Foundation waterproofing cost in 2026
Foundation waterproofing costs $3,000 to $18,000 per home job in 2026, and most people pay about $5,000.
What moves the price
- The size of the basement changes how much material and labor is needed.
- Inside work costs less than digging up the outside of the foundation.
- The size of the problem matters, from damp walls to real flooding.
- The type of foundation matters, because poured concrete is usually cheaper to treat than block or stone.
- Where you live changes labor and material prices.
What is included
The price usually covers the waterproofing method chosen, such as coatings, drains, a sump pump or a membrane, plus the labor. Digging on the outside may include putting back soil. Foundation repairs, mold cleanup, permits and new landscaping are often extra.
Cost by basement size (Fixr)
| Basement size | Typical range |
|---|---|
| 500 sq ft | $1,500 to $5,000 |
| 1,000 sq ft | $3,000 to $10,000 |
| 1,500 sq ft | $4,500 to $15,000 |
| 2,000 sq ft | $6,000 to $20,000 |
Average prices in US dollars. Source: Fixr.
Cost by method
| Method | Cost |
|---|---|
| Interior waterproofing (This Old House) | $2,000 to $6,000 |
| Exterior waterproofing (This Old House) | $7,000 to $15,000 |
| Interior waterproofing (HomeGuide) | $6,000 to $12,000 |
| Exterior waterproofing (HomeGuide) | $10,000 to $18,000 |
| Sump pump installed (Fixr) | $600 to $2,500 |
| Epoxy crack injection (Fixr) | $250 to $1,000 per crack |
Average prices in US dollars. Source: Fixr.
Why this costs more in 2026
Labor is the biggest part of most home jobs, and skilled trade pay keeps rising. Many materials and parts are imported, and freight went up after the oil shock that began with the Iran war in February 2026. Steel, copper, aluminum and resin all cost more too, so quotes for foundation waterproofing are higher than they were a few years ago.
Ways to pay less
- Get at least three written quotes that list the method, the total cost and the warranty.
- Fix gutters and downspouts first, so water moves away from the house.
- Do the waterproofing before finishing walls and floors in the basement.
- Act early on small leaks, since small repairs cost much less than big ones.
What price guides say
We checked 3 price guides and read every number on their pages. They do not all measure the same thing, so the ranges on this page come from putting them side by side.
- Fixr: How Much Does It Cost to Waterproof a Basement? [2026 Data]
- This Old House: Basement Waterproofing Cost (2026 Pricing)
- HomeGuide: Basement Waterproofing Cost (2026)
Common questions
How much does this cost in 2026?
Foundation waterproofing costs $3,000 to $18,000 per home job in 2026, and most people pay about $5,000. Most people pay about $5,000 per home job. The low end is $3,000 and the high end is $18,000.
What changes the price the most?
The biggest factors are: The size of the basement changes how much material and labor is needed; Inside work costs less than digging up the outside of the foundation; The size of the problem matters, from damp walls to real flooding.
How can I pay less?
Get at least three written quotes that list the method, the total cost and the warranty. Fix gutters and downspouts first, so water moves away from the house. Do the waterproofing before finishing walls and floors in the basement.
Where do these numbers come from?
From 3 named price guides: Fixr, This Old House, HomeGuide. Each one is linked on this page with the date we read it.
Related costs
Compare prices
Related jobs people check next, with the usual 2026 price.
| Job | Usual price |
|---|---|
| Basement waterproofing cost | $2,500 to $8,200 |
| Foundation inspection cost | $300 to $1,000 |
| Foundation crack repair cost | $200 to $4,000 |
| Foundation repair cost | $2,176 to $7,833 |