Basement waterproofing cost
The range runs from two downspout extensions to a full excavation. Understanding which end you are at is worth more than any national average.
What is genuinely useful is the structure of the cost, because basement waterproofing spans an enormous range and almost all of the variation is scope rather than regional pricing.
The cost ladder, cheapest first
| Intervention | Effort | Fixes |
|---|---|---|
| Clear gutters, extend downspouts | An afternoon, minimal cost | A surprising share of wet basements |
| Regrade soil away from the wall | A weekend plus some soil | Surface water reaching the foundation |
| Window well covers and drains | An afternoon each | Water entering at basement windows |
| Hydraulic cement on holes and joints | An hour | Discrete active leaks |
| Crack injection kit | Half a day | A weeping crack, permanently |
| Masonry waterproofing coating | A weekend, mostly preparation | Dampness through porous masonry |
| Sump pump and pit (new) | Contractor | Water at the footing with nowhere to go |
| Interior drain tile loop | Contractor, days | Hydrostatic pressure, from inside |
| Exterior excavation and membrane | Contractor, the largest job | Hydrostatic pressure, at the cause |
The jump in cost between the sixth and seventh rows is the biggest one in this table, and it is also where most people are told they need to be. Work down the list in order before accepting that you belong at the bottom of it.
What makes a quote go up
- Linear feet of wall treated. Most interior drainage is priced this way, so partial treatment of the affected walls is often an option worth asking about.
- Access. A finished basement means removing and reinstating finishes. A tight exterior site means hand digging.
- Whether a pump and pit are included. They often are not, and they are not optional.
- Depth. Exterior excavation cost scales sharply with how deep the footing is.
- Restoration. Ask explicitly whether the concrete is patched and the finishes reinstated, or whether that is your problem.
DRYLOK Fast Plug hydraulic cement
Hydraulic cement stops an active leak for the price of a sandwich.
#ad we earn a commission · Amazon shows the current price
| Type | Quick-setting hydraulic cement |
|---|---|
| Set time | 3 to 5 minutes |
| Works under water | Patches holes where water is actively flowing through them |
| Composition | Sand and cement, 100% solids |
| Coverage | 16 cu in per lb |
The bottom of the cost ladder, and genuinely the right answer for a tie-rod hole or a weeping joint.
What it gets right
- Very cheap
- Immediate
- Keeps on a shelf
Where it falls short
- Point repair only
Specifications from DRYLOK Fast Plug product data.
DRYLOK Extreme Masonry Waterproofer
Materials for a whole basement's walls cost less than an hour of most contractors' time.
#ad we earn a commission · Amazon shows the current price
| Type | Latex masonry waterproofer for interior and exterior masonry |
|---|---|
| Hydrostatic resistance | 15 PSI, tested to ASTM D-7088 |
| Coverage | 75 sq ft/gal first coat, 75 to 100 sq ft/gal second coat |
| Film build | 13 to 21 mils wet per coat; 17 mils dry minimum over two coats |
| Mildew | Biocide in the film to resist mildew growth on the dry paint |
| Shelf life | 5 years unopened |
| Warranty | 15 years, fully transferable, per UGL |
Most of the cost here is your weekend, which is exactly why it is the cheap option.
What it gets right
- Covers a lot of wall for the money
- No specialist tools
- Warranted product
Where it falls short
- Labor-intensive preparation
- Bare masonry only
Specifications from DRYLOK Extreme product data sheet, DRYLOK Extreme product page.
Spending in the right order
- Free and cheap first. Gutters, downspouts, grading. Then wait for rain and reassess.
- Point repairs next. Hydraulic cement and crack injection, which are inexpensive and permanent when done properly.
- Coatings after that, if the remaining symptom is dampness rather than pressure.
- A reliable pump and backup before any major structural work. Often this plus the steps above is the whole solution.
- Major drainage work last, and only with a diagnosis you understand and a second opinion.
Questions people ask
How much does it cost to waterproof a basement?
Anywhere from the price of two downspout extensions to a major excavation. The variable is scope, not region, which is why a national average is not useful. Get two local quotes.
Is basement waterproofing worth the money?
The cheap end — gutters, grading, crack repair, a reliable pump — is almost always worth it. The expensive end is worth it when the cheap end has genuinely been exhausted and water is still arriving under pressure.
Can I do basement waterproofing myself?
The exterior drainage corrections, crack repairs and wall coatings, yes. Interior drain tile and exterior excavation are contractor work.
Does waterproofing add home value?
A dry basement with documented work and a maintained pump is a meaningful selling point. Evidence of water with no remediation is the opposite.
Sources
Read next
Interior vs exterior basement waterproofing
One manages water that has reached the wall. The other stops it arriving. They solve different problems and the sales pitch rarely says so.
How to waterproof a basement
Start outside. A startling share of wet basements are fixed with a ladder and an afternoon, and no product at all.
The best basement waterproofing products, by problem
Almost every product in this aisle works. Almost every disappointment comes from using one on a problem it was never designed for.
Sump pump replacement cost
We are not going to invent a national average for you. Here is what the price is actually made of, so you can read a quote properly.
The best basement crack repair kits
A single wet line down a wall is a crack, and a crack has three different fixes depending on whether it is wet, moving, or holding the house up.