Home Services
Basement Waterproofing: What It Costs and What Works
Published September 24, 2026 · Last updated October 1, 2026
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The short answer
Basement waterproofing costs about $5,241 on average, with most homeowners paying $2,461 to $8,202. Interior systems cost less. Exterior waterproofing costs more because it means digging around the foundation.
Before you pay for a full system, check the cheap fixes first. A lot of wet basements start with gutters and grading.
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Try the simple fixes first
Water usually gets into a basement because too much of it collects against the foundation. Before you call a waterproofing company, check:
- Gutters and downspouts. Clean them, and make sure downspouts carry water several feet away from the house. See gutters.
- Grading. The soil should slope away from the foundation, not toward it.
- Window wells. Clear debris, and consider covers.
- Plumbing leaks and condensation. Sometimes the "leak" is a sweating pipe or a dryer vent.
If water still gets in after heavy rain, it's time for a pro.
Interior vs. exterior waterproofing
Interior waterproofing manages water after it reaches the foundation. A common setup is an interior drain (sometimes called a French drain or drain tile) along the edge of the floor that carries water to a sump pump. It costs less because there's no digging outside.
Exterior waterproofing stops water before it reaches the walls. The contractor digs down along the foundation, applies a waterproof coating or membrane, and often adds an exterior drain. It's more effective at keeping walls dry, but costs more because of the excavation.
Crack repair can fix small leaks through specific foundation cracks for much less than a full system.
What basement waterproofing costs
Price range
Basement waterproofing costs about $5,241 on average, with most homeowners paying $2,461 to $8,202. Interior methods cost less than exterior work. Budget separately for related work if needed: water damage repair (about $1,360 to $6,290), mold remediation (about $500 to $3,500), and permits (about $150 to $500).
Not a quote or an offer. Your price comes from the contractor. Source: Angi, 2026.
What moves the number
- The method. Crack sealing < interior drain and sump < exterior excavation.
- Basement size and wall length.
- Foundation type and soil.
- Access. Decks, patios, and landscaping make exterior work harder.
- Related repairs, like mold cleanup or finished walls that have to come out.
Water in the basement and insurance
Homeowners insurance often won't pay for a wet basement:
- Gradual seepage through walls or floors is usually not covered.
- Flooding from outside needs a separate flood policy. See flood insurance.
- Water backing up through a drain or sump pump usually needs a water backup add-on.
A sudden burst pipe is a different story. That's often covered. Ask your insurer what your policy covers before you need it.
What to ask
- "Where is the water coming from?" A good contractor explains the cause, not just the fix.
- "Interior or exterior, and why?"
- "Is a sump pump included? Does it have a battery backup?"
- "What's the warranty, and does it transfer if I sell?"
- "Will this fix the cause, or just manage the water?"
The catch: some waterproofing sales pitches start with a free inspection and a scary quote. Get at least two opinions. If gutters or grading are the real problem, a few hundred dollars may fix what a several-thousand-dollar system would only manage.
Keep reading
Cracks or bowing walls? See foundation repair. Musty smell? See mold remediation.
Protect and repair your home: Foundation repair · Water damage restoration · Mold remediation · Radon testing and mitigation · Pest control · Home inspection · Home security · Home warranty · Is a home warranty worth it? · Chimney repair · All home projects
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