On this page
Basement waterproofing averages about $5,000, with most projects between $3,000 and $10,000. Interior drain tile is priced by the linear foot, about $60 to $120 per foot of wall. Surface-water fixes like downspouts, grading and window well drains cost a few hundred dollars; exterior excavation can reach $15,000 to $40,000.
Waterproofing Costs by Method
| Method | Typical cost | Fixes |
|---|---|---|
| Grading correction | $300 – $3,000 | Surface water flowing toward the house |
| Downspout extensions | $50 – $500 | Roof water at the foundation |
| Window well drain repair | $300 – $2,000 per well | Snowmelt leaks at basement windows |
| Window well cover | $100 – $500 per well | Snow and rain filling the well |
| Crack injection | $400 – $1,200 per crack | Leaking shrinkage cracks |
| Interior sealant coating | $500 – $2,500 | Light dampness only |
| Sump pump (existing pit) | $600 – $2,000 | Failed or old pump |
| Interior drain tile + sump | $3,000 – $15,000 | Water at the floor-wall joint |
| Exterior excavation + membrane | $8,000 – $40,000 | Severe or whole-wall leaks |
Crack injection prices and methods are on our foundation crack injection page.
What Your Leak Will Probably Cost to Fix
Start from what you are seeing, not from what a salesperson wants to install. This table matches the most common Eagle Mountain symptoms to the fix that usually solves them.
| What you see | Likely cause | Usual fix | Typical cost |
|---|---|---|---|
| Water at a basement window after snowmelt | Window well drain clogged or missing | Clean or rebuild the well drain; add a cover | $100 – $2,000 |
| Damp lower wall on the sprinkler side | Sprinkler heads spraying the foundation | Adjust heads and zones; regrade the bed | $0 – $500 |
| Wet spot below a downspout | Roof water dumping at the wall | Extend downspouts 6+ feet | $50 – $500 |
| One crack that weeps in spring | Shrinkage crack in poured concrete | Polyurethane crack injection | $400 – $1,200 |
| Water along the floor-wall joint after storms | Saturated soil pressing on the wall | Interior drain tile and sump pump | $3,000 – $8,000 |
| Sweaty walls in summer, no puddles | Condensation, not a leak | Dehumidifier; insulate cold walls | $200 – $2,500 |
| Water through the wall face in heavy rain | Failed exterior damp-proofing | Exterior membrane and footing drain | $8,000 – $15,000+ |
Interior vs. Exterior Waterproofing
Interior systems manage water after it reaches the wall. A crew cuts a trench along the inside of the slab, lays perforated pipe in gravel and runs it to a sump pump. Exterior systems stop water before it touches the wall, but the yard has to be dug down to the footings.
| Interior drain tile + sump | Exterior membrane + footing drain | |
|---|---|---|
| Typical cost | $3,000 – $8,000 | $8,000 – $15,000+ |
| Time on site | 2 – 5 days | 5 – 14 days |
| Disruption | Concrete dust; perimeter drywall removed in finished basements | Yard, landscaping and window wells dug up |
| Best for | Floor-wall seepage and moderate water pressure | Water coming through the wall face |
Why Eagle Mountain Homes Often Pay Less
Most Eagle Mountain basement leaks are seasonal surface water: snowmelt in window wells and sprinkler water against walls, rather than a permanently high water table. Those leaks often stop with grading, downspout and window well fixes that cost a fraction of a drainage system. Many homes here were also built after 2000, so the foundations are poured concrete in decent shape, which keeps crack repairs simple. Diagnose before you buy.
Many local leaks trace back to snowmelt, sprinklers and storm runoff rather than high groundwater.
Waterproofing a Finished Basement
Interior drain tile in a finished basement means removing a strip of drywall, insulation and flooring along every wall it runs past. That adds roughly $1,000 to $3,000 for rebuild. It also opens walls that may have been wet for a long time, which is where mold shows up.
A waterproofing project that opens finished walls often uncovers mold. Make sure the quote says who removes it, how it is contained and what it costs before the first wall comes down.
If water has already reached the pit or you are replacing an old pump, see sump pump installation and battery backups.
How Long Each Fix Lasts
| Fix | Typical lifespan | Upkeep |
|---|---|---|
| Downspout extensions and grading | Until landscaping changes | Check every spring |
| Window well drain and cover | 10 – 20 years | Clear leaves and debris each fall |
| Crack injection | 10 – 20 years | Watch for new cracks nearby |
| Interior sealer or paint | 2 – 5 years | Peels if water is pushing behind it |
| Interior drain tile | 20 – 30 years | Keep the sump pit clean |
| Sump pump | 7 – 10 years | Test twice a year; replace before it fails |
| Exterior membrane | 25+ years | Little once backfilled |
Questions to Ask Before Paying for Waterproofing
- Where exactly is the water coming from, and how was that confirmed?
- Have the outside fixes (grading, downspouts, window wells, sprinklers) been tried?
- Is the system priced per linear foot, and how many feet are included?
- What pump is installed, and is a battery backup included?
- What does the warranty cover, and is it transferable if I sell?
- Does the price include restoring flooring and drywall removed for drain tile?
- What happens to mold found behind the walls during the work?
Compare methods on our basement waterproofing page, and pair it with basement mold removal and waterproofing help if the walls are already moldy.
Frequently Asked Questions
How much does it cost to waterproof a 1,000 sq ft basement?
An interior drain tile and sump system for a typical 1,000 sq ft basement (about 130 feet of wall) costs about $4,500 to $7,500. Surface-water fixes may cost far less.
What is the cheapest way to waterproof a basement?
Fix outside water first: downspout extensions, grading, window well drains and covers, and sprinkler adjustments. Many Utah leaks stop there.
Is interior or exterior waterproofing better?
Exterior stops water before it reaches the wall but costs much more. Interior drain tile manages water that gets in and suits most existing finished basements.
Is waterproof paint enough for a basement?
Only for light dampness. Paint and sealers cannot stop water under pressure; they bubble and peel within a few years if the wall is actively leaking.
How long does basement waterproofing last?
Interior drain tile lasts 20 to 30 years and exterior membranes 25 years or more. Sump pumps need replacing every 7 to 10 years.
