, Independence, and Blue Springs. Just west in Grandview, we offer basement waterproofing, foundation repair, push piers, and bowing wall repair.

Basement Waterproofing FAQs for Lee's Summit Homeowners

How much does basement waterproofing cost in Lee's Summit?

Interior drain tile runs $75 to $90 per foot, and a sump pump with battery backup runs $2,400 to $2,600. A single leaking crack can cost a few hundred dollars, while a full perimeter system on a buried basement can reach five figures. Your quote depends on footage, finishes, and where the water enters.

Do I need a permit for basement waterproofing in Lee's Summit?

The city requires a permit to finish a basement, and the scope of waterproofing work can affect whether one is needed. We check with Development Services before starting and pull any permit your job requires.

Can my sump pump drain into the sewer in Lee's Summit?

No. The city prohibits sump pumps, foundation drains, and downspouts from tying into the sanitary sewer and tests for these connections. Discharge has to land at least 3 feet from your foundation.

Why does my basement only leak after heavy rain or in spring?

Local clay soils hold a perched water table close to the surface from late fall through spring. Heavy rain saturates that clay, and water moves sideways along the shale below until it reaches your walls.

Is interior or exterior waterproofing better?

For most clay-soil basements, interior drain tile with a sump pump is the more reliable and affordable choice. Exterior excavation makes sense when the outside is already being dug up or a wall needs rebuilding.

Is a battery backup sump pump worth it?

Yes, especially if your basement is finished. Power often goes out during the same storms that send the most water toward your foundation. Adding one costs about $600 more than a standard sump install.

Does homeowners insurance cover a flooded basement in Missouri?

Standard policies usually exclude groundwater seepage and flooding, and sewer backup often requires a separate endorsement. Check your policy and talk to your agent before you need it.

Does a walkout basement need waterproofing?

Often only on the buried sides. The uphill wall on a walkout takes the most water pressure, so that is usually where drain tile goes.

How long does basement waterproofing take?

Crack injection is usually done in a day. About 25 feet of drain tile takes a day, and a 100-foot run with a sump takes about 3 days.

What warranty comes with basement waterproofing?

Interior drain tile carries a 15-year warranty, and sump pumps and waterproofing membranes carry 5 years. If structural work is part of the job, wall anchors and I-beams carry 15 years, adjustable posts carry 3 years, and piers carry a lifetime warranty that transfers if you sell.

Ready for a Dry Basement?

A wet basement rarely fixes itself, and clay soil makes it worse every spring. Call (913) 592-3300 to schedule your free inspection for basement waterproofing in Lee’s Summit.