Basement Waterproofing Cost
Normal range: $2,460 – $8,205
The normal range reported by Angi, updated Oct 16, 2026. It is typical, not a limit: Angi's own high is $15,000 and exterior excavation runs higher.
Reviewed October 27, 2026 · Every claim sourced, listed at the bottom
At a glance
- Angi reports a normal range of $2,460 to $8,205, with interior systems averaging $3,000 and exterior $7,000.
- HomeGuide prices interior at $6,000 to $12,000 and exterior at $10,000 to $18,000, so the guides disagree on the same job.
- Sump pumps are listed from $490 to $2,500 and crack injection from $250 to $1,500, depending on the source.
- Standard homeowners policies generally exclude flood and foundation seepage, according to a 2023 Texas Real Estate Research Center article.
Typical total, by source
Ranges as published; not averaged. Several sources share data, so they do not confirm each other. Every project is different. These ranges are not a quote.
On this page
Basement waterproofing prices vary more than most home repairs, because “waterproofing” can mean a $250 crack injection or an excavation around the whole house. This page shows what each source says, with the date we checked it, where they disagree, and what to look at when you have real bids in hand.
It is background for reading bids, not a price for your basement. Every project is different. These ranges are not a quote.
Yes Home Pros is a directory. We do not waterproof basements, and paid placement never changes a rating or badge. See how we list and rank pros. For why basements leak and how each approach works, read the basement waterproofing guide.
The headline range, and who is saying it
| Source | Typical total | Date checked | Note |
|---|---|---|---|
| Angi | Normal range $2,460 to $8,205; average $5,245; low $600, high $15,000 | Updated Oct 16, 2026 | Says it is based on 5,780 Angi Pro projects. Angi is a lead-generation business. Called “the lead-generation guide” below. |
| Fixr | $3,000 to $10,000; average about $5,000; $3 to $10 per sq ft | Feb 6, 2026 | Read directly. |
| Bob Vila | $2,300 to $7,575; average $4,920 | Article Jun 14, 2024 | Combines data from other sites, with a chart dated March 2023, so it is not independent. |
| HomeGuide | Interior $6,000 to $12,000; exterior $10,000 to $18,000 | Jan 23, 2026 | Priced by approach, not as one range. |
| This Old House | Average $13,640 for 1,000 sq ft ($12,447 to $14,833) | Mar 4, 2026 | Priced by size. Says its data comes from Homewyse and the lead-generation guide. About 2.5 times the lead-generation guide’s average; we do not know why. |
These are aggregators, not government or university data, and several of them draw on the same underlying sites. Agreement among them is not independent confirmation, and the one that disagrees most uses a different unit.
None of them says how many of its projects were interior systems and how many were exterior excavations, and that mix moves the average more than anything else.
Prices by type of work
Guides break the total into pieces. These are the ranges we found, by source. They are not additive and many jobs involve only one or two of them.
| Work | Range reported | Source |
|---|---|---|
| Interior system, average | $3,000 (range $2,000 to $6,000 at This Old House) | Lead-gen guide; This Old House |
| Exterior waterproofing, average | $7,000 (range $7,000 to $15,000 at This Old House) | Lead-gen guide; This Old House |
| Interior and exterior together | $8,000 to $18,000 | This Old House |
| Interior sealing | $200 to $3,000 | Bob Vila |
| Exterior, other range | $1,000 to $15,000 | Bob Vila |
| Sump pump installed | $600 (HomeGuide); $490 to $1,170 (Bob Vila); $1,200 to $2,500 (lead-gen guide, This Old House) | As listed |
| Epoxy crack injection | $250 to $1,000 (Fixr); $250 to $800 or more (HomeGuide); $800 to $1,500 (lead-gen guide, This Old House) | As listed |
| Exterior French drain, per linear foot | $10 to $100 | Lead-gen guide; Fixr; This Old House |
| Subfloor drain, per sq ft | $25 to $55 | Bob Vila |
| Permits | $150 to $500 | Lead-gen guide |
This Old House lists labor at about $200 an hour. Building Science Corporation, a building-science firm, favors controlling water on the outside of the wall, while interior systems relieve pressure under the floor and cost less on average in the guides above. That does not make one right for every house. It depends on the cause, access and budget.
What changes the price
Where the sources disagree
- Totals. Normal range tops out at $7,575 in one guide and $10,000 in another. The per-size figure is $12,447 to $14,833.
- Interior. the lead-generation guide’s average is $3,000; HomeGuide’s range is $6,000 to $12,000.
- Exterior. the lead-generation guide’s average is $7,000; HomeGuide’s range is $10,000 to $18,000.
- Sump pump. $490 to $2,500 depending on whether the pump or the installed system is being priced.
- Crack injection. $250 at the low end to $1,500 at the high end.
We do not average these. An average of different approaches is not a number you can use.
How to compare the bids you get
Get several written estimates and ask why they differ, as the FTC advises. The FTC lists door-knocking, pressure to decide on the spot, full or cash payment up front, asking you to pull your own permits and contractor-arranged loans as warning signs. Questions that make bids comparable:
- How does water enter, and how did the contractor confirm it?
- Is a structural cause possible, and has an engineer looked?
- Is the scope itemized, including drainage, the sump pump, power, permits and cleanup?
- What is the plan if the power goes out?
- What does the warranty cover, is it transferable, and what voids it?
- Are license and insurance current where required?
- What are the payment terms? Avoid paying everything in advance.
Standard homeowners policies generally exclude flood, and the Texas Real Estate Research Center reported in 2023 that they exclude foundation seepage and sewer backup unless you buy an endorsement. A repair that prevents future water is generally not a covered repair, so read your policy and ask your agent before assuming anything is covered.
Sources
Show the 8 sources for this page
- Angi, basement waterproofing cost guide (updated Oct 16, 2026): angi.com
- Fixr, basement waterproofing cost guide (Feb 6, 2026): fixr.com
- Bob Vila, basement waterproofing cost guide (Jun 14, 2024): bobvila.com
- HomeGuide, basement waterproofing cost guide (Jan 23, 2026): homeguide.com
- This Old House, “Basement Waterproofing Cost” (Mar 4, 2026): thisoldhouse.com
- Building Science Corporation, BSD-103 “Understanding Basements” (2006): buildingscience.com
- Federal Trade Commission, “How to Avoid a Home Improvement Scam” (Jul 2022): consumer.ftc.gov
- Texas Real Estate Research Center, “Come Rain or High Water” (May 16, 2023): trerc.tamu.edu
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Basement Waterproofing FAQs
Interior costs less on average in the sources above: $3,000 against $7,000 in the lead-generation guide. Cost is only one factor, so ask each contractor why they recommend their approach.
Both appear. Fixr and This Old House price by size; Lead-gen guide and HomeGuide give totals. Ask each contractor for the total, the length of wall and what is included.
It may skip drainage, use a smaller pump, cover less wall or address only the symptom. Ask what is different, in writing.
No. Use them to spot a bid far outside the published ranges, then ask why.