A full interior waterproofing system in a typical Kansas City basement runs
$8,500 to $9,250. Small jobs start around $575. Large or complicated ones reach
$25,750.
But before any of that: a good number of wet basements we look at are fixed outside,
for a few hundred dollars. That section is below, and it is the one worth reading first.
What the pieces cost
| Item | Typical cost |
|---|---|
| Interior drain system, typical basement | $8,500 – $9,250 |
| Interior drain system, small run | from $575 |
| Interior drain system, full perimeter / complex | up to $25,750 |
| Wall shield (vapour barrier to the drain) | $1,525 – $1,650 |
| Sump pump, 3/4 HP with battery backup | $2,750 – $2,975 |
| Sump basin | $1,975 – $2,125 |
| Dedicated power outlet for the pump | $1,125 – $1,225 |
| Downspout extensions | $3,175 – $3,450 |
The battery backup is worth a word. A sump pump keeps a basement dry right up until the
storm takes the power out, which is exactly when it is needed. It is the one upgrade we
would push back on you for skipping.
Try the outside first
Water in a Kansas City basement is a drainage problem before it is a foundation problem,
and the cheapest fixes are almost always outside the house:
- Downspouts discharging too close to the wall. A roof sheds an enormous
volume of water and a downspout concentrates it into one spot. Extending it away from the
house is the single cheapest thing in this guide. - Ground sloping back toward the house. Soil settles over decades,
especially over a backfilled trench. - Beds and mulch against the wall holding water there all summer.
- Window wells with no drainage — a bucket sitting against your basement
window.
If those are all correct and it still comes in, the water is arriving below ground and has
to be managed rather than diverted. That is when
a drain system and
a pump earn their money.
How to find where it actually gets in — the puddle is rarely near the entry point — is
covered in water
in the basement after a storm.
When water is telling you about the structure
The same saturated clay that leaks into your basement also pushes sideways on the wall.
So while you are down there, check whether the wall is still flat and whether any crack runs
horizontally. If it does, you have two things going on and the waterproofing is only
half the answer.
Why we are usually not the cheapest quote
We should say this plainly, because you will notice it anyway. We are generally
toward the top of the market on price in Kansas City. That is a choice about materials and
about how the work is done, not a margin we are hiding.
What we will not do is sell you more than you need. The evaluation tells us how many
piers are actually carrying load and how much of the wall is actually moving, and that
is what gets quoted. A number of the jobs we look at come back smaller than the quote
the homeowner already had in their hand.
You do not have to do it all at once
This is the part most people do not know they can ask for, and it is the thing we get
asked back about most often.
Foundation work can nearly always be broken into stages. If one corner is moving and
the rest of the house is stable, we can do that corner now and leave the rest until it
needs attention — or until you are ready. If the wall needs stabilising but the drainage
is the thing actually causing it, we can fix the drainage first and see whether the wall
settles down before spending on structural work.
Phasing does not usually cost more overall, and it turns a number a lot of households
cannot absorb in one go into something manageable. Ask us to price it in stages. We will.
What the free evaluation actually gets you
Elevation readings across the whole house, a look at every wall that matters, a walk
of the drainage outside, and a plain answer about whether anything has actually moved and
by how much. If it has, you get a written plan and a fixed price before any work starts,
and a lifetime warranty when it is finished. If it has not, you owe us nothing and you
have a baseline to compare against in five years.
Book a free evaluation, or call and we will talk it through
first.
Prices in this guide reflect our September 2026 schedule and were set on 25 August 2026. Foundation work moves with material costs, tariffs, fuel and annual increases — our own prices rose in September 2026 and the figures here already include that. Treat them as a guide to the shape of a job rather than a quote. The only number that means anything for your house is the one we put in writing after measuring it.
