Crawl Space Waterproofing in Metro Atlanta
Crawl space waterproofing is the set of systems that intercept water before it reaches the crawl space floor and remove what still gets in, combining exterior grading and downspout correction, interior perimeter drainage, a sealed sump basin with a pump, and wall sealing where hydrostatic pressure is present.
- Typical range
- $3,200 – $12,500
- Unit pricing
- $45–$95 per linear foot of interior perimeter drain
- Time on site
- 2 to 4 days on site
- Permit
- Required
Signs you need waterproofing
- Standing water or mud in the crawl space after rain
- Water lines or staining on the foundation walls and piers
- Efflorescence, the white crystalline deposit, on block walls
- A sump pump that runs constantly or one that never runs at all
- Erosion channels visible in the crawl space soil
Terms you will hear
hydrostatic pressure, perimeter drain, sump basin, check valve, discharge line, washed stone. These come up in every honest quote for this work. A quote that avoids all of them is describing a product rather than a repair.
How waterproofing is done
- 1Trace the water to its actual source with a site inspection during or right after rain where possible
- 2Correct the cheap causes first: gutters, downspout extensions, negative grading, missing splash blocks
- 3Excavate the interior perimeter trench inside the foundation footing line
- 4Install perforated drain pipe in washed stone with filter fabric
- 5Set a sealed sump basin with an appropriately sized pump and a check valve
- 6Route the discharge line to daylight or a storm connection well clear of the foundation
- 7Backfill, install the vapor barrier over the completed system, and test with water
- 8Document flow rate and pump cycling under test
What waterproofing costs
An interior perimeter drain around 110 linear feet with a sealed sump basin, a 1/3 horsepower pump and a discharge line typically runs $6,500 to $10,000 in Metro Atlanta.
| Line item | Low | High | Unit |
|---|---|---|---|
| Interior perimeter drain, perforated pipe in washed stone | $45 | $95 | linear ft |
| Sealed sump basin with 1/3 hp pump and check valve | $1,200 | $2,600 | each |
| Battery backup sump pump | $700 | $1,600 | each |
| Discharge line to daylight, trenched | $18 | $42 | linear ft |
| Exterior downspout extension and splash correction | $120 | $400 | per downspout |
| Exterior regrading at the foundation | $8 | $22 | linear ft |
| Foundation wall crack sealing | $350 | $900 | per crack |
What drives the number
- Linear feet of perimeter drain required
- Whether the soil is Cecil clay, which trenches slowly, or sandy alluvium
- Sump pump capacity, battery backup, and discharge routing distance
- Whether exterior grading and downspout extension can solve part of the problem more cheaply
- Shallow bedrock, which prevents exterior drainage entirely in places like Stone Mountain and Smoke Rise
These ranges are a planning model built for this site, not a survey of what other contractors charge. It has three inputs. Material quantities are taken off a reference 1,400 square foot crawl space with 150 linear feet of foundation wall, priced at Metro Atlanta supplier list rates. Labour hours are costed against Bureau of Labor Statistics wage data for the Atlanta metropolitan area, where the mean hourly wage was $34.57 in May 2025. Permit fees come from the published schedules of the jurisdictions listed on this site. See the detailed cost guide.
When waterproofing is the wrong purchase
If your crawl space is humid but has never held standing water, the problem is vapor and air, not liquid water, and a drainage system will not lower your humidity.
Transparent pricing, published first
Every service page shows line-item ranges and the local factors that move them, before you call. If a quote you receive falls outside them, you have something concrete to ask about.
A written scope before any work starts
Written scope and price before any work starts. Quotes are honored for 30 days.
Response time we hold ourselves to
A crawl space specialist calls back within 60 minutes during posted hours, and by 9:00 AM the next morning for after-hours calls.
Licensing you can verify yourself
Georgia requires contractor licensing above $2,500 in project value. Ask for the number, then check it against the state register yourself. Georgia Secretary of State licence lookup
Crawl Space Waterproofing by city
Dedicated pages, each with that city’s permit office, housing stock and local price factors:
We also cover waterproofing in these cities. Each city hub carries its local conditions and permit path:
Crawl Space Waterproofing: common questions
What is crawl space waterproofing?
Crawl space waterproofing is the set of systems that intercept water before it reaches the crawl space floor and remove what still gets in, combining exterior grading and downspout correction, interior perimeter drainage, a sealed sump basin with a pump, and wall sealing where hydrostatic pressure is present.
How much does waterproofing cost in Metro Atlanta?
An interior perimeter drain around 110 linear feet with a sealed sump basin, a 1/3 horsepower pump and a discharge line typically runs $6,500 to $10,000 in Metro Atlanta. These ranges are a planning model built for this site, not a survey of what other contractors charge.
How long does waterproofing take?
2 to 4 days on site. The schedule extends when a permit and inspection are involved, or when water has to be intercepted before the main work can start.
Do I need a permit for waterproofing in Georgia?
Interior drainage and sump installation usually needs an electrical permit for the pump circuit. Exterior excavation frequently triggers a land disturbance permit, and Norcross specifically requires one.
When is waterproofing the wrong purchase?
If your crawl space is humid but has never held standing water, the problem is vapor and air, not liquid water, and a drainage system will not lower your humidity.
More reading: Crawl Space Encapsulation Problems · Crawl Space Smells Like Cat Pee (And You Have No Cat) · Crawl Space Vents: Open or Closed in Georgia?